Johnson Controls CDS-2000 Manuale utente

Electronic Control Manual 216

Sensors and Stats Section S

Technical Bulletin CDS-2000

Issue Date 0393

Part No. 24-7691-41

Rev. —

Introduction 3

•

Pre-Verification Information 3

Verification 5

•

Equipment Needed 5

•

Procedure 6

Calibration 7

•

Single-Point Calibration 7

•

Full Calibration 9

Troubleshooting 11

Maintenance and Repair 12

•

Recommended Maintenance 12

•

Servicing the Sensor 12

•

Accessory and Replacement Data 12

CDS-2000 CO

Sensor Verification, Calibration,

and Troubleshooting Bulletin

2 S Sensors and Stats—CDS-2000 CO2Sensor Verification, Calibration, and Troubleshooting Bulletin

SSensors and Stats—CDS-2000 CO2Sensor Verification, Calibration, and Troubleshooting Bulletin 3

Introduction

When properly installed, the CDS-2000 is accurate to ±100 ppm per year.

The calibration should be verified after the sensor has been in operation

for one full year and annually thereafter. Whenever an accuracy problem

is detected via the verification procedure, the sensor should be

recalibrated.

Before beginning the verification procedure, note the following:

•The CDS-2000 should be allowed to warm-up for at least one hour

before checking calibration or before calibrating. This will ensure that

the infrared sensor has reached an equilibrium temperature thereby

delivering maximum calibration accuracy.

•Recalibration of the device should not be attempted until after 14 days

of operation as the output may not have stabilized due to the drift

compensation algorithm. This variation should not be confused with

drift—it is the self-tuning of the algorithm.

•The microprocessor-based compensation algorithm is based on the

average of readings taken during a 30 minute or more “unoccupied”

period (less than 500 ppm) once every 24 hours during the previous

14 days. Readings are taken and stored in non-volatile memory. If the

power is removed, the readings will be retained.

•If after 14 days of operation the CDS-2000 appears to need

recalibration, obtain a CDS-2000-3 Calibration Kit, and perform the

single-point calibration procedure.

Pre-Verification

Information

4 S Sensors and Stats—CDS-2000 CO2Sensor Verification, Calibration, and Troubleshooting Bulletin

The CDS-2000 has four modes of operation:

•Warm-Up

•Primary

•Alarm Threshold Adjustment

•Calibration

Notes: If it is ever unclear what mode the sensor is in during an

adjustment procedure, refer to the Troubleshooting section of this

bulletin.

Pushbuttons SW-1 and SW-2, which are used to switch between

operating modes, are recessed (Figure 1) on the front of the unit.

The pushbuttons can be accessed with a small, non-metallic probe.

(A metallic probe could short-circuit the unit.) When SW-1 or

SW-2 is pressed, the green LED gives three quick flashes and a

momentary dark pause to indicate a mode change.

Modes

SSensors and Stats—CDS-2000 CO2Sensor Verification, Calibration, and Troubleshooting Bulletin 5

Verification

Before verifying or calibrating the CDS-2000, make sure that the silicone

blanket and metal clips are installed. With the duct-mounted unit

(CDS-2000-1), the blanket and clips should already be in place.

To install the silicone blanket: remove the sensor guard and wrap the

blanket around the sensor. Line up the blanket’s rubber dimples with the

holes on the sensing chamber and press down firmly. Fasten the blanket in

place with the metal clips provided. Refer to Figure 1 for proper

placement of the blanket on the sensor.

verify.drw

SW-2

Mounting Clips

Tubing Adapter

1/4 in. ID

Tubing

Green LED

Wiring Access

Silicone Blanket

Zero

Adjustment SW-1

Regulator

Alarm Threshold

Adjustment

with Gage

Figure 1: Verifying Operation of the CDS-2000

•a digital voltmeter with 10 mVDC resolution over a range of at least

0 to 10 VDC

•the CDS-2000-3 Calibration Kit which includes:

— a source of air with a known concentration of CO2between

400 and 1200 ppm (bottled gas)

— a regulator with gage (see Figure 1) that can maintain flow at

400 to 800 ml/min. (24 to 48 SCIM)

— silicone blanket with mounting clips, tubing adapter, and tubing

Equipment Needed

6 S Sensors and Stats—CDS-2000 CO2Sensor Verification, Calibration, and Troubleshooting Bulletin

1. Disconnect the source of power to the CDS-2000.

2. Connect a Digital Voltmeter (DVM) between Terminals 1 (-) and

2 (+) at the terminal block on the back of the CDS-2000, and

power-up the unit.

