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03 MONITOR · Process Monitoring & Instrumentation

Water Quality Monitoring

Quick answerWater quality instruments measure what is dissolved in water, continuously. TDS and conductivity show RO and DM performance, pH and ORP control dosing and effluent quality, and online controllers combine readings with alarms and relay outputs. Filtsap supplies panel and field-mount instruments with sensors.
Online TDS Meters

Online TDS Meters

Panel-mount TDS indicators with probes for RO permeate and feed.

Conductivity Meters

Conductivity Meters

µS/cm to mS/cm ranges for DM, RO and boiler feed water.

pH Meters

pH Meters

Online pH transmitters and controllers for dosing and ETP outlets.

ORP Meters

ORP Meters

Measure oxidation-reduction potential, e.g. chlorine before RO.

Online Water Quality Controllers

Online Water Quality Controllers

Multi-parameter controllers with alarms, relays and 4–20 mA outputs.

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FAQs

Why monitor ORP before an RO membrane?

A high ORP (above about 200–250 mV) signals residual chlorine, which damages polyamide RO membranes. An ORP meter can trip the plant or raise SMBS dosing.

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