45
6.1.2
Calibration Menu Flow Chart
Channel 2
*S.P.C.
Channel 2
Calibration P1
Channel 2
Calibration P2
Only when Channel 3
pc board is installed
Only when Channel 2
pc board is installed
Channel 1
*S.P.C.
Channel 1
Calibration P1
Channel 1
Calibration P2
Channel 3
Calibration P1.
Channel 3
Calibration P2
Operation display
Process
Passw ord
XXXXX
Menu
Calibration
Chann.Definition
1,2,3…..
Selects
P1 value
Moves
to next
choice
To Exit
menu
Selects
P2 value
* Only when pH parameter is selected
6.1.3
pH Sensor Calibration
The calibration procedure is necessary to standardise the sensor sensitivity.
The double point calibration gives the maximum accuracy because it allows to set both the slope and the
offset of the curve giving displayed pH value as a function of the mV from the probe (sensitivity), pH = f (mV).
The first point can be calibrated by 7 pH buffer solution (0mV) and the second point can be calibrated by 4pH
buffer solution.
6.1.3.1 Double point calibration
The calibration procedure involves a series of operation on the pH probe and the transmitter. The following
description explains indicates step by step the calibration procedure.
To operate the calibration the following material is necessary:
- two plastic or glass beakers
- standard buffer solution, pH 7 and pH 4 or other, (see paragraph 6.1.3)
- de-mineralised water
- a thermometer
Summary of Contents for AW400 Series
Page 1: ...Instruction Manual IM AW4TX Issue 5 Chlorine Transmitter AW400 Series ...
Page 69: ...67 Notes ...
Page 70: ...68 ...