Grab Calibration (Ph Only); Notes - ABB AX416 User Manual

Single and Dual Input Analyzers for pH/Redox (ORP)
AX416, AX436, AX460, AX466 & AX468

4.1.6 Grab Calibration (pH Only)

Grab
-----
A: Buffer Method
pH
9. 1 8
Deg.C
25. 0
A: Adjust Value
%
100. 0
pH
7. 0 0
A: Slope & Check
Sensor Cal. A
IM/AX4PH Issue 9
Sensor A: Buffer Method (pH probes only)
Select Grab calibration method.
Adjust Value
and are shown alternately on the upper display line. The displayed pH value is
ph Adjust
the reading sampled by the analyzer as this frame is selected and is held until the
display is advanced to the next frame. Use the
displayed value (in 0.01pH increments) to match the pH value of the measured grab
sample.

Notes.

If the displayed value is adjusted by more than ±3pH, WARNING - OFFSET is
•
shown on the lower display line. If the measured grab sample value is correct and
the analyzer reading has not been overadjusted, clean the electrode, check the
sensor connections and try again.
If the displayed value is adjusted by ±5pH, OUT OF RANGE is shown on the lower
•
display line, indicating that maximum adjustment has been reached. Further
adjustment is not possible.
Slope Value
% slope value.
The value generated during the last valid two-point calibration, between the
programmed minimum % slope value (see
displayed.
pH check value.
The value generated during the last valid two-point calibration, adjusted by the value
applied in
Adjust Value
Note. The pH check value is reset to the previous, valid check value if a single- or
two-point calibration is carried out after a grab calibration.
Sensor B calibration (dual input analyzers only) is identical to Sensor A calibration.
Sensor Cal. B
for Sensor B (dual input analyzers only) set to
SENSOR CAL. Probe Type
set to
Cals. No
Alter Sec. Code
SECURITY CODE
Alter Sec. Code
CONFIG. DISPLAY
Set Min Slope
(above), is displayed.
(Section 5.3) - return to top of page.
not set to zero (Section 5.8) - see section 5.1, page 28.
set to zero (Section 5.8) - see section 5.2, page 29.
4 SETUP
and keys to adjust the
- Section 5.3) and 105%, is
or and
Redox ORP Enable
27