Ariens Path-Pro 136E User Manual download pdf (Page 63)

R, S, & B Thermocouple Field Calibration Procedure

Equipment Required

Type

“R”

Reference Compensator with reference junction at

0°C/32°

F OR

T/C calibrator.

Type

“R”

T/C Extension Wire.

l Copper wire.

Precision Millivolt Source.

Setup and Calibration

Connect the precision millivolt source to Terminals

and

#8.

See the figure

below.

Series 920

Terminal Strip

Figure 37

Type

"R"

Reference

Compensator-to-

Series 920

Connec-

tion Diagram.

Connect AC line voltage, L1 to

#17,

L2 to

#20,

ground to

#21.

Set DIP switch

to ON. Apply power to the unit and allow it to warm up

for 15 minutes. The unit should be in the TEST mode.

Using the MODE key, advance until the IN

parameter appears on the

alphanumeric display. Using the UP/DOWN keys, advance to the

“R”

thermocouple input type. Press the ENTER key.

Press the MODE key until the

ATZ

prompt will appear.

Set the precision millivolt source for an output of 0.000 millivolts,

(32°F/0°C).

Allow 10 seconds for the control to stabilize, and press ENTER.

11.

Press the MODE key, the ATG prompt appears in the alphanumeric display.

Set the precision millivolt source for an output of 16.035 millivolts,

(2552°F/

1400°C).

Allow 10 seconds for the control to stabilize and press ENTER.

Disconnect the millivolt source and connect the input side of the thermo-

couple reference compensator, or output of the T/C calibrator, to

Positive

and

Negative on the Series 920 terminal strip.

Connect the reference compensator to the 920. See Page 62, Figure 37.

Turn the compensator ON. Allow 10 seconds for the control to stabilize.

Press the MODE key, advance until the CJ prompt appears in the display,

press ENTER. The unit is now calibrated for

S, and B T/C units.

Remove power from the Series 920. Remove the T/C wires from

and

#8.

Turn off the compensator. Set DIP switch

to the OFF position.

NOTE:

Before calibration on an installed control, make sure all data and

parameters are documented.

Appendix

WATLOW

Series 920 User's Manual 63

1 2 ... 58 59 60 61 62 63 64 65 66 67 68 ... 79 80

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