Calibration
For calibration videos involving the touch screen, visit http://www.supersystems.com/tech-videos.
Overview
The series 9125 can be calibrated using the Touchscreen interface. Before performing this procedure on a newly installed controller, the unit needs to be powered on for at least 30 minutes for a warm up period.
The series 9125 has three analog inputs. Each range has a zero and span calibration value. A cold junction trim value must be calibrated for thermocouple inputs. There are two analog outputs each with a zero and span value.
To calibrate an input or output, select the desired option and continue. Note – Even though the “Cold Junction” option is listed first, the inputs and outputs should have the zero and span calibration performed BEFORE performing a cold junction calibration.
Equipment needed
A certified calibrator(s) with the ability to input and read millivolts, milliamps and thermocouples is required. The appropriate connection leads are also required. A 24VDC 75-watt power supply is required.
Notes
Input 1 – terminals 31 and 32
Input 2 – terminals 29 and 30
Input 3 – terminals 27 and 28
Output 1 – terminals 24 and 25
Output 2 – terminals 25 and 26
Zero Calibration - Inputs
To perform a zero calibration, click on the “Zero” option - The circle will be filled in with a dot for the selected option. For a zero calibration, the recommended value to source is 0 mV.
Click on the Calibrate button to begin the calibration.
A progress bar will be displayed along the bottom of the screen giving the progress of the calibration.
Span Calibration - Inputs
To perform a span calibration, click on the “Span” option - The circle will be filled in with a dot for the selected option. For a span calibration, the recommended value is 90 % of the full range. For example, if the range is 80 mV, then the span should be 72 mV. The recommended value can be changed by clicking on the value, and entering the new value that way.
Click on the Calibrate button to begin the calibration.
A progress bar will be displayed along the bottom of the screen giving the progress of the calibration.
Zero Calibration - Outputs
To perform a zero calibration, click on the “Zero” option - The circle will be filled in with a dot for the selected option. When ready to start the calibration, click on the Ready button. The user will then have to measure the current at the appropriate output terminals and enter that value on the button next to the Ready button by clicking on that value button and entering the value.
Click on the Calibrate button to begin the calibration.
A progress bar will be displayed along the bottom of the screen giving the progress of the calibration.
Span Calibration - Outputs
To perform a span calibration, click on the “Span” option - The circle will be filled in with a dot for the selected option. When ready to start the calibration, click on the Ready button. The user will then have to measure the current at the appropriate output terminals and enter that value on the button next to the Ready button by clicking on that value button and entering the value.
Click on the Calibrate button to begin the calibration.
A progress bar will be displayed along the bottom of the screen giving the progress of the calibration.
Cold Junction Calibration
The “Cold Junction” option will allow the user to perform a cold junction trim on the selected board.
To determine if a cold junction adjustment is needed, hook up the calibrator with the appropriate T/C wire attached, and source a temperature to the input. It is recommended to use an operating temperature to source. For example, if the furnace typically runs at 1700 °F, then 1700 °F should be sourced to the input. If the displayed value does not equal the value being sourced, then a cold junction adjust would be necessary. The “Offset” will be the amount of change desired. For example, if 1700°F is being sourced, and the “Value” is showing 1696.4 °F, then the “Offset” would be set to 3.6. If 1700 °F is being sourced, and the “Value” is showing 1702.3 °F, then the “Offset” would be set to -2.3.
Click on the Calibrate button to begin the calibration.
Wait 120 seconds and verify with a source calibration device with the correct T/C type. Note: During a normal calibration procedure, the user should zero and span all of the inputs first and then perform a cold junction calibration, if necessary.
It is recommended after each Cold Junction calibration to source a value in and check what the displayed temperature reading is.
Click on the Return button to close down the screen.