Dwyer Instruments CMT200 Instructions d'installation et d'utilisation

Model CMT200 Carbon Monoxide Transmitter

Specications - Installation and Operating Instructions

Bulletin AQ-CMT200

The Model CMT200 Carbon Monoxide Transmitter provides a eld selectable

current or voltage output that is proportional to the gas concentration in underground

parking garages, vehicle maintenance facilities, or mechanical rooms. A eld

replaceable, electrochemical sensor provides accurate readings for up to 4 years

with proper calibration. Field calibration can be done by using Model GCK-200CO-

2000CO2 calibration gas, Model A-507A calibration adapter, and the on board span

and zero potentiometers.

CMT200

CMT200-R

SPECIFICATIONS

Sensor: Field replaceable electrochemical, 4 year typical lifespan.

Range: 0 to 200 ppm.

Output Drift: <5% per year in air.

Coverage Area: 5000 to 7000 sq. ft. typical.

Accuracy: ±2% FS at the time of calibration.

Temperature Limits: -4 to 122°F (-20 to 50°C).

Storage Temperature: For best sensor life, 32 to 68°F (0 to 20°C).

Humidity Limits: 15 to 90% RH constant; 0 to 99% RH intermittent.

Response Time: <45 seconds to 90% of nal value.

Calibration: 15 turn span and zero adjustment potentiometers.

Housing: UV resistant polycarbonate.

Output: Jumper selectable 4 to 20 mA (loop powered) or 2 to 10 V (load must be

>50 KΩ).

Power Requirements: Current Output: 18 to 28 VDC; Voltage Output: 18 to 28 VDC/

VAC, reverse polarity protected.

Electrical Connection: Removable terminal block, add two PG11 and one PG 16

knockouts for conduit tting.

Weight: 0.28 lb (0.11 kg).

Agency Approvals: CE.

Ø1-5/64

[27.317]

Ø3-1/4

[82.713]

1-31/32

[50.196]

1-37/64

[39.891]

3-9/64

[79.781]

2-21/64

[59.073]

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 of wrist straps)

during installation and wiring to prevent equipment damage.

Avoid locations where severe 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 to 20 mA wiring

congurations are not designed for AC voltage operation.

CAUTION

2-15/64

[56.75] 3-45/64 [94.06]

3-1/8 [79.38]

4-17/32

[115.09]

5-7/64

[129.78]

21/64

[8.33]

1-5/64

[27.38]

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

e-mail: [email protected]

WIRING

Use maximum 18 AWG wire for wiring terminals. Refer to Figure 1 or Figure 2 for

wiring information. The terminal block is removable for ease of installation.

4 to 20 mA Output

Before wiring for 4 to 20 mA output, check that the jumper P1 is connected so that the

jumper is on the two pins furthest from the terminal block as shown in gure 1. 4 to

20 mA output may be powered by 18 to 28 VDC. The transmitter is reverse polarity

protected. The load must not exceed the maximum loop resistance, Rmax, listed on

the next page. The load and power supply should be connected according to Figure 1.

Max Loop Resistance

For 4 to 20 mA Outputs

The maximum allowable loop resistance depends on the power supply voltage.

Maximum loop voltage drop must not reduce the transmitter voltage below the 18 VDC

minimum. Maximum loop resistance can be calculated with the following equation. Vps

is the power supply voltage.

Rmax = Vps – 18

20 mA

Some receivers, particularly loop powered indicators, may maintain a xed loop

voltage to power the device. This voltage drop must also be subtracted from the power

supply voltage when calculating the voltage margin for the transmitter. The following

equation takes this into account. Vrec is the receiver xed voltage.

Rmax = Vps – 18 – Vrec

20 mA

2 to 10 VDC Output

Before wiring for 2 to 10 VDC output, check that the jumper P1 is connected so that

the jumper is on the two pins closest to the terminal block as shown in gure 2. 2 to

10 VDC output may be powered by 18 to 28 VAC or VDC. The transmitter is reverse

polarity protected. The load must be greater than 50 KΩ. The load and power supply

should be connected according to Figure 2.

POWER

SUPPLY

RECEIVER P1 JUMPER SE

FOR CURRENT

VOLTAGE OUTPUT - WIRING AND P1 SETTING

SPAN ZERO

3 2 1

Figure 2

Figure 1

P1 JUMPER SE

FOR CURRENT

CURRENT OUTPUT - WIRING AND P1 SETTING

POWER

SUPPLY

RECEIVER

SPAN ZERO

3 2 1

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. Twist the lid a quarter turn and pull the lid from the base housing.

