RC Systems ViewSmart 1600+, Operation Manual

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UM-1097
Revision B 78
5.3 Routine Calibration Procedure
Set Zero & Set Span controls in the Local Cal menu allow pushbutton calibration by moving the highlight
bar to each and pressing the Edit button.
Unintentional calibrations are reset by the Set Unity Gain menu item. Set Unity Gain resets zero offset to
0 and span gain to 1. It is useful for returning the calibration to a known starting place. Sensor aging may
be monitored by recording zero and span readings at Unity Gain when it is new, and again at later dates
when degradation may have occurred.
Use the following procedure to perform Zero and Span calibrations.
1. Apply the ZERO calibration value to the sensor and observe the live reading
2. If the zero reading differs from the zero setpoint, a calibration is needed
3. To calibrate zero, move the highlight bar to Set Zero and press Edit
4. A warning message explains that pressing Edit again will change the zero calibration and any other
key will exit
Note : For span calibration, if a gas sensor is to be spanned with 50% span gas, the span set-point must
be 50%. If 45% is to be used later, the span set-point must be changed to 45% to match the span
calibration gas.
5. Apply the SPAN calibration value to the sensor and observe the live reading and allow the reading
to stabilize
6. If the reading differs from the gas applied, a span calibration is needed
7. Move the pointer to the Set Span entry and press Edit twice
Note : Unity Gain may be used at any time to cancel incorrect calibrations and start again.
Calibration history records are logged and may be viewed in the Even Log.