Parker CDAS HL 050 - Page 31

4-20mA Dewpoint Retransmission
e CDAS HL / OFAS HL / FBP HL dryer controller includes a 4-20mA analogue output which is used for the retransmission of the dryer
dewpoint. Recommended cable: 0.75mm
2
twisted screened cable not exceeding 30m in length.
e type of dewpoint sensor tted diers depending upon the dryer range and outlet dewpoint. e table below highlights the sensors used.
30
Medium Flow Compressed Air Dryers - IOMI.
DRYER MODEL
PRESSURE DEWPOINT
-20°C /-40°C
(-4°F /-40°F)
-70°C
(-100°F)
CDAS HL Parker Dewpoint Sensor (PDS) Hygrometer
OFAS HL Parker Dewpoint Sensor (PDS) Hygrometer
FBP HL Hygrometer Hygrometer
DEWPOINT SENSOR TYPE
PRESSURE DEWPOINT
MEASUREMENT RANGE
ACCURACY CHANGE SENSOR EVERY
Parker Dewpoint Sensor (PDS) -50°C to +0°C PDP +/- 4°C 12 Months
Hygrometer -100°C to +20°C PDP +/- 2°C 12 Months
e Parker Dewpoint Sensor (PDS) and Hygrometer dier
in how they are wired to the CDAS HL / OFAS HL / FBP HL
controller PCB.
An 800Ω (+20 Ω / -0 Ω) resistor will be required in series in
the loop circuit.
Connection of the 4-20mA retransmission is identical for both the Parker Dewpoint Sensor (PDS) and Hygrometer.
PDS HYGROMETER
PDS HYGROMETER
mA mA