Product category:
Gas, Chemical, Radiation and Magnetic Sensors
News Release from: Emerson Process Management - Rosemount Analytical | Subject: Steam Sterilisable Sensors
Edited by the Engineeringtalk Editorial
Team on 31 March 2000
New sensors for the Bio-Pharm and Food
industries
New analytical sensors for the Bio-Pharm and Food industries have been introduced by Rosemount Analytical, for measurement of dissolved oxygen, pH and conductivity.
have been introduced by Rosemount Analytical, for measurement of dissolved oxygen, pH and conductivity These sensors are suitable for steam-in-place cleaning on plant, or probes can be retracted without disturbing the process, for autoclave steam sterilisation
This article was originally published on Engineeringtalk on 12 Mar 2001 at 8.00am (UK)
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Significant advances in membrane technology and sensor design have extended the life of these sensors in such demanding applications, so making the overall "cost of ownership" very attractive.
The dissolved oxygen sensors, Models Hx 438 and Gx 448, have an innovative double layer membrane system, made from Teflon and stainless steel, which allows high pressure use with a fast response.
Tests have shown the new cell to maintain performance regularly through 30 cycles of steam cleaning, with a typical 50 cycle life.
Previous DO sensors with conventional membranes would only occasionally achieve a 10 cycle life.
The new designs of pH sensor, Hx338/348, feature "Tri-triple" reference technology.
This uses a triple junction sensor, where the first junction itself is made up of three peripheral mini-junctions, to resolve the potential flow sensitivity problem.
The second and third junctions and the electrolyte inhibit the effect of poisoning ions, protecting the reference element and increasing sensor life.
With cell constants suitable for high purity water through to plant water, the Rosemount Analytical Model 403 conductivity sensor is also manufactured from FDA compliant materials, and available with 1.5in or 2in Tri-Clover fittings.
Steam sterilisation can be carried out up to 135°C.
Associated mounting hardware, allowing sensor insertion and retraction without disturbing the process, and an industry specified cable guard system, to protect the connections and avoid cable threading problems, provides a complete solution for fermentation plant, bioreactors, blood processing, beer and starch processing - wherever monitoring is required with steam-in-place or sterilisation procedures.
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