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Emerson Rosemount Analytical HART 5081-A-HT Instruction Manual

Two-wire chlorine, dissolved oxygen, and ozone transmitter
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Instruction Manual
LIQ_MAN_5081A-HT/rev.M
January 2015
Model 5081-A-HT
HART
Two-Wire Chlorine, Dissolved Oxygen, and Ozone
®
Transmitter
Table of Contents
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Summary of Contents for Emerson Rosemount Analytical HART 5081-A-HT

  • Page 1 Instruction Manual LIQ_MAN_5081A-HT/rev.M January 2015 Model 5081-A-HT HART Two-Wire Chlorine, Dissolved Oxygen, and Ozone ® Transmitter...
  • Page 2 Rev. Level Date Notes 1/03 This is the initial release of the product manual. The manual has been reformatted to reflect the Emerson documentation style and updated to reflect any changes in the product offering. 4/03 Specs updates. 6/03 Agency certification update.

  • Page 3: Table Of Contents

    MODEL 5081-A TABLE OF CONTENTS MODEL 5081-A MICROPROCESSOR TRANSMITTER TABLE OF CONTENTS Section Title Page DESCRIPTION AND SPECIFICATIONS ..............Features and Applications..................Specifications - General................... Specifications - Oxygen ................... Specifications - Free Chlorine.................. Specifications - Total Chlorine.................. Specifications - Ozone ..................... Specifications - Percent Oxygen in Gas ..............
  • Page 4 MODEL 5081-A TABLE OF CONTENTS TABLE OF CONTENTS CONT’D Section Title Page PROGRAMMING (continued) ................Display ........................Factory Default......................HART ........................Calibration SetUp..................... Line Frequency ......................7.10 pH Measurement ..................... 7.11 Barometric Pressure ....................CALIBRATION — TEMPERATURE................ Introduction ......................Procedure ........................ CALIBRATION —...
  • Page 5 MODEL 5081-A TABLE OF CONTENTS TABLE OF CONTENTS CONT’D Section Title Page 14.0 CALIBRATION — CURRENT OUTPUT ..............14.1 General ........................14.2 Procedure ........................ 15.0 DIAGNOSTICS ......................15.1 General ........................15.2 Diagnostic Messages for Dissolved Oxygen............15.3 Diagnostic Messages for Ozone and Total Chlorine ..........15.4 Diagnostic Messages for Free Chlorined..............
  • Page 6 MODEL 5081-A TABLE OF CONTENTS LIST OF FIGURES Number Title Page Transmitter Display During Calibration and Programming ........Infrared Remote Controller..................HART Communication....................Model 5081-A Mounting and Dimensional Drawings..........Mounting the Model 5081-A on a Flat Surface ............Using the Pipe Mounting Kit to attach the Model 5081-A to a pipe ......Load/Power Supply Requirements................

  • Page 7: Description And Specifications

    MODEL 5081-A SECTION 1.0 DESCRIPTION AND SPECIFICATIONS SECTION 1.0 DESCRIPTION AND SPECIFICATIONS • MEASURES dissolved oxygen (ppm and ppb level), free chlo- rine, total chlorine, and ozone. • SECOND INPUT FOR pH SENSOR ALLOWS AUTOMATIC pH CORRECTION for free chlorine measurement. No expensive reagents needed.

  • Page 8: Specifications - General

    MODEL 5081-A SECTION 1.0 DESCRIPTION AND SPECIFICATIONS 1.2 SPECIFICATIONS - GENERAL Housing: Cast aluminum with epoxy coating. Type 4X (IP65). Neoprene O-ring cover seals. 160.5 mm x 175.3 mm x 161.3 mm (6.3 in. x 6.9 in. x 6.4 in.) Conduit Openings: ¾-in.

  • Page 9: Specifications - Oxygen

    MODEL 5081-A SECTION 1.0 DESCRIPTION AND SPECIFICATIONS Explosion-Proof: Repeatability: ±0.01 pH at 25°C Class I, Div. 1, Groups B-D RECOMMENDED SENSOR — pH Class II, Div. 1, Groups E-G Use Model 399-09-62, 399-14, or 399VP-09. Class III, Div. 1 See pH sensor product data sheet for complete order- ing information.

  • Page 10: Transmitter Display During Calibration And Programming

    MODEL 5081-A SECTION 1.0 DESCRIPTION AND SPECIFICATIONS 1.7 TRANSMITTER DISPLAy DURING CALI- BRATION AND PROGRAMMING (Figure 1-1) 1. Continuous display of oxygen, chlorine, or ozone read- ing. © 2. Units: ppm, ppb, or % saturation. 3. Current menu appears here. 4.

  • Page 11: Model 5081-A Mounting And Dimensional Drawings

    MODEL 5081-A SECTION 1.0 DESCRIPTION AND SPECIFICATIONS MILLIMETER INCH FIGURE 1-4. MODEL 5081-A MOUNTING AND DIMENSIONAL DRAWINGS...

  • Page 12: Ordering Information

    MODEL 5081-A SECTION 1.0 DESCRIPTION AND SPECIFICATIONS 1.10 ORDERING INFORMATION The Model 5081-A Transmitter is intended for the determination of oxygen (ppm and ppb level), free chlorine, total chlorine, and ozone. For free chlorine measurements, which often require continuous pH correction, a sec- ond input for a pH sensor is available.