3. Allow the CDS-2000 approximately one hour to warm-up. In the first

few minutes of the warm-up, the green LED on the front of the unit below

the sensor will remain dark. After a few minutes the green LED will flash

continuously, which indicates that the unit is in the Primary mode. The

unit will be ready for verification once the one-hour warm-up period is

over. (The green LED will still be flashing.)

While the unit is warming up, check the CO2concentration of the

bottled gas, (from its label) and determine the corresponding voltage

level by dividing the ppm value by 200.

Example: A 1000 ppm CO2concentration corresponds to 5 VDC

(1000/200).

4. Attach the regulator to the gas bottle, and connect tubing to the

regulator outlet. Attach the other end of the tubing to the tubing

adapter, and firmly place it into the port extending from the blanket as

shown in Figure 1. With the CDS-2000 in the Primary mode, slowly

adjust the regulator to flow air from the gas bottle through the tubing

and into the sensor. The regulator in the Calibration Kit will deliver

500 ml/min. of gas at 10 PSI. The tank can maintain this flow for

two minutes.

CAUTION: To avoid depleting the gas, slowly open the regulator

valve. Close the valve as soon as verification is

complete.

5. Compare the voltage reading on the DVM to the value determined in

Step 3. If the two voltage levels differ by more than ±0.5 volts,

proceed to the single-point calibration instructions that follow.

6. Reconnect the flow pickup device if using the duct-mounted

CDS-2000-1 sensor. Remove the silicone blanket and metal clips if

using the CDS-2000-2.

Procedure

SSensors and Stats—CDS-2000 CO2Sensor Verification, Calibration, and Troubleshooting Bulletin 7

Calibration

The Calibration mode has two sub-modes: the Single-Point mode, which

is only for adjustment of the offset, and the Full Calibration mode, which

is for adjustment of the span and offset. The Calibration modes cannot be

used to verify settings. To verify the settings, refer to the Verification

section.If the alarm threshold needs verification, refer to the Adjusting the

Alarm Threshold section in the CDS-2000 Series Carbon Dioxide Sensors

Technical Bulletin. Always use the verification procedure in this bulletin

to check operation before calibrating the sensor.

•a digital voltmeter with 10 mVDC resolution over a range of at least

0 to 10 VDC

•a small (0.07 in. or less), flat-blade jeweler’s screwdriver

•a non-metallic probe for accessing the pushbuttons

•the CDS-2000-3 Calibration Kit, which includes:

— a source of air with a known concentration of CO2between

400 and 1200 ppm

— a regulator that can maintain flow between 400 to 800 ml/min.

(24 to 48 SCIM)

— a calibration blanket with mounting clips, adapter, and tubing

To do a single-point calibration, perform the following steps:

1. Disconnect the power supply to the unit. Connect a Digital Voltmeter

(DVM) between Terminal 2 (-) and Terminal 1 (+) at the terminal block

on the back of the CDS-2000, and power up the unit.

2. Allow the CDS-2000 approximately one hour to warm-up. In the first

few minutes of the warm-up, the green LED on the front of the unit below

the sensor will remain dark. After a few minutes, the green LED will flash

continuously, which indicates that the unit is in the Primary mode. The

unit will be ready for calibration once the one-hour, warm-up period is

over. (The green LED will still be flashing.)

3. Using a non-metallic probe, press and hold down the recessed SW-1

button, until the green LED gives three quick flashes and goes dark; then,

immediately release the button. The sensor is now in the Calibration

mode, and the LED remains off.

Single-Point

Calibration

Equipment Needed

Procedure

8 S Sensors and Stats—CDS-2000 CO2Sensor Verification, Calibration, and Troubleshooting Bulletin

4. Press and hold down SW-1 again until the LED gives three quick

flashes; then, immediately release the button to switch the unit into the

Single-Point Calibration mode. The voltage reading on the DVM will

indicate approximately 2 VDC (400 ppm), and the LED remains off.

CAUTION: If the SW-2 button is accidentally pressed at this

point, the span setting is permanently erased, and

the sensor must be recalibrated using the Full

Calibration Mode procedure and bottled gas at 2000

ppm of CO2.

5. Check the CO2concentration of the bottled gas, and determine the

corresponding voltage by dividing the ppm value by 200. (For

example, a 1000 ppm CO2concentration corresponds to 5 VDC

(1000/200). Press SW-1 until reading at the DVM corresponds with

the value calculated.

Note: Repeatedly pressing SW-1 increases the voltage in 0.1 VDC

(20 ppm) increments up to 6 VDC (1200 ppm). Continuously

holding down SW-1 causes the voltage to increment from

2 to 6 VDC in cycles. If SW-1 is held long enough, the voltage

will increment back to 0, and so on.

