wtw LF 340 - Page 56

LF 330
LF 340
Technical data Technical data
LF 330
LF 340
56
57
Conductivity measurement
(Pay also attention to the technical data of the measuring cell)
AutoRange = Automatic selection of measuring ranges
Measuring ranges:
Measuring range 1
Resolution
Measuring range 2
Resolution
Measuring range 3
Resolution
Measuring range 4
Resolution
Measuring range 5
Resolution
Measuring range 6
Resolution
Measuring range 7
Resolution
Accuracy
0.000 ... 1.999 µS/cm (c = 0,01 cm
-1
only)
0.001 µS/cm
0.00 ... 19.99 µS/cm (c = 0,01 cm
-1
and
c = 0,1 cm
-1
only)
0.01 µS/cm
0.0 ... 199.9 µS/cm
0.1 µS/cm
0 ... 1999 µS/cm
1 µS/cm
0.00 ... 19.99 mS/cm
0.01 mS/cm
0.0 ... 199.9 mS/cm
0.1 mS/cm
0 ... 500 mS/cm
1 mS/cm
± 1 % of measured value ± 1 digit with ambient
temperature 15°C ... 35°C
Cell constant Setting ranges: 0.01 cm
-1
fixed
0.1 cm
-1
fixed
0.45 ... 1.30 cm
-1
adjustable
Reference temperature 20°C or 25°C selectable.
Temperature compensation automatically, 3 modes selectable:
1. Linear compensation ( ),
coefficient adjustable beetween 0.5 %/K and
3.00 %/K in the range of -5 ... 90°C.
2. Compensation of natural water ( )
acc. to EN 27888 (replaces DIN 38404),
Ultrapure water function for neutral water;
Coefficients fixed.
3. No compensation.
Accuracy:
(at operation temp.
-10°C ... +55°C)
1. Linear compensation ( ):
0.5 % of meas. value ± 1 digit for
Ž TC: α = 0.5 ... 2.5 %/K and test sample
temperature +5°C ... 75°C and
Ž TC: α = 2.5 ... 3.00 %/K and test sample
temperature 10°C ... 75°C.
2. Non-linear compensation ( ):
0.5 % of meas. value ± 1 digit for test sample
temperature 0 ... 35°C.
For test sample temperature 35 ... 50°C
expanded nLF-function acc. to WTW
measurements.
3. No compensation:
0.5 % of meas. value ± 1 digit for test sample
temperature -5 ... +99.9°C.
Salinity measurement
(Pay also attention to the technical data of the measuring cell)
Measuring range
Resolution
Accuracy
0.0 ... 70.0 according to IOT table
(Source: "UNESCO Technical Papers in
marine sciences 36")
0.01
± 0.1 in the range 0.0 ... 42.0 with 5°C ... 25°C
± 0.2 in the range 0.0 ... 42.0 with 25°C ... 30°C
TDS
Range:
Resolution:
Accuracy:
0 ... 1999 mg/l
1 mg/l
± 2% ± 1 digit at test sample temperature
15°C ... 35°C
Factor adjustable between 0.40 ... 1.00
Temperature
(Pay also attention to the technical data of the probes)
Measuring range
Resolution
Accuracy
Usable probes
Temperature input
-5 ... 99.9°C
0.1 K
0.1 K ± 1 digit
30 KOhm NTC integrated in the probes
-20 ... 130°C