User Guide

15
The pH and ORP calibrations can not be initiated while the
process controller is configurated to take measurements from
the Digital Transmitter.
pH CALIBRATION
It is recommended to perform pH calibration when the probe
is replaced and after any cleaning action.
To perform any pH calibration procedure, the instrument has
to be set as pH controller.
Initial Preparation
Pour small quantities of pH 7.01 (HI 7007) and pH 4.01
(HI 7004) or pH 10.01 (HI 7010) solutions into individual
beakers. If possible, use plastic beakers to minimize any EMC
interference.
For accurate calibration use different beakers for each buffer
solution, the first one for rinsing the electrode and the second
one for calibration. By doing this, contamination between
buffers is minimized.
• Enter the calibration mode, select the pH calibration (by
moving through the menu with the  and  keys), then
press the CFM key.
• Choose the pH buffer set between the two available ones:
the standard set (4.01, 7.01, 10.01) and the NIST set (4.01,
6.86, 9.18). For the standard set confirm the “Std”; for the
NIST set confirm the “niSt” (use the  and  keys for select
between the two options).
HI 7007
CALIBRATION
HI 7007
RINSE