Calibration Procedure - Hach PHC28101 User Manual

Ph refillable probe for low ionic strength samples

Table of Contents

Calibration

Before calibration:

The probe must have the correct service-life time stamp. Set the date and time in the meter before the probe is attached.

It is not necessary to recalibrate when moving a calibrated probe from one HQd meter to another if the additional meter is

configured to use the same calibration options.

To view the current calibration, push

If any two probes are connected, push the UP or DOWN arrow to change to the single display mode in order to show the

Calibrate option.

Prepare the probe for use (refer to

1. Connect the

2. Push

probe to the

Calibrate. The

meter. Make sure

display shows the

that the cable

buffers that are

locking nut is

necessary for

securely

calibration.

connected to the

meter. Turn on the

meter.

, select View Probe Data, then select View Current Calibration.

Preparation for use

Calibration notes:

•

pH buffers can be used in any order. Use buffers that are two pH units apart.

•

Additional standard sets along with the minimum number of calibration points can be

selected in the Calibration Options. For a two point calibration, it is recommended that

two buffers be selected: one with a pH above and one with a pH below the expected

sample pH. For a one point calibration, select the buffer nearest to the expected

sample pH.

•

The calibration is recorded in the probe and the data log. The calibration is also sent

to a PC, printer or flash memory stick if connected.

•

Air bubbles under the sensor tip when submerged can cause slow response or error

in measurement. If bubbles are present, gently shake the probe until bubbles are

removed.

•

If a calibration error occurs, refer to