Emerson Rosemount 56, Instruction Manual

Page: 16 / 136

±0.6% of reading in recommended range
+2 to -10% of reading outside high recommended range
±5% of reading outside low recommended range
±4% of reading in recommended range
1.4 Contacting Conductivity (Codes -20 and -30)
Measures conductivity in the range 0 to 600,000 µS/cm (600 mS/cm). Measurement choices are
conductivity, resistivity, total dissolved solids, salinity, and % concentration. Temperature
compensation can be disabled, allowing the analyzer to display raw conductivity.
NOTE:
When two contacting conductivity sensors are used, The 56 can derive an inferred pH value. Inferred
pH is calculated pH, not directly measured pH. Inferred pH is calculated from straight and cation con-
ductivity. It is applicable only if the alkalizing agent is NaOH or NH
3
and the major contaminant is NaCl.
It is strictly an application for power plants.
Performance Specifications - Analyzer
Measurement Range: see table below
Solution temperature compensation: manual slope (X% / °C), high purity water (dilute
sodium chloride), and cation conductivity (dilute hydrochloric acid).
Salinity: uses Practical Salinity Scale
Total Dissolved Solids: Calculated by multiplying conductivity at 25 °C by 0.65
Five percent concentration curves: 0-12% NaOH, 0-15% HCl, 0-20% NaCl, 0-25% or 96-
99.7% H
2
SO
4
. The conductivity concentration algorithms for these solutions are fully
temperature compensated.
Four temperature compensation options: manual slope (X% / °C), high purity water
(neutral salt), cation conductivity (dilute hydrochloric acid) and raw.
Input filter: time constant 1 - 999 sec, default 2 sec.
Response time: 3 seconds to 95% of final reading
Recommended Sensors for Contacting Conductivity:
All Rosemount ENDURANCE 400 series conductivity sensors (Pt 1000 RTD) and 410VP 4-
electrode high-range conductivity sensor.
Temperature range 0-200 °C
Temperature Accuracy,
Pt-1000, 0-50 °C
± 0.1 °C
Temperature Accuracy,
Pt-1000, Temp. > 50 °C
± 0.5 °C
Temperature Specifications: Cell Constant Linearity
6 Description and Specifications
Section 1: Description and Specifications Instruction Manual
April 2017 LIQ-MAN-56
Cell 0.01 S/cm 0.1 µ S/cm 1.0 µ S/cm 10 µ S/cm 100 µ S/cm 1000 µ S/cm 10mS/cm 100mS/cm 1000mS/cm
Constant
0.01
0.1
1.0
4-electrode
0.01 µ S/cm to 200 µ S/cm
0.1 µ S/cm to 2000 µ S/cm
1 µ S/cm to 20mS/cm
2 µ S/cm to 1400 mS/cm
200 µ S/cm to 6000 µ S/cm
2000 µ S/cm to 60 mS/cm
20 mS/cm to 600 mS/cm
PERFORMANCE SPECIFICATIONS
Recommended Range – Contacting Conductivity