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Ashcroft ST-2A Operating Manual

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ST-2A
DIGITAL
INDICATOR
OPERATING
MANUAL
REVISION 4.3 3/2004
I&M002-10092-(AST-MAN) 1CDPS6/00 4P7/06
Table of Contents
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Summary of Contents for Ashcroft ST-2A

  • Page 1 ST-2A DIGITAL INDICATOR OPERATING MANUAL REVISION 4.3 3/2004 I&M002-10092-(AST-MAN) 1CDPS6/00 4P7/06...
  • Page 2 Should you require service for this instrument or wish to take advantage of our expert factory recalibration services, please contact the factory for return information: Ashcroft Inc. 250 East Main Street Stratford, CT 06614, USA Tel: (203) 378-8281...

  • Page 3: Table Of Contents

    Table of Contents Section Description Page ..........................Introduction Base Unit Overview ....................... Quick Select Module Overview ..................1.2.1 The GQS-1 Quick Select Pressure Module ............... 1.2.2 The GQS-2 Quick Select Pressure Module ............... 1.2.3 The GQS-RT Quick Select RTD Temperature Interface Module......1.2.4 The GQS-TC Quick Select Thermocouple Module ..........

  • Page 4: Description

    Section Description Page ........................12.0 Damping Function 12.1 Set Up of Damping Function ..................20 12.2 Activating or Discontinuing Damping ................20 ........................13.0 Percent Function 13.1 Set Up of Percent Function .................... 21 13.2 Use of Percent Function ....................22 ..........
  • Page 5 Section Description Page 19.0 RS232 Interface (Continued) 19.3 RS232 Set Up for Journal Mode Operation ..............38 19.4 RS232 Set Up for Inquiry Mode Operation ..............40 ..........................20.0 Status 20.1 Reviewing Instrument Status..................41 20.2 Battery Check Function....................41 ......................

  • Page 6: Introduction

    Section 1.0 Introduction twelve factory programmed or one operator designated engineering unit. Temperature measurement data can be Congratulations! Your purchase of the Modular Digi- displayed in degrees Celsius, Fahrenheit, Kelvin or Ran- tal Indicator (MDI) calibration system equips you to kine.

  • Page 7: The Gqs-1 Quick Select Pressure Module

    Section 1.2.1 The GQS-1 Quick Select orientation. When positioned in this fashion, the output Pressure Module will be near zero when no pressure (stress) is applied and will increase in a near linear fashion with the ap- GQS-1 Quick Select pressure modules provide spe- plication of pressure or vacuum.

  • Page 8: The Gqs-Tc Quick Select Thermocouple Module

    Section 1.2.4 The GQS-TC1 Quick Select Section 3.1 Power Cord Connection Thermocouple Interface Module The MDI system is powered via standard 110 Vac, 60 Hz, 230 Vac, 50 Hz or 100 Vac, 60 Hz line power. The line The GQS-TC1 allows the base unit, when used with a power is adapted to meet the 9 Vdc power requirements thermocouple interface module, to perform temperature of the MDI system via a standard outlet mounted voltage...

  • Page 9: Installation Of Quick Select Modules

    Step 1 To gain access to the battery compartment, turn pack. Used pack should be treated as hazardous waste the unit bottom side up. and forwarded to a recycling facility. Open the battery compartment by turning the Connect the replacement battery pack and place Step 2 Step 12 quarter turn screw in the battery compartment door.

  • Page 10: Starting Up Mdi Indicator System

    Important Notes: on the module label. The information on the left side of the display corresponds with the Quick Select module 1 – Process connections to the module should: be made installed in the left module bay and information on right using teflon tape or similar sealant, be tested at low side of the display corresponds with the Quick Select pressure prior to applying elevated pressures and...

  • Page 11: Auto Off- Battery Save Function

    ing time delayed data logging on MDI units with the The battery save mode selected is stored in Electrically optional data logging capability. Current date and time Erasable Programmable Read Only Memory (EE- information is only maintained in units with the data PROM).