  • Page 13: Installation

    MODEL 5081-A SECTION 2.0 INSTALLATION SECTION 2.0 INSTALLATION 2.1 Unpacking and inspection 2.2 Orienting the display board 2.3 Installation 2.4 Power supply/current loop 2.1 UNPACKING AND INSPECTION Inspect the shipping container. If it is damaged, contact the shipper immediately for instructions. Save the box. If there is no apparent damage, remove the transmitter.

  • Page 14: Mounting The Model 5081-A On A Flat Surface

    MODEL 5081-A SECTION 2.0 INSTALLATION 2.3.2 Mounting on a flat surface. INCH MILLIMETER FIGURE 2-1. Mounting the Model 5081-A on a flat surface...
  • Page 15 MODEL 5081-A SECTION 2.0 INSTALLATION 2.3.3 Pipe Mounting. MILLIMETER INCH DWG. NO. REV. 40508104 DWG. NO. REV. 40508103 FIGURE 2-2. Using the pipe mounting kit (PN 2002577) to attach the Model 5081-A to a pipe.

  • Page 16: Power Supply/Current Loop

    MODEL 5081-A SECTION 2.0 INSTALLATION 2.4 POWER SUPPLy/CURRENT LOOP 2.4.1 Power Supply and Load Requirements. Refer to Figure 2-3. The supply voltage must be at least 12.0 Vdc at the trans- mitter terminals. The power supply must be able to cover the voltage drop on the cable as well as the load resistor (250 W minimum) required for HART communications.

  • Page 17: Wiring

    MODEL 5081-A SECTION 3.0 SENSOR WIRING SECTION 3.0 SENSOR WIRING Wiring Model 499A oxygen, chlorine, and ozone sensors Wiring Model 499ACL-01 (free chlorine) and pH sensors NOTE The Model 5081-A transmitter leaves the factory configured for use with the Model 499ADO sen- sor (ppm dissolved oxygen).

  • Page 18: Wiring Model 499Acl-01 (Free Chlorine) Sensors And Ph Sensors

    MODEL 5081-A SECTION 3.0 SENSOR WIRING 3.2 WIRING MODEL 499ACL-01 (Free Chlorine) SENSORS AND pH SENSORS If free chlorine is being measured and the pH of the liquid varies more than 0.2 pH unit, a continuous correction for pH must be applied to the chlorine reading. Therefore, a pH sensor must be wired to the transmitter. This section gives wiring diagrams for the pH sensors typically used.

  • Page 19: Free Chlorine Sensor With Standard Cable And 399-09-62 Ph Sensor Without

    MODEL 5081-A SECTION 3.0 SENSOR WIRING FIGURE 3-6. Free chlorine sensor with optimum FIGURE 3-5. Free chlorine sensor with standard EMI/RFI cable or variopol cable and 399vP-09 pH cable and 399-09-62 pH sensor without internal sensor without internal preamplifier. preamplifier. FIGURE 3-7.

  • Page 20: Wiring Model Hx438 And Gx448 Sensors

    MODEL 5081-A SECTION 3.0 SENSOR WIRING 3.3 WIRING Hx438 AND Gx448 SENSORS FIGURE 3-9. Hx438 and Gx448 Sensors.

  • Page 21: Intrinsically Safe And Explosion Proof Installations

    MODEL 5081-A SECTION 4.0 INTRINSICALLy SAFE & ExPLOSION PROOF INSTALLATIONS SECTION 4.0 INTRINSICALLy SAFE & ExPLOSION PROOF INSTALLATIONS...
  • Page 23 1400195...
  • Page 24 1400195...
  • Page 28 9241473-00...

  • Page 29: Display And Operation

    MODEL 5081-A SECTION 5.0 DISPLAy AND OPERATION SECTION 5.0 DISPLAy AND OPERATION Display Screens Infrared Remote Controller (IRC) - Key Functions Menu Tree Diagnostic Messages Security Using Hold 5.1 DISPLAy SCREENS Figure 5-1 shows the process display screen. Figure 5-2 shows the program display screen. Concentration of oxygen, ozone, or chlorine Transmitter output signal in...

  • Page 30: Infrared Remote Controller (Irc) - Key Functions

    MODEL 5081-A SECTION 5.0 DISPLAy AND OPERATION 5.2 INFRARED REMOTE CONTROLLER (IRC) - KEy FUNCTIONS The infrared remote controller is used to calibrate and program the transmitter and to display diagnostic mes- sages. See Figure 5-3 for a description of the function of the keys. Hold the IRC within 6 feet of the transmitter, and not more than 15 degrees from the center of the display window.

  • Page 31: Menu Tree

    MODEL 5081-A SECTION 5.0 DISPLAy AND OPERATION 5.3 MENU TREE The Model 5081-A transmitter has three menus: CALIBRATE, PROGRAM, and DIAGNOSE. Under the Calibrate and Program menus are several submenus. Under each submenu are a number of prompts. The DIAGNOSE menu shows the reader diagnostic variables that are useful in troubleshooting.

  • Page 32: Menu Tree

    MODEL 5081-A SECTION 5.0 DISPLAy AND OPERATION FIGURE 5-4. Menu Tree...

