Level sensor monitors naphthalene
A
Krohne product story
Edited by the Engineeringtalk editorial team
Oct 8, 2007
Naphthalene has a very low di-electric constant of around 2.2 at 100C, which makes it particularly difficult to measure.
Deza has installed Krohne's Optiflex 1300 TDR radar level meter to improve the accuracy and reliability of naphthalene measurement at its plant in the Czech Republic.
Liquid naphthalene is used in the production of various chemicals.
At Deza's plant it is contained in a 3.3m cylindrical horizontal tank where it is heated to 100C before being used in production processes.
The substance has a very low di-electric constant of around 2.2 at 100C, which makes it particularly difficult to measure.
As well as improving the accuracy and reliability of level measurement in the tank, Deza needed an instrument with a two-wire connection and local indication.
It also had to be of robust design to cope with harsh conditions within the plant and be able to operate within a hazardous area.
Technicians from Krohne specified an Optiflex 1300 TDR level meter with a single 8mm diameter rod.
This configuration is resistant to the liquid naphthalene and its vapours and also allows the length of the sensor to be modified if required.
The instrument delivers a measurement accuracy of +/-3mm at a maximum allowable flange temperature of 200C, well above the actual flange temperature of 150C.
The instrument is also equipped with a local indicator and a protection cover which protects the convertor from the harsh conditions.
It is loop-powered (providing two-wire connectivity) and is flameproof to the ATEX EEx d standard.
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