Exhaust-O-Vent Weld-O-Vent Gas Detection Systems Local Representatives
 





CM-21A Data Sheet



CARBON MONOXIDE DETECTOR AND CONTROLLER

CM-21A

Low maintenance, no periodic calibration needed
SPDT fan relay switches 5 amps
Automatic ventilation controller
Dual relays: fan (SPDT) & alarm (N.O.)
Lights reflect system status
Micro computer controlled
Long life (7 to 10 years) Solid state sensor

CM-21A is very specific to carbon monoxide (CO), avoids nuisance alarms.
CM-21A provides CO detection and automatic exhaust fan control for automotive
  maintenance facilities, enclosed parking garages, warehouses with forklifts, etc.
CM-21A meets the requirements of the Uniform Building Code for enclosed garages.
CM-21A Meets or exceeds UL 2034 standard and OSHA standards for CO exposure.
• Fan relay activates at 35 ppm of CO averaged over 5 minutes. 25 ppm is selectable.
• Alarm relay activates at 100 ppm of CO after 30 minutes or 200 ppm after 10 minutes.
• 5 amp SPDT fan relay controls starters of exhaust fans.
• 1/2 amp N.O. alarm relay connects to warning devices or control panels.
CM-21A mounts on a standard 4x4 electrical box and becomes cover for the box.
• Supervised system: any internal detector problem will cause the fan relay to activate.
• Optional calibration kit is available. One screw allows access for calibration.


Carbon monoxide exposure: ppm CO vs time
 
200 ppm
CO

100 ppm
CO

50 ppm
CO

35 ppm
CO (1)

CM-21A Fan Relay

CM-21A Alarm Relay

UL 2034 Std.

OSHA Std.

UBC Std.



      5 min.

      10 min.

      35 min.

      no std.

      60 min.



      5 min.

      30 min.

      90 min.

      no std.

      no std.



      5 min.

      none

      no std.

      8 hr TWA

      8 hr TWA



      5 min.

      none

      no std.

      no std.

      no std.


(1) This response is jumper-selectable at 25 ppm; see CM-2 1 A Operating and Installation Instructions.



Specifications:

Power: 3 watts from 12 to 24 VAC or VDC
Current: 12 V -0.25 amps, 24 V - 0.12 amps
Shipping Weight: 1 pound
Size: 4 1/2 x 4 x 2 1/8 in.
Color: gray
Connections: 7 each #20 wires, 6 inches long
Mounting box: (not included) 4x4 electric
Fan relay: 5 amp, 240 VAC, pilot duty, SPDT
Fan relay actuation: 35 or 25 ppm CO after 5 mm.
Alarm relay: 0.5 amp 200 V, 10 VA
Alarm relay actuation: 100 ppm CO after 30 mm. 200 ppm CO after 10 mm.
Operating Environ: 0 to 125 F, 10 to 90 % RH
Repeatability: 10% at 50 ppm calibration point
Linearity: 10%

Manufactured By: Macurco Inc.

Distributed By Engwald











Home | Contact Us | Exhaust-O-Vent | Weld-O-Vent | Blowers | Accessories | Gas Detection Systems | Local Representatives