Thermocouple calibration, T/c calibration – Watlow Series 365 User Manual
Page 11
WATLOW Series 365 User’s Manual
11
T/C Calibration
The Series 365 is calibrated and tested before leaving the factory.
Thermocouple Calibration
365X-X6XX-X000
Equipment required:
•
Precision millivolt source (mV source).
•
Appropriate type reference compensator with reference junction at 32°F/0°C.
Setup:
1.
Wire your control for the correct line voltage. See power wiring on
Page 6, Figure 6.
2.
Connect the millivolt source to the thermocouple reference compensator, and
the compensator to the thermocouple input terminals on the Series 365
(Terminals 3 and 5). See Page 7, Figure 8.
3.
Make sure the heat/cool switch is in the correct position for your application.
See Page 6, Figure 5. Apply power.
4.
Refer to Table 1 below for values that apply to your unit’s range code.
Range
Millivolt
Code
Low/High
T/C
Low
High
Type
mV
mV
601
32 to
600°F/
0 to
315°C
“J”
0.000
17.186
602
32 to 1382°F/
0 to
750°C
“J”
0.000
42.283
603
32 to 2282°F/
0 to 1250°C
“K”
0.000
50.633
604
150 to
662°F/
66 to
350°C
“T”
3.711
17.816
605
-328 to
150°F/ -200 to
66°C
“T”
-5.603
2.711
606
32 to 2543°F/
0 to 1395°C
“Pt2”
0.000
55.246
607
32 to 2732°F/
0 to 1500°C
“S”
0.000
15.576
608
32 to 2732°F/
0 to 1500°C
“R”
0.000
17.445
Procedure:
1.
Set the mV source to ______, the Low mV
value. Turn the setpot fully CCW. Adjust the
Low pot until the unit just fully de-energizes.
2.
Set the mV source to ______, the High mV
value. Turn the setpot fully CW. Adjust the
High pot until the unit just fully de-energizes.
3.
Repeat Steps 1 and 2 as necessary until no
further adjustment is needed.
Bottom View
High
Potentiometer
Low
Potentiometer
Table 1 -
Thermocouple Input
Calibration Values