Process Unit 73 LF - Knick

14 Specifications
Conductivity input
either 4-electrode or 2-electrode cells
Ranges
Conductivity
0.001 S/cm to 2,000 mS/cm
Resistivity (1/)
0.5 cm to 1,000 Mcm
Concentration
0.00 to 200.0 % by wt
Display range
0.1 S ⋅ c to 1,999 mS ⋅c (cell constant c = 0.0050 to 200.0 cm -1 )
Accuracy ( 1 count)
< 1 % of measured value + 0.2 S ⋅ c
max. permissible direct voltage against signal ground 2 V
(especially when using stray-field probes, equipotential bonding is
required)
Resolution
0.000 S/cm c = 0.0050 to 0.1199 cm -1
0.00 S/cm c = 0.1200 to 1.199 cm -1
0.0 S/cm c = 1.200 to 11.99 cm -1
0.000 mS/cm c = 12.00 to 119.9 cm -1
0.00 mS/cm c = 120.0 to 200.0 cm -1
Cell standardization
Operating modes*)
automatic, by cell constant determination
with NaCl or KCl solution
entry of individual conductivity values
for cell constant determination
direct entry of cell constant
calibration by sampling
Permissible cell constant 0.0050 to 200.0 cm -1
Concentration determination
(Option 359, 360, 382)
Calculation and display of concentration [% by wt.] from the
conductivity and temperature values of specified substance
solutions (see tables in annex)
customer-specific tables on request (opt. 360)
Temperature input
Pt 100 / Pt 1000 / Ni 100
2 or 3-wire connection
Range
Pt 100/1000
-50.0 to +250.0 C
Ni 100
-50.0 to +180.0 C
Accuracy ( 1 count)
Temperature compensation *)
media-dependent
Current input
Accuracy
< 0.2 % of measured value, 0.2 K
automatic with Pt 100/Pt 1000/Ni 100
manual -50.0 to +250.0 C
Operating modes:
without
linear 0.00 to 20.00 %/K, reference temperature user-defined
natural waters to EN 27888
optional: to customer specification (option 361)
ultrapure water with traces of impurity (option 392)
0(4) to 20 mA
evaluation 0 to 100 %
input resistance 50 , overload 100 mA
e.g. for limit monitoring
In conjunction with power output complete 2-wire loop,
e.g. for flow or level meter
< 1 % full scale
Specifications 14–1