OM-550
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8
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2.1.3 CHANNEL CONNECTORS
The five input connectors on the right side of the OM-550 accept either voltage or
thermocouple inputs values.
Figure 2-9
The mating connectors are color coded by conductor material, as described in the table
below. For best accuracy, use the appropriate color of connector.
CONNECTOR COLOR
APPLICATION
White
Uncompensated
Voltage inputs
Black
Type J
thermocouples
Yellow
Type K
thermocouples
Blue
Type T
thermocouples
Purple
Type E
thermocouples
Orange
Type N
thermocouples
••
Optional Connectors:
White
Type B
thermocouples
Green
Type S or R
thermocouples
To minimize danger to personnel, and to avoid ground loops which could affect
measurement accuracy, always disconnect the RS-232 cable before attaching the
input signals.