  • Page 12: Programming Date And Time Information

    Summary of low battery warnings: HH = the current hour using military time 5.6 Vdc: Low battery icon appears where: 5.4 Vdc: Low battery icon remains on display, 0800 = 8:00 AM unit powers down after 15 seconds. 1200 = noon 5.2 Vdc: Power up not allowed 2000 = 8 PM It is estimated that the user will have between 30 and 45...
  • Page 13 Step 2 Using the arrow keys, select the Owner func- To enter a new owner name use the up and down arrows tion from the setup menu. When selected the word to scroll through the alphanumeric entries and the left “Owner”...

  • Page 14: Removing Quick Select Modules

    BAT CK Section 3.6 Removing Quick Select Pressure or Provides available voltage capacity of on- Temperature Modules board NiCad battery pack (if so equipped). *ENG Changing Quick Select pressure modules, therefore Used to select desired engineering unit from UNIT changing the measurement ranges in use, is quick and the following: psi, inHg, inWC, ftSW, Bar, easy.

  • Page 15: Port Select Function

    *DAMP Pressing the Port Select key once will result in the fol- Activates or disables damping used to lowing display change: smooth displayed pressure measurement data from the effects of low level pressure transients. (See Section 12.0 for details.) +123456 +1.234 >...

  • Page 16: Zeroing One Of Two Installed Quick Select Pressure Module

    Left Side of Display Right Side of Display ture measurement data. See Section 9.0 for information pres/temp pres/temp on the tare function. pres/temp electrical measurement Pressing the zero key when two Quick Select pressure electrical measurement pres/temp modules are installed and displayed will simultaneously The pressure/temperature value on the display cor- zero both pressure modules.

  • Page 17: Selecting A Factory Programmed Engineering Unit

    Inch, centimeter and millimeter of water engineering In the preceeding example mBar is the selected unit. units may be set up for conversion at temperatures of 4 Step 3 With the desired engineering unit flashing press degrees and 20 degrees C or 60 degrees F. Consult Sec- the enter key.

  • Page 18: Using A Custom (User Defined) Engineering Unit

    ter 6 digits to provide the required resolution to support Step 8 For this example, after the engineering unit the accuracy of the MDI system . Appendix B provides a label has been keyed the display will read: list of conversion factors. Enter unit’s name Use the number keys to enter the desired conversion factor, entering the required factor from left to right.

  • Page 19: Display Of Two Different Engineering Units

    u_ indicates that the engineering unit in use is a user Pressing the port select one time will deactivate the left defined unit with a label of mSW pressure display converting it to a mA measurement field. Pressing the port select a second time will deac- xxxxxx represents the current pressure measurement(s) tivate the right side, converting it to a mA measurement in the user engineering unit.

  • Page 20: Tare Function

    The MDI system will respond by displaying: +1234 +123456 H2O ref temp 20C 60F 4C Second press of the Step 4 Using the left/right arrow keys select the de- PORT sired temperature for the conversion factor. The selected value will flash on the display. MDI system will respond by displaying the following: H2O ref temp 20C 60F 4C...

  • Page 21: Hold Function

    system will display the last pressure measurement prior appearing in the RS232 output data stream and will also to pressing the TARE key. result in a flashing H appearing on the left side of the top line of the instrument display. Use the number keys to input a tare value other Step 2 than the default value or to change the existing tare...

  • Page 22: Damping Function

    Pressing any key other than the CE key will maintain the In response to the activation of the dampening Step 4 stored values in memory. set up menu the MDI system will respond by displaying the following: Pressing any key on the keypad will return the MDI fast <------- >...

  • Page 23: Percent Function

    of the DAMP key on the keypad. To activate/deactivate If the MDI system is equipped with the data logging op- the damping function press the DAMP key on the key- tion the percent error and percent full scale information board. can be stored in the MDI system on-board memory.

