Greystone Energy Systems CMD5B1000 Series Manuale utente

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

Carbon Monoxide Transmitter

CMD5B1000 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.

Figure 4

Figure 5

MID

LOW

RELAY TRIP

PWR

COM

OUT

R. COM

MID

LOW

RELAY TRIP

SPAN ZERO

SENSOR

CWR

Analog Input for 4-20 mA CO Signal

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

Page 3

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.

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.

Figure 6 Figure 7

PRINTED IN CANADA

Page 4

SPECIFICATIONS

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

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")

Approvals ......................................... CE, RoHS

Country of Origin..............................Canada

DIMENSIONS

85mm

3.35"

71mm

2.8"

48mm

1.9"

104mm

4.1"

Indice

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