7100E Inductive Conductivity System
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Features
Advantages at a glance. A striking feature of the Mettler-Toledo Thornton 7100E inductive conductivity transmitter is
its extremely wide measuring range of 0 - 2000 mS/cm. The unit also provides simultaneous readings of the measured value (conductivity, concentration or salinity) and temperature clearly portrayed in a well-arranged LC display, with
analog outputs for both. Status annunciators indicate the mode of operation. The AC/DC universal power capability
allows the transmitter to be connected to almost any power source.
Process safety - in the foreground. SensoCheck®continuously monitors the sender coil and wiring for short circuits,
and the receiver coil for any disruptions. GainCheck®allows a manual functional check of the transmitter at any time.
In addition, an installed background program carries out an independent, periodic check of all instrument functions. A
red LED in the front panel optically signals any alarm condition. A 22 mA alarm signal can be set in the event of a
malfunction.
Rapid connection and start-up. Plug-in terminals and front panel access allow rapid installation of sensors and output wiring. Instrument mounting configurations include wall, pipe or panel mounting. The robust plastic enclosure can
withstand the harshest process conditions with a rating of IP65, NEMA 4X.
Simple calibration. Calibration of the transmitter and sensor is carried out either through direct entry of the factory calibrated cell constant or through manual validation of the cell constant using a standard calibration solution.
Temperature may also be calibrated to provide more precise automatic temperature compensation of the measured
conductivity values.
Variety of process adaptions. The sensors can be inserted into a process pipe by means of a threaded bushing or
submerged using a support pipe and coupling.
PID proportional, integral, derivative control. Built in control enables complete loop autonomy where desired. Control
output is through relays based on pulse frequency for metering pumps or pulse duration for solenoid valves. Analog
outputs are still available for conductivity and temperature.
Applications
Semiconductor processes can be monitored with sensors of glass-filled PEEK or polypropylene and no wetted metal
parts. Process purity requirements are protected.
Waste water monitoring reliability is assured with non-fouling inductive sensors even at high conductivity and sus-
pended solids levels. Inductive sensors measure even in concentrated, zero-discharge applications.
Deionization Regeneration acid and base concentrations can be controlled reliably and accurately with inductive
conductivity measurement. Direct temperature-compensated, % by weight readout is provided for all chemicals used
for deionizer and softener regeneration.
Pharmaceutical clean-in-place (CIP) processes requiring control of chemical concentrations can use inductive
conductivity measurement. It can also be used to validate concentrations at the return end of the line and for waste
treatment.