T14.0.0X.6C-02
User’s Manual GLMU 200 MP
page 4 of 8
Arrow to Temp indicates
temperature display
4 Operation
4.1 General informations about the conductivity measuring
4.1.1 The standard measurung cell
During the measurement, the conductivity probe must be be dipped at least 30mm into the medium.
At the one hand to allow a reproducable electrical field around the measuring cell, at the other hand to allow
the temperature sensor (located in metall cover within the measuring cell) to adjust to the medium
temperature.
When changing between different solution the probe should be rinsed thoroughly.
Measuring cell must never come into contact with water-repellent materials such as oil or silicone!
If conductivity measured is much higher or lower than expected this may be due to the electrode being soiled
with nonconducting or conducting residues. In this case the measuring cell has to be cleaned with a watery
soap solution.
Especially when measuring media with low conductivities the electrode the media should flow at sufficient
speed though the cell.
4.1.2 Salinity
measuring
The salinity (salt content) of seawater can be determined in the measuring mode „SAL“ (basis: International
Oceanographic Tables; IOT)
The salinity of standard-seawater is 35 ‰ ( 35g salt per 1kg seawater).
The values are displayed in ‰ (g/kg).
4.1.3 TDS
measuring
At the TDS measuring the dry residues or
t
otal
d
issolved
s
olids value is caculated by means of the
conductivity and a calculation factor (C.tdS). This factor has to be evaluated for the refering type of solution.
The values are displayed in mg/l.
4.2 Display functions
4.2.1 Currently measured values
During normal operation
the conductivity display value
is displayed.
By short press of key ‘SET’ (1) the
temperature
in
[°C]
will displayed vor 10 seconds.
display of conductivity value
display temperature
4.2.2 Min/Max Value Memory
watch Min values (Lo):
press ‘down‘(2) shortly once
display changes between ‘Lo‘ and Min values
watch Max values (Hi):
press ‘up‘(3) shortly once
display changes between ‘Hi‘ and Max values
restore current values:
press ‘down‘(2) or ’up’(3) once again
current values are displayed
clear Min-values:
press ‘down’(2) for 2 seconds
Min values are cleared. The display shows shortly ‘CLr‘.
clear Max-values:
press ‘up’(3) for 2 seconds
Max values are cleared. The display shows shortly ‘CLr‘.
After 10 seconds the currently measured values will be displayed again.