Xylem WTW Multi 3430, Руководство по эксплуатации

Страница: 42 / 134

Multi 3430
Operation
42
ba75865e19 04/2015
4.7.4 pH calibration
Why calibrate? During the operation of an IDS pH sensor, the zero point (asymmetry)
and slope of the sensor change with time.As a result, an inexact mea-
sured value is displayed. Calibration determines the current values of
the zero point and slope of the pH sensor and stores them in the mea-
suring instrument.
Thus, you should calibrate at regular intervals.
When do you have to
calibrate?

When the calibration interval has expired
Buffer sets for
calibration
You can use the buffer sets quoted in the table for an automatic calibra-
tion. The pH values are valid for the specified temperature values. The
temperature dependence of the pH values is taken into consideration
during the calibration.
Alternative temperature on
off
Takes the measured temperature value from
an IDS sensor.
This menu item is only available if an IDS
adapter and an IDS sensor with temperature
sensor are connected.
Temperature from channel
▭▭▬
▭▬▭
▬▭▭
Selects the channel (sensor), that provides
the measured temperature value.
This menu item is only available if an IDS
adapter and two IDS sensors with tempera-
ture sensor are connected.
pH resolution 0.001
0.01
0.1
Resolution of the pH display
mV resolution 0.1
1
Resolution of the mV display
Reset - Resets all sensor settings to the delivery
condition (see section 4.16.1)
Menu item Possible setting Description