Honeywell CRIR-M1 User manual

Solent Gas Consultants Ltd
Specialists in Gas Detection
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Carbon Dioxide CRIR-M1 User Guide
Commercial Carbon Dioxide CRIR-M1

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Honeywell CRIR-M1 User Guide
TABLE OF CONTENTS
GENERAL INFORMATION
SENSOR HANDLING
AUTOMATIC BASELINE CORRECTION
TERMINATION
CALIBRATION
SELF-DIAGNOSTICS
MODBUS REGISTER DEFINITION
MODBUS FUNCTION DESCRIPTION

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Honeywell CRIR-M1 User Guide
GENERAL INFORMATION
Honeywwll’s CRIR M1 Commercial Carbon Dioxide (CO2) sensor is a single channel,
non-dispersive infrared (NDIR) sensor. Within the CRIR M1 is a sensing chamber with
an infrared source at one end and a detector tted with an optical lter at the other end.
The source emits radiation at wavelengths which include the absorption band of CO2.
The lter blocks wavelengths which are not sensitive to the presence of CO2, thereby
increasing selectivity and sensitivity. As the light passes through the sensing chamber,
a fraction is absorbed if CO2is present. The difference between the light emitted by
the source and received by the detector can then be converted to a CO2concentration
reading. The Automatic Baseline Correction (ABC) function can automatically calibrate
the sensor’s lowest reading over a precongured interval to 400 ppm CO2. This
enhances long term stability and may eliminate the need for calibration.
See Tables 1 and 2, and Figures 1 and 2 for specications and mounting and
dimensional diagrams.

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CHARACTERISTIC PARAMETER
Target Gas Carbon dioxide (CO2)
Operating Principle Non-dispersive infrared (NDIR)
Standard Range 1, 2 400 ppm to 2000 ppm, up to 10000 ppm extended range
Measurement interval 4 s
Accuracy 3±40 ppm ± 3% of reading
Typical response time (T90) <120 s
Sensor warm-up time 3 minutes typical
Repeatability >97%
Operating voltage 4.5 to 5.5 V unprotected against surges and reverse connection
Power consumption 300 mA peak, 30 mA average
Alarm output, open collector 1000 ppm / 800 ppm normal state is conducting max 100 mA.
Transistor open at CO2 high or at sensor failure (see Figure 1).
Serial communication 5UART, Modbus protocol
Operating temperature range 0°C to 50°C
Storage temperature range -40°C to 70°C
Operating humidity 0 %RH to 90 %RH non-condensing
Expected operating life 10 years
Maintenance 6Maintenance-free for normal indoor applications
Weight <8 g
Dimensions 33 mm x 22 mm X 11,2 mm (tolerance ±0,5 mm)
Table 1 - Product Specifcation
1 The CRIR M1 is designed to measure CO2 in the range of 400 ppm to 2000 ppm with the accuracy specied in Table 1;
however, exposure to concentrations below 400 ppm may result in incorrect operation of the ABC algorithm and should
be avoided when the ABC is ON.
2 The CO2 sensor provides readings via UART in the extended range; however, the accuracy is reduced.
3 In normal IAQ applications, the sensor accuracy is dened after a minimum of three ABC periods of continuous
operation.
4 The sensor accuracy is specied over the operating temperature range and referenced to certied calibration mixtures.
Uncertainty of calibration gas mixtures (±1% currently) is to be added to the specied accuracy for absolute
measurements.
5 See the CRIR M1 User Guide for Modbus address and parameter denitions.
6 The CO2 sensor normally does not require maintenance in IAQ applications; however, for some industrial applications,
maintenance may be required.
Figure 1 - Alarm State Diagram

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Figure 2 - Mounting Dimensions (mm) - for reference only
PIN
NUMBER FUNCTION
1bCAL_in/CAL_in
2UART_R/T
3 UART_TXD
4UART_RXD
5 DVCC_out (3.3 V)
6Vin_(4.5 V to 5.5 V)
7GND
8Alarm output
9 PWM output
Table 2 - Pinout