  • Page 33: Operation With Model 275, 375, Or 475

    MODEL 5081-A SECTION 6.0 OPERATION WITH 275/375/475 SECTION 6.0 OPERATION WITH 275/375/475 Note on 275/375/475 HART Communicator Connecting the HART Communicator Operation Note on 275/375/475 HART Communicator The 275/375/475 HART Communicator is a product of Rosemount Measurement. This section contains selected information on using the 275/375/475 with the Rosemount Analytical Model 5081-A Transmitter.

  • Page 34: Operation

    MODEL 5081-A SECTION 6.0 OPERATION WITH 275/375/475 Operation 6.3.1 Off-line and On-line Operation The 275/375/475 Communicator features off-line and on-line communications. On-line means the communicator is connected to the transmitter in the usual fashion. While the communicator is on line, the operator can view meas- urement data, change program settings, and read diagnostic messages.

  • Page 35: Menu Tree (Hart)

    MODEL 5081-A SECTION 6.0 OPERATION WITH 275/375/475 -------------------------------------------------------------------------------- 5081A 275 Menu Tree -------------------------------------------------------------------------------- Device setup Process variables view Fld Dev vars Oxygen * Temp Snsr Cur pH # pH mv # GI # Temp Res view Pv-Analog 1 Pv is Oxygen * Pv % rnge Pv AO view Sv...
  • Page 36 MODEL 5081-A SECTION 6.0 OPERATION WITH 275/375/475 Diagnostic vars Oxygen Snsr Cur Sensitivity zero Current pH value # pH mv # pH Slope # pH zero Offset # GI # Temp Temp Res Noise rejection Basic setup Pv Range values Pv LRv Pv URv Pv % rnge...
  • Page 37 MODEL 5081-A SECTION 6.0 OPERATION WITH 275/375/475 pH # pH value pH Comp [Auto, Manual] Manual pH Preamp loc [Sensor, xmtr] Autocal [Manual, Standard, DIN 19267, Ingold, Merck] pH Slope pH SST pH SSS pH zero Offset Limit pH Diagnostics Diagnostics [Off, On] Imped Comp [Off, On] Temperature...
  • Page 38 MODEL 5081-A SECTION 6.0 OPERATION WITH 275/375/475 Device information Distributor Model Dev id Date Write protect Snsr text Descriptor Message Revision #'s Universal rev Fld dev rev Software rev Hardware rev Local Display AO LOI Units [mA, %] xmtr ID Noise rejection Load Default Conf.

  • Page 39: Programming

    MODEL 5081-A SECTION 7.0 PROGRAMMING SECTION 7.0 PROGRAMMING General Default Settings Output Ranging Temperature Settings Display Factory Default HART Calibration Setup Line Frequency 7.10 pH Measurement 7.11 Barometric Pressure 7.1 GENERAL This section describes how to do the following: 1. assign values to the 4 and 20 mA outputs 2.
  • Page 40 MODEL 5081-A SECTION 7.0 PROGRAMMING TABLE 7-1. Default Settings ITEM MNEMONIC CHOICES DEFAULT A. Outputs OutPut 1. 4 mA setting if oxygen (ppm) -9999 to 9999 ppm 00.00 ppm if oxygen (ppb) -9999 to 9999 ppb 000.0 ppb if oxygen (% saturation) -9999 to 9999 % 00.00 ppm if chlorine or ozone...

  • Page 41: Output Ranging

    MODEL 5081-A SECTION 7.0 PROGRAMMING TABLE 7-1. Default Settings (continued) a. reference offset rOFFSEt 0 to 999 b. diagnostics diAG on or off (1) glass impedance temperature IMPtC on or off correction (2) glass impedance high 1000 MW 0 to 2000 MW (3) glass impedance low 0 to 900 MW 10 MW...
  • Page 42 MODEL 5081-A SECTION 7.0 PROGRAMMING 7.3.3 Procedure PROGRAM OutPut 1. Press PROG on the remote controller. The OutPut submenu appears. EXIT NEXT ENTER PROGRAM 2. Press ENTER. The screen displays the 4 MA prompt. Use the arrow keys to change 00 .

  • Page 43: Temperature Settings

    MODEL 5081-A SECTION 7.0 PROGRAMMING 7.4 TEMPERATURE SETTINGS 7.4.1 Purpose This section describes how to do the following: 1. Enable and disable automatic temperature compensation 2. Set a manual temperature compensation value for oxygen, chlorine, ozone, and pH measurements 3. Tell the transmitter the type of temperature element in the sensor 7.4.2 Definitions 1.
  • Page 44 MODEL 5081-A SECTION 7.0 PROGRAMMING 7.4.3 Procedure 1. Press PROG on the remote controller. PROGRAM tEMP 2. Press NEXT until the tEMP submenu appears. Press ENTER. EXIT NEXT ENTER PROGRAM 3. The screen displays the tAUtO (automatic temperature compensation) prompt. tAUtO Press é...

  • Page 45: Display

    MODEL 5081-A SECTION 7.0 PROGRAMMING 7.5 DISPLAy 7.5.1 Purpose This section describes how to do the following: 1. Configure the transmitter to measure oxygen, free chlorine, total chlorine, or ozone 2. Choose concentration units 3. Set the temperature units to °C or °F 4.
  • Page 46 MODEL 5081-A SECTION 7.0 PROGRAMMING 6. For best results make the following settings based on the sensor being used. Sensor Units 499ADO ppm or % 499ATrDO Gx448 ppm or % Hx438 ppm or % PROGRAM 7. If you chose O3 in step 3, the screen at left appears. Press é or ê to toggle between Unit ppm and ppb.

