Macurco CM-2B Analog Carbon Monoxide Transducer
Description
Analog CO transducer for use with HVAC/Building Automation Systems. Digital meter (0-250ppm), NEMA 1 enclosure, 24 VAC or VDC operation, 4-20ma output.
General Information
The CM-2B is a Carbon Monoxide (CO) meter and 4 to 20 ma transducer. It is an all electronic system that uses a microcomputer to measure the CO and control the digital display and analog output. The unit also has the ability to be calibrated in the field. The unit is intended for use with building automation computers or controllers, which control exhaust fans to maintain a safe environment within OSHA or building code specifications. The CM-2B sources power to the computer or controller, which needs to have a resistor at its input. The CM-2B has an isolated output circuit. This allows use of one power supply to power many detectors. See the front of the data sheet for the chart of CO versus ma, to program the computer.
Location
The unit on average can cover about 5000 sq. ft. The coverage depends on air movement in the room or facility. Extra detectors may be needed near any areas where people work or the air is stagnant. Normally, the unit mounts 5 feet above the floor, in a central area where air movement is generally good. See the CM-2B data sheet for more information on location.
Features
- General guideline on spacing: 5000 sq ft per unit.
- Locate detector 4 to 5 feet above the floor.
- The CM-2B connects to any Building Automation System accepting a 4 to 20 ma.
- The CM-2B has 1000 volt isolated output, common power buses can be used.
- Microprocessor controlled digital display and analog output.
- The CM-2B is housed in a UL knockout box, facilitating installation and hook-up.
- Low voltage operation. Power input 24 VDC or 24 VAC.
- Field Calibration Kits (CM-2B-FCK) are available.
- Works into a wide range of loads, namely 0 to 1000 ohms.
- Supervised solid-state sensor – low maintenance.
Specifications
- Power: 3.5 watts (22 to 26.5 VAC or VDC)
- Output: 4 to 20 milliamps (ma)
- Range: 0 – 250 PPM of Carbon Monoxide
- Operating Envir: 0 to 125F, 10 to 90% RH
- Repeatability: +/-10% at 50 PPM of CO
- Linearity: +/-10%
- Size: 6 X 6 X 3 inches
- Shipping Weight: 3 lbs
- Color: Gray
Additional Information
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