Red Lion PAX2C User Manual

Page 47

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Preparation for TC calibration

TC calibration parameters will affect RTD calibration. If using an RTD, it is

recommended that the RTD calibration be performed after completing the TC

calibration.

Warning: TC Input Calibration of this controller requires a signal

source capable of producing a 60 mV signal with an accuracy of

0.01% or better.

Before starting, verify the T/V jumper is in the T position. Verify the precision

signal source is connected and ready. Allow a 30 minute warm-up period before

calibrating the controller. Selecting NO at any calibration step, will cause the unit

to maintain the existing calibration parameters for that step. Selecting YES and

pressing

P key will cause the unit to store new calibration settings for the range

selected. Pressing

D at any time will exit programming mode, but any range that

has been calibrated will maintain the new settings.

TC Calibration Procedure

1. After entering CodE 48, select the tc.

2. Press the

P key. Display will indicate 60mU with 2ER displayed in the Line 2

units mnemonic.

3. Apply 0 mV to input.

4. Press ! to select YES.

5. Press

P. Display will indicate ---- on Line 2 as the unit reads and stores the

new calibration parameter.

6. Display will indicate 60mU with FUL displayed in the Line 2 units mnemonic.

7. Apply 60 mV to input.

8. Press ! to select YES.

9. Press

P. Display will indicate ---- on Line 2 as the unit reads and stores the

new calibration parameter.

10. TC Calibration complete.

Preparation for RTD Input Calibration

RTD calibration is dependent on TC calibration parameters. Therefore, the

TC calibration should be performed prior to attempting the RTD calibration.

Warning: RTD Input Calibration of this controller requires a signal

source capable of producing a 300 ohm resistance with an

accuracy of 0.01% or better.

Before starting, verify that the T/V Jumper is in the T position. Verify the

RTD jumper is in the proper range. Verify the precision signal source is

connected and ready. Allow a 30 minute warm-up period before calibrating the

controller. Selecting NO at any calibration step, will cause the unit to maintain the

existing calibration parameters for that step. Selecting YES and pressing

P key

will cause the unit to store new calibration settings for the range selected.

Pressing

D at any time will exit programming mode, but any range that has been

calibrated will maintain the new settings.

RTD Calibration Procedure

1. After entering Code 48, select rtd.

2. Press the

P key until the desired range along with 0 is displayed in the Line 2

units mnemonic.

3. Apply zero ohms to the input of the controller.

4. Press ! to select YES.

5. Press

P. Display will indicate ---- on Line 2 as the unit reads and stores the

new calibration parameter.

6. Display will indicate the desired range along with a value in the upper right

corner, in ohms, to be applied in the next step in the Line 2 units mnemonic

of the controller.

7. Apply the signal level, in ohms, as indicated by the Line 2 units mnemonic on

the controller.

8. Press ! to select YES.

9. Press

P. Display will indicate ---- on Line 2 as the unit reads and stores the

new calibration parameter.

10. Repeat Preparation and Calibration Procedure for each Input Range to be

calibrated.

Ice Point Calibration Procedure

1. Remove all option cards.

2. Verify ambient temperature of controller environment is between 20°C and

30°C.

3. Set T/V jumper in the T position.

4. Connect a thermocouple with an accuracy of 1°C or better to the controller.

5. In the Analog Input Parameters, verify Input Type (tYPE) is set to the type of

thermocouple connected in step 4, Temperature Scale (SCAL) is °C, Ice Point

Compensation (ICE) is turned ON, Decimal Resolution (dCPt) is 0.0, Rounding

Increment (rnd) is 0.1 and Display Offset (OFSt) is set to 0.

6. Place the thermocouple in close thermal contact to a reference thermometer

probe. (Use a reference thermometer with an accuracy of 0.25% °C or better.)

The two probes should be shielded from air movement and allowed sufficient

time to equalize in temperature. (A calibration bath could be used in place of

the thermometer.)

7. If a difference exits between PAX2C display and reference thermometer,

continue calibration.

8. Note the PAX2C display reading as the “Display Mode” reading to be used in

Step 12.

9. Enter the Factory Service Operations, select CodE 48 and press

10. Select ICE and press

11. Display will indicate the Existing ICE Point Value.

12. Calculate a new ICE Point Value using: Existing ICE Point Value +

(reference temperature – Display Mode reading). All values are in °C.

13. Using ! and @ change Existing ICE Point Value to indicate the new ICE

Point Value calculated in Step 12.

14. Press

P and return to Display Mode. Verify the Display Mode reading (with

0 Display Offset) matches the reference temperature. If not, repeat steps 8

thru 14.

Preparation for Analog Output Card Calibration

Warning: Calibration of this controller requires an external meter

with an accuracy of 0.005% or better.

Before starting, verify that the precision voltmeter (voltage output) or current

meter (current output) is connected and ready. Perform the following procedure.

1. After entering CodE 48, select AnLG.

2. Using the chart below, step through the five selections to be calibrated. At

each prompt, use the PAX2C ! and @ keys to adjust the external meter

display to match the selection being calibrated. When the external reading

matches, or if the particular range is not in need of calibration, press the

P key

to advance to the next range.

PAX2C DISPLAY

EXTERNAL METER

ACTION

0.0 mA

0.00 mA