  • Page 47: Factory Default

    MODEL 5081-A SECTION 7.0 PROGRAMMING 7.6 FACTORy DEFAULT 7.6.1 Purpose This section describes how to erase ALL user-defined configuration settings and return the transmitter to factory default settings. 7.6.2 Procedure 1. Press PROG on the remote controller. PROGRAM dISPLAY 2. Press NEXT until the dEFAULt appears in the display. Press ENTER. EXIT NEXT ENTER...

  • Page 48: Calibration Setup

    MODEL 5081-A SECTION 7.0 PROGRAMMING 7.8 CALIBRATION SETUP 7.8.1 Purpose This section describes how to do the following: 1. Enter stabilization criteria for calibration 2. Enter an upper limit for sensor zero 3. Enter a salinity value for air calibration of dissolved oxygen sensors 4.
  • Page 49 MODEL 5081-A SECTION 7.0 PROGRAMMING 6. Set the stabilization range to between 0.01 and 9.99 ppm. The default values are PROGRAM shown in the table. Press ENTER to save. delta . 05 Oxygen 0.05 ppm or 1% EXIT ENTER Free chlorine 0.05 ppm Total chlorine 0.05 ppm...

  • Page 50: Line Frequency

    MODEL 5081-A SECTION 7.0 PROGRAMMING 7.9 LINE FREQUENCy 7.9.1 Purpose This section describes how to maximize noise rejection by entering the frequency of the mains power into the transmitter. 7.9.2 Procedure 1. Press PROG on the remote controller. PROGRAM 2. Press NEXT until the LinE FrEq submenu appears. Press ENTER. line fre9 EXIT NEXT...

  • Page 51: Ph Measurement

    MODEL 5081-A SECTION 7.0 PROGRAMMING 7.10 pH MEASUREMENT NOTE The pH measurement submenu appears only if the transmitter has been configured to measure free chlorine. pH is not available with any other meassurement. 7.10.1 Purpose This section describes how to do the following: 1.
  • Page 52 MODEL 5081-A SECTION 7.0 PROGRAMMING 7.10.3 Procedure 1. Press PROG on the remote controller. PROGRAM 2. Press NEXT until the PH submenu appears. On will be flashing, indicating that the pH measurement and automatic pH correction of free chlorine has been enabled. EXIT NEXT ENTER...
  • Page 53 MODEL 5081-A SECTION 7.0 PROGRAMMING PROGRAM 10. Once diagnostic limits have been set, the display returns to the dIAgnOStIC sub- dIagnostIC menu header. Press NEXT. EXIT NEXT ENTER 11. The PH CAL submenu header appears. Prompts under this header allow the user to PROGRAM enable or disable automatic buffer calibration, select the buffers to be used, and set PH Cal...

  • Page 54: Barometric Pressure

    MODEL 5081-A SECTION 7.0 PROGRAMMING 7.11 BAROMETRIC PRESSURE NOTE The barometric pressure submenu appears only if the transmitter has been configured to measure oxygen. 7.11.1 Purpose This section describes how to do the following 1. Set the units for barometric pressure 2.

  • Page 55: Calibration - Temperature

    MODEL 5081-A SECTION 8.0 CALIBRATION — TEMPERATURE SECTION 8.0 CALIBRATION — TEMPERATURE 8.1 INTRODUCTION All four amperometric sensors (oxygen, ozone, free chlorine, and total chlorine) are membrane-covered sensors. As the sensor operates, the analyte (the substance to be determined) diffuses through the membrane and is consumed at an electrode immediately behind the membrane.

  • Page 56: Procedure

    MODEL 5081-A SECTION 8.0 CALIBRATION — TEMPERATURE 8.2. PROCEDURE 1. Place the sensor and a calibrated reference thermometer in a container of water at ambient temperature. Be sure the temperature element in the sensor is completely submerged by keeping the sensor tip at least three inches below the water level.

  • Page 57: Calibration - Oxygen

    MODEL 5081-A SECTION 9.0 CALIBRATION — OxyGEN SECTION 9.0 CALIBRATION — OxyGEN 9.1 INTRODUCTION As Figure 9-1 shows, oxygen sensors generate a current directly proportional to the concentration of dissolved oxygen in the sample. Calibrating the sensor requires exposing it to a solution containing no oxygen (zero stan- dard) and to a solution containing a known amount of oxygen (full-scale standard).

  • Page 58: Procedure - Zeroing The Sensor

    MODEL 5081-A SECTION 9.0 CALIBRATION — OxyGEN 9.2 PROCEDURE — zEROING THE SENSOR 1. Place the sensor in a fresh solution of 5% sodium sulfite (Na ) in water. Be sure air bubbles are not trapped against the membrane. The current will drop rapidly at first and then gradually reach a stable zero value.

  • Page 59: Procedure - Air Calibration

    MODEL 5081-A SECTION 9.0 CALIBRATION — OxyGEN 9.3 PROCEDURE — AIR CALIBRATION 1. Remove the sensor from the process liquid. Use a soft tissue and a stream of water from a wash bottle to clean the membrane. Blot dry. The membrane must be dry during air calibration. 2.