  • Page 24: Use Of Percent Function

    P/E is a pressure or temperature to voltage device The MDI system will respond by displaying: Enter Input FS In this case we are testing a 0-100 inH O range trans- .000000 ducer that produces a 0-10 Vdc output from zero to F.S.

  • Page 25: Set Up For Flow Velocity & Volume Measurement

    curacy of the pitot tube or annubar in use as it relates to Basic keypad functions such as damping, tare, min/max the K factor supplied by the manufacturer of the device recall, mA/V measurement display, battery check, dis- and the accuracy of the correction being made for the air play hold, data logging, zero and port select are avail- density.

  • Page 26: Engineering Unit Selection For Flow Velocity

    Select pressure module, as indicated in the manufac- sure measurement data press the flow key. turers manual for the flow probe, high side to the high FLOW pressure port on the Quick Select pressure module and low side to the low pressure port on the Quick Select The MDI system will respond by displaying: module.

  • Page 27: Engineering Unit Selection For Flow Volume

    Section 14.5 Engineering Units for Flow Volume ft/min ft/sec MeterSec As with standard pressure measurement the MDI system can provide flow volume measurements in a variety of When in the flow volume mode the engineering unit units of measure. To select a unit of measure for flow selection is: velocity follow the steps below.
  • Page 28 measurement from one installed Quick Select pressure UNIT module and a pressure measurement from a second in- stalled Quick Select Pressure module. For example, the The MDI system will respond by displaying: measurement of flow can be displayed in ft/min for one ft/min ft/sec installed Quick Select pressure module and the second } MPH...

  • Page 29: Simultaneous Display Of Flow Volume And Flow Velocity

    ment correct, reactivate the deactivated port using the may be changed at any time while the MDI system is port select function. displaying any combination of flow and temperature measurement data. Simply use the engineering unit PORT select function as described in Section 14.2 for flow velocity and Section 14.4 for flow volume.

  • Page 30: Electrical Output Measurement

    Pressing port select a second time will deactivate the left To Exit Flow Measurement and Return to Basic Pressure side of the display from flow or pressure measurement, Measurement Press the Clear Entry Key (CE) converting it to a mA measurement. The right side of the Section 14.10 Simultaneous Display of Flow display will resume flow/pressure measurement activi-...

  • Page 31: Leak Detection Function

    Step 5 Connect the Quick Select Sensor module to be Step 5 With the word Rate flashing press the enter key. used to the pressure source to be measured. Connect the output of the device to the standard Step 6 The MDI system will respond by displaying: banana jacks on the keypad of the MDI system as follows: Vessel Volume...

  • Page 32: Decay Tests

    Section 15.4 Performing Leak Rate or Pressure The MDI system will respond by displaying: Decay Tests Leak Mode Rate Decay Leak rate and pressure decay tests are performed as follows: With the MDI on and reading pressure connect Step 1 Step 4 Using the left/right arrow select the word Decay.

  • Page 33: Temperature Measurement Using Rtd Probes

    Engineering Units: where: Fahrenheit, Celsius, Kelvin, Rankine or ohms Eng Unit = the engineering unit of the current pressure Ohms Measurement Range: measurement value. GQS-RT1 module: 0/400 ohms cccc = current pressure measurement for the selected pressure module. GQS-RT2 module: 0/4000 ohms xxxx = the measured leak rate over the test interval.
  • Page 34 5-8 available for programming using the optional calibration and programming software for the The MDI system will respond by displaying: GQS-RT1 module, part number 838X014-01 for Probe Connection inch disk or 838X014-02 for 5 / inch disks. Important Note: The GQS-RT1 is compatible with RTD probes with output resistance values of between 0 This represents the configuration of the RTD to be used, and 400 ohms.

  • Page 35: Calibrating And Programming Of The Rtd Interface And Probe

    Section 17.0 Thermocouple Interface Module 0.001% of 400 ohms = 0.00001 x 400 = 0.004 ohms The Thermocouple Interface Module allows the MDI base unit (equipped with firmware version 2.01 or later) For a Pt100 the temperature resolution can be deter- to read the input from a thermocouple temperature mined as follows: measuring device.
  • Page 36 If two thermocouple interface modules have been in- Using the left or right arrow keys, select the degree of stalled, the calibrator will require a selection as to which resolution closest to the working tolerance for the type side (left or right) the current programming cycle is to of thermocouple that has been installed or select the be applied.