6. Use tubing to connect the bottled gas to the CDS-2000 as shown in

Figure 11. (Refer to the instructions in the Verification—Procedure

section as needed.)

7. Press SW-2, and slowly adjust the regulator valve (pressure gage at

10 PSI) to flow gas into the sensor. Continue the gas flow until a

stable reading is reached at the DVM. The gas will flow at

500 ml/min. for about 2 minutes with the regulator at 10 PSI.

8. When a stable reading is achieved (not necessarily the calculated

voltage), press SW-1 to return the unit to the Primary mode. The LED

now flashes continuously indicating that the CDS-2000 has resumed

operation using the new settings. The reading at the DVM should be

the same value (within ±0.1 volts) as that calculated in

Step 4.

9. Disconnect the DVM. Reconnect the flow pickup device if using the

CDS-2000-1. Remove the silicone blanket and metal clips if using the

CDS-2000-2.

SSensors and Stats—CDS-2000 CO2Sensor Verification, Calibration, and Troubleshooting Bulletin 9

•a digital voltmeter with 10 mVDC resolution and a range of at least

0 to 10 VDC

•a small (0.07 in. or less), flat-blade jeweler’s screwdriver

•a small, non-metallic probe for accessing the pushbuttons

•a source of dry nitrogen gas from which all CO2has been removed

(0 ppm)

•a source of air with a known concentration of 2000 ppm

(±40 ppm) CO2

•a regulator that can maintain flow between 400 and 800 ml/min.

(24 to 48 SCIM)

•a silicone blanket and tubing

Use the following procedure only when it is necessary to completely reset the

sensor’s offset and span.

CAUTION: Make sure bottled gas at 2000 ppm CO2and a bottle

at 0 ppm CO2concentration is available before

beginning calibration. The previous span setting is

automatically erased when the Full Calibration Mode

procedure is initiated.

1. Connect the Digital Voltmeter (DVM) between Terminal 8 (+) and

Terminal 2 (-) on the terminal block (back of the unit). Power up the

unit.

2. Allow the CDS-2000 approximately one hour to warm-up. In the

first few minutes of the warm-up, the green LED on the front of the

unit below the sensor will remain dark. After a few minutes, the green

LED will flash continuously, which indicates that the unit is in the

Primary mode. The unit will be ready for verification once the one-

hour warm-up period is over. (The green LED will still be flashing.)

3. Using a non-metallic probe, press and hold down the recessed

SW-1 button until the green LED gives three quick flashes and goes

dark; then, immediately release the button. The unit is now in the

Calibration mode, and the LED remains off.

4. Press and hold down the SW-2 button (to the right of SW-1, see

Figure 1) until the LED gives three quick flashes and a momentary

dark pause; then, immediately release the button to switch the unit into

the Full Calibration mode (LED will be flashing continuously).

Full Calibration

Equipment Needed

Procedure

10 S Sensors and Stats—CDS-2000 CO2Sensor Verification, Calibration, and Troubleshooting Bulletin

5. Use tubing to connect the 0 ppm gas to the CDS-2000’s tubing port

shown in Figure 1. (Refer to the instructions in the Verification—

Procedure section as needed.) Slowly adjust the regulator valve to

flow gas into the sensor. Continue flowing the gas until a stable

reading is reached at the DVM. (This will take about 2 minutes at

500 ml/min.) When a stable reading is achieved at the DVM, use the

small-blade screwdriver to slowly adjust the recessed zero

adjustment potentiometer (to the left of SW-1, see Figure 1) until the

DVM reads between 2.75 and 2.85 VDC. Turn Clockwise (CW) to

decrease or Counterclockwise (CCW) to increase.

Note: A 0.2 V, 1 Hz signal is superimposed on the DC level. The

2.8 VDC value should correspond with the highest of the two

values, which alternate on the DVM readout.

6. Press the SW-1 button until the LED gives three quick flashes and a

momentary dark pause (the LED will then flash continuously).

Release the button, and flow 2000 ppm CO2gas into the sensor until

a stable reading is reached (between 0.4 and 0.8 volts).

7. When a stable reading is achieved (will take about 2 to 3 minutes),

press the SW-1 button to return the unit to the Primary mode (LED

flashes continuously). If the 8 (+) lead of the DVM is moved to

Terminal 1 at this point, the DVM should read between 9.5 and 10.5

VDC. (If not, refer to the Troubleshooting section.) Disconnect the

DVM.

8. Reconnect the flow pickup device if using the CDS-2000-1. Remove

the silicone blanket and metal clips if using the CDS-2000-2.

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