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Calibration, Field calibration – Watlow Series 1500 User Manual

Page 76

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Field Calibration

Technical Reference

76

WATLOW Series 1500 User's Manual

Field Calibration, Appendix

Calibrate Channel 1

°

F Output

7.

Remove (+) plus lead from E-120 and connect to Term. 4. Set Ch-1 input to

(92.93) [93.03] ohms. Adjust Ch-1 SC-Lo pot for 0.000V on DVM. Ch-1

Actual should be 000.0

±

0.5

°

F (-18

°

C).

8.

Set Ch-1 input to (294.91) [291.56] ohms and adjust Ch-1 SC-Hi pot for
4.950VDC. Actual should read 990.0

°

±

0.5

°

F (532

°

C).

9. Repeat Steps 7 and 8 until all the readings are correct with no further

adjustment necessary.

10. Set Ch-1 input to (199.37) [197.69] ohms. DVM should read 2.50VDC. Actual

should read 500

°

±

1.0

°

F (260

°

C).

Calibrate Channel 2

°

F Output

11. Remove DVM (+) plus lead from Term. 4 and connect to Term. 3. Set Ch-2

input to (92.93) [93.03] ohms. Adjust Ch-2 SC-Lo pot for 0.000V on DVM.

12. Set Ch-2 input to (294.91) [291.56] ohms and adjust Ch-2 SC-Hi pot for

4.950VDC on DVM.

13. Repeat Steps 11 and 12 until all the readings are correct with no further

adjustment necessary.

Calibrate %RH Output
14. Remove DVM (+) plus lead from Term. 3 and connect to Term. 2. Set Ch-1 and

Ch-2 inputs to (136.59) [135.97] ohms. Adjust F.S. pot for 0.500VDC on

DVM. Ch-2 Actual should read 100.0

±

1.0.

15. Set Ch-2 input to (112.75) [112.53] ohms. Adjust zero pot for 0.000VDC on

DVM. Ch-2 should read 00.0

±

1.0.

16. Repeat Steps 14 and 15 until readings are correct.

17. Set Ch-2 input to (132.28) [131.74]. DVM should read 0.325

±

0.005VDC and

Ch-2 Actual should read 64.4

±

1.0.

Calibrate Channel 1

°

C Output

18. Power down control. Set DIP Switch #7 ON.

19. Disconnect DVM (+) plus from Term. 2 and connect to Term. 11. Power up

control. Set Ch-1 input to (100.00) [100.00] ohms. Ch-1 Actual should read
000.0

°

C. Adjust

°

C Lo pot for 0.00V on DVM.

20. Set Ch-1 input to (284.04) [280.90] ohms. Ch-1 Actual should read 500.0

°

C.

Adjust

°

C Hi pot for 2.500VDC on DVM.

21. Repeat Steps 19 and 20 until readings are correct.

22. Set Ch-1 input for (195.70) [194.07] ohms. Actual should read 250.0

°

C. DVM

should read 1.25VDC.

NOTE:

#13 thru #16
required only if
%RH analog
output is used.

NOTE:

#17 thru #21
required only if

°

C

analog output is
used.

%RH analog
output does not
work with a
voltage input on
Channel 2