Product guide

Humidity and Dew-Point Instruments
© Michell Instruments 2009-2011
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Environmental Control
WM261
Electrical Connections
Version mA output and Pt100
direct
Version mA output for RH and
Temperature
Version V output and Pt100
direct
Version V output for RH and
Temperature
Pin 1 Output RH + Pin 1 Output temperature + Pin 1 Power supply V + Pin 1 Power supply V +
Pin 2 Output RH - Pin 2 Output Temperature - Pin 2 Common ground Pin 2 Common ground
Pin 3
Pt100 direct
Pin 3 Output RH + Pin 3 Output RH + Pin 3 Output Temperature +
Pin 4 Pin 4 Output RH - Pin 4
Pt100 direct
Pin 4 Output RH +
Pin 5
Warning:
Temperature channels Pin 1 and
Pin 2 must be powered always
Pin 5
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:
WM261+A+1+Z10
Relative humidity transmitter WM261 with 4-20 mA output, Pt100 direct signal, noryl slotted cap and polyester PTFE fi lter
WM261 A 1 Z10
Filter {Feature D}
Noryl cap slotted & polyester PTFE fi lter Z10
Signal Output {Feature B}
4–20 mA A
0–10 V B
0–5 V C
0–1 V D
Temperature Signal {Feature C}
No temperature output 0
Pt100 direct 1
-30 to +70ºC (-22 to +158ºF) 3
-30 to +20ºC (-22 to +68ºF) 4
0 to +50ºC (+32 to +122ºF) 5
Other output scaling available on request TX
Base Model {Feature A}
Digital RH and temperature transmitter WM261