MP5™ Wet-tap In-pipe Online Chlorine Analyzer


The Halogen MP5™ Wet-tap solution (D-H1WT-P) is a retractable deployment that allows the sensor to be inserted directly in water pipes, providing online near-time monitoring. Unaffected by changes in flow or pressure, the MP5™ is the only chlorine analyzer that can be deployed in this way.

The MP5™ is the only chlorine analyzer that is approved for NSF-61 use in drinking water pipes with no required waste stream and this deployment option takes full advantage of that approval. The included SensiCLĒNE™ technology helps stabilize calibrations and lowers maintenance requirements.

Unique Features

  • 5 Parameters in a single online near-time analyzer
    • Free Chlorine
    • pH
    • Temperature
    • Conductivity
    • Rapid Response ORP™*
  • Self-cleaning & low-maintenance
  • No membranes or electrolyte
  • NSF-61: No waste stream required
  • Factory-calibrated, drift resistant
  • Unaffected by flow or pressure. Even empty pipes won’t ruin calibration.
  • Available display is equipped with (4) 20mA and MODBUS RTU. Other communication protocols are available upon request.
  • 24 VDC or 90 to 240 VAC operation

Why Use the MP5™in a Wet-Tap Deployment?

Flow Independent Measurement 

The sensor generates its own flow. Even low-flow and end-of-line pipes can still be monitored for water aging, nitrification etc. The integrated pump creates a fixed velocity across the electrodes, which improves sensitivity while lowering the Signal-to-Noise Ratio.

No Waste Stream

Approved for NSF-61 installs, the MP5™ can be installed directly in a drinking water pipe using an operator-supplied commercial OTS saddle with a 2″ valve.

Once installed, operators gain accurate reporting of the water inside the pipe without having meters of sample tubing between the source and the analyzer, enabling faster, better decisions based on near-time data.  

Because there’s no waste stream, there’s no non-revenue water wasted for testing, making the MP5 Wet-tap Analyzer a great option for end-of-line and grid hot-spot monitoring

SensiCLĒNE™ Patented Self-Cleaning Technology

A patented electrochemical cleaning method called SensiCLĒNE™  resists polarization and adsorption of organics.  Motivated by the flow from the pump, captive polymer cleaning beads continuously abrade the sensor. This keeps the electrode surfaces, including the pH sensor, free from buildup, scaling, and biofouling. Solid metal electrodes last the life of the system. 

Easy to Monitor

A local display provides onsite viewing of parameters for up to 5 separate MP5™ units and a cellular telemetry option can cache and report at programmed intervals for off-grid monitoring.

Ease of Service

The annual wear-parts maintenance takes only minutes and does not affect calibration. Halogen’s removal tool (and available dual-drive adapter) makes installation quick and easy.

Manuals for Drinking Water & Wastewater Applications

Installation Manual

D20 Display/Controller & Sensor for use in Drinking Water and Wastewater applications.

Operating Manual

MP5 Online Chlorine Analyzer Manual (2024.06.12-v4.02) for use in Drinking Water and Wastewater applications.

Installation Manual

Installation Manual for MP5™ D-H1WT-P chlorine analyzer in Wet Tap deployment with remover tool  

Installation Manual

Download the Wear Parts Replacement manual for the SensiCLĒNE™ self-cleaning technology in MP5™ Analyzers

MP5™ Models and Deployment Types

MP5™ H1 Wet Tap (H1WT)

Halogen MP5™ HotTap/WetTap Sensors

The Wet Tap (or Hot Tap) housing can be deployed as a retractable direct pipe insertion for NSF-61 usage. No-leak retractor options are available. 

MP5™ H1 Mid Flange (H1MF-p)

Halogen MP5™ Sensors with PVC-tee Housing

The mid-flange housing (H1MF-P) and the associated 2″ adapter sleeve and collar kit make for an easy sidestream NSF-61 PVC Tee deployment.


Halogen MP5™ Sensors with two types of flow-cell housings.

The low-flange model (H1LF-P) can be used to replace existing control-board-mounted setups or used as an NSF-61 submerged in-tank analyzer.


Kit with flow-cell deployment (MKIT) and display controller along with a wall mounting plate,  provides a drop-in upfit sensor replacement.

More Information

Battery power and remote telemetry for an MP5™ deployment. Use for outer grid monitoring, dead-ends, or other remote implementations.

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Leverage the dependability and low maintenance of the MP5™ for remote tank monitoring with battery power and remote telemetry.

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Retractable remover kit for MP5™ wet-tap analyzer (H1WT-P) in water pipes allows for maintenance without interrupting flows.

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This deployment uses a water-proofed low-flange MP5™ (H1LF-P), a sourced boom and harness, or can simply be placed in a tank or trough.

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Combine a mid-flange MP5™ (H1MF-P) with an adapter sleeve—in PVC or Stainless steel—sized for deployments in a 2″ PVC tee.

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Fits low-flange MP5™ (H1LF-P) and adapts for side stream and control board usage based on which flow cell type  is ordered. 

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Both 24V DC (DC20-L) and 120-240V AC (DC20-H) versions feature (4) 4-20 mA analog outputs, and an M-12 Connector, 3 relays, SD card. 

More Information

Halogen Systems Inc's Chlorine Analyzers and Controller

Have Questions? Get Answers.

If the technologies and benefits listed above raise any questions, you may find the answer you’re looking for in the FAQ or Technologies pages. 

Our contact page also allows you to reach out with a specific question and we’ll get back to you as quickly as possible.