The H2 Chlorine Sensor
Our second-generation reagentless chlorine sensor. A redesigned wet-end delivers years-long wear life, single-cycle priming, and a chlorine sensor you can service in the field — with sharper monochloramine accuracy out of the box.
NSF-61
The H2 takes every lesson from thousands of field hours and turns it into a sensor that is easier to service, lasts longer between maintenance, and delivers tighter accuracy — without giving up the reagentless, membrane-free simplicity operators rely on.
What Your Operation Will Feel
Longer life, faster priming, and serviceable in the field — the redesign operators asked for.
Years-Long Wear Life
PEEK bearing-grade wear parts run for years — only the balls ever need replacing. In testing, the H2 ran four weeks dry with zero failures, where the previous generation lasted four days.
Primes in a Single Cycle
The redesigned wet-end primes in one cycle where the prior generation averaged four. That means faster startups, quicker recovery after air exposure, and shorter service calls.
Field-Serviceable Chlorine Sensor
Potted, polished chlorine sensors are engineered for field replacement and ship factory pre-calibrated. Swap in the field and go — less downtime and a lower cost of ownership.
Sharper Monochloramine Accuracy
New monochloramine calibration factors deliver more accurate mono readings straight out of the box — no bench tuning required.
Redesigned pH & Cover
A no-thread pH sensor and a gasket-free tongue-and-groove cover make routine service faster and more reliable, with fewer parts to seat and seal.
Built to Keep Reading
A longer impeller resists metal filings and the self-cleaning system keeps the sensor surface clear — accurate readings whether wet-tapped, side-stream, or immersed.
Still Reagentless. Still No Membranes.
The H2 keeps the proven three-electrode amperometric core — no reagents to replenish, no membranes to replace, and a self-cleaning system that keeps the sensor surface clear without operator intervention. Five parameters, one probe, a reading every 60 seconds.
Technical Specifications
| Specification | Value |
|---|---|
| Sensing Method | Reagentless 3-electrode amperometric (no membrane) |
| Free Chlorine Range | 0 – 20 ppm |
| Limit of Detection | 10 ppb |
| Resolution | 0.001 ppm |
| Accuracy | ±5% (pH 6.5 – 8.75) |
| Calibration Stability | 6 months typical |
| Measurement Interval | 60 seconds |
| Parameters | Free Chlorine, pH, ORP, Conductivity, Temperature |
| Temperature Range | 1 – 55 °C (34 – 131 °F) |
| Pressure Limit | 10 bar (145 psi) |
| Conductivity Range | 50 – 10,000 µS/cm |
| Certifications | NSF/ANSI 61 |
Frequently Asked Questions
What is the H2 chlorine sensor?
The H2 is Halogen’s second-generation reagentless multiparameter chlorine sensor. It builds on a decade of MP5 deployments with a redesigned wet-end that delivers years-long wear life, single-cycle priming, a field-serviceable chlorine sensor, and sharper monochloramine accuracy.
What parameters does the H2 measure?
The H2 measures free chlorine, pH, ORP, conductivity, and temperature from a single probe — no reagents and no membranes.
How long do the wear parts last?
The H2 uses PEEK bearing-grade wear parts engineered to run for years. Only the balls are consumable. In dry-running tests the H2 lasted four weeks with zero failures, compared with four days on the previous generation.
Can the chlorine sensor be replaced in the field?
Yes. The potted, polished chlorine sensor is designed for field replacement and ships factory pre-calibrated. Operators swap it on-site with no bench calibration and minimal downtime.
Is the H2 compatible with existing Halogen systems?
Yes. The H2 keeps the same operational philosophy and D20 controller compatibility as the MP5, making it a natural upgrade path for existing deployments.
Is the H2 NSF-61 certified?
Yes. The H2 is NSF/ANSI 61 certified for use in contact with drinking water.
Ready to put the H2 to work?
Request a quote, schedule a demo, or talk to our engineering team about the H2 for your application.