  • Page 60: Procedure - In-Process Calibration

    MODEL 5081-A SECTION 9.0 CALIBRATION — OxyGEN 9.4 PROCEDURE — IN-PROCESS CALIBRATION 1. The transmitter and sensor can be calibrated against a standard instrument. For oxygen sensors installed in aeration basins in waste treatment plants, calibration against a second instrument is often preferred. For an accurate calibration be sure that: a.

  • Page 61: Calibration - Free Chlorine

    MODEL 5081-A SECTION 10.0 CALIBRATION - FREE CHLORINE SECTION 10.0 CALIBRATION — FREE CHLORINE 10.1 INTRODUCTION As Figure 10-1 shows, a free chlorine sensor generates a current directly proportional to the concentration of free chlorine in the sample. Calibrating the sensor requires exposing it to a solution containing no chlorine (zero stan- dard) and to a solution containing a known amount of chlorine (full-scale standard).

  • Page 62: Procedure - Zeroing The Sensor

    MODEL 5081-A SECTION 10.0 CALIBRATION - FREE CHLORINE 10.2 PROCEDURE — zEROING THE SENSOR 1. Place the sensor in the zero standard (see Section 10.1). Be sure no air bubbles are trapped against the mem- brane. The sensor current will drop rapidly at first and then gradually reach a stable zero value. To monitor the sensor current, go to the main display.

  • Page 63: Procedure - Full Scale Calibration

    MODEL 5081-A SECTION 10.0 CALIBRATION - FREE CHLORINE 10.3 PROCEDURE — FULL SCALE CALIBRATION 1. Place the sensor in the process liquid. If automatic pH correction is being used, calibrate the pH sensor (see Section 13.0) and place it in the process liquid. If manual pH correction is being used, measure the pH of the process liquid and enter the value (see Section 7.6).

  • Page 64: Dual Slope Calibration

    MODEL 5081-A SECTION 10.0 CALIBRATION - FREE CHLORINE 10.4 DUAL SLOPE CALIBRATION Figure 10-2 show the principle of dual slope calibration. Between zero and concentration C1, the sensor response is linear. When the concentration of chlorine becomes greater than C1, the response is non-linear. In spite of the non-linearity, the response can be approximated by a straight line between point 1 and point 2.
  • Page 65 MODEL 5081-A SECTION 10.0 CALIBRATION - FREE CHLORINE CALIBRATE 9. The Pt1 prompt appears. Use the arrow keys to change the flashing . 00 display to the concentration of chlorine determined in the grab sample. EXIT ENTER Press ENTER to save. CALIBRATE 10.

  • Page 66: Calibration - Total Chlorine

    MODEL 5081-A SECTION 11.0 CALIBRATION - TOTAL CHLORINE SECTION 11.0 CALIBRATION — TOTAL CHLORINE 9.1 INTRODUCTION Total chlorine is the sum of free and combined chlorine. The continuous determination of total chlorine requires two steps. See Figure 11-1. First, the sample flows into a conditioning system (SCS 921) where a pump continuously adds acetic acid and potassium iodide to the sample.

  • Page 67: Procedure - Zeroing The Sensor

    MODEL 5081-A SECTION 11.0 CALIBRATION - TOTAL CHLORINE 11.2 PROCEDURE — zEROING THE SENSOR 1. Complete the startup sequence described in the SCS921 instruction manual. Adjust the sample flow to between 80 and 100 mL/min, and set the sample pressure to between 3 and 5 psig. 2.

  • Page 68: Procedure - Full Scale Calibration

    MODEL 5081-A SECTION 11.0 CALIBRATION - TOTAL CHLORINE 11.3 PROCEDURE — FULL SCALE CALIBRATION 1. If the sensor was just zeroed, place the reagent uptake tube back in the bottle. Once the flow of reagent starts, it takes about one minute for the sensor current to begin to increase. It may take an hour or longer for the read- ing to stabilize.

  • Page 69: Dual Slope Calibration

    MODEL 5081-A SECTION 11.0 CALIBRATION - TOTAL CHLORINE 11.4 DUAL SLOPE CALIBRATION Figure 11-3 show the principle of dual slope calibration. Between zero and concentration C1, the sensor response is linear. When the concentration of chlorine becomes greater than C1, the response is non-linear. In spite of the non-linearity, the response can be approximated by a straight line between point 1 and point 2.
  • Page 70 MODEL 5081-A SECTION 11.0 CALIBRATION - TOTAL CHLORINE CALIBRATE 9. The Pt1 prompt appears. Use the arrow keys to change the flashing . 00 display to the concentration of chlorine determined in the grab sample. EXIT ENTER Press ENTER to save. CALIBRATE 10.

  • Page 71: Calibration - Ozone

    MODEL 5081-A SECTION 12.0 CALIBRATION - OzONE SECTION 12.0 CALIBRATION — OzONE 12.1 INTRODUCTION As Figure 12-1 shows, an ozone sensor generates a current directly proportional to the concentration of ozone in the sample. Calibrating the sensor requires exposing it to a solution containing no ozone (zero standard) and to a solution containing a known amount of ozone (full-scale standard).

  • Page 72: Procedure - Zeroing The Sensor

    MODEL 5081-A SECTION 12.0 CALIBRATION - OzONE 12.2 PROCEDURE — zEROING THE SENSOR 1. Place the sensor in the zero standard (see Section 12.1). Be sure no air bubbles are trapped against the mem- brane. The sensor current will drop rapidly at first and then gradually reach a stable zero value. To monitor the sensor current, go to the main display.

