Union Instruments CWD 2005 User Manual (English)

Questions and Answers:

A
Adam DunnAug 5, 2025
Why do my Union Instruments Measuring Instruments have unstable readings?
- R
  rdawsonAug 5, 2025
  If your Union Instruments Measuring Instruments show unstable readings, it might be due to several factors. One cause is the pre-pressure regulator's inability to maintain constant pressure, requiring the installation of a sample gas pump. Direct sunlight causing rapid temperature fluctuations can also lead to instability, so avoid direct sunlight on the analyzer in unprotected installations. Also, air conditioning or heating units with large cooling capacity and control hysteresis can cause instability.
T
Thomas BrownAug 14, 2025
What to do if my Union Instruments Measuring Instruments show a drift in readings?
- P
  Paul TaylorAug 14, 2025
  If you observe a drift in readings with your Union Instruments Measuring Instruments, it could be due to a heavily contaminated air filter that the air fan speed can't correct. If this is the case, replace the filter element. Another potential cause is a worn-out heat exchanger. To resolve this, remove and wash the heat exchanger with warm water, using a brush for stubborn deposits. Then, dry it with compressed air before reinstalling.
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Gabrielle RamirezAug 25, 2025
How to fix incomplete ignition in Union Instruments Measuring Instruments?
- M
  Monica McintoshAug 25, 2025
  Incomplete ignition in Union Instruments Measuring Instruments can stem from several issues. It may be due to an incorrect temperature setting; in this case, either increase or decrease the temperature threshold as needed. Another cause might be a corroded ignition electrode, which is normal wear after heavy use, so replace the ignition electrode if necessary. Gas problems, such as poor, barely flammable gases, can also lead to incomplete ignition, requiring the installation of a special burner for a stable flame. Finally, if there's no ignition spark because the door is open during the ignition cycle, check the cooling airflow on the air pressure gauge and inspect the ignition transformer for continuity.

Union Instruments CWD 2005 Specifications

General

Operating temperature	-10°C to +50°C
Power supply	230 VAC, 50/60 Hz
Protection class	IP54
Resolution	0.1 %
Temperature Compensation	Automatic
Accuracy	±1% of full scale
Response time	< 5 seconds
Output signal	4-20 mA
Measuring range	CH4: 0...100 vol.%; CO2: 0...100 vol.%; O2: 0...25 vol.%; H2S: 0...2000 ppm
Communication	RS-232, optional RS-485
Measurement Range	CH4: 0-100%; CO2: 0-100%; O2: 0-25%; H2S: 0-2000ppm

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Questions and Answers:

Union Instruments CWD 2005 Specifications

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