  • Page 37: Pressure And Temperature Switch Testing

    Section 18.0 Pressure and Temperature Switch calibration and test operations. If the MDI indicator is Testing to be powered by the battery option, Section 3.2 of this manual should be consulted for the effects of the loop The MDI system can be used to test pressure and tem- power supply on battery life.
  • Page 38 Step 3 With the word “manual” flashing press the Deadband enter key. Step 2 Using the left/right and up/down arrow keys select the word deadband in the menu selection. When selected the word deadband will flash. Gradually increase the pressure, vacuum or Step 4 temperature until the display of the MDI system indi- Disable Manual...

  • Page 39: Rs232 Interface

    TRIP To configure the RS232 interface on the MDI system for the communication with your input device, first determine the interface requirements of the device to be The MDI system will respond by displaying: used with the MDI. Then using the RS232 setup feature Disable Manual configure the RS232 interface on the MDI system, fol- Deadband...

  • Page 40: Rs232- Journal Mode Functional Overview

    Section 19.2.2 RS232 Interface – Journal Mode Section 19.2.4 RS232 Interface – Remote Mode Overview Overview The remote modes supports communication and control This mode allows the MDI system to be interfaced to of the MDI via a PC or terminal. See Appendix A for an RS232 compatible printer or other device where a complete details on remote communications.
  • Page 41 The current baud rate selection will flash on the display. base or spreadsheet program the end of message charac- ter must be selected in accordance with the requirements Step 7 Using the left/right arrow keys select the de- of the application software. Proceed to Step 16 to input a sired baud rate.

  • Page 42: Rs232 Set Up For Inquiry Mode Operation

    be changed or the MDI system may be changed between Baud Rate basic pressure measurement and flow measurement. 960024001200 300 Important Note: Invoking set up functions or dedi- The current Baud rate selection will flash on the display. cated keypad functions will temporarily suspend the transmission of data during the setup process.

  • Page 43: Status

    Step 14 Select the desired end of message character. EvntTimr Dampen For data transmission to a screen on a dumb terminal LeakRate Status the CrLf (carriage return/line feed) is the most com- mon option. If the data output is to be transmitted into With the word Status flashing press the enter key.

  • Page 44: Dual Module Functions

    5.6 Vdc) icon appears on the instrument display. Typical 2 – Rechargeable NiCad battery pack remaining battery life when the low battery icon ap- To check the battery power level press the BAT CK key. pears is approximately 1 hour with backlight off and The MDI system will respond by displaying: no loop power option installed.

  • Page 45: Setting Up Dual Module Differential Pressure Measurement

    Quick Select modules used in the measurement process Step 7 To perform dual module differential pressure and the magnitude of the dp range. In general, the ac- measurement select “L-R”; to exit this dp set up and curacy for the dp measurement for dp ranges less than return to basic pressure measurement select “NONE”.

  • Page 46: Setting Up A Dual Module Summation Pressure Measurement

    zero differential pressure press the TARE Key to elim- play. inate any offset caused by the elevated static to optimize Calib Rtmodule measurement accuracy. dp Meas Notes on interpreting the displayed measurement values: Step 6 With the text “dp Meas” flashing press the 1 –...

  • Page 47: Data Logging Function (Optional)

    Data Log Backup xxxx xxxx Battery is Low Fifth press of the port select key: When this message appears on the display the battery should be replaced as soon as possible. Consult Section 24.2 for details on battery replacement. Acceptable bat- xxxx xxxx teries are listed in section 24.2.

