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ROC364 Instruction Manual

3-18 Input and Output Modules Rev Jun/05

 NOTE: The RTD module input can be calibrated before installing it in the field when short wire

runs will be used, but if the RTD module is used as a temperature input to a flow calculation,

then the RTD should be calibrated at the same time as the pressure inputs.

A4464821

ABC

DECADE BOX

RTD

WHTC

WHT

RED

Figure 3-21. Calibration Setup

Table 3-1. Calibration Resistance Values

ALPHA –50ºC (58ºF) 100ºC (212ºF)

0.00385 80.31 Ohms 138.50 Ohms

0.00392 79.96 Ohms 139.16 Ohms

NOTE: Resistance values for RTD probes with other alpha

values can be found in the temperature-to-resistance

conversion table for that probe.

1. Connect the decade box as shown in Figure 3-21.

2. Set the decade box to the –50°C (–58°F) resistance value corresponding to the RTD alpha value

in Table 3-1.

3. Enter the value displayed for “Raw A/D Input” as the value for “Adjusted A/D 0%” using the

Analog Inputs configuration screen for the RTD input. Refer to ROCLINK > Configure > I/O >

AI Points Advanced tab.

4. Set the decade box to the 100°C (212°F) resistance value given in Table 3-1.

5. Enter the value displayed for “Raw A/D Input” as the value for “Adjusted A/D 100%” using the

Analog Inputs Advanced configuration screen for the RTD input.

6. Enter –50°C (–58°F) for “Low Reading EU” using the Analog Inputs configuration screen. Refer

to ROCLINK > Configure > I/O > AI Points General tab.

7. Enter 100°C (212°F) for the “High Reading EU” using the Analog Inputs configuration screen.

8. Click Apply to save the changes.

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Emerson ROC364 Bedienerhandbuch Seite 52