Panametrics DewPro MMR30, Руководство по установке и эксплуатации

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DewPro® MMR30 Installation & Operation Manual 27
Chapter 5. Troubleshooting
Chapter 5. Troubleshooting
5.1 Problems and Recommended Solutions
IMPORTANT: The loop current is outside the range of 4-20 mA, as shown on display or current meter. (In some cases,
22 mA can be ordered as the fault current.)
IMPORTANT: The process dewpoint is out of range. If the dewpoint is above +85°C (+185°F), the current will go to 22
mA. Apply dry air for 20 minutes. If the dewpoint doesn't decrease, consult the factory.
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If the dewpoint is below -15°C (+5°F), the current will go below 4 mA and then to 22 mA as the fault
current. Expose the DewPro to wetter for several minutes. If the error remains, the cause may be a
defective sensor assembly or an electronics malfunction. Consult the factory.
IMPORTANT: There is no current.
IMPORTANT: Check the voltage and polarity /- terminals with a DC voltmeter. If the voltage is within 12-28 V
DC, consult the factory.
IMPORTANT: The response time is very slow.
IMPORTANT: Verify the flow with an air flowmeter. If the orifice is at the outlet of a 7 to 8 bar (=100 psig) process
pressure, the air flow should indicate 20 to 30 1/h (500 cc/min., 1 cfh). If the flow is dramatically lower, the
inlet filter may be clogged. Remove the 2 micron filter and clean it with a solvent or replace it.
5.2 Removing the Filter
Figure 16 below illustrates filter parts for removal.
Retaining Ring
Orifice / Spacer
Sintered Filter
Spring Washer
Figure 16: Filter Parts