Field Service Guide - Sigma HRD Serie Manual De Instrucciones

ducer is faulty it must be replaced. The dryer will con-
tinue to operate when this indicator is lighted.
PRESSURE
80 psig
100 psig
120 psig
Temperature Sensor
The front panel sensor malfunction indicator will flash
if this sensor fails. The Compu-Purge will default to a
fixed 100°F inlet temperature signal and continue to
operate in the Variable Purge Mode. Output of the sen-
sor can be checked on the control board at connector
CON 6. Using a DC voltmeter, attach the negative lead
to Pin 1, positive lead to Pin 2.
TEMPERATURE DC VOLTAGE
32°F
104°F
The LCD display will indicate the following error
codes:
1.
32°F — TEMPERATURE SENSOR MALFUNCTION
Indicates a short circuit condition across the sen-
sor.
2.
390°F — TEMPERATURE SENSOR MALFUNCTION
Indicates possible transducer or control board
malfunction or temperature is out of calibration
range of 33°F – 284°F.
3.
750°F — TEMPERATURE SENSOR MALFUNCTION
Indicates sensor is unplugged (CON 6) or an open
circuit condition exists.
1-20
TRANSDUCER OUTPUT
20.020 MV
25.050 MV
30.030 MV
OHMS
1.331 1854
1.482 2153

FIELD SERVICE GUIDE

WARNING
Compressed air can be dangerous unless
safety precautions are observed in the use of
c o m p re s s e d a i r a n d c o m p re s se d a i r
equipment. Completely vent the internal air
p re s s u re t o t h e a t m o s p h e r e b e f o r e
disassembling any piping, fittings, valves or
other components and before doing any work
on compressed air equipment. To vent internal
air pressure, follow the shutdown instructions
on page 1-12.
HRD and HRD-EM Series (Bulletin 378)