Watlow Series 94 - Manual (Page 29)

W a t l o w S e r i e s 9 4 A p p e n d i x ■ A . 5
Appendix
NOTE:
Before calibration
on an installed con-
troller, make sure all
data and parameters
are documented.
See the Setup and
Operation Tables in
Chapter Four.
NOTE:
When the Output 2
indicator light is on,
the controller is au-
tomatically calibrat-
ing. Your sequence
is VERY important.
Always move to the
next parameter
before changing the
calibration equip-
ment.
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
Setup And Calibration
1. Connect the ac line voltage L1 and L2 to the proper terminals.
2. Connect the millivolt source to Terminal 5 Negative and Terminal 3 Positive on the
Series 94 terminal strip. Use regular 20 - 24 gauge wire. Make sure the DIP switch is
set for thermocouple input. See Chapter 4.
3. Apply power to the controller and allow it to warm up for 15 minutes. After warm-up
put the controller in the Calibration Menu. Select [`YES].
4. Press the Reset Key twice to turn on Output 2 indicator light. The unit is calibrating
when Output 2 indicator light is on. Make sure you are in the correct parameters when
Output 2 indicator light is on.
5. Press the ‰Advance key once to get to the [`)00] prompt. At the 0.00 prompt, enter
0.00mV from the millivolt source to the Series 94. Allow at least 10 seconds to stabilize.
Press the
‰ Advance key.
6. At the 50.0 prompt, enter 50.00mV from the millivolt source to the Series 94. Allow at
least 10 seconds to stabilize. Press the ‰Advance key.
7. At the [``tC] prompt, disconnect the millivolt source, and connect the reference com-
pensator or thermocouple calibrator to Terminal 5 Negative and Terminal 3 Positive on
the Series 94 terminal strip. If using a compensator, turn on and short the input wires.
If using "J" calibrator, set to simulate 32°F/0°C. Allow 10 seconds for the control to sta-
bilize, then press the Reset Key twice to turn off Output 2 indicator light. The unit will
leave the calibration mode if one minute passes between key activations. To conclude
the thermocouple calibration, press the
‰ Advance key to the next prompt or exit the
Calibration Menu.
Equipment Required
• 1K
Ω
precision decade resistance box with 0.01
Ω
resolution.
Setup And Calibration
1. Connect the ac line voltage L1 and L2 to the proper terminals.
2. Connect the decade resistance box to Terminal 2, 3 and 5 on the terminal strip. Use
regular 20 - 24 gauge wire of the same length and type. Make sure the DIP switch is set
for RTD input, see Chapter 4.
3. Apply power to the unit and allow it to warm up for 15 minutes. After warm-up put
the controller in the Calibration Menu. Select [`YES]. Press the ‰Advance key until
the [`440] prompt is displayed.
4. Press the Reset Key twice to turn on Output 2 indicator light. The controller is calibrat-
ing when Output 2 indicator light is on. Make sure you are in the correct parameters
when Output 2 indicator light is on.
5. At the [`440] prompt, set the decade resistance box to 44.01. Allow at least 10 seconds
to stabilize. Press the ‰Advance key.
6. At the [`255] prompt, set the decade resistance box to 255.42. Allow at least 10 sec-
onds to stabilize. Press the Reset Key twice to turn off Output 2 indicator light. The
unit will leave the calibration mode if one minute passes between key activations. To
conclude the RTD calibration, press the ‰Advance key to the next prompt or exit the
Calibration Menu.
Thermocouple Field Calibration Procedure
RTD Field Calibration Procedure