Honeywell CRIR E1 User Manual

USER GUIDE FOR THE

COMMERCIAL CARBON DIOXIDE SENSOR,

400 PPM TO 2000 PPM (UP TO 5000 PPM

EXTENDED RANGE),

1.0 GENERAL INFORMATION .............................................. 1

2.0 SENSOR HANDLING ........................................................ 3

3.0 AUTOMATIC BASELINE CORRECTION ....................... 3

4.0 TERMINATION ................................................................... 3

5.0 CALIBRATION..................................................................... 6

6.0 SELF-DIAGNOSTICS............................................. ............6

7.0 MODBUS REGISTER DEFINITION............................... ..6

8.0 MODBUS FUNCTION DESCRIPTION........................ ....9

1.0

The CRIR E1 Commercial Carbon Dioxide (CO

single channel, non-dispersive infrared (NDIR) sensor. Within

the CRIR E1 is a sensing chamber with an infrared source at

TABLE 1. SPECIFICATIONS

CHARACTERISTIC

Target gas

Operating principle

Standard range

1, 2

Measurement interval

Accuracy

3

Typical response time (T

90

Sensor warm-up time

Repeatability

Operating voltage

Power consumption

Alarm output, open collector

Serial communication

5

Operating temperature range

Storage temperature range

Operating humidity

Expected operating life

Maintenance

6

Weight

Dimensions

1

The CRIR E1 is designed to measure CO

concentrations below 400 ppm may result in incorrect operation of the ABC algorithm and should be avoided when the ABC is ON.

The CRIR E1 provides readings via UART in the extended range; however, the accuracy is reduced.

2

In normal IAQ applications, the sensor accuracy is defined after a minimum of three ABC periods of continuous operation.

3

The sensor accuracy is specified over the operating temperature range and referenced to certified calibration mixtures. Uncertainty of calibration

4

gas mixtures (±1% currently) is to be added to the specified accuracy for absolute measurements.

See Sections 7.0 and 8.0 for Modbus address and parameter definitions.

5

The CRIR E1 normally does not require maintenance in IAQ applications; however, for some industrial applications, maintenance may be required.

6

CRIR E1

) sensor is a

2

PARAMETER

carbon dioxide (CO

non-dispersive infrared (NDIR)

400 ppm to 2000 ppm, up to 5000 ppm extended range

4 s

±5

0 ppm

)

<120 s

3 minimum typical

>97%

4.5 V to 5.5 V unprotected against surges and reverse connection

300 mA peak, 30 mA average

1000 ppm/800 ppm normal state is conducting maximum 100 mA.

Transistor open at CO

UART, Modbus protocol

0°C to 50°C

-40°C to 70°C

0 %RH to 90 %RH non-condensed

10 years

maintenance-free for normal indoor applications

<8 g

33 mm x 22 mm X 11,2 mm (tolerance ±0,5 mm)

in the range of 400 ppm to 2000 ppm with the accuracy specified in Table 1; however, exposure to

2

one end and a detector fitted with an optical filter at the other

end. The source emits radiation at wavelengths which include

the absorption band of CO

are not sensitive to the presence of CO

selectivity and sensitivity. As the light passes through the

sensing chamber, a fraction is absorbed if CO

difference between the light emitted by the source and received

by the detector can then be converted to a CO

reading. The Automatic Baseline Correction (ABC) function can

automatically calibrate the sensor's lowest reading over a pre-

configured interval to 400 ppm CO

stability and may eliminate the need for calibration.

See Tables 1 and 2, and Figures 1 and 2 for specifications and

mounting and dimensional diagrams.

)

2

±5

% of reading

high or at sensor failure (see Figure 1).

2

000841

. The filter blocks wavelengths which

2

, thereby increasing

2

is present. The

2

concentration

2

. This enhances long term

2

Issue 1