Analytical-industries GPR-2500 S Oxygen Analyzer Manuel d'utilisateur télécharger pdf (Page 23)

Press the ENTER key to calibrate or MENU key to abort and return to SAMPLING mode.

0.000 PPM

ZERO

CALIBRTION

ENTER TO CALIBRATE

MENU TO ABORT

Allow approximately 60 seconds for the calibration process while the processor determines whether the signal

output or reading has stabilized within 60% of the full scale low range.

Both the Zero Calibrate and Span Calibrate functions result in the following displays:

PASSED

CALIBRATION

FAILED

CALIBRATION

Satisfying users that the zero offset is reasonably acceptable for their application can be accomplished much

quicker. Unless the zero gas is contaminated or there is a significant leak in the sample connections, the monitor

should read less than 100 ppm oxygen within 5 minutes after being placed on zero gas.

The maximum zero calibration adjustment permitted is 60% of the lowest full scale range available, which normally

is 1 ppm. Thus the maximum zero calibration adjustment or zero offset is 6 ppm oxygen. Accordingly, the monitor’s

ZERO has not been adjusted prior to shipment because the factory conditions are different from the application

condition at the user’s installation.

The maximum zero calibration adjustment permitted is 60% of the lowest full scale range available, which normally

is 1%. Thus the maximum zero calibration adjustment or zero offset is 0.6% oxygen. Accordingly, the monitors’

ZERO has not been adjusted prior to shipment because the factory conditions are different from the application

condition at the user’s installation.

Accuracy due to manufacturer tolerances may result in a slight difference between the LCD display and the analog

output of the 4-20mA integrated circuit. However, the difference is less than 0.25% of range and falls well below

the specified accuracy of the monitors.

Factory Default Zero:

The software will eliminate any previous zero calibration adjustment and display the actual the signal output of the

sensor at a specified oxygen concentration. For example, assuming a zero gas is introduced, the display will reflect

an oxygen reading representing basically the zero calibration adjustment as described above. This feature allows

the user to test the sensor’s signal output without removing it from the sensor housing.

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Analytical-industries GPR-2500 S Oxygen Analyzer Manuel d'utilisateur Page 23