Analytical Industries GPR-2500 S Oxygen Analyzer - Manual (Page 21)

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The display will not shift automatically. Instead, when the oxygen reading (actually the sensor’s signal output)
exceeds 110% of the upper limit of the current range an OVER RANGE warning will be displayed.
27.0
%
OVERRANGE
MANUAL SAMPLING
25% RANGE
24.5 C 100 KPA
Once the OVER RANGE warning appears the user must correct the source of the problem or advance the monitor
to the next higher range via the menu and keypad Press MENU, select MANUAL SAMPLING, press ENTER, select
the appropriate MANUAL RANGE and press ENTER again.
An over range condition on a 0-25% range indicates an error introduced during the previous calibration. An over
range condition GPR-2500 monitors equipped with a 0-25% range indicates an error introduced during the previous
calibration. If the over range condition is less than 25.9%, the OVERRANGE warning is not displayed
If the over range condition exceeds 26.0%, 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 monitor
should be calibrated.
Note: To enhance viewing the LCD display, all monitors and monitors are equipped with a backlit LCD display.
Due to the limited power availability of the GPR-2500 series of two wire loop powered monitors, the backlit LCD
feature does not operate when the signal output is less than 10mA – should not be a consideration with the GPR-
2500S as its intended use at 20.9% oxygen will produce approximately a 17.9mA output.
Installation is complete . . .