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 hole

located in the center of the housing base.

4. Drill or punch out marked locations.

5. Place the transmitter on the wall and align the mounting hole. Install the

transmitter using the included screw and washer through the mounting hole.

6. Set the jumper selection for current or voltage output.

7. Proceed with the wiring according to diagrams in gures 1 and 2.

8. Replace the cover.

The electrochemical sensors should be stored in an environment

with a minimum humidity level of 20% RH. If the sensor dries out,

replacements will not be covered under warranty, but they can be revived by allowing

them to stabilize in an environment above 40% RH for 10 days. Once revived, they

need to be recalibrated before use.

These are general guidelines. Local laws or ordinances will take

precedence.

NOTICE

CALIBRATION

Calibration of the Model CMT200 requires an A-507A calibration adapter, model GCK-

200CO-2000CO2 calibration gas, a multimeter, and a small at head screw driver.

1. Turn off power to the transmitter.

2. Remove the lid from the housing by twisting it a quarter turn and pulling off.

3. Replace the receiver shown in gure 1 or 2 with a multimeter and restore the

power to the transmitter.

4. Attach the tubing from the zero calibration gas to the A-507A calibration adapter.

5. Securely attach the A-507A to the CMT200 as shown in gure 3.

6. Allow the calibration gas to ow at a rate of 0.5 to 1.0 slpm for at least 3 minutes.

7. Adjust the zero potentiometer (blue) until the output reading on the multimeter

reads 4 mA or 2VDC (depending on output selection).

8. Repeat steps 4 through 6 using the span calibration gas.

9. Adjust the span potentiometer (grey) until the output reading on the multimeter

reads 20 mA or 10 VDC (depending on output selection).

10. Turn off the power to the transmitter.

11. Replace the multimeter with the receiver as shown in gures 1 and 2 and

restore the power to the transmitter.

12. Remove the A-507A calibration adapter.

13. Replace the lid on to the transmitter.

Sensor Replacement

A replacement sensor is available from Dwyer Instruments, Inc. Order part number

A-505 for a replacement CO sensor.

1. Turn off power to the transmitter and remove the terminal block from the circuit

board.

2. Remove the two screws in the circuit board mounting bracket shown in Figure 4.

3. Gently slide the circuit board and sensor out of the sensor guard.

4. Remove sensor by gently pulling the sensor straight out of its sockets.

5. Install the new sensor by gently pressing the pins of the sensor into the sockets in

the circuit board.

6. Slide the sensor and circuit board back into the sensor guard and align the

mounting holes on the circuit board brackets with the holes on the housing.

7. Reattach the circuit board bracket to the housing and the terminal block to the

circuit board.

8. Go through the calibration procedures in the calibration section.

MAINTENANCE/REPAIR

Upon nal installation of the Model CMT200 Transmitter, no routine maintenance is

required with the exception of calibration. As with all electrochemical type gas sensors,

routine calibration is required. It is recommended that units be re-calibrated at 6 month

intervals, to maintain the published accuracy, or as required by local ordinances or

other requirements. The units will maintain 5% accuracy if they are re-calibrated at 12

month intervals.

Except for sensor replacement and calibration, the Model CMT200 is not eld

serviceable and should be returned if repair is needed (eld repair should not be

attempted and may void warranty). Be sure to include a brief description of the

problem plus any relevant application notes. Contact customer service to receive a

return goods authorization number before shipping.

Figure 3 Figure 4

CMT200

CMT200-R

Zero adjustment

Span adjustment

Circuit board

mounting

bracket screw

Circuit board

mounting

bracket screw

If the span potentiometer on the Model CMT200 cannot restore the

output to 20 mA, the sensor will need to be replaced.

When replacing the sensor, reset each potentiometer position to

the middle of the range before adjusting the calibration.

NOTICE

This symbol indicates waste electrical products should not be disposed

of with household waste. Please recycle where facilities exist. Check with

your Local Authority or retailer for recycling advice.

NOTES

__________________________________________________________________________________________________________________________________________

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.

Phone: 219/879-8000

Fax: 219/872-9057

dwyer-inst.com

e-mail: [email protected]

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