Peracetic Acid Analyzer Control System

The EMEC Peracetic Acid Analyzer and Control System offers ease of use, accuracy, and reliability for the monitoring and control of Peracetic Acid in water. Using the EMEC LDSCL PLUS Peracetic Acid analyzer and controller and the latest in Amperometric Cell Technology, Peracetic Acid ppm readings are continuous and updated every second. Built-in pH, and temperature compensation are standard.
The System below consists of the Controller, Filter, Flow Cell and Peracetic Acid Sensor:

Analyzer System on Backboard

EMEC Analyzer System on Backboard

Brief System Explanation

The image on the left shows a typical installation consisting of the following devices:

  • Filter – Typically a 60 micron filter is sufficient to keep particles and debris in the process water from entering the flow cell.
  • Analyzer – The EMEC LDS PLUS series of analyzers are user-friendly, and automatically cater to the different sensors that can be attached.
  • Flow Cell – The acrylic see-through flow cell incorporates the following items:
      • Flow Sensor: on the left of the flow cell is a flow switch, and upon adequate flow the silver bullet shaped float rises and triggers the flow sensor indicating to the system that adequate flow is now present, and control functions can be activated.
      • Temperature Sensor: the RTD sensor is located above the silver bullet float, and is used for temperature readout or compensation if required.
      • Sensor: The larger green and beige probe is the Amperometric sensor for measuring the amount of Peracetic Acid in ppm and will be displayed on the Analyzer.
      • The flow cell also contains an inlet pressure and flow regulator, and an easily accessible water sample port.

Individual System Components

Model: EMEC LDSCL PLUS

Peracetic Acid Controller

EMEC Peracetic Acid Analyzer and Controller

Description

The EMEC Series LDSCL PLUS Analyzers / Controllers offer cost-effective, user friendly control of Peracetic Acid for Industrial Water Treatment applications. This controller accommodates the EMEC SCL11 Peracetic Acid Amperometric Cell, and PID Control is Standard.

The user-friendly interface limits the need for reading the detail in the instruction manuals, and if you are familiar with programming other brands of controllers, you will find this to be the cutting edge, and easiest of set-ups.

  • PID Peracetic Acid Controller
  • User Friendly Encoder wheel menu, with back-lit LCD Display
  • Control Outputs for PID 4-20mA, 2 x Pulse, & 2 x Relay
  • 4-20mA Outputs for PPM, and Temperature
  • Alarm & Probe Cleaning relays
  • Communication via Ermes Webserver or modbus
  • Optional mA or pulse water meter inputs for Feed-forward control
  • Optional Communication interfaces for Ethernet, GSM, or Modbus
  • Optional Communication interface provides Ermes Web-server access for on-line monitoring and data-logging
  • Use with EMEC Series PEF Flow Cell, and SCL9 Amperometric Peracetic Acid Sensor

Model: EMEC PEF1R

Peracetic Acid Flow Cell & Probe Holder

EMEC Peracetic Acid Sensor Flow Cell

Description

The EMEC Series PEF Flow Cells / Probe Holders are made of See-Through Acrylic PMMA Material, for long lasting use.

With the unique, easy flow design, they come standard with Flow Sensor, Flow Adjustment, Built-in Sample Port, and Vent.

  • Includes EMEC SEPR Flow sensor – Flow Indication via a Red LED
  • Built-in Temperature Sensor
  • Standard Tubing and Fittings
  • Includes Pressure & Flow Regulator
  • Flow Adjustment Knob
  • Built-in Sample Port
  • Use with EMEC SCL Series Amperometric Sensors

Model: EMEC SCL11

Peracetic Acid Amperometric Sensor

EMEC Hydrogen Peroxide Amperometric Sensor

Description

The EMEC Series SCL11 Closed Amperometric Sensors offer reliable, repeatable and accurate measurements for clean water Peracetic Acid.

With the unique membrane, measurements are almost instantaneous with the controller updating the display every second.

  • EMEC SCL Digital sensor compatible with EMEC LDSCL PLUS Controllers
  • Digital interface to controller, for Auto sensor and Range detection
  • pH, and Temperature Compensated
  • 15 PSI (1 Bar) Max Pressure
  •  Model: EMEC SCL11 Peracetic Acid Amperometric Sensor for fresh water (0-200.0 or 0-2000 ppm)

Optional Re-circulation System for Calibration

Re-circulation System

Recirculated Generic Calibration Block Diagram

Re-circulation System Brief Explanation

With water analyzer systems, it may be challenging to accurately calibrate the analyzer due to the process ppm changing from the time the sample is taken, to the time the analyzer is actually calibrated.

For example: the analyzer is reading 1.05 ppm at the time the sample is taken. Then by the time the sample is confirmed by a 3rd party measurement (hand-held or lab test) to be say 1.3 ppm, then by the time the operator comes to calibrate the analyzer, the reading might be lower or higher than 1.05 ppm, so calibrating the controller to 1.3 ppm based on the analyzer initially 1.05 ppm would now be incorrect.

To solve this problem, we can provide a closed-loop water sample to the flow cell which would provide a stable sample to be calibrated correctly. Isolation valves are used to direct the water flow in a recirculated loop to the flow cell, while isolating the incoming process water. The system consists of a re-circulation pump, valves, fittings, and tubing to suit. The container would be supplied by the customer to suit the size and location of the process.

Download the re-circulation block diagram here

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