Single and dual input analyzers for pH/Redox (ORP)
AX416, AX436, AX460, AX466 & AX468 4Setup
IM/AX4PH Rev. P 23
4.1.4 Automatic, Single- and Two-Point Calibration (pH Only)
Sensor A: Buffer Method (pH probes only)
Select the type of automatic calibration required:
Auto 1-Pt
Auto 2-Pt
–
–
Automatic, single-point calibration
Automatic, two-point calibration
Calibrate Buffer (Single-Point Calibration) or Calibrate Buffer 1(Two-Point Calibration)
Immerse Sensor A in the buffer solution.
Press the key to initiate calibration.
Note. To abort calibration, press the key again at any time before calibration is
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.
Single-point calibration selected – continued on next page.
Abort Calibration
Select Yes or No.
Yes selected – return to the main menu.
No selected – calibration continues.
Calibration
Message
Min. Max. Explanation Action
Calibration
Passed
40 to 70 % 105 % The new calibration coefficients are accepted None
Calibration
Low Slope
60 to 90 % 60 to 90 % The new calibration coefficients are accepted
The electrode pair are becoming fatigued
– replacement is recommended
Calibration
Failed
0% 40 to 70 %
The new calibration coefficients are ignored and the
last known valid calibration coefficients are used
Check buffer values and repeat buffering.
If the fault persists, replace the electrodes
Table 4.1 Calibration Messages
#### 100% ####
175
mV
A: Immerse Buf.2
A: Calibration
A: Abort Cal.
-----
Yes
A: SENSOR CAL.
A: Immerse Buf.2
A: Immerse Buf.1
4.00
pH
Deg.C
25.0
A: Buffer Method
Auto
-----
1-Pt
A: Cal. Buffer 1
4.01
pH
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