  • Page 48: Data Labeling Function

    Using the up/down and right/left arrows browse Auto Manual Step 2 Line 1 through the data log menu and locate the word “label”. Review Line 2 The menu line that contains the label function appears as: Label Erase Line 3 Label Erase If the MDI system is equipped with the certification gen-...

  • Page 49: Manual Data Logging

    the word “Auto” will flash on the display. For manual, Date/Time Stamp operator controlled, data entry proceed to Section 22.5. Disable Enable Auto Manual In this example we have opted to forego the date/time stamp of the stored data values. With the word ‘‘Auto”...

  • Page 50: Review Of Stored Data On Display

    DATA enter key. The MDI system will respond by displaying: The MDI system will respond by displaying: Auto Manual Readings to Log Review NoneLeftRghtBoth Using the arrow keys select the word “Off”. Step 9 Using the arrow key select the desired Quick Step 4 When selected the word “Off”...

  • Page 51: Erasing Of Selected Stored Data

    Step 4 The MDI system will respond by displaying the 1) The remaining data will stay in the original sequence last data logged value stored in memory. The display of with blank data fields left where the stored data the data logged value will appear as follows: points have been deleted.

  • Page 52: Erasing All Stored Data

    ***WARNING*** Erase This Entry Ent if OK Pressing the enter key with the erase command flashing will irrevocably erase all stored data. If it is required To delete the displayed stored data point press Step 5 that any of the stored data be retained select the word the enter key.
  • Page 53 to highlight the text “CertGen” . memory used. As data is added to the data log memory during the data acquisition process the percent level Select Mode will increase. This will be seen on the display as each Std CertGen data set is added to the data log memory.
  • Page 54 The left/right arrow keys allow for entry of alpha nu- temperature and electrical measurement data). In ad- meric data in any of the 16 available positions. dition to storing the measurement test data the heading or label information for each calibration is also stored in The tag name can be any combination of alphabetical or memory.
  • Page 55 the upward pointing arrow to move in increasing order 10 data points at a time. Done: Completes the collection of “AsFound” mea- yyyy xxxxx surement data. See step 13 for continuation of the “CertGen” process. Redo: Provides the ability to discard all the “As Found” where: data taken under the tag name being tested.
  • Page 56 Step 16 With the desired temperature value displayed press the enter key. The MDI will respond by displaying: Enter#of Testpts The MDI will respond by displaying: .000000 Action Taken None Recal Repl Step 20 Use the numeral keys to enter the number of “as left”...

  • Page 57: Connection Of Mdi To Computer For Upload Of Stored Calibration Data

    time. Use the right pointing arrow to move in in- for an ambient temperature of 73.4 degrees Fahrenheit. creasing order from data point to data point. Use Step 26 With the desired temperature value the upward pointing arrow to move in increasing displayed press the enter key.

  • Page 58: Installing And Operating Upload Software Utilities

    The following steps will allow you to upload stored data text ISO1745. When selected the text ISO1745 will flash. to an IBM compatible PC. Disable ISO1745 Journal In¼qui½ry Turn the power off on the base unit. Step 1 Connect the 9 pin RS232 cable to the MDI Step 2 Step 11 With the text ISO1745 flashing press the...

  • Page 59: Event Timer Function

    Step 2 Remove and place aside the four Phillips head The event timer sets the starting and ending times for screws. unattended monitoring to be performed during a future time period. The Event Timer function is programmed as Holding the two case halves together, turn the Step 3 follows.

  • Page 60: Data Logging Set Up For Event Timer Operation

    10 minutes. Step 5 After the desired time interval is entered and The MDI system will respond by displaying: shown on the display press the enter key. Event Timer Disable Enable The MDI system will respond by displaying the following: Use the right arrow key to select the word En- Step 8 Readings to Log...

  • Page 61: Alarm Function Overview

    system off. Step 1 With the MDI system on and reading pressure press the SET UP key. When the event timer and data log functions are set up as outlined in Section 25, the MDI system will automati- cally turn itself on and make the programmed measure- ments over the desired time interval.

