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2009 Nalco Company
4-20
Technical Help
(630) 305-CHEM
3D TRASAR
5500 - Installation & Operation Manual
4.10.4 pH Calibration Screens
Select
pH
from the
Calibration
menu and follow screen directions to
perform calibration:
A
1-point calibration
utilizes the system water as the calibration point.
It is best used to fine-tune your calibration to compensate for minor drifting.
A
2-point calibration
is best utilized when installing a new probe or if a
major error has developed due to excessive fouling or probe degradation.
Control
Settings
Alarm
Settings
Preferences
System
Info
Network
Information
Manual
Relay
Actions
Menu
Alarms
For a 1-point calibration
STEP 1
- Leave probe in tee with water flowing. Select
1-point
calibration.
STEP 2
- Using a handheld instrument of known accuracy and
calibration, sample the process water and determine the pH
value.
STEP 3
- Enter this value.
For a 2-point calibration
STEP 1
- Select
2-point
calibration.
STEP 2
- Close the sample inlet, lower sensor outlet, and 3-way valves.
STEP 3
- Remove the pH probe from the tee.
STEP 4
- Swirl the probe in a beaker of clean, fresh pH 7.0 buffer
solution
(P/N 460-S0407.75)
. Press
Continue
.
STEP 5
- After prompt, rinse probe well in clean DI water and wipe clean.
STEP 6
- Swirl probe in a beaker of clean, fresh pH 10.0 buffer solution
(P/N 460-S0408.75)
. Press
Continue
.
STEP 7
- After successful calibration reinstall probe and open valves.
!
If probe calibration is unsuccessful, check standards, wiring
connections, or handheld pH meter for accuracy. Soak probe
in standard extra 5-10 min or clean probe tip and recalibrate.