  • Page 73: Procedure - Full Scale Calibration

    MODEL 5081-A SECTION 12.0 CALIBRATION - OzONE 12.3 PROCEDURE — FULL SCALE CALIBRATION 1. Place the sensor in the process liquid. Adjust the sample flow until it is within the range recommended for the sensor. Refer to the sensor instruction sheet. 2.

  • Page 74: Calibration - Ph

    MODEL 5081-A SECTION 13.0 CALIBRATION - pH SECTION 13.0 CALIBRATION — pH 13.1 INTRODUCTION A new pH sensor must be calibrated before use. Regular recalibration is also necessary. A pH measurement cell (pH sensor and the solution to be measured) can be pictured as a battery with an extreme- ly high internal resistance.

  • Page 75: Procedure - Auto Calibration

    MODEL 5081-A SECTION 13.0 CALIBRATION - pH 13.2 PROCEDURE — AUTO CALIBRATION 1. Verify that auto calibration has been enabled. See Section 7.10. 2. Obtain two buffer solutions. Ideally, the buffer pH values should bracket the range of pH values to be meas- ured.

  • Page 76: Procedure - Manual Calibration

    MODEL 5081-A SECTION 13.0 CALIBRATION - pH 13.3 PROCEDURE — MANUAL CALIBRATION 1. Verify that manual calibration has been enabled. See Section 7.10. 2. Obtain two buffer solutions. Ideally, the buffer pH values should bracket the range of pH values to be meas- ured.

  • Page 77: Standardization

    MODEL 5081-A SECTION 13.0 CALIBRATION - pH 13.4 STANDARDIzATION 1. The pH measured by the transmitter can be changed to match the reading from a second or reference instru- ment. The process of making the two readings agree is called standardization, or one-point calibration. 2.

  • Page 78: Ph Slope Adjustment

    MODEL 5081-A SECTION 13.0 CALIBRATION - pH 13.5 pH SLOPE ADJUSTMENT 1. If the slope of the glass electrode is known form other measurements, it can be entered directly into the trans- mitter. The slope must be entered as the slope at 25°C. To calculate the slope at 25°C from the slope at tem- perature t°C, use the equation: slope at 25°C = (slope at t°C) t°C + 273...

  • Page 79: Calibration - Current Output

    MODEL 5081-A SECTION 14.0 CALIBRATION — CURRENT OUTPUT SECTION 14.0 CALIBRATION — CURRENT OUTPUT 14.1 GENERAL Although the transmitter outputs are calibrated at the factory, they can be trimmed in the field to match the read- ing from a standard current meter. Both the 4 mA and the 20 mA outputs can be trimmed. During output calibra- tion the transmitter is in Hold.

  • Page 80: Diagnostics

    MODEL 5081-A SECTION 15.0 DIAGNOSTICS SECTION 15.0 DIAGNOSTICS 15.1 GENERAL The 5081-A transmitter can display diagnostic information that is useful in troubleshooting. The diagnostics avail- able depend on the measurement being made. To read diagnostic information, go to the main display and press DIAG on the infrared remote controller.

  • Page 81: Diagnostic Messages For Free Chlorined

    MODEL 5081-A SECTION 15.0 DIAGNOSTICS 15.4 DIAGNOSTIC MESSAGES FOR FREE CHLORINE TyPE FCL Transmitter is measuring free chlorine. Press NEXT to view diagnostics. SEnSor Cur Press ENTER to display raw current from sensor (note units). SEnSitvty Press ENTER to display sensitivity. Sensitivity is calculated during calibration. It is the measured current divided by concentration.

  • Page 82: Troubleshooting

    MODEL 5081-A SECTION 16.0 TROUBLESHOOTING SECTION 16.0 TROUBLESHOOTING 16.1 WARNING AND FAULT MESSAGES 16.2 TROUBLESHOOTING WHEN A WARNING OR FAULT MESSAGE IS SHOWING 16.3 TEMPERATURE MEASUREMENT AND CALIBRATION PROBLEMS 16.4 OxyGEN MEASUREMENT AND CALIBRATION PROBLEMS 16.5 FREE CHLORINE MEASUREMENT AND CALIBRATION PROBLEMS 16.6 TOTAL CHLORINE MEASUREMENT AND CALIBRATION PROBLEMS 16.7...

  • Page 83: Troubleshooting When A Warning Or Fault Message Is Showing

    MODEL 5081-A SECTION 16.0 TROUBLESHOOTING 16.2 TROUBLESHOOTING WHEN A FAULT OR WARNING MESSAGE IS SHOWING Message Explanation See Section OuEr rAnGE Over range, measurement exceeds display limit 16.2.1 AMP FAIL Amperometric sensor failure, sensor current is too high 16.2.1 bAd SEnSor Bad sensor, sensor current is a large negative number 16.2.2 0 too biG...
  • Page 84 MODEL 5081-A SECTION 16.0 TROUBLESHOOTING 16.2.2 bAd SEnSor. Bad sensor means that the sensor current is a large negative number. 1. bAd SEnSor may appear for a while when the sensor is first placed in service. Observe the sensor current (go to SEnSor Cur under the diagnostic menu).
  • Page 85 MODEL 5081-A SECTION 16.0 TROUBLESHOOTING 16.2.7 SenSE OPEn Most Rosemount Analytical sensors use a Pt100 or Pt1000 in a three-wire configuration (see Figure 16-5). The in and return leads connect the RTD to the measuring circuit in the analyzer. A third wire, called the sense line, is connected to the return lead.
  • Page 86 MODEL 5081-A SECTION 16.0 TROUBLESHOOTING 16.2.10 -0- OFFSEt The -0- OFFSEt message appears if the standardization offset (in mV) exceeds the programmed limit. The default limit is 60 mV, which is equivalent to about a unit change in pH. Before increasing the limit to make the -0- OFFSEt message dis- appear, check the following: 1.

