Alpha Moisture Systems dewTEC DS2000, Инструкция по эксплуатации

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6.0 Maintenance and Troubleshooting
6.1 Maintenance
The
dew TEC DS2000 front panel can be wiped clean when necessary with a damp soft cloth.
The hygrometer contains no user serviceable parts. Do not open the unit. The rear of the unit
can be dusted with a dry cloth if necessary. Ensure that no voltages are present on the rear
terminal when this is done.
The sensor body may be wiped down with a dry cloth. Do not attempt to clean the sensor
element as it may be damaged.
6.2 Problem Guide
(To be checked in a safe area by a technician experienced in handling similar equipment)
Problem Cause Solution
Display reads
Sensor cable or plug short
circuit.
Short Circuit Sensor
Instrument unserviceable
Autocal wrongly set
Disconnect the sensor cable plug from the sensor and
if the hygrometer still reads the same, repair the short
circuit in the cable or plug.
Disconnect the sensor cable plug from the sensor. If
the display now indicates
or zero. Apply
approximately 24V DC to the sensor terminals
MOMENTARILY with the sensor in a dry condition.
Polarity is not important, but the contact must be brief
or the sensor will be destroyed. If this fails to clear the
fault, the sensor must be replaced.
Disconnect sensor cable from the instrument. If
reading does not change, return instrument for service.
Re adjust autocal as described in this manual.
Display reads
Wet Gas or free water in system
Autocal wrongly set
Stop gas supply and switch instrument off. Check
drain and inspection ports in the main system and
sample system.
Re adjust autocal as described in this manual.
Display reads
or zero continuously
Open circuit cable
Open circuit sensor
Instrument unserviceable
Disconnect sensor cable and check continuity. Repair
or replace cable.
Check continuity to body of sensor. Disconnect sensor
cable. Short circuit cable terminals and if display
indicates
, replace sensor.
Disconnect sensor. Short circuit cable terminals and if
display does mot indicate
,
return instrument
for service.
Wet Reading Leak in system or sue of
unsuitable pipe
Comparison with Secondary
Standard Instrument or
Calibration Gas Cure the leak or replace unsuitable pipe with copper or
stainless steel. Flexible connection should be made
with PTFE pipe. NEVER use rubber or plastic pipe.
Ensure that samples are taken from same sample point.
Re-check Autocal setting. If problems still occur re-
calibration of the system is recommended
dewTEC DS2000 User’s Manual Page 20