Greystone Energy Systems CMD5B1 010 Series User manual

Page 1
INTRODUCTION
The Carbon Monoxide Transmitter uses an
electrochemical sensor to monitor the CO
level and outputs a proportional 0-10 Vdc
signal. The device may also be congured with
an alarm relay.
BEFORE INSTALLATION
Read these instructions carefully before installing and commissioning the CO transmitter. Failure to follow
these instructions may result in product damage. Do not use in an explosive or hazardous environment,
with combustible or ammable gases, as a safety or emergency stop device or in any other application
where failure of the product could result in personal injury. Take electrostatic discharge precautions
during installation and do not exceed the device ratings.
MOUNTING
The transmitter should be mounted on a at surface three to ve feet from the oor of the area to be
controlled. Do not mount the sensor near doors, opening windows, supply air diusers, or other known air
disturbances. Avoid areas with vibrations or rapid temperature changes.
The transmitter has two integrated mounting tabs on either side of the enclosure that facilitate a #10 size
screw (not supplied). See Figure 1.
Remove the cover from the enclosure by loosening
4 Phillips screws in each corner of the enclosure as
seen in Figure 2.
Complete wiring instructions on page 2. Re-install
the cover and tighten the screws with a Phillips
screwdriver. See Figure 3.
Figure 1
Figure 3Figure 2
IN-GE-CMD5B1XXX010-002 Copyright © Greystone Energy Systems, Inc. All Rights Reserved Phone: [phone] Web: www.greystoneenergy.com
Carbon Monoxide Transmitter
with 0-10 Vdc Output
CMD5B1XXX010 Series - Installation Instructions

Page 2
WIRING
Use 22 AWG shielded wire for all connections and do not locate the device wires in the same conduit with
wiring used to supply inductive loads such as motors. Disconnect the power supply before making any
connections to prevent electrical shock or equipment damage. Make all connections in accordance with
national and local codes.
Connect either an AC or DC power supply to POWER and COMMON and the 0-10 Vdc signal is available
on the OUTPUT terminal with respect to COMMON as shown in Figure 4. The device is reverse voltage
protected and will not operate if the power supply is connected backwards.
Ensure the controller Analog Input (AI) matches the transmitter output signal type before power is applied.
The output signal has a minimum load that it will drive, follow the ratings in the Specication section or
inaccurate readings may result.
If equipped, the relay output is available on the NO, NC and R.COM terminals. The relay R.COM terminal is
NOT connected to the signal or power supply COMMON terminal. The relay output is completely isolated
and has both Normally Open (NO) and Normally Closed (NC) signals. These signals can be used to directly
control alarms, ventilation fans or may be connected to digital inputs of the B.A.S. for status monitoring.
OPERATION
In normal operation the sensor will measure the CO level in the
surrounding air and output a proportional value on the 0-10 Vdc
output.The CO measurement range is 0-300 ppm. An optional relay can
be used to indicate an alarm condition. The trip point for the relay can
be programmed to three dierent settings with an on-board jumper as
shown in Figure 5. If the CO level exceeds the trip point then the relay is
activated. The relay will remain activated until the CO level drops below
the (trip level – hysteresis) where hysteresis is 3% or 9 ppm.
STARTUP
Verify that the Carbon Monoxide Transmitter is properly wired according to the wiring diagrams and all
connections are tight. Apply power to the device and the sensor will begin reading the CO level and output
the analog signal.
CALIBRATION
The transmitter features a simple snap-mount sensor pcb that is pre-calibrated. This means that the entire
sensor pcb can simply be replaced with a new calibrated pcb if desired without having to remove the
enclosure. This sensor swap requires no tools and can be completed in seconds. Simply disconnect the
device wiring, remove the old sensor pcb, snap in the new pcb and reconnect the device power. There is
no need to make any adjustments or apply gas to the transmitter using the sensor swap method.
The device may also be calibrated or veried with CO gas if required. This requires a eld calibration kit
consisting of a bottle of gas (250 ppm CO in air for example), a tank pressure regulator with ow restrictor
and the necessary tubing with a calibration cap to cover to the sensor. Calibration can be done at 20-27 °C.
Figure 4
Figure 5
Analog Input for 0-10 Vdc CO Signal
HI
MID
LOW
RELAY TRIP
PWR
COM
OUT
NO
NC
R. COM
HI
MID
LOW
RELAY TRIP
SPAN ZERO
CO
SENSOR
CWR
Controller
24 Vac Power
Analog Input for
0-10 Vdc CO signal
Hot
Com
PWR
COM
OUT
+
Controller
24 Vdc Power
PWR
COM
OUT
Analog Input for
0-10 Vdc CO signal
IN-GE-CMD5B1XXX010-002 Copyright © Greystone Energy Systems, Inc. All Rights Reserved Phone: [phone] Web: www.greystoneenergy.com

