Super Systems 9120 with TS - Manual (Page 30)

SSi 9120 Touchscreen Interface
4586 – 9120 With Touch Screen Interface Page 30 of 80
Overview
The auxiliary analog inputs can be calibrated using the touch screen and a calibrator. Before
performing this procedure on a newly installed controller, the unit needs to be powered on for at
least thirty (30) minutes for a warm up period to allow the inputs/outputs to stabilize with the
environment.
Each auxiliary analog input has a zero and span calibration value. A cold junction trim value must
be calibrated for thermocouple inputs.
The cold junction trim value must be performed, if
necessary, after the zero and span calibration .
Equipment needed
A certified calibrator(s) with the ability to source and measure millivolts, milliamps and
thermocouples is required. The appropriate connection leads are also required. A 24VDC 75-watt
power supply is required. It is important to note that when performing a zero or span calibration,
do not use regular thermocouple wiring. Instead, use any kind of regular sensor wire, or even
regular copper wire. To perform the calibrations, the user will need a calibrator that is capable of
sourcing volts, millivolts, and temperature.
Calibration Procedure
The calibration procedure for an auxiliary
analog input will be the same regardless of
which operation is being performed.
1. Zero Input: Source a zero mV value to
the terminals. Press the Calibrate
button.
2. Span Input: Source a specific mV value
to the terminals and enter the value in
the box. Press the Calibrate button.
3. Cold Junction Trim: Enter the
temperature of the input.
The user will need to select which calibration
type – Zero/Span or Cold Junction – is to be
performed and press the appropriate button
from the main calibration screen.
The cold
junction trim value must be performed, if
necessary, after the zero and span
calibration
.
Input - Zero Calibration
To perform a zero calibration on an input, verify
that the “Zero” option at the left is selected.
Select the target millivolts that will be sourced.
Note – For a zero calibration, it is recommended
that 0 mV be sourced . The recommended millivolt source value will be displayed as well. The
mV value will be displayed on the screen under the appropriate input. Select the input(s) to be
calibrated. Press the Calibrate button to begin the calibration. The calibration status will be
displayed on screen. When it is over, the screen will display “Waiting to start zero/span