Product category:
Liquid Analysis: pH, Conductivity, ISE
News Release from: Mettler Toledo | Subject: ISM pH electrode
Edited by the Processingtalk Editorial
Team on 25 January 2008
Optimised sour water control with ISM pH
electrode
The installation of a double measuring system - pH combined with conductivity - allows control of the aggressive sour water on-line without damaging the pH electrodes
Sour water is poisonous to equipment on a petrochemical plant, because it is responsible for most of any of the corrosion processes in metallic pipes, heater, coolers and columns: it must be treated and neutralised In the past, customers used standard pH measuring systems to control the sour water and the neutralisation treatment
This article was originally published on Processingtalk on 5 Jun 2008 at 8.00am (UK)
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The situation was not satisfactory at all, because of the contamination of the electrode due to the presence of gasoline, which also passes through the pipe.
As the pH electrodes were constantly damaged by the presence of gasoline in the measurement media, customers stopped performing the on-line analysis and started conducting it in the laboratory.
As a pH measurement is very important to control the chemical addition, in order to neutralise the sour water, and to protect the pipe lines and equipment from corrosion, Mettler Toledo offers an innovative solution which makes it possible to carry out on-line pH measurement with unique diagnostics capabilities.
Further reading
ISM analytical sensors are easy to maintain
Breakthrough technology from Mettler Toledo allows users of process analytical equipment to reduce maintenance costs of pH and other measurement loops, using Intelligent Sensor Management technology
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Weighing specialist Mettler Toledo has helped oil and gas services contractor RBG to reduce the amount of oil contamination in solids recovered from offshore production operations in the North Sea
Automated pH sensor cleaning minimises maintenance
In a paraffin wax refining process, measurement of pH and ORP values was optimised using Mettler Toledo electrodes, in association with an electrode cleaning and calibration system
The measurement system includes a pH electrode and a conductivity sensor.
The following products were installed:.
* InPro 4260 i ISM pH electrode.
* InPro 7250 inductive conductivity sensor.
* M 700 transmitter.
* Retractable housing for the pH electrode.
We recommend using the conductivity sensor to protect the pH electrode from gasoline.
There are two moments in which the pH electrode is retracted.
* When it is washed .
* When gasoline is passing through the pipe.
The conductivity sensor is used to verify which substance is passing through the pipe.
Since water is salty, its conductivity is very high, whereas the gasoline conductivity is very low.
When the conductivity drastically decreases, it means that gasoline is passing through the pipe, and therefore the pH electrode must be retracted so it is not damaged.
Therefore, not only is the conductivity sensor used to verify phase separation, which is a classic application for a conductivity sensor, but also this information is used to control the insertion and retraction of the pH sensor, protecting the sensor from contamination.
The InPro 4260 i ISM electrode is best suitable for this application due to the high concentration of sulphur.
As the pH electrode has the ISM technology, it is possible for the user to do a much easier maintenance by using precalibrated sensors and on-line diagnostics.
ISM surpasses customer expectations and it is something which differentiates Mettler Toledo sensors from other suppliers.
The retractable housing is chosen due to the importance of the pH electrode automatic cleaning.
The use of pneumatic retractable housing allows the automation of cleaning.
The M700 was the choice to send both conductivity and pH signals to the same transmitter.
The on-line pH measurement is only made possible in conjunction with the conductivity sensor which protects it from gasoline media.
The neutralisation control by the pH measurement is very important as a way to avoid corrosion in the process.
Doing this measurement just in the laboratory can be very risky, because the addition of neutralising agents is carried out manually and contaminated water can already be sent to the pipes before it is neutralised.
By doing an on-line measurement with the pH electrode being protected by a conductivity electrode, it is possible to respond to pH variation automatically and just in time that this sudden changes occur.
Due to high sulphur concentration, InPro 4260 i ISM was chosen and it has been presenting a step ahead in the customer expectations regarding product performance.
Additionally, the ISM concept is making the maintenance programming easier as well as the customer inventory control.
* The new innovative digital Mettler Toledo "Intelligent Sensor Management" concept makes it easier to operate process analytical systems from initial installation to maintenance right through to sensor exchange.
ISM technology enables you to lower maintenance costs and reduces the risk of sensor failure while improving process reliability.
ISM enables a quick and easy installation thanks to "Plug and Measure", offers the pre-calibration of pH electrodes and oxygen sensors in the laboratory, and optimises the maintenance of the sensor. Request a free brochure from Mettler Toledo ...
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