Panametrics DewPro MMY30, Руководство пользователя, Страница: 33 / 43

DewPro
®
MMY30 User’s Manual 25
Chapter 5. Troubleshooting
Chapter 5. Troubleshooting
5.1 Problems and Recommended Solutions
Problem 1: 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.
Solution 1: The process dewpoint is out of range. If the dewpoint is above +10°C (+50°F), the current will go to
22 mA. Apply dry air for 20 minutes. If the dewpoint doesn't decrease, contact Panametrics.
If the dewpoint is below –90°C (–130°F), the current will go below 4 mA and then to 22 mA as the fault
current. Expose the DewPro MMY30 to ambient air for several minutes. If the error remains, the cause may
be a defective sensor assembly or an electronics malfunction. Contact Panametrics.
Problem 2: There is no current.
Solution 2: Check the voltage and polarity across the +/– terminals with a DC voltmeter. If the voltage is between
12 VDC and 28 VDC, contact Panametrics.
Problem 3: The response time is very slow.
Solution 3: 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.). If the flow is significantly lower, the inlet
filter may be clogged. Remove the 2-micron filter and clean it with a solvent or replace the filter.
5.2 Removing the Filter
Refer to Figure 16 below to remove the filter for cleaning or replacement.
Figure 16: Filter Components
Orifice/Spacer
Sintered Filter
Spring Washer
Retaining Ring