Reverse Osmosis Filter Monitoring

Introduction

Reverse osmosis (RO) process technology is deployed in many industries. This process uses membrane separation which is one of the most economical means to remove suspended solids from feed water. Listed below are examples of some typical RO applications:

  • Pretreatment for deionizers for ultra pure water, typically used in the semiconductor industry
  • Production of zero-hardness water used for boiler feed water
  • Treatment of sanitary waste
  • Water purification

The RO function is accomplished by differential pressure across an array of filters. High pressure is applied to the raw water side of the filter that creates sufficient differential pressure across the filter enabling flow of the filtered water to the low-pressure side of the system.

Plant with Filter arrays and Storage tank

 

Expected benefits

  • Accurate differential pressure measurement is key to filtered water quality.
  • Transmitter range flexibility reducing inventory with fewer models required for RO system designs.
  • Robust Transmitter design delivering stable output under demanding process conditions.
EJA110E Differential Pressure Transmitters

Challenges

In this semiconductor factory they produce their own deionized water. A cellulose acetate membrane removes dissolved solids from the filtered raw water. Differential pressure values are the key factor determining filter maintenance intervention for cleaning or replacement of filter components.

Application requirements:

  • Pressure transmitter must have accurate measurement.
  • Pressure transmitter able to withstand plant vibration with more reliable performance than Pressure switches traditionally used.
  • Pressure transmitter to deliver long term stability regardless of harsh process conditions of pressure surges and fluctuations that caused zero-point shift and drift with other transmitter brand’s previously used on site.
  • Reduce maintenance activities and costs where possible.

 

Solution

EJA110E medium range unit was chosen to cover the measurement range 0 to 30 kPa (0 to 120 inH2O). The client focused on 0.055 % accuracy of capsule span, superior long-term stability (≤± 0.1 % @ 16 MPa, 2300 psi) and vibration tolerance.

Static pressure transient test data

【Static pressure transient test data】
Model: EJA110E M capsule with set range -2 to 2 kPa
Applied static pressure change: 500 kPa in 0.1 Sec

With sudden static pressure changes, the output from EJA110E responds stably and keeps zero every time.

 

Conclusion

DPharp EJA110E exhibits exceptional stability. Trial results from an EJA110E on this RO process that was evaluated over 6 months presented no zero drift or shift. Maintenance crews were relieved with no maintenance intervention or action required during the evaluation period. The EJA110E consistently delivers accurate and stable measurement of process conditions under real world conditions, resulting in better process efficiency and less maintenance downtime.

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Absolute Pressure

Absolute Pressure transmitters compare a pressure relative to Absolute pressure. Absolute pressure is always a positive value.

Diaphragm Seal System

Diaphragm Seal System can be used to measure liquid, gas, or steam flow as well as liquid level, density, and pressure.

Differential Pressure

Differential Pressure (DP) is defined as the difference between two pressures. Differential Pressure Transmitters use a reference point called the low-side pressure and compare it to the high-side pressure. Ports in the instrument are marked high-side and low-side.

Draft Pressure

Draft Pressure transmitters are a unique type of differential transmitter that is designed to measure small differences in very low static pressure environments.

Gauge Pressure

Gauge Pressure transmitters compare a pressure relative to atmospheric measure.

Hygienic Pressure Transmitters

Hygienic Pressure Transmitters are designed to fulfil the requirements of hygienic and pharmaceutical application.

Liquid Level

Accurate level readings are essential to the safe, reliable, profitable operation of your plant. Liquid Level transmitters measure differential pressure to infer the level in a vessel.

Low Flow

Using Bernoulli's equation, Differential Pressure transmitters can be used to infer the flow of fluid through a pipe.

Mass Flow (Multivariable)

There are several technologies on the market to measure mass flow. One is the Multi-variable Pressure Transmitter.

Multi-Sensing

A Multi-Sensing transmitter combines transmitters for Differential Pressure, Gauge Pressure, and Temperature into one field instrument.

Pressure Transmitters

The accurate and stable measurement of process pressure with Yokogawa Pressure Transmitters supports the safe, reliable, and profitable operation of your plant.

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