Hach 900 MAX manual ORP Probe Connection, Section

Section 5

Probes must be calibrated to the sampler each time they are cleaned or replaced. Regular inspection and comparison to a hand-held pH meter can help determine the optimum cleaning and calibration schedule for specific applications.

1.From the Main Menu, select OPTIONS > ADVANCED OPTIONS >

CALIBRATION > pH.

2.Place the pH probe into the first buffer solution, then press any key to continue.

3.Enter the temperature of the first buffer solution using the numeric keypad. Press ACCEPT to continue.

4.Select the pH for the first buffer solution (4, 7, or 10 pH) using the

CHANGE CHOICE key, then press ACCEPT.

5.Remove the probe from the first buffer solution, rinse it under distilled water and place it into the second buffer solution (4, 7, or 10 pH, different from the first buffer used). Press any key to continue.

6.Select the pH for the second buffer solution using the CHANGE CHOICE key, then press ACCEPT.

If the pH probe is damaged and cannot be calibrated or if the buffer solutions do not fall within an acceptable range, an error message will be displayed as shown below.

11:00 AM 21 - APR - 01

ERROR MESSAGE

pH CALIBRATION FAILED-GAIN AND/OR OFFSET OUT OF RANGE TRY AGAIN

(PRESS ANY KEY TO CONTINUE)

Another attempt at reading the second buffer solution will be made after pressing a key. If this fails, it is likely that you have a bad pH probe or bad buffer solutions. Try a new set of buffer solutions and if that fails try a different pH probe

5.3 ORP Probe

The probes are shipped with a wetting cap that covers the probe tip. Remove the cap by turning it counter-clockwise and gently easing it off. Keep this cap for long-term probe storage. Rinse the probe tip with distilled water.

Store the probe in a pH 4.0 buffer (Cat. No. 22834-49) for both overnight and long term storage. Never store a probe in distilled or deionized water because this will deplete the probe filling solution.

5.3.1 ORP Probe Connection

This connector is for installing the pH or ORP pre-amp interface junction box or a stand-alone temperature sensor. The ORP probe is attached to a terminal strip in the junction box.

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