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CAUTION
IMPROPER SENSOR HANDLING
• The CRIR M1 is an electrostatic-sensitive
device (ESD). Handle the CRIR M1
using appropriate ESD methods such as
electrostatic dissipative gloves, wrist straps,
etc.
• Handle the CRIR M1 by the black PCB on the
edges as shown in Figure 1.
• Ensure that the gas diffusion area shown in
Figure 1 is not blocked or contaminated.
• Ensure that force is not applied to the CRIR
M1’s optical chamber.
• Ensure that the CRIR M1 is not subject to
drops or vibration.
Failure to comply with these instructions may
result in product damage.
SENSOR HANDLING
CAUTION
EXPOSURE TO HARMFUL GASES
• Ensure that the CRIR M1 does not come into
contact with the
• following harmful gases:
• Acidic: Includes HCl, HF, H2S, SO2, NOx, etc.
• Basic: Includes NH3, PH3, N2H4, etc.
• Strong oxidising: Includes Cl2, F2, O3, H2O2,
etc.
Failure to comply with these instructions may
result in product damage.
NOTICE
To extend the CRIR M1’s lifetime, ensure that
it does not come into contact with salt spray,
Figure 3 - CRIR M1 Appearance

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AUTOMATIC BASELINE CORRECTION (ABC)
Honeywell’s CRIR M1's built-in, self-correcting ABC algorithm allows maintenance-free operation in
normal indoor environments. This algorithm automatically calibrates the sensor’s lowest reading
over a precongured time interval to 400 ppm CO2, the expected CO2concentration in fresh air, thus
compensating for sensor drift.
Table 3 shows the ABC period specications. Please refer to the Modbus Function Description section
for setting the ABC period.
CHARACTERISTIC PARAMETER
ABC Periods 14 hours to 4800 hours (default is 180 hours)
Table 3 - ABC Period Specication
1 ABC periods can be congured per the user’s requirements. The available range is 4 hours to 4800 hours, and it must
be an integer multiple of 4.
NOTICE
Exposing the CRIR M1 to CO2 concentrations below 400 ppm may result in incorrect operation of
the ABC algorithm and shall be avoided when the ABC function is ON. For how to switch the ABC
function on/off, refer to the Modbus Function Description section.
One ABC period (n hours) requires the completion of n/4 intervals of 4 hours of operation per interval.
The CRIR M1, however, does not necessarily need to operate continuously for n hours to activate the
ABC function. The CRIR M1 counts the number (m) of completion of 4 hour intervals. If m reaches
n/4, the ABC function is activated. For each 4 hour interval, however, the CRIR M1 must operate
continuously, otherwise its contribution to m is not counted.
For example, if the sensor powers off after 6 hours of operation, the rst 4 hours of operation are
counted as the completion of one 4 hour interval, which is added to m and stored in the sensor
memory. The remaining 2 hours of operation, however, do not count because the 4 hour requirement
is not met. Therefore, they are not recorded after the power off. To complete the next 4 hour interval,
the CRIR M1 must be powered on and operate continuously for another 4 hours.

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TERMINATION
Table 4 - Termination - I/O Options Dedicated to the CRIR M1
PIN NUMBER PIN FUNCTION DESCRIPTION ELECTRONIC SPECIFICATION
Power Pins
6Vin Power supply plus terminal
Operation voltage range
Unprotected against reverse connection
4.5 to 5.5 V
7 GND Power supply minus terminal
Sensor’s reference (ground) terminal
-
-
Communication Pins
2UART_R/T
Direction control line for half duplex,
RS485 transceiver like MAX 485
congured as digital output
Absolute max voltage range1
Internal pull down to GND resistor
Output low level1
Output high level1
No internal protection, pulled down at
processor reset (power up and power
down)
GND to DVCC_out + 0.5 V
120 k
0.4 VDC maximum at 8 mA sink
2.4 VDC minimum at 8 mA source
3 UART_TxD
UART data transmission line congured as
digital output
Absolute maximum voltage range1
Internal pull up to DVCC_out resistor
Output low level1
Output high level1
No internal protection, pulled up to
DVCC_out at processor reset (power up
and power down)
GND to DVCC_out + 0.5 V
120 k
0.4 VDC maximum at 8 mA sink
2.4 VDC minimum at 8 mA source
4UART_RxD
UART data receive line congured as
digital output
Absolute maximum voltage range1
Internal pull up to DVCC_out resistor
Input low level1
Input high level1
No internal protection, pulled up to
DVCC_out at processor reset (power up
and power down)
GND to DVCC_out + 0.5 V
120 k
GND to 0.75 V
2.3 V to DVCC_out + 0.3 V
Input/Output Pins
1bCAL_in
/CAL
Digital input forcing background or zero
calibration
Background calibration: When closed
for minimum 4 s, maximum 8 s, bCAL
(background calibration) assuming 400
ppm CO2exposure
Zero calibration: When closed for
minimum 16 sCAL (zero calibration)
assuming 0 ppm CO2exposure
Absolute maximum voltage range1
Internal pull up to GND resistor
Input low level1
Input high level1
No internal protection, pulled up to
DVCC_out at processor reset (power up
and power down)
GND to DVCC_out + 0.5 V
120 k
GND to 0.75 V
2.3 V to DVCC_out + 0.3 V
1 The specied parameter relies on the subcontractor's specication and is not tested by Honeywell.