  • Page 87: Temperature Measurement And Calibration Problems

    MODEL 5081-A SECTION 16.0 TROUBLESHOOTING 16.2.14 AdC AdC means the analog to digital converter has failed. 1. Verify that sensor wiring is correct and connections are tight. Be sure to check connections at the junction box if one is being used. See Section 3.0. 2.

  • Page 88: Oxygen Measurement And Calibration Problems

    MODEL 5081-A SECTION 16.0 TROUBLESHOOTING 16.4 OxyGEN MEASUREMENT AND CALIBRATION PROBLEMS Problem See Section Zero current is substantially greater than the value in Section 9.2 16.4.1 Zero reading is unstable 16.4.2 Sensor current during air calibration is substantially different from the value in Section 9.3 16.4.3 Process and standard instrument readings during in-process calibration are substantially different 16.4.4...
  • Page 89 MODEL 5081-A SECTION 16.0 TROUBLESHOOTING 16.4.3 Sensor current during air calibration is substantially different from the value in Section 9.3. 1. Is the sensor properly wired to the transmitter? See Section 3.0. Verify that all connections are tight. 2. Is the membrane dry? The membrane must be dry during air calibration. A droplet of water on the membrane during air calibration will lower the sensor current and cause an inaccurate calibration.

  • Page 90: Free Chlorine Measurement And Calibration Problems

    MODEL 5081-A SECTION 16.0 TROUBLESHOOTING 16.4.7 Sensor does not respond to changes in oxygen level. If readings are being compared with a portable laboratory instrument, verify that the laboratory instrument is working. Is the membrane clean? Clean the membrane and replace it if necessary. Check that the holes at the base of the cathode stem are open.
  • Page 91 MODEL 5081-A SECTION 16.0 TROUBLESHOOTING 16.5.2 zero reading is unstable. 1. Is the sensor properly wired to the transmitter? See Section 3.0. Verify that all wiring connections are tight. 2. Readings are often erratic when a new or rebuilt sensor is first placed in service. Readings usually stabilize after about an hour.

  • Page 92: Total Chlorine Measurement And Calibration Problems

    MODEL 5081-A SECTION 16.0 TROUBLESHOOTING 16.5.5 Readings drift. 1. Is the sample temperature changing? Membrane permeability is a function of temperature. The time constant for the 499ACL-01 sensor is about five minutes. Therefore, the reading may drift for a while after a sudden temperature change.

  • Page 93: Ozone Measurement And Calibration Problems

    MODEL 5081-A SECTION 16.0 TROUBLESHOOTING 16.7 OzONE MEASUREMENT AND CALIBRATION PROBLEMS Problem See Section Zero current is substantially outside the range -10 to 10 nA 16.7.1 Zero reading is unstable 16.7.2 Sensor current during calibration is substantially less than about 350 nA/ppm at 25°C 16.7.3 Process readings are erratic 16.7.4...
  • Page 94 MODEL 5081-A SECTION 16.0 TROUBLESHOOTING 16.7.4 Process readings are erratic. 1. Readings are often erratic when a new sensor or a rebuilt sensor is first placed in service. The current usually stabi- lizes after a few hours. 2. Is the sample flow within the recommended range? High sample flow may cause erratic readings. Refer to the sensor instruction sheet for recommended flow rates.
  • Page 95 MODEL 5081-A SECTION 16.0 TROUBLESHOOTING 16.8.1 SLOPE HI or SLOPE LO message is showing. Refer to Section 16.2.9 for assistance. 16.8.2 -0- OFFSEt message is showing. Refer to Section 16.2.10 for assistance. 16.8.3 Transmitter will not accept manual slope. If the sensor slope is known from other sources, it can be entered directly into the transmitter. The transmitter will not accept a slope (at 25°) outside the range 45 to 60 mV/pH.
  • Page 96 MODEL 5081-A SECTION 16.0 TROUBLESHOOTING 2. Is the process grounded? a. The measurement system needs one path to ground: through the process liquid and piping. Plastic piping, fiber- glass tanks, and ungrounded or poorly grounded vessels do not provide a path. A floating system can pick up stray voltages from other electrical equipment.

  • Page 97: Simulating Input Currents - Dissolved Oxygen

    MODEL 5081-A SECTION 16.0 TROUBLESHOOTING 16.9 SIMULATING INPUT CURRENTS - DISSOLvED OxyGEN To check the performance of the transmitter, use a decade box to simulate the current from the oxygen sensor. A. Disconnect the anode and cathode leads from terminals 13 & 14 and connect a decade box as shown in Figure 16-1. It is not necessary to disconnect the RTD leads.

  • Page 98: Simulating Inputs - Ph

    MODEL 5081-A SECTION 16.0 TROUBLESHOOTING 16.11 SIMULATING INPUTS - pH 16.11.1 General This section describes how to simulate a pH input into the transmitter. To simulate a pH measurement, connect a standard millivolt source to the transmitter. If the transmitter is working properly, it will accurately measure the input voltage and con- vert it to pH.

