Calibration Of The Analog Output; Direct Test - Hach ORBISPHERE G1100 User Manual

Sensor and analyzer

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8.4.3 Calibration of the analog output

The calibration of the analog output is aimed at aligning the internally calculated current to the

real current output. This was performed at factory, but could become necessary again because

of electronic tolerances. A precision amperometer (or voltmeter for the voltage versions)

connected at the corresponding analog output connection point is required. Refer to

Measurement board on page

34.

Select the analog output number to calibrate and press the

Start button.

Measure with the amperometer the current value for point 1. It

should be below 4 mA

Edit point 1 and enter the same value as read on the

amperometer, then press the Continue button.

Measure with the amperometer the current value for point 2. It

should be above 20 mA.

Edit point 2 and enter the same value as read on the

amperometer, before pressing the Continue button.

Calibration of the selected analog output channel is

completed.

Test to check the calibration of the analog outputs. A

precision amperometer connected at the analog output

connection point is required.

Select a value (4, 12, 20 mA available) for each channel

•

and compare this value (+ 0.02 mA) with what the

amperometer shows.

A calibration is required if the value on the amperometer

differs from the current selected + 0.02 mA).

Inputs/Outputs Menu

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Orbisphere 410