Page 3
Verication with gas can be done without removing the device cover. Simply apply gas using the calibration
cap attached directly to the port on the cover as shown in Figure 6 and monitor the output signal.
The device cover must be removed to perform an actual calibration. In this case, the gas calibration cap
attaches to the sensor xture inside the enclosure as shown in Figure 7. The sensor must be continuously
powered for at least 1/2 hour prior to calibration. Calibrate the sensor rst in clean air with no CO gas
present. Simply adjust the ZERO pot on the sensor board until a 0 Vdc output is obtained. For this case,
adjust the output slightly above 0 Vdc and then slowly reduce the output signal to 0 Vdc. The output signal
may be monitored with a voltmeter connected to the OUTPUT and COMMON terminals.
Then attach the gas supply. Turn the regulator on/o knob fully o and attach it to the 250 ppm gas bottle
and rmly tighten it by hand. Moisten the sponge and squeeze out any excess water. Place the sponge
in the cap so that it will not touch the sensor but does not plug the hole in the side of the cap. Attach the
cap to the xture over the sensor. Slowly turn the valve knob on the regulator to let the gas begin owing.
The regulator will restrict the ow rate to the specied 200 ml/min and the sponge will ensure the gas is
in the right humidity range. Wait for 5 minutes and then adjust the SPAN pot on the sensor board until the
output reads 250 ppm. For the 0-300 ppm device span, 250 ppm would equal 8.33 Vdc. Close the valve on
the tank and take the cap o from the sensor. Calibration is complete.
If the gas cap is too loose on the xtures, simply place a wrap of electrical tape around the cap to tighten it.
DIMENSIONS
85mm
3.35"
71mm
2.8"
48mm
1.9"
104mm
4.1"
Figure 6 Figure 7
IN-GE-CMD5B1XXX010-002 Copyright © Greystone Energy Systems, Inc. All Rights Reserved Phone: [phone] Web: www.greystoneenergy.com

PRINTED IN CANADA
Page 4
SPECIFICATIONS
GENERAL
Measurement.................................. Electrochemical
Sample Method ............................. Diusion
Measurement Range.................... 0 to 300 ppm
Accuracy ........................................... ±5 ppm or ±5% of reading (whichever is greater)
0 to 50°C (32 to 122°F), 15 to 90 %RH
Agency Approvals......................... Senor is UL recognized for ANSI/UL-2034 and UL-2075, E240671
Operating Conditions .................. -20 to 50°C (-4 to 122°F), 15 to 90 %RH, 0.9 - 1.1 atm
Stability ............................................. <5% signal loss/year
Response Time ............................... <35 seconds for 90% step change
Life Expectancy .............................. 7 years
Typical Area Coverage ................. 700 m2(7500 ft2) or 15m (50ft) radius
Power Supply.................................. 24 Vdc ±20% or 24 Vac ±10% (non-isolated half-wave rectied)
Consumption.................................. Relay Model: 40 mA max
Non-relay Model: 20 mA max
Output Signal.................................. 0-10 Vdc
Output Drive Capability.............. 10K Ω min
Optional Relay Contacts ............. Form C contacts (N.O. and N.C.), 5 Amps @ 250 Vac, 5 Amps @ 30 Vdc
Relay Trip Point............................... 25, 60 or 150 ppm jumper selectable
Relay Hysteresis.............................. 3% or 9 ppm
Wiring Connections...................... Screw terminal block (14 to 22 AWG)
Enclosure.......................................... Polycarbonate or ABS, UL94-V0, IP65 (NEMA 4X)
71mm W x 104mm H x 48mm D (2.8" x 4.1" x 1.9")
Country of Origin..............................Canada
IN-GE-CMD5B1XXX010-002 Copyright © Greystone Energy Systems, Inc. All Rights Reserved Phone: [phone] Web: www.greystoneenergy.com