  • Page 99: Simulating Temperature

    MODEL 5081-A SECTION 16.0 TROUBLESHOOTING 16.12 SIMULATING TEMPERATURE 16.12.1 General The transmitter accepts either a Pt100 RTD (used in pH, 499ADO, 499ATrDO, 499ACL-01, 499ACL-02, and 499AOZ sensors) or a 22k NTC thermistor (used in HX438 and Gx448 DO sensors and most steam-sterilizable sensors from other manufacturers).

  • Page 100: Measuring Reference Voltage

    MODEL 5081-A SECTION 16.0 MAINTENANCE 16.13 MEASURING REFERENCE vOLTAGE Some processes contain substances that poison or shift the potential of the reference electrode. Sulfide is a good example. Prolonged exposure to sulfide converts the reference electrode from a silver/silver chloride electrode to a silver/silver sulfide electrode.

  • Page 101: Maintenance

    MODEL 5081-A SECTION 17.0 MAINTENANCE SECTION 17.0 MAINTENANCE 17.1 OvERvIEW This section gives general procedures for routine maintenance of the 5081-A transmitter. The transmitter needs almost no routine maintenance. 17.2 TRANSMITTER MAINTENANCE Periodically clean the transmitter window with household ammonia or glass cleaner. The detector for the infrared remote controller is located behind the window at the top of the transmitter face.

  • Page 102: Replacement Parts For Model 5081-A Transmitter

    MODEL 5081-A SECTION 17.0 MAINTENANCE TABLE 17-1. Replacement Parts for Model 5081-A Transmitter Location in Shipping Figure 17-1 Description Weight 23992-00 PCB stack consisting of the CPU (part 3) and analog (part 4) boards, 1 lb/0.5 kg display board is not included, CPU and analog boards are factory- calibrated as a unit and cannot be ordered separately 23638-01 LCD display PCB...

  • Page 103: Return Of Material

    MODEL 5081-A SECTION 18.0 RETURN OF MATERIAL SECTION 18.0 RETURN OF MATERIAL 18.3 NON-WARRANTy REPAIR. 18.1 GENERAL. The following is the procedure for returning for repair To expedite the repair and return of instruments, proper instruments that are no longer under warranty: communication between the customer and the factory is important.

  • Page 104: Barometric Pressure As A Function Of Altitude

    MODEL 5081-A-HT APPENDIx A APPENDIx A BAROMETRIC PRESSURE AS A FUNCTION OF ALTITUDE The table shows how barometric pressure changes with altitude. Pressure values do not take into account humidity and weather fronts. Altitude Barometric Pressure mm Hg in Hg 1.013 29.91 101.3...

  • Page 105: Model 4000 Percent Oxygen Sensor For Measurement In Gas

    MODEL 5081-A-HT APPENDIx B APPENDIx B Model 4000 Percent Oxygen Sensor for Measurement in Gas Description and Specifications • STABLE, RELIABLE amperometric Oxygen Sensor • LONG LIFE, LOW MAINTENANCE rechargeable sensor • ROBUST DESIGN for harsh applications • RAPID CALIBRATION using ambient air •...
  • Page 106 MODEL 4000 SPECIFICATIONS SPECIFICATIONS Range: 0-25% Oxygen Linearity: For constant sample temperature after correction for sensor zero offset: ±1% of full scale Repeatability: ± 0.1% of range Stability: Zero drift ± 0.25% O per week @ 25°C; Span drift ± 0.25% O per week @ 25°C Response Time: 90% in 20 seconds for a step change, using an equilibrated sensor at 25°C Sample Pressure: 0 to 50 PSIG...
  • Page 107 MODEL 4000 INSTALLATION FIGURE 2. vertical Installation (Preferred) FIGURE 3. Horizontal Installation INSTRUMENT SET UP FOR % OxyGEN MEASUREMENT Press Program, Display, Type = O2. Unit = %. Refer to Figure 6 for wiring diagram. CALIBRATION Air calibration is recommended. Using a certified span gas is an option, but since the concentration of oxygen in ambient air is close to 21% at sea level, this is the best solution.
  • Page 108 MODEL 4000 WIRING FIGURE 4. Wiring to Model 5081...
  • Page 109 MODEL 4000 PROCEDURE PROCEDURE TO RECHARGE THE SENSOR: Refer to Figure 8 for an exploded view of the sensor. 1. Unscrew the knurled cap from the sensor body. Remove the membrane assembly. Empty all electrolyte from the sensor. Flush the sensor with distilled or deionized water to remove all particulate. 2.
  • Page 111 NESS FOR PARTICULAR PURPOSE, OR ANY OTHER MATTER WITH RESPECT TO ANY OF THE GOODS OR SERVICES. RETURN OF MATERIAL Material returned for repair, whether in or out of warranty, should be shipped prepaid to: Emerson Process Management Rosemount Analytical 2400 Barranca Parkway...
  • Page 112 Emerson Process Management ©2015 Rosemount Analytical, Inc. All rights reserved. The Emerson logo is a trademark and service mark of Emerson Electric Co. Brand name is a mark 2400 Barranca Parkway of one of the Emerson Process Management family of companies. All other marks are the property Irvine, CA 92606 USA of their respective owners.

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