Automatic, Single- And Two-Point Calibration (Ph Only) - ABB AX400 Series User Manual

Single and dual input analyzers for pH/Redox (ORP)
AX416, AX436, AX460, AX466 & AX468

4.1.4 Automatic, Single- and Two-Point Calibration (pH Only)

Auto
-----
1-Pt
A: Buffer Method
4. 0 0
pH
25. 0
Deg.C
A: Immerse Buf.1
175
mV
#### 100% ####
4. 0 1
pH
A: Cal. Buffer 1
-----
Yes
A: Abort Cal.
Calibration
Min.
Message
Calibration
40 to 70 %
Passed
Calibration
60 to 90 %
Low Slope
Calibration
0%
Failed
Table 4.1 Calibration Messages
IM/AX4PH Rev. P
Sensor A: Buffer Method (pH probes only)
Select the type of automatic calibration required:
Auto 1-Pt
Auto 2-Pt
Calibrate Buffer
Immerse Sensor A in the buffer solution.
Press the
Note. To abort calibration, press the
complete – see below.
The center display line shows the measured sensor output in millivolts.
As calibration proceeds, a progress indicator appears in the lower display line. When
the measured sensor output stabilizes, the lower display line shows
##### 100 % #####.
The display then changes for 2 seconds to show the temperature-corrected buffer
value in the upper display line, then advances automatically to the next frame.
Two-point calibration selected – continued on next page.
A: Immerse Buf.2
Single-point calibration selected – continued on next page.
A: Calibration
Abort Calibration
Select Yes or No.
selected – return to the main menu.
Yes
A: SENSOR CAL.
selected – calibration continues.
No
A: Immerse Buf.2
Max.
105 % The new calibration coefficients are accepted
60 to 90 % The new calibration coefficients are accepted
The new calibration coefficients are ignored and the
40 to 70 %
last known valid calibration coefficients are used
– Automatic, single-point calibration
– Automatic, two-point calibration
or Calibrate Buffer 1
(Single-Point Calibration)
key to initiate calibration.
Explanation
(Two-Point Calibration)
key again at any time before calibration is
Action
None
The electrode pair are becoming fatigued
– replacement is recommended
Check buffer values and repeat buffering.
If the fault persists, replace the electrodes
4 Setup
23