Honeywell CRIR-E1 Manuel utilisateur
Solent Gas Consultants Ltd
Specialists in Gas Detection
Carbon Dioxide CRIR-E1 User Guide
Commercial Carbon Dioxide CRIR-E1
Tel: 07788 548013
Honeywell CRIR-E1 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-E1 User Guide
GENERAL INFORMATION
Honeywell’s CRIR E1 Commercial Carbon Dioxide (CO2) sensor is a single channel, non-
dispersive infrared (NDIR) sensor. Within the CRIR E1 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 pre-congured 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 specications 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 5000 ppm extended range
Measurement interval 4 s
Accuracy 3±50 ppm ±5% 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 CO2high 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 E1 is designed to measure CO2 in the range of 400 ppm to 2000 ppm with the accuracy specied 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 CRIR E1 provides readings via UART in the extended range; however, the accuracy is reduced.
3 In normal IAQ applications, the sensor accuracy is dened after a minimum of three ABC periods of continuous
operation.
4 The sensor accuracy is specied over the operating temperature range and referenced to certied calibration
mixtures. Uncertainty of calibration gas mixtures (±1% currently) is to be added to the specied accuracy for absolute
measurements.
5 See Sections 7.0 and 8.0 for Modbus address and parameter denitions.
6 The CRIR E1 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
1DAC
2 UART_RXD
3 UART_TXD
4 UART_R/T
5 bCAL_in/CAL_in
6 PWM output (See CRIR E1 User Manual)
7Alarm output
8GND
9Vin_(4.5 V to 5.5 V)
Table 2. Pinout
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CAUTION
IMPROPER SENSOR HANDLING
• The CRIR E1 is an electrostatic-sensitive
device (ESD).
• Handle the CRIR E1 using appropriate ESD
methods such as electrostatic dissipative
gloves, wrist straps, etc.
• Handle the CRIR E1 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
E1’s optical chamber,
• Ensure that the CRIR E1 is not subject to
drops and vibration.
Failure to comply with these instructions may
result in product damage.
SENSOR HANDLING
CAUTION
EXPOSURE TO HARMFUL GASES
Ensure that the CRIR E1 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 oxidizing: Includes Cl2, F2, O3, H2O2,
etc.
Failure to comply with these instructions may
result in product damage.
NOTICE
To extend the CRIR E1’s lifetime, ensure that it
does not come into contact with salt spray, oil
mist, soot, and high humidity.
Figure 3 - CRIR E1 Appearance
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AUTOMATIC BASELINE CORRECTION (ABC)
Honeywell’s CRIR E1’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 precongured time interval to 400 ppm CO2, the expected CO2concentration in fresh air, thus
compensating for sensor drift.
Table 3 shows the ABC period specications. Please refer to 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 Specication
1 ABC periods can be congured 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 E1 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 Modbus Function Description section.
One ABC period (n hours) requires the completion of n/4 intervals of four hours of operation per
interval. The CRIR E1, however, does not necessarily need to operate continuously for n hours to
activate the ABC function. The CRIR E1 counts the number (m) of completion of 4 hour intervals. If m
reaches n/4, the ABC function is activated. For each four hour interval, however, the CRIR E1 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 four hours of operation
is counted as the completion of one 4 hour interval, which is added to m and stored in the sensor
memory. The remaining two hours of operation, however, do not count because the four hour
requirement is not met. Therefore, they are not recorded after the power off. To complete the next
4 hour interval, the CRIR E1 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 E1
PIN NUMBER PIN FUNCTION DESCRIPTION ELECTRONIC SPECIFICATION
Power Pins
8GND Power supply minus terminal
Sensor’s reference (ground) terminal
-
-
9Vin Power supply plus terminal
Operation voltage range
Unprotected against reverse connection
4.5 V to 5.5 V
Communication Pins
2UART_RxD
UART data receive line congured as
digital output
Absolute maximum voltage range1
Internal pull up to VDD resistor
Input low level1
Input high level1
No internal protection pulled up to VDD at
processor reset (power up and power
down)
GND to VDD + 0.5 V
120 k
GND to 0.75 V
3UART_TxD
UART data transmission line congured as
digital output
Absolute maximum voltage range1
Internal pull up to VDD resistor
Output low level1
Output high level1
No internal protection, pulled up to VDD
at processor reset (power up and power
down)
GND to VDD + 0.5 V
120 k
0.4 VDC maximum at 8 mA sink
4UART_R/T
Direction control line for half duplex,
RS485 transceiver like MAX 485
congured as digital output
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)
GND to VDD + 0.5 V
120 k
0.4 VDC maximum at 8 mA sink
2.4 VDC minimum at 8 mA source
Input/Output Pins
1DAC
DAC output congured as analog output
used for direct reading by customer’s
microcontroller or to provide analog output
Normal concentration range
Normal voltage range
Relationship between output voltage (V)
and CO2 concentration (ppm)
Output accuracy
No internal protection, pulled down at
processor reset (power up and power
down)
400 ppm to 2000 ppm
0.72 V - 0.05 V to 2 V - 0.1 V
V(output) = 0.4 + 0.0008 x C(CO2)
±20 mV
1 The specied parameter relies on the subcontractor's specication and is not tested by Honeywell.
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Table 4 - Termination - I/O Options Dedicated to the CRIR E1 (continued)
PIN NUMBER PIN FUNCTION DESCRIPTION ELECTRONIC SPECIFICATION
5bCAL_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 s CAL (zero calibration)
assuming 0 ppm CO2
exposure
Absolute maximum voltage range1
Internal pull down to GND resistor
Input low level1
Input high level1
No internal protection, pulled up to VDD2
at processor reset (power up and power
down)
GND to VDD + 0.5 V
120 k
GND to 0.75 V
2.3 V to VDD + 0.3 V
6PWM
PWM output congured as digital output
used fordirect reading by customer’s
microcontroller or to provide analog
output.
Normal concentration range
PWM cycle time
Beginning of each cycle
End of each cycle
Relationship between CO2concentration
(ppm) and PWM output
PWM resolution
Absolute maximum voltage range1
Internal pull down to GND resistor
Output low level1
Output high level1
No internal protection, pulled down at pro-
cessor reset (power up and power down)
400 ppm to 2000 ppm
1004 ms ± 5%
high level output, 2 ms
low level output, 2 ms
C(CO2) = 2000 x (TH - 2) / (TH + TL - 4)
TH: time (ms) of high level output in a cycle
TL: time (ms) of low level output in a cycle
0.5 ms ± 4%
GND to VDD + 0.5 V
120 k
0.4 VDC maximum at 8 mA sink
2.4 VDC minimum at 8 mA source
7Alarm_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
1 The specied parameter relies on the subcontractor's specication 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 given in
5.1 and 5.2 may be performed.
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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 as-
suming 400 ppm CO2 sensor exposure
CAL_in Available when closed for minimum 16 s; CAL assuming 0 ppm
CO2 sensor 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 conguration for user calibration,
refer to the Modbus Function Description section.
The CRIR E1 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
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 dened 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 CO2 concentration inside the sensor chamber is
stable at the targeted value.
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