Honeywell UDC2500 manual Input 1 Set Up Wiring, Thermocouple Inputs Using an Ice Bath

Input Calibration

Type of Input

Equipment Needed

RTD (Resistance

Thermometer

Device)

Milliampere,

Millivolt, Volts, and

Radiamatic

•A decade box, with at least ± 0.02 % accuracy, capable of providing stepped resistance values over a minimum range of 0 to 1650 ohms with a resolution of 0.001 ohm.

•Three insulated copper leads of equal length for connecting the decade box to the controller.

•A calibrating device with at least ± 0.02 % accuracy for use as a signal source.

•Two insulated copper leads for connecting the calibrator to the controller.

•Place current source at zero before switching ON.

•Do not switch current sources OFF/ON while connected to the UDC2500 input.

5.4 Input 1 Set Up Wiring

Thermocouple Inputs Using an Ice Bath

Refer to Figure 5-2and wire the controller according to the procedure given in Table 5-4..

Table 5-4 Set Up Wiring Procedure for Thermocouple Inputs

Using an Ice Bath

Step Action

1Connect the copper leads to the calibrator.

2Connect a length of thermocouple extension wire to the end of each copper lead and insert the junction points into the ice bath.

3Connect the thermocouple extension wires to the terminals for Input #1. See Figure 5-2.

+

Millivolt _ Source

Copper Leads

Ice Bath

+	26
_
	27

Thermocouple

Extension Wire

Figure 5-2 Wiring Connections for Thermocouple Inputs Using an Ice Bath

140 UDC2500 Universal Digital Controller Product Manual 4/07