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Technical Data Sheet
LIQ-TDS-Toroidal-Conductivity
Toroidal Conductivity Sensor Addendum
Transmitter Compatibility
May 2017
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Toroidal Conductivity Sensor Addendum
Rosemount 56, 1056, and 1066 Transmitters
Measurement Choices
Conductivity, resistivity, total dissolved solids, salinity,
% concentration
Salinity: Uses practical salinity scale
Total dissolved solids: Calculated by multiplying conductivity at
25 °C by 0.65
% Concentration selections *: 0-12% NaOH, 0-15% HCl,
0-20% NaCl, and 0-25% or 96-99.7% H
Temperature Compensation Options
Manual slope (X%/°C), neutral salt (dilute sodium chloride)
Repeatability
±0.25% ±5 μS/cm after zero cal
2SO4
May 2017
.
Input Filter
Time constant 1-999 seconds, default 2 seconds
Response Time
3 seconds to 100% of final reading
* The conductivity concentration algorithms for these
solutions are fully temperature compensated.
Contents
Rosemount 56, 1056, and 1066 Transmitters . . . . . . . . 2
Rosemount 5081 Transmitter . . . . . . . . . . . . . . . . . . . . . . 4
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May 2017
Toroidal Conductivity Sensor Addendum
Table 1. Rosemount 56, 1056, and 1066 transmitter temperature specifications
Temperature Range -13 to 410 °F (-25 to 210 °C)
Temperature Accuracy, Pt-100, -25 to 50 °C ±0.5 °C
Temperature Accuracy, Pt-100,50 to 210°C ±1 °C
Table 2. Rosemount 56 and 1056 transmitter loop performance with Rosemount 228 and 225 sensors
Conductivity range
1 μS/cm to 15 μS/cm
15 μS/cm to 1500 mS/cm
1500 mS/cm to 2000 mS/cm
Loop performance
(Following calibration)
± 15 μS/cm outside low
recommended range
± 1% of reading ±10 μS/cm in
recommended range
± 5% of reading outside high
recommended range
Table 3. Rosemount 1066 transmitter loop performance with Rosemount 228 and 225 sensors
Conductivity range
15 μS/cm to 1500 mS/cm
1500 mS/cm to 2000 mS/cm
Loop performance
(Following calibration)
± 1% of reading ±15 μS/cm in
recommended range
± 5% of reading outside high
recommended range
Table 4. Rosemount 56 and 1056 transmitter loop performance with Rosemount 226 sensors
Conductivity range
1 μS/cm to 5 μS/cm
5 μS/cm to 500 mS/cm
500 mS/cm to 2000 mS/cm
Loop performance
(Following calibration)
±5 μS/cm outside low
recommended range
±1% of reading ±5 μS/cm in
recommended range
±5% of reading outside high
recommended range
Table 5. Rosemount 1066 transmitter loop performance with Rosemount 226 sensors
Conductivity range
15 μS/cm to 500 mS/cm
500 mS/cm to 2000 mS/cm
Loop performance
(Following calibration)
± 1% of reading ±5 μS/cm in
recommended range
± 5% of reading outside high
recommended range
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Toroidal Conductivity Sensor Addendum
Table 6. Transmitter loop performance with Rosemount 222 sensors
May 2017
Transmitter model Conductivity Range
Rosemount 1056/56
500 μS/cm to 2000 mS/cm
Rosemount 1066
Loop performance
(Following calibration)
± 4% of reading in
recommended range
± 4% of reading ±5 mS/cm
in recommended range
Table 7. Transmitter loop performance with Rosemount 242 sensors
Transmitter model Conductivity Range
Rosemount 1056/56
100 μS/cm to 2000 mS/cm
Rosemount 1066
Loop performance
(Following calibration)
± 4% of reading in
recommended range
± 4% of reading ±5 mS/cm
in recommended range
Rosemount 5081 Transmitter
Rosemount 5081 Transmitter Loop Specifications
Loop Accuracy: With a standard Rosemount 228 or 225 sensor and 20 ft. cable, laboratory accuracy at 25 °C can be as good as ± 2%
of reading and ±50 μS/cm.
To achieve optimum performance, standardize the sensor in the process at the conductivity and temperature of interest. Results
under real process conditions, at different temperatures, or using other sensors may differ from above.
RTD Accuracy: Utilizing a perfect 100 Ohm RTD after 1 point temperature standardization, temperature reading can be as good as ±
0.5 °C
Table 8. Rosemount 5081 transmitter specifications at 25 °C
Accuracy ± 1.0% of reading
Repeatability ±0.25% of reading
Stability 0.25% of output range per month, non-cumulative
Ambient temperature coefficient ± 0.1% of reading ± 2 μS/cm per °C
Temperature slope adjustment 0 to 5% per °C
Table 9. Recommended conductivity ranges for Rosemount 228 sensor with Rosemount 5081 transmitter
Nominal cell constant 3.0/cm
Minimum conductivity 200 μS/cm
Maximum conductivity 2,000,000 μS/cm
Values shown are for 25° conductivity with a temperature slope
of 2% per °C. The maximum range value will be lower for
solutions with a higher temperature slope.
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May 2017
Toroidal Conductivity Sensor Addendum
Table 10. Recommended conductivity ranges for Rosemount 226 sensor with Rosemount 5081 transmitter
Nominal cell constant 1.0/cm
Minimum conductivity 50 μS/cm
Maximum conductivity 1,000,000 μS/cm
Values shown are for 25° conductivity with a temperature slope
of 2% per °C. The maximum range value will be lower for
solutions with a higher temperature slope.
Table 11. Recommended conductivity ranges for Rosemount 225 sensor with Rosemount 5081 transmitter
Nominal cell constant 2.7/cm
Minimum conductivity 200 μS/cm
Maximum conductivity 2,000,000 μS/cm
Values shown are for 25° conductivity with a temperature slope
of 2% per °C. The maximum range value will be lower for
solutions with a higher temperature slope.
Table 12. Recommended conductivity ranges for Rosemount 222 sensor with Rosemount 5081 transmitter
Nominal cell constant 6.0/cm (1in.)or 4.0/cm (2 in.)
Minimum conductivity 500 μS/cm
Maximum conductivity 2,000,000 μS/cm
Values shown are for 25° conductivity with a temperature slope
of 2% per °C. The maximum range value will be lower for
solutions with a higher temperature slope.
Table 13. Recommended conductivity ranges for Rosemount 242 sensor with Rosemount 5081 transmitter
Nominal cell constant
Minimum conductivity 100 μS/cm
Maximum conductivity 2,000,000 μS/cm
Values shown are for 25° conductivity with a temperature slope
of 2% per °C. The maximum range value will be lower for
solutions with a higher temperature slope.
1. Values depend on sensor configuration and wiring.
(1)
(1)
(1)
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Toroidal Conductivity Sensor Addendum
LIQ-PDS-Toroidal-Conductivity
Technical Data Sheet
May 2017
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