Stratos®Pro A4... PH User Manual

Zero adjustment
Zero Adjustment (ISFET)
This adjustment allows the use of ISFET sensors with differing nominal
zero (pH only). The function is available when Sensor selection = ISFET
has been set during configuration. Zero adjustment is disabled for any
other sensors.
The adjustment is made using a zero buffer (pH 7.00).
Permitted range for buffer value: pH 6.5 ... 7.5.
Temperature-corrected input. Maximum zero offset: ± 200 mV.
Display Action Remark
Select Calibration.
Press enter to proceed.
124
Ready for calibration.
Hourglass blinks.
Immerse sensor in a pH
7.00 buffer. Enter the
temperature-corrected
pH value in the range
6.50 to 7.50 using the
arrow keys (see buffer
table).
Confirm with enter.
Stability check.
The measured value
[mV] is displayed.
The “hourglass” icon is
blinking.
Display (3 sec)
Now the device is in
HOLD mode.
If the zero offset of
the sensor is too
large (> ± 200 mV),
a CAL ERR error
message is generated.
In that case the
electrode cannot be
calibrated.
Please note:
Stability check can
be stopped (by
pressing enter).
However, this reduces
calibration
accuracy.