Direct in-pipe chlorine monitoring

Keep the main live.
Measure where it matters.

Wet-tap configurations bring MP-5F free chlorine or MP-Total monitoring directly into your water system. Install and service the sensor through the specified isolation valve and remover assembly while the line remains in service.

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Free and total chlorine · Controlled revision 2026-10-22

Halogen wet-tap assembly installed on a horizontal distribution main — An actual Halogen installation on a distribution main.

4-inch and larger

Distribution pipelines

2-inch

Specified corporation stop

145 psi / 10 bar

Maximum approved assembly pressure

Confirm the complete sensor, valve, saddle and piping configuration for the site. Standard MP5 and MP-Total sample temperature: 0–45°C; ambient operating temperature: −10–55°C.

Where can it be installed?

From risers to vaults. See it in the field.

These installations show how the sensor, valve, remover and nearby equipment fit into real infrastructure. Open any photo for a closer look.

Wet-tap assembly on blue vertical piping beside a storage tank and controller — Tank-connected risers
A riser can provide an accessible monitoring point. Confirm flow direction and whether this location represents the water you need to measure.

City of Whittier MP5 wet-tap sensor installed on a water main in a vault — Below-grade vaults
Whittier measures directly in the main. Plan working clearance, drainage, cable protection and access to the complete assembly.

Angled wet-tap assembly on black indoor piping beside valves and plumbing — Existing pipe rooms
Fit the sensing point into existing infrastructure, with room around adjacent valves and enough clearance for service.

Whittier indoor MP5 wet-tap installation and wall-mounted D20 controller — Booster stations
The sensor stays at the process pipe while the D20 display is positioned where operators can read it.

Technician using a remover assembly at a tank-wall connection — Tank-wall service access
This field example shows removal-tool access at a tank wall. Confirm connection geometry, support and the required sensor reach for each project.

Wet-tap assembly with cabling and monitoring equipment beside piping in a vault — Remote equipment arrangements
Plan moisture protection, power and communications together. The