wtw LF 170 - Measurement Characteristics

LF 170 Technical data
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ba54104e09 11/2010
8.2 Measurement characteristics
8.2.1 Conductivity measurement
Adjustable
temperature
compensation
Connectable conduc-
tivity measuring cell
Two- or four-electrode measuring cells
Display and
measuring range
Adjustable (depending on the measuring cell
type):
– 0.000 ... 1.999 µS/cm
– 0.00 ... 19.99 µS/cm
– 0.0 ... 199.9 µS/cm
– 0 ... 1999 µS/cm
– 0.00 ... 19.99 mS/cm
– 0.0 ... 199.9 mS/cm
– 0 ... 1000 mS/cm
– Auto (automatic meas. range selection)
Resolution Depending on the measurement range:
– 0.001 µS/cm ... 1 mS/cm
Accuracy 0.5 % of measured value ± 1 digit
reference
temperature
Adjustable:
– 25 °C or 20 °C
"Calibration" Checking and setting the cell constant with
the control standard (0.01 molar potassium
chloride solution)
Permissible range for
the cell constant
0.090 ... 1.500 cm
-1
Compensation
procedure
Temperature range
Linear with adjustable
temperature coeffi-
cient in the range 0.50
... 3.00 %/K
0 ... 60 °C (32 ... 140 °F)
Nonlinear 5 ... 35 °C (41 ... 95 °F)
according to DIN EN 27888 / ISO 7888
35 ... 60 °C (95 ... 140 °F)
according to WTW procedure
None