  • Page 62: Recertification Of The Mdi Indicator

    and is seen on the display press the enter key. Low Contact Open Close Step 9 The MDI system will respond by displaying the When the desired configuration has been Step 17 following: selected and the text is flashing on the display, press the enter key.

  • Page 63: Calibration/Recertification Overview

    Section 27.2 Calibration/Recertification Overview dashed line across the display, press the set up key. The base unit calibration firmware provides a means of linearization and recertification of pressure modules and the base unit’s electrical input (Vdc/mA) calibration Using the arrow keys locate the text “Calib” in Step 4 reference.

  • Page 64: Adjustment And Calibration Base Unit Electronics

    Step 10 To perform “as received” readings use the down Step 13 The value displayed under the dashed line arrow key to select Reference Check. When selected represents the as received reading for the 1 Vdc mea- the text “Reference Check” will flash on the display. To surement.
  • Page 65 Step 10 Select the text “Calibration”, when selected the word calibrate will flash on the display Cal½i¼brate Step 2 Using the arrow keys locate the text “Calib” in Ref¼er ence Check the set up menu. Calib RTmodule Step 11 With the text “Calibrate” flashing press the enter key.
  • Page 66 xxxxx work ing The MDI will respond by displaying: After completion of the adjustments for the 30.0000 volt xxxxx working input the MDI will display: Apply 20.0000 mA The word “working” flashes as the MDI makes the nec- to mA jack essary internal adjustment to calibrate the voltage mea- surement electronics to 1.0000 volts.

  • Page 67: Quick Select Pressure Module Recertification

    Step 25 Turn off the MDI and install the desired Quick Select pressure module per instructions provided in Section 3.2. Step 5 Using the arrow keys locate the text “Calib” in the set up menu. Turn on theMDI to resume general pressure Step 26 Calib Rtmodule measurement activities.
  • Page 68 Quick Select module when calibration activities com- menced. Note: The following should be done to zero each type of Enter pres sure ap - pressure module: plied Pres sure Type 100.01 Zero Source In the above example a pressure of 100.01 is being ap- Absolute –...
  • Page 69 For March (03), eleventh (11), 1996 Step 23 With the desired date entered and displayed, Apply the pressure required for point one and Step 30 press the enter key. enter the numerical value, using the number keys of the exact pressure level applied. (Use the engineering unit in use for the left pressure module at the time the Step 24 Turn off the MDI and install the de-...
  • Page 70 0.025-0.07% (10% increments and zero) 0.1% (20% increments and zero) 0.25% (25% increments and zero) When the final linearization point to Step 35 be performed has been completed press the clear entry key. The MDI will respond by displaying: Calibration done Save Can¼cel Step 36 To save the new linearization data...

  • Page 71: Appendix A - Pressure Conversion Factors

    APPENDIX A. – PRESSURE CONVERSION FACTORS CONVERSION FACTORS FOR UNITS OF PRESSURE  Revision 4.3 3/2004...

  • Page 72: Appendix B - Ascii Character Set

    APPENDIX B – ASCII CHARACTER CODE This chart shows the ASCII character set and corresponding code numbers in decimal, hexadecimal and binary form Hexa- Hexa- Hexa- Hexa- ASCII ASCII ASCII ASCII Hexa- Hexa- Hexa- Hexa- ASCII ASCII ASCII ASCII Decimal Decimal Decimal Decimal...
  • Page 73 Hexa- Hexa- Hexa- Hexa- ASCII ASCII ASCII ASCII Hexa- Hexa- Hexa- Hexa- ASCII ASCII ASCII ASCII Decimal Decimal Decimal Decimal Binary Binary Binary Binary decimal decimal decimal decimal Character Character Character Character Decimal Decimal Decimal Decimal Binary Binary Binary Binary decimal decimal decimal...
  • Page 74 Hexa- Hexa- Hexa- Hexa- ASCII ASCII ASCII ASCII Hexa- Hexa- Hexa- Hexa- ASCII ASCII ASCII ASCII Decimal Decimal Decimal Decimal Binary Binary Binary Binary decimal decimal decimal decimal Character Character Character Character Decimal Decimal Decimal Decimal Binary Binary Binary Binary decimal decimal decimal...

