PCB with electronic components in grey plastic enclosure with cable gland

CO sensor | IP31 | Modbus RTU communication

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Article code ISCMG2-4

Intrastat number 90.27.10.10

Category Car park LPG - CO

Current stock 0 U.

Product description

Parking garage sensor for carbon monoxide detection with modulating analogue output and changeover relay output.

All measured parameters and configuration are accessible via Modbus RTU communication.

The sensor is compatible with multiple supply voltage options with wide tolerance: 24 VDC or 24 VAC ± 10%.

Connections are achieved through pluggable screw terminal blocks and the maximum current consumption is 60 mA.

Additional specifications and description

Where is a CO sensor commonly used?

Carbon monoxide or CO is a colourless, odourless, and deadly gas. Precisely because you can neither smell nor see it, it is extremely dangerous. For this reason, in many regions, the use of CO sensors is required in locations where there is a high risk of CO formation. CO is produced during incomplete combustion processes. Although CO₂ can be detected much faster under these conditions, a CO sensor is usually also installed for safety reasons. Examples of such locations include parking garages or enclosed spaces containing a combustion appliance (heating) or combustion engine.

How to wire and connect this CO sensor?

This sensor has three plug-in cage clamp blocks to simplify connection. The cage clamp terminal blocks reduce wiring and installation time. They eliminate the need for routine maintenance and guarantee a reliable contact for most electrical wires. We recommend using CAT5 or EIB cables. There is one terminal block for the analogue output, one terminal block for the relay output and one terminal block for the power supply and Modbus RTU communication.

This sensor can be powered by either 24 VAC or 24 VDC. Sentera recommends using 24 VDC supply for powering sensors. Most 24 VDC power supplies provide protection against short-circuit, overload and overvoltage. A supply voltage of 24 VDC thus improves the safety and reliability of your installation.

How can I read the measured CO concentration?

This CO sensor has an analogue output that displays the measured CO concentration. The minimum value of the CO range corresponds to the minimum value of the analogue output. The maximum value of the CO range corresponds to the maximum value of the analogue output. The default analogue output type is 0-10 volts, but this can be changed in Modbus Holding Register 163. The options are: 0-10 VDC / 2-10 VDC / 0-5 VDC / 0-20 mA / 4-20 mA / PWM Push-Pull / PWM open collector.

This sensor also features a relay output with a changeover contact. The relay output switches when the set threshold is exceeded. This CO threshold can be set in Modbus Holding Register 193.

Finally, the measured CO concentration can also be read out via Modbus RTU communication in Modbus Input Register 41.

How do I calibrate this CO sensor?

This CO sensor is factory-calibrated. However, we recommend recalibrating annually. This can be done by placing the sensor in clean ambient air with 0 ppm CO and then starting the calibration via Modbus Holding Register 48 or using the jumper on the circuit board (PCB).

About the enclosure of this CO sensor

The enclosure is designed for indoor use. It offers an IP31 protection against ingress of dust and moisture. The housing is designed for wall mounting. We recommend protecting the sensor from direct sunlight. The gray ABS plastic housing looks solid and offers good protection for the sensitive electronics.