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Reverse Osmosis Filter Monitoring

Reverse Osmosis Filter Monitoring

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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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相关产品&解决方案

  • EJA110E

    Standard Traditional-mount Differential Pressure Transmitter based on the EJA-E Series.

  • EJA115E

    Standard Differential Pressure Transmitter attached to an IFO assembly based on the EJA-E Series.

  • EJA118E

    Standard Differential Pressure Transmitter with Remote Diaphragm Seals based on the EJA-E Series.

  • EJA120E

    Standard Traditional-mount Differential Pressure Transmitter designed for Draft Range applications based on the EJA-E Series.

  • EJA130E

    Standard Traditional-mount High Static Differential Pressure Transmitter based on the EJA-E Series.

  • EJA210E

    Standard Flange-mounted Differential Pressure Transmitter designed for Liquid-level applications based on the EJA-E series.

  • EJA310E

    Standard Traditional-mount Absolute Pressure Transmitter based on the EJA-E Series.

  • EJA430E

    Standard Traditional-mount Gauge Pressure Transmitter based on the EJA-E series.

  • EJA438E

    Standard Gauge Pressure Transmitter with Remote Diaphragm Seal based on the EJA-E Series.

  • EJA440E

    Standard Traditional-mount High Gauge Pressure Transmitter based on the EJA-E Series.

  • EJA510E

    Standard In-Line Mount Absolute Pressure Transmitter based on the EJA-E Series.

  • EJA530E

    Standard In-Line Mount Gauge Pressure Transmitter based on the EJA-E Series.

  • EJAC60E Hygienic Adapter System (Fluidless Type)

    Yokogawa introduces Fluidless series – EJAC60E Hygienic Adapter System (Fluidless Type).
    This system composes of replaceable adapters(16 adapters in total) with hygienic function of pressure detection.
    Suitable for various kind of process including hygienic connection.

  • EJX110A

    Traditional-mount Differential Pressure Transmitter based on the EJX-A Series as a high performance model.

  • EJX115A

    Differential Pressure Transmitter attached to an IFO assembly based on the EJX-A Series as a high performance model.

  • EJX118A

    Differential Pressure Transmitter with Remote Diaphragm Seals based on the EJX-A Series as a high performance model.

  • EJX120A

    Traditional-mount Differential Pressure Transmitter designed for Draft Range applications based on the EJX-A Series as a high performance model.

  • EJX130A

    Traditional-mount High Static Differential Pressure Transmitter based on the EJX-A Series as a high performance model.

  • EJX310A

    Traditional-mount Absolute Pressure Transmitter based on the EJX-A Series as a high performance model.

  • EJX430A

    Traditional-mount Gauge Pressure Transmitter based on the EJX-A Series as a high performance model.

  • EJX438A

    Gauge Pressure Transmitter with a Remote Diaphragm Seal based on the EJX-A Series as a high performance model.

  • EJX440A

    Traditional-mount High Gauge Pressure Transmitter based on the EJX-A Series as a high performance model.

  • EJX510A

    In-Line Mount Absolute Pressure Transmitter based on the EJX-A Series as a high performance model.

  • EJX530A

    In-Line Gauge Pressure Transmitter based on the EJX-A Series as a high performance model.

  • EJX610A

    High Performance In-Line Mount Absolute Pressure Transmitter based on the EJX-A Series.

  • EJX630A

    In-Line Mount High Performance Gauge Pressure Transmitter based on the EJX-A Series.

  • EJX910A

    This transmitter precisely measures differential pressure, static pressure, and process temperature; then uses these values in a high-perfomance on-board flow computer to deliver fully compensated Mass Flow.

  • EJX930A

    Designed specifically for high static pressure applications, this transmitter precisely measures differential pressure, static pressure, and process temperature; then uses these values in a high-perfomance on-board flow computer to deliver fully compensated Mass Flow.

  • EJXC40A（数字远传）

    数字远传(DRS)变送器可将二个远距离的高压侧(主机)和低压侧(次机)压力传感器，通过DRS专用通讯电缆连接进行差压测量。

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