14
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 pH7 .01 (
HI7007
) and pH4 .01
(
HI7004
) or pH10 .01 (
HI7010
) solutions into individual
beakers . If possible, use plastic beakers to minimize any
EMC interference .
For accurate calibration use different beakers for each buf-
fer 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) .
Содержание HI 504
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