USER GUIDE FOR THE
COMMERCIAL CARBON DIOXIDE SENSOR,
400 PPM TO 2000 PPM (UP TO 10000 PPM
EXTENDED RANGE),
TABLE OF CONTENTS
4.0 TERMINATION ................................................................... 3
5.0 CALIBRATION..................................................................... 6
1.0
GENERAL INFORMATION
The CRIR M1 Commercial Carbon Dioxide (CO
single channel, non-dispersive infrared (NDIR) sensor. Within
the CRIR M1 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 M1 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 M1 provides readings via UART in the extended range; however, the accuracy is reduced..
2
3
In normal IAQ applications, the sensor accuracy is defined after a minimum of three ABC periods of continuous operation.
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 M1 normally does not require maintenance in IAQ applications; however, for some industrial applications, maintenance may be required.
6
CRIR M1
) sensor is a
2
PARAMETER
carbon dioxide (CO
non-dispersive infrared (NDIR)
400 ppm to 2000 ppm, up to 10000 ppm extended range
4 s
±4
0 ppm
)
<120 s
3 min 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 max 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
±3
% of reading
high or at sensor failure (see Figure 1).
2
000842
. The filter blocks wavelengths which
2
, thereby increasing
2
is present. The
2
concentration
2
. This enhances long term
2
Issue 1