ROTRONIC MBW 473 - Manual (Page 35)

MBW473_MANUAL_E_V2.0 31
Use your own External Temperature Sensor
The External Temperature plug on the back panel is used for the connection of an external tempera-
ture probe. External temperature measurements are required if certain humidity parameters, such as
%RH, are to be computed. External temperature measurements are not required for dew or frost point
measurements.
If you wish to make your own thermometer cable, the 473 re-
quires a 5 pin LEMO connector (www.lemo.ch), part number FGG
1B 305 CLAD 42.
After identifying pin 1, follow the line counter-clockwise from pin 1 to all other pins in succession. Wire
the cable according to the following scheme:
When the 5-pin LEMO connector is properly assembled, the red dot of the connector housing
is located directly above pin 1.
Pin Signal Position Description
1 Shield
When viewing the solder tubs of a
disassembled 5-pin LEMO connector,
pin 1 is usually identified with a full or
partial circle drawn around it. Pin 5
should have no identifier. When wiring
the cable, note that the pin numbering
of the socket in the back panel of the
instrument starts at the top left (pin 1)
and goes counter-clockwise (as
viewed from the rear of the unit).
2 +I
3 +V
4 -I
5 -V
Red Dot aligns with Pin 1