Figure 3-5: Input 1 Connections
Item Description
1 The 250 ohm resistor for milliamp inputs is supplied with the controller when
those inputs are specified. These items must be installed prior to start up when
the controller is wired. For 0-20 mA applications, the resistor should be located
at the transmitter terminals if Burnout detection is desired.
2 Splice and tape this junction between the two thermocouples. This junction
may be located anywhere between the thermocouples and the instrument
terminals, it does not need to be close to the other thermocouple junctions.
Both thermocouples must be of the same type. For best accuracy, the two
thermocouples should be matched or, preferably, made from the same batch of
wire.
3 This controller does not produce a steady current for burnout detection. For
that reason, when a thermocouple is used in parallel with another instrument, it
may be desirable to configure the burnout selection for this controller to
"NOFS" and use the burnout current from the other instrument to also drive
this controller.
4 The millivolt values for the Thermocouple Differential Input are for a pair of J
thermocouples at an ambient temperature mean of 450°F/ 232°C.
57
Chapter 3 - Installation
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