  • Page 75: Appendix C - Product Specifications

    APPENDIX C Product Specifications TEMPERATURE INTERFACE MODULES PHYSICAL SPECIFICATIONS Available Accuracies ±0.06 (0/2-0/200 in. H O), ±0.07 (0/0.25-0/1 in. HQS-RT1 and HQS-RT2 interface modules allow Dimensions O) or 0.1% of Span the ST-2H to measure temperature with an RTD: 10.9 in. (L) x 6.74 in. (W) x 4.0 in. (H) Compensated Temperature Range HQS-RT1: Accommodates Pt100, Ni120, Cu120 Panel Cutout...
  • Page 76 STANDARD RANGES ELECTRICAL SPECIFICATIONS HQS-2 HQS-2 HQS-2 HQS-1 HQS-1 HQS-1 Electrical Sourcing Specification: ˝H ˝H Other Engineering Units** Other Engineering Units** 24 Vdc at 25mA. (gauge and (gauge and (gauge and (gauge/ (gauge/ (gauge/ Electrical Measurement Specification: absolute absolute absolute differential differential differential...
  • Page 77 TABLE I System Accuracy (reading in temperature units): Includes the MDI base unit and GQS-TC1 interface module. (Does not include inaccuracy of the thermocouple device. Consult thermocouple manufacturer or ISA MC96.1 for thermocouple accuracy specifications. Typical inaccuracies range from ±1 to ±2.2°C.) Max.

  • Page 78: Appendix D - Serial Communications - Remote Mode

    APPENDIX D Remote Communications Mode MDI Digital Indicator - Remote Mode RS232 Operation Many of the features of the MDI indicator can be accessed and controlled by a remote terminal, PC or PLC. This is accomplished by selecting the remote function in the setup menu which is accessed via the front panel of the indi- cator.
  • Page 79 Step 6. Communication link is established After communications have been sucessfully established you are ready to use the commands listed in the following com- mand library to “talk to” and modify the behavior of the MDI indicator. Command Syntax The MDI indicator expects a CR (carriage return) character as the terminator on the command string. In the following examples the underscore character ( _ ) represents a single space.
  • Page 80 Note: EUNIT_15 through EUNIT_19 commands apply only when a temperature module is installed in one of the MDI ports HOLD? Returns the status of the display hold feature HOLD_1 Activates hold HOLD_0 Deactivates hold KEYLOCK? Returns the status of the keylock feature KEYLOCK_1 Activates (locks out) front panel access KEYLOCK_2...

  • Page 81: Appendix E - Rtd Probe Connector

    APPENDIX E RTD PROBE CONNECTOR SWITCHCRAFT TINI QG (TA4F) FUNCTION FUNCTION FUNCTION 4W– 4W– 4W– 2W– 2W– 2W– 2 WIRE RTD TA4F 3 WIRE RTD TA4F 4 WIRE RTD TA4F Revision 4.3 3/2004...

  • Page 82: Appendix F - Certification Of The Tc1 Thermocouple Interface Module

    APPENDIX F Certification of the TC1 Thermocouple Interface Module THEORY With the TC1 module installed in the base unit (set-up to display in mV), a precision millivolt calibrator/supply will apply a known mV signal to the module/base unit system (simulating the Seebeck voltage) in place of a thermocouple. The applied mV signal can then be read on the base unit display and compared to the nominal input provided by the precision millivolt calibrator/supply.
  • Page 83 Revision 4.3 3/2004...
  • Page 84 Stratford, Connecticut Visit our web site www.ashcroft.com Visit our web site www.ashcroft.com 250 E. Main Street Stratford, CT 06614-5145 Stratford, CT 06614-5145 All specifications are subject to change without notice. All specifications are subject to change without notice. Tel: (203) 378-8281 All sales subject to standard terms and conditions.

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