EUTECH INSTRUMENTS ALPHA CON 500 2-WIRE TRANSMITTER Instructions d'exploitation télécharger pdf (Page 18)

7 ADVANCED SET UP MODE

7.1 Electrode Offset (OFS) sub-function

This option is available only in the pH mode. An allowance of ±120mV is

allowed to correct for electrode deviations. This feature is useful for

prolonged on-line applications.

The controller will add or subtract the value from the measured pH and

display the correct value. Should the offset value be too high, consider

performing maintenance on the electrode followed by calibration. If the

calibration is unsuccessful, please replace the electrode.

1) Take a sample from the system and note the pH

reading displayed on the controller.

2) Measure the pH of the sample using a calibrated

pH tester, hand-held meter, or bench meter. Record

the correct pH value.

3) Enter Advanced set-up mode. Press ENTER.

4) Press the ∆

∆∆

∆ or ∇

∇∇

∇ keys to scroll until the upper

display shows OFS.

5) Press the ENTER key. The SETUP annunciator appears at the top of the

display. The lower display shows the on-line measured pH value. The upper

display shows the current offset value.

6) Press the ∆

∆∆

∆ or ∇

∇∇

∇ keys until the pH value coincides with the correct pH

value noted in Step 2. As the ∆

∆∆

∆ or ∇

∇∇

∇ keys is pressed to adjust the pH value,

the ‘offset’ value in the upper display also changes.

7) Press the ENTER key to enter the offset value.

Note: The offset value is reset during full calibration. See section 6 for full

calibration instructions.

Note: The offset parameter is blanked out during ORP operation.

SETUP

HOLD

Ofs

OfsOfs

Ofs

-0.05

-0.05-0.05

-0.05

7.00

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EUTECH INSTRUMENTS ALPHA CON 500 2-WIRE TRANSMITTER Instructions d'exploitation Page 18

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