16
METTLER TOLEDO US and Canada
www.mt.com / Thornton-Cond
Conductivity / Resistivity
METTLER TOLEDO Thornton provides a full complement of conductivity / resistivity
sensors for M300 with NPT or sanitary fittings. They include various lengths, cell
constants and materials to match the application: titanium concentric electrodes for
high purity water; monel electrodes for rinse waters containing HF; highly polished
316L stainless steel (SS) electrodes for pharmaceutical waters; CPVC and PEEK
sensors with four flush electrodes for solutions with higher conductivity and / or
suspended material; and an epoxy sensor which can also measure chemical con-
centration. Also available with “Intelligent Sensor Management” (ISM) for “Plug And
Measure” capability.
Specifications
Cell constant accuracy ± 1 %, except ± 5 % system accuracy for 4-electrode
& 10 constant
Cell constant repeatability ± 0.25 %, except ± 2 % for 4-electrode & 10 constant
Temperature sensor Pt 1000 RTD, IEC 60751, Class A, except 50 constant
Temperature accuracy ± 0.1 °C (± 0.2 °F), except 4-electrode sensors
at 25 °C (77 °F)
Cable jacket material NPT: PVC, 80 °C (176 °F) rating
Sanitary: PTFE, 200 °C (392 °F) rating
Max. sensor distance 60 m (200 ft), except 15 m (50 ft) for 244-Series
Finish N4 (R
a
< 0.2 µm / R
a
< 8 µin), 316L SS is electropolished
Insulator material PEEK (0.01 & 0.1 constant); Noryl (10 constant)
Features Overview
– Precise factory calibration and certification of each cell constant and RTD
– Optimized 4-wire measuring circuitry provides exceptional rangeability and
accuracy, eliminating cable effects
– Quick and easy installation
Typical Applications
– Pharmaceutical water
– Power and steam generation
– Semiconductor water treatment
– Recycle and reclaim water
– Wastewater treatment
For detailed information about conductivity sensors for M300:
Please refer to pages 18-19 for ordering information and drawings
Conductivity Sensors for M300
A Comprehensive Series to Meet Industry Requirements
i
Sensor Selection Criteria
Thornton offers a wide variety
of conductivity / resistivity
sensors to accomodate most applica-
tions. Use the following criteria to select
the appropriate sensor for your instal-
lation:
– Conductivity or resistivity range
– Transmitter
– Mounting type: insertion, retractable
or submersion
– Pipe connection and size
– Chemical compatibility, including
cleaning and disinfection processes
– Temperature requirements, including
steam and / or hot chemical cleaning
Conductivity / Resistivity Sensors
Accurate and Reliable
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