Watlow Series 935A - Manual (Page 37)

Watlow Series 935A User’s Manual 3 5
Thermocouple and Remote Set Point Input Field Calibration Procedure
Equipment Required:
• Type “J” Reference Compensator with reference junction at 32°F/0°C, or Type “J” Thermocouple Calibrator set at 32°F/0°C.
• Precision millivolt source, 0-50mV min. range, 0.01mV resolution.
Set Up:
1. Connect 100-240
Å (ac), or 24-28V ‡ (ac/dc) to Terminal 7 and Terminal 8.
2. Connect the millivolt source to Terminal 1 negative and Terminal 2 positive.
3. Connect voltage source to Terminal 3 negative and Terminal 4 positive.
4. Apply power to the unit and allow it to warm up for 15 minutes.
Move to the Calibration Menu:
1. Press
. and , simultaneously for 3 seconds.
2. Press . or , until [CnFG] is displayed.
Press and hold ß – press . or , to select [`YES] , then release ß .
3. Press . or , until [`TAG] is displayed.
Press and hold ß . Press . or , 8 times (display shall be blank).
Calibration: (Thermocouple)
1. Press and hold
ß , . , and , simultaneously for 3 seconds until [TR50] is displayed.
2. Set the mV source to 50.00mV Î (dc). Set the voltage source to 5.00V Î (dc). Allow 10 seconds for sources to stabilize. Press and
hold ß . Press . or , until [`YES] appears. Release ß .
3. Press , - [Tc00] shall be displayed.
4. Set the mV source to 0.00 mV Î (dc), set voltage source to 0.00V Î (dc). Allow 10 seconds for sources to stabilize. Press and hold
ß . Press . or , until [`YES] appears. Release ß .
5. Press , . [``Tc] shall be displayed.
6. Set the MV source to 0.00 mV (if using a temperature compensator). Set calibrator to 32°F/0°C.
Set voltage source to 0.00V. Allow 10 seconds for sources to stabilize.
Press and hold
ß . Press . or , until [`YES] is displayed. Release ß .
Calibration: (RTD)
Equipment Required:
• Precision Resistance Box with 0.01
Ω
Resolution.
1. Remove thermocouple wires from Terminal 1 and Terminal 2.
2. Connect S2 to terminal 1. Connect S1 to Terminal 2.
3. Press
, . [R`15] shall be displayed.
4. Connect voltage source to Terminal 3 negative and Terminal 4 positive.
5. Set the Decade box to 15.00
Ω
, set the voltage source to 0.00V (Allow 10 seconds for sources to stabilize). Press and hold ß .
Press . or , until [`YES] appears. Release ß .
6. Press , - [R380] shall be displayed.
7. Set the decade box to 380.00
Ω
, set the voltage source to 5.00V. (Allow 10 seconds for sources to stabilize). Press and hold ß .
Press . or , until [`YES] appears. Release ß .
8. Press and hold . and , for 3 seconds to Exit calibration menu.
Calibrating the 935A and Remote Set Point Input