5–15 Read Peak Process Values
The maximum and minimum values of the process value are continuously updated and stored in the memory after
power up. Press both and to access the “READ PEAK” tool program. Press the scroll key to select or
in the lower display. The upper display will now show the high peak value or low peak value of the process,
respectively.
To reset the peak values, press and hold the scroll key for 3.2 seconds, then release. Both the low and high peak values
will now be revised by the current process value.
5–16 Lock/Unlock Parameters
• Lock all of the parameters
Press and hold both and for 3.2 seconds, then release. Keypad operation is now disabled to protect the
parameters from tampering. To unlock the keypad, press and release the up and down keys.
• Lock all parameters in a given security level
Refer to “LOCK Parameter” in section 5–5.
6. Recalibration
Do not proceed through this section unless there is a definite need to recalibrate the controller. All previous
calibration data will be lost. Do not attempt recalibration unless you have the appropriate calibration equipment available.
If the calibration data is lost, you will need to return the controller to your supplier who may charge you a service fee to
recalibrate the controller.
• Equipment needed
1. Standard millivolt source with a range of 0–100mV with accuracy of ±0.01%.
2. Standard voltage source with a range of 0–10V with accuracy of ±0.01%.
3. Standard current source with a range of 0–20mA with accuracy of ±0.01%.
4. Standard ohm source with a range of 0–300 ohms with accuracy of ±0.01%.
5. Standard thermometer with a range of 32–122°F (0–50°C) with accuracy of ±0.36°F (±0.2°C).
6. A cooling fan or, ideally, a calibration fixture equipped with a fan and a push-button switch.
7. Thermocouple simulator.
• Calibration setup:
1. Select T/C input, UNIT=°F, RESO=1DP
2. Switch the power off
3. Disconnect the sensor wiring
4. Connect the input terminals of the controller to the signal sources according to the following diagram
5. Install a fan to blow on the cold-junction compensator located at the rear edge of the lower PCB to prevent it from
warming up.
22
100.0
(HISC)
PV
0
(LOSC)
4
20
Input signal (mA)
LLEr
HLEr
