Analytical Industries GPR-2500 Series Oxygen Transmitter - Manual (Page 23)

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An over range condition on a 0-100% range indicates an error introduced during the previous calibration. An over
range condition GPR-2500 transmitters equipped with a 0-100% range indicates an error introduced during the
previous calibration. If the over range condition is less than 100.9%, the OVERRANGE warning is not displayed
If the over range condition exceeds 101.0%, the LCD displays the “OVERRANGE” warning in a reversed black
background. This condition indicates an error introduced during the previous calibration, at this point the analyzer
should be calibrated.
Note: To enhance viewing the LCD display, all analyzers and transmitters are equipped with a backlit LCD display.
Due to the limited power availability of the GPR-2500 series of two wire loop powered transmitters, the backlit LCD
feature does not operate when the signal output is less than 10mA.
Start-Up is complete . . . proceed to Calibration