Quick Start Guide
T31 Indicators
Ohaus Corporation www.ohaus.com
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T31 Indicators
Quick Start Guide
ASSEMBLY
Both the T31P and T31XW connect to a scale base through a Load Cell Cable that connects to
the Indicator’s Main Printed Circuit Board (PCB). Follow these connection instructions.
Load Cell cable connections are on the rear of both models:
T31P
(rear view)
T31XW
(rear view)
Remove the four screws from the Bottom Housing. Separate the Top and Bottom Housing.
Connect the Load Cell cable leads to Load Cell Terminal J5 on the T31’s Main Printed Circuit
Board. (Note Jumpers W1 and W2. RS232 terminals and LFT Switch are also shown.)
OFF
ON
J7 J6
J5
W1 W2
J4
Printed Circuit Board (PCB), T31 Indicator
Jumper Connections
For a 4-wire load cell with no sense wires, short Jumpers W1 and W2.
For a 6-wire load cell that includes sense wires, open Jumpers W1 and W2.
For load cells with an extra ground shield wire, connect the shield to the center position (GND).
+EXC +SIG -SIG -EXC
+SENS GND -SENS
Load Cell wiring.
Pin Connection
J5-1 +Excitation
J5-2 +Sense
J5-3 +Signal
J5-4 GND
J5-5 –Signal
J5-6 –Sense
J5-7 –Excitation
Open/shorted jumpers.
Re-assemble the Top and Bottom Housing.
Load Cell
Terminal J5
Sense
Jumper W1
Sense
Jumper W2
LFT On/Off
Switch
RS232
Terminal J6
(T31P only)
RS232
Terminal J7
(T31XW only)
Power
Receptacle
Strain relief for
Load Cell Cable
RS232
Connector
Strain relief for
Power Cable
Strain relief for
Load Cell Cable
Strain relief for
RS232 Cable
