Product guide

Humidity and Dew-Point Instruments
© Michell Instruments 2009-2011
56
Precision Manufacturing
WR285
Electrical Connections
Pin Pin
1 Power Supply V + 8 Output Channel 2 Ground
2 Power Supply V - 9 RS485 Data +
3 Output RS485 Ground 10 RS485 Data -
4 Ground 11 Not connected
5 Not connected 12 Not connected
6 Not connected 13 Output Channel 3 (not connected)
7 Output Channel 2 RH + 14 Output Channel 3 Ground (not connected)
Do not connect pin 2 (V -) to pin 4 (Ground)
Ordering Codes
To construct the order code, select the relevant feature from the tables below, starting with the base model, which is {Feature A} and then add on options to create a
string: {Feature A}+{Feature B}+{Feature C}+{Feature D}
Order example:
WR285+A+15+K1
Digital RH transmitter WR285, 4-20 mA output, stainless steel probe with 2m (6.56’) cable, stainless steel cap with mesh fi lter
WR285 A 15 K1
Signal Output {Feature B}
4–20 mA A
0–10 V B
0–5 V C
0–1 V D
0–20 mA E
Probe Type {Feature C}
SS interchangeable probe with 2m (6.56’) cable 15
Filter {Feature D}
SS cap slotted with mesh fi lter K1
SS cap slotted with PTFE fi lter Z1
Base Model {Feature A}
Digital RH transmitter WR285