Pr
o
Minent
®
Page 85
Slope
Test
IMPORTANT
• Always follow the handling instructions below.
• During calibration the water sample must be fl owing evenly without bubbles or tur bu-
lence or at a standstill.
• If calibrating in fl owing water, the electrolytic conductivity of the water sample must be
constant.
• The axis through the bore of the sensor tip must line up with the direction of the fl ow.
Cover the sensor tip completely with the water sample (immerse or fl ood the environment)
There are now three alternative procedures for different require ments:
Measurement Accuracy to within approx. 10 %
Set the temperature coeffi cient
of the water sample in the “meas. parameter setting?”
setting menu (related to 25 °C. Arrow keys.) or determine using the “calibration
” setting
menu (see Operating instructions DULCOMETER
®
D1C, Inductive Con duc tiv i ty)
Inductive Conductivity
Enter the sensor installation factor in the “install. factor” setting menu (arrow keys). The
installation factor is “1” if the distance from the wall a of the sensor tip is greater than 30 mm.
High Measurement Accuracy
Calibration with Reference Metering Equipment
Calibration of the sensor is normally carried out once it has been installed with a reference
metering device (e.g. a hand-held meter for conductive conductivity).
Measurement Accuracy of Reference Meter
The reference metering equipment must have a corresponding measurement accuracy (see
operating instructions of the ref er ence metering equipment with respect to the measurement
range and measurement accuracy for conductivity and temperature). In order to exploit the
measurement accuracy of the sensor it must be calibrated to an accuracy of at least 1 %.
The reference metering equipment itself must be calibrated using calibration solutions with a
measurement accuracy better than ±1 % (see operating instructions of the reference metering
equip ment).
ProMinent recommends a reference metering device with a four-electrode sensor and a tempera-
ture measurement accuracy better than ±0.5 °C at 25 °C (e.g. Portamess 911 Cond (order no.
1008713) with sensor type LF 204 (order no. 1008723)) for all measurements in conductivity
range above 1 mS/cm.
CAUTION
Take suitable precautions when taking samples (safety gear ...)!
install. factor
setting ?
install. factor
0,5
100
μ
S/cm
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