Honeywell CRIR-E1 Manuel utilisateur

Solent Gas Consultants Ltd

Specialists in Gas Detection

[email protected] Tel: 07788 548013

Carbon Dioxide CRIR-E1 User Guide

Commercial Carbon Dioxide CRIR-E1

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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-con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 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 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 CRIR E1 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 Sections 7.0 and 8.0 for Modbus address and parameter denitions.

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

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 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 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 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 congured 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 congured 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

congured 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 congured 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 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 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 congured 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 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 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 conguration 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 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 CO2 concentration inside the sensor chamber is

stable at the targeted value.

Table des matières

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