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CDS-2000 CO
Introduction
• Pre-Verification Information
Verification
• Equipment Needed
• Procedure
Calibration
• Single-Point Calibration
• Full Calibration
Troubleshooting
Maintenance and Repair
• Recommended Maintenance
• Servicing the Sensor
• Accessory and Replacement Data
©
1993 Johnson Controls, Inc.
Part No. 24-7691-41
Rev. —
Sensor Verification, Calibration,
2
and Troubleshooting Bulletin
Electronic Control Manual
Sensors and Stats Section
Technical Bulletin
Issue Date
216
S
CDS-2000
0393
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Summary of Contents for Johnson Controls CDS-2000
- Page 1 • Pre-Verification Information Verification • Equipment Needed • Procedure Calibration • Single-Point Calibration • Full Calibration Troubleshooting Maintenance and Repair • Recommended Maintenance • Servicing the Sensor • Accessory and Replacement Data © 1993 Johnson Controls, Inc. Part No. 24-7691-41 Rev. —...
- Page 2 2 S Sensors and Stats—CDS-2000 CO Sensor Verification, Calibration, and Troubleshooting Bulletin...
- Page 3 Before beginning the verification procedure, note the following: Pre-Verification Information • 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.
- Page 4 Modes 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.
- Page 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.
- Page 6 Procedure 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.
- Page 7 (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.
- Page 8 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.)
- Page 9 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.
- Page 10 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.
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Page 11: Troubleshooting
The flowchart below and the green LED can be used to determine what status/mode the CDS-2000 is in and how to return to the Primary mode. Use it if there is ever any confusion about what mode the sensor is in or to recover from an unsuccessful calibration attempt. -
Page 12: Maintenance And Repair
Sensor Johnson Controls branch or distributor office. Note: The CDS-2000 cannot be repaired in the field. Contact your local Johnson Controls representative to arrange for a unit replacement. If a replacement unit is required, specify the complete product code...
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