Troubleshooting
5-1
November 2005
Problems and
Recommended Solutions
Problem:
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:
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, consult the factory.
If the dewpoint is below -90°C (-130°F), the current will
go below 4 mA and then to 22 mA as fault current.
Expose the DewPro to ambient air for several minutes. If
the error remains, the cause may be a defective sensor
assembly or an electronics malfunction. Consult the
factory.
Problem:
There is no current.
Solution:
Check the voltage and polarity /- terminals with a
DC voltmeter. If the voltage is within 12-28 VDC,
consult the factory.
Problem:
The response time is very slow.
Solution:
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.
Removing the Filter
Figure 5-1 below shows a breakdown of filter parts for removal.
Figure 5-1: Filter Parts
Содержание DewPro MMY30
Страница 1: ...GE Sensing DewPro MMY30 General Eastern Trace Moisture Transmitter User s Manual ...
Страница 6: ...Chapter 1 ...
Страница 13: ...Chapter 2 ...
Страница 19: ...Chapter 3 ...
Страница 24: ...Chapter 4 ...
Страница 34: ...Chapter 5 ...
Страница 35: ...Troubleshooting Problems and Recommended Solutions 5 1 Removing the Filter 5 1 ...
Страница 37: ...Chapter 6 ...
Страница 38: ...Technical Specifications MMY30 Specifications 6 1 Optional Onboard Display with User Interface 6 2 ...
Страница 41: ...Appendix A ...
Страница 42: ...User Interface Matrix Input ...