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Table 4 - Termination - I/O Options Dedicated to the CRIR M1 (continued)
PIN NUMBER PIN FUNCTION DESCRIPTION ELECTRONIC SPECIFICATION
5 DVCC_out
From sensor’s voltage regulator, output
may be used to logical level converter
if master processor runs at 5 V supply
voltage
Series resistance
Nominal voltage
Allowed source current
Voltage precision1
Induced noise or excessive current drawn
may affect sensor performance; external
series resistor is strongly recommended if
this pin is used
No internal protection
3.3 ± 0.1 VDC
6 mA maximum
±0.75% is typical, ±3% is maximum
8Alarm_OC
Open collector output for alarm indication
Absolute maximum voltage range1
Internal pull up to G+ resistor
Maximum sink current1
Saturation voltage1
No internal protection, pulled up to G+ at
processor reset (power up and power down)
GND to 5 V + 0.5 V
10 k
100 mA
2.3 V to Vin + 0.3 V
9PWM 1 kHz
PWM output congured as digital output
used for direct reading by customer’s
microcontroller or toprovide analog output
Duty cycle minimum
Duty cycle maximum
PWM resolution
PWM period
Absolute maximum voltage range1
Internal pull down to GND resistor
Output low level1
Output high level1
No internal protection, pulled down at
processor reset (power up and power
down)
0%, output low
100%, output high
0.5 us ± 4%
1 ms ± 4%
GND to DVCC_out + 0.5 V
120 k
0.4 VDC maximum at 8 mA sink
2.4 VDC minimum at 8 mA source
1 The specied parameter relies on the subcontractor's specication and is not tested by Honeywell.
CALIBRATION
With the ABC function on, the sensor readings, which may have drifted, due to mishandling during
transportation and/or installation, may gradually be recalibrated to the correct numbers. However, in
case the user cannot wait for several cycles of ABC to run, the two quick manual calibrations described
below may be performed.
CAL_in Pin Calibration
Two CAL_in Pin calibration types are offered:
• bCAL (background calibration): Requires the sensor to be exposed to fresh air (400 ppm CO2).
• CAL (zero calibration): Requires the sensor cell to be completely immersed in a CO2free
atmosphere.
A switch input is dened for the operator or master system to select one of the two prepared
calibration codes shown in Table 5. It is recommended that the sensor be exposed to the
targeted gas atmosphere for at least 10 minutes to ensure the CO2concentration inside the sensor
chamber is stable at the argeted value.

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Table 5 - Default Settings of BCAL_IN and CAL_IN
INPUT DEFAULT FUNCTION
bCAL_in Available when closed for minimum 4 s / maximum 8 s; bCAL
assuming 400 ppm CO2 sensor exposure
CAL_in Available when closed for minimum 16 s; CAL assuming 0 ppm
CO2sensor exposure
Modbus Calibration
Two Modbus calibration types are offered:
• Background Calibration: Requires the sensor to be exposed to fresh air (400 ppm CO2).
• Second Point Calibration: Requires the sensor to be exposed to a certain atmosphere with
a steady CO2 concentration other than 400 ppm, and that this CO2concentration should be
informed via Modbus communication to the sensor.
For more details about the Modbus address and parameters conguration for user calibration,
refer to the Modbus Function Description section.
The CRIR M1 has the following built-in, self-diagnostic functions:
• A full system check that runs automatically every time the power is turned on.
• The sensor probes are checked against failure constantly during operation by checking
he valid dynamic measurement ranges.
• All ash updates, initiated by the sensor itself or by external connections, are checked by
subsequent memory read back and data comparisons.
These system checks return error bytes to the system RAM. The full error codes are available
from the UART port communication. The Out of Range error is reset automatically after the
CO2readings return to the normal measuring range. The Memory error can be reset by
power off/on. After the reset of the Memory error, it is recommended to check the settings
stored in the memory to ensure they are the desired values.
SELF-DIAGNOSTICS