HQ Series Portable Meters

pH Operation and Methods

4. The display shows the value of the check standard and either

“Check Standard Passed” or “Check Standard Failed” appears.

If “Check Standard Passed” appears, the success criteria has been met, and the measurement has been verified to be accurate. Press the

GREEN/RIGHT

key under Done to proceed with sample measurements.

5. If “Check Standard Failed” appears, the measurement is outside of the accepted limits.

If the acceptance criteria is set to “Cal Expires on Failure: Yes”, the instrument will display the

CALIBRATION ?

icon until it is re-calibrated. Press the

BLUE/LEFT

key under Calibrate and follow the steps for calibration.

6.3.1 Deferring a Check Standard

A Check Standard Reminder can be deferred to a later time. This option is set in the Parameter Methods menu so that a supervisor can control this function. A password is required to change this setting. To defer the Check Standard measurement to a later time, use the Reading Check Standard screen.

1. Press the

UP

key under Defer.

2. Use the

UP

and

DOWN

keys to select when the next reminder will be displayed.

3. Press the

GREEN/RIGHT

key under OK. The Check Standard reminder will appear after the selected time has passed.

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