Model CMS300 Carbon Monoxide Transmitter and Switch
Specications - Installation and Operating Instructions
Bulletin AQ-CMS300
The Model CMS300 Carbon Monoxide Transmitter and Switch provides a eld
selectable current or voltage output that is proportional to the carbon monoxide
concentration in underground parking garages, vehicle maintenance facilities, or
mechanical rooms. An integral relay can be used for alarm conditions and is congured
with preset jumper selectable ranges of 25, 60, or 150 PPM. Field calibration can
be done by using Dwyer Instruments Model GCK-200CO-2000CO2 calibration gas,
Model A-507 calibration adapter, and the on-board zero and span potentiometers.
INSTALLATION
• The transmitter should be mounted at normal breathing height, approximately 5 to
6 ft above the oor.
• The unit may be mounted in the horizontal or vertical position. It should be
mounted in an area that is shielded from direct contact with the elements or direct
sunlight.
• Mount in an area that will prevent the sensor from having any direct contact with
water.
• The unit should be placed in an area that will give an average of the air quality. Do
not place the unit so it will receive direct engine exhaust. Prolonged exposure to
direct engine exhaust may damage the sensor.
MOUNTING
1. Remove the cover plugs from the face of the unit and the top cover.
2. Remove the desired conduit tting knock out and install conduit tting (not
provided).
3. Position the transmitter where it is to be mounted and mark the mounting holes in
each corner of the housing.
4. Drill or punch out marked locations.
5. Place the transmitter box over mounting holes on wall and align. Install wall mount
screws (not provided) in mounting holes.
6. Proceed with all wiring according to Figures 1 through 4.
7. Replace cover and cover plugs on the face of the unit.
SPECIFICATIONS
Sensor: Electrochemical, 5 years typical lifespan.
Range: 0-300 PPM.
Output Drift: <5% per year in air.
Temperature Effect: ±2% over range.
Coverage Area: 7,500 ft2 (700 m2) or 50 ft (15 m) radius.
Accuracy: ±5 PPM or 5% of reading for 0-300 PPM (whichever is greater).
Resolution: 1 PPM.
Temperature Range: -4 to 122°F (-20 to 50°C).
Storage Temperature: For best sensor life, 32°F to 68°F (0 to 20°C).
Humidity Range: 15-90% RH constant; 0-99% RH intermittent.
Response Time: <45 s to 90% of nal value.
Calibration: 15 turn span and zero adjustment potentiometers.
Housing: UV resistant glass lled polycarbonate.
Analog Output: Jumper selectable 4-20 mA (loop powered) or 2-10 V (max. load
2 kΩ).
Enclosure Rating: IP64.
Switch Type: Single-pole double-throw (SPDT).
Relay Electrical Rating: 30 VDC, 250 VAC. N/O=5 A. N/C=3 A resistive.
Set Point: Jumper selectable 25, 60, or 150 PPM.
Set Point Differential/Hysteresis: 3% of scale.
Relay Action: Factory set for direct acting.
Weight: 1 lb (0.45 kg).
Compliance: Sensor is UL recognized component for ANSI/UL-2034, UL-2075,
E340403, CE.
These are general guidelines. Local laws or ordinances will
take precedence.
NOTICE
Disconnect power supply before installation to prevent electrical
shock and equipment damage. Make sure all connections are in
accordance with the job wiring diagram and national and local electrical codes. Use
copper conductors only.
WARNING
Use electrostatic discharge precautions (e.g., use wrist straps)
during installation and wiring to prevent equipment damage.
Avoid locations where mechanical shock or vibration, excessive
moisture or corrosive fumes are present.
Do not exceed ratings of this device; permanent damage not
covered by warranty may result. The 4-20 mA wiring congurations
are not designed for AC voltage operation.
CAUTION
CAUTION
CAUTION
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: 219-879-8000
Fax: 219-872-9057
www.dwyer-inst.com
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MOUNTING HOLES
