Technical Guidance
Field guides, calibration procedures, and technical notes for chlorine sensor operators and engineers.
Monochloramine vs Total Chlorine: What Your Residual Reading Isn’t Telling You
A single total chlorine number can describe a healthy residual or one that is already failing. Why the species matters, the role of the chlorine-to-ammonia ratio, and how direct monochloramine measurement resolves what total chlorine cannot.
By Travis Silveri, Halogen Systems Inc.
Continuous Monochloramine Monitoring: Early Warning of Nitrification
By the time a total chlorine grab sample confirms a residual has dropped, nitrification has usually been running for weeks. How continuous in-pipe monochloramine data surfaces the leading indicators days earlier.
By Travis Silveri, Halogen Systems Inc.
What Is the Best Chlorine Sensor?
For most drinking-water, wastewater, and building applications, the reagent-free, self-cleaning Halogen MP-5F leads on maintenance, cost, and reliability — model-specific service intervals at site-specific service costs.
By Halogen Systems Inc.
What Is the Best Chlorine Sensor for Distribution Systems?
The MP-5F paired with the battery-powered BTSB Smart Box: flow-independent at dead ends and tanks, self-cleaning, model-specific service intervals, with cellular cloud alerts at a site-specific operating budget.
By Halogen Systems Inc.
Best Chlorine Analyzer When Manganese and Iron Are Present
Fe/Mn deposits foul membrane and electrode sensors, so they under-read and the control loop over-doses. An independent five-month Wessex Water evaluation found the self-cleaning MP5 ran maintenance-free while exposing 10.67% per-cycle over-dosing.
By Halogen Systems Inc.
Your Chlorine Sensor Is Lying to You — Here's 65 Days of Proof
A compelling data-driven look at how conventional chlorine sensors drift and misreport over time, with 65 days of side-by-side comparative data.
By Halogen Systems Inc.
Technical Guidance Note: DPD and Total Chlorine Calibration
Detailed technical guidance on calibrating total chlorine measurements using DPD reference methods. Covers procedure, tips, and common errors. Version 1.2.
By Halogen Systems Inc.
Simple Guide: DPD and Total Chlorine Calibration
A straightforward field guide for operators performing DPD-based total chlorine calibration. Written for technicians — plain language, step by step. Version 1.0.
By Halogen Systems Inc.
Calibrating Total Chlorine with Free Chlorine
Explains the relationship between total and free chlorine measurements and how to use free chlorine references to calibrate total chlorine sensors accurately.
By Halogen Systems Inc.
Chlorine measurement, explained
Plain-English, fully-referenced answers to the questions operators and engineers ask most — read online, no download required.
Best Chlorine Analyzer for Drinking Water (2026)
A manufacturer-authored, source-linked comparison of online chlorine analyzers — Halogen MP-5F, Hach CL17sc, Hach CL10sc, ABB Aztec 600, and Wallace & Tiernan Depolox.
Read Onlinearrow_forwardDPD vs Amperometric Chlorine Analyzers
How the two dominant measurement methods differ in reagents, waste streams, maintenance, accuracy, and interferences — and which fits your site.
Read Onlinearrow_forwardFree vs Total vs Monochloramine
What free chlorine, combined chlorine, total chlorine, and monochloramine actually mean, plus breakpoint chlorination and which one to measure.
Read Onlinearrow_forwardWhy Chlorine Sensors Drift
The real causes of calibration drift — fouling, reagent degradation, flow and pressure changes — and how self-cleaning sensors hold their reading.
Read Onlinearrow_forwardNSF-61 Chlorine Analyzer Guide
What NSF/ANSI 61 certifies, why it matters for in-pipe drinking water sensors, and how it differs from EPA Method 334.0.
Read Onlinearrow_forwardGuides & Interactive Tools
In-depth guides, calculators, and decision tools to help you evaluate, select, and optimize your chlorine monitoring system.
The Ultimate Guide to Chlorine Analyzers
PDF GuideComprehensive guide covering everything you need to know about selecting, installing, and maintaining chlorine analyzers for water treatment applications.
Halogen Systems Buyer's Guide
PDF GuideEverything you need to evaluate and purchase the right Halogen Systems chlorine analyzer for your application, including specifications, pricing considerations, and ROI analysis.
Chlorine Sensor Savings Calculator
Interactive ToolInteractive tool to calculate your potential savings when switching to Halogen Systems amperometric chlorine sensors — includes chemical, labor, and maintenance cost analysis.
Chlorine Analyzer Technical Reference
Interactive ReferenceIn-depth technical reference covering sensor specifications, measurement principles, installation requirements, and troubleshooting for Halogen Systems chlorine analyzers.
Chlorine Analyzer Technology Selector
Interactive ToolInteractive tool to compare chlorine analysis technologies and find the best match for your water quality monitoring needs based on your specific application requirements.
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Reagentless Hach CL17 Alternatives: CLF10sc vs In-Pipe Sensors
Compare reagentless CL17 replacement options: Hach CLF10sc membrane panels and Halogen in-pipe sensors. Evaluate sample drains, maintenance and pilot requirements.
Read the guide →Chlorine Analyzer Water Savings & Carry-Water Flow
Calculate chlorine analyzer drain and carry-water savings. Compare sample-line flow, travel time and NSF/ANSI 61 in-pipe monitoring for water utilities.
Read the guide →ORP vs Chlorine Sensors: What Each Reading Means
Compare ORP and direct chlorine sensors. Learn why millivolts do not translate into a universal chlorine ppm value and which measurement your process needs.
Read the guide →Why pH Affects Free Chlorine Sensor Readings
Understand pH compensation in amperometric free chlorine sensors, flow-cell requirements and how to diagnose changing residual readings before recalibration.
Read the guide →Chlorine Sensor Calibration, Cleaning & Zero Checks
Plan chlorine sensor calibration, DPD verification, zero checks and electrode cleaning. Separate drift troubleshooting from model-specific maintenance procedures.
Read the guide →Membrane vs Membrane-Free Chlorine Sensors
Compare reagentless amperometric sensor designs, membrane caps, electrolyte and maintenance costs with online DPD chlorine analyzers before choosing a system.
Read the guide →Chlorine Sensor Outputs: 4–20 mA, Modbus & IoT
Specify chlorine sensor integration with 4–20 mA, Modbus RTU, PLCs and IoT gateways. Understand scaling, fault handling and Arduino or Raspberry Pi interfaces.
Read the guide →