Description
CO detector with relays, display, and buzzer
The QEL Q5C-CO-250P-0-A is a “smart” carbon monoxide sensor/transmitter designed to help keep enclosed spaces like parking garages, warehouses, and service bays safer and better ventilated. It continuously measures CO from 0–250 ppm and turns those readings into clear on-screen numbers and simple control outputs your fans and building systems can use.
A backlit LCD on the front shows live CO levels, while status LEDs and an internal buzzer give you quick visual and audible feedback when CO starts to climb. Three built-in relays can directly start exhaust fans, open dampers, or trigger remote alarms at your chosen setpoints without a separate relay panel for each.
The Q5C is housed in a rugged NEMA 4X / IP66-rated enclosure, so it can handle moisture, dust, and harsh mechanical spaces. Standard 24 VAC/VDC power and familiar 4–20 mA / voltage outputs make it easy to drop into existing control designs. And RS-485 communications let it talk to QEL controllers or a Modbus RTU network.
Key Features or Benefits
Purpose-Built CO Monitoring
Electrochemical CO sensing over a 0–250 ppm range gives you the resolution needed for code-driven garage and equipment room applications.
Built-in Fan and Alarm Control
Three SPDT relays are onboard, so the transmitter itself can start exhaust fans, open dampers, or drive horns and strobes when CO hits your setpoints.
Local Display and Audible Warning
A backlit LCD shows CO levels and setup information, while an integral buzzer (around 80 dB) and front-panel LEDs make local alarms easy to see and hear, even without a separate annunciator.
Flexible Outputs
Supports 4–20 mA and standard voltage outputs (1–5 V or 2–10 V) plus RS-485 communication, so you can tie into VFDs, PLCs, stand-alone controllers, or QEL systems over a single device.
Rugged, Sealed Enclosure
NEMA 4X / IP66-rated housing protects the electronics from dust, water spray, and corrosion, making the unit a solid fit for garages, loading docks, and other harsh mechanical spaces.
Serviceable Smart-Sensor Platform
Q5C units use pre-calibrated, replaceable sensor modules, which can be swapped in the field to refresh sensor life and reduce downtime compared to pulling the whole transmitter.
Key Specs
- Gas Type: Carbon Monoxide (CO)
- Range: 0–250 ppm
- Sensor Technology: Electrochemical CO sensor
- Outputs (Electrical): 4–20 mA, 1–5 VDC, 2–10 VDC
- Relays: 3 × SPDT relays (onboard)
- Communications: RS-485 (QEL controller protocol / Modbus RTU)
- Enclosure Rating: NEMA 4X, IP66 wall-mount housing
- Power Supply: 24 VAC/VDC
- Local Indication: Backlit LCD, status LEDs, integral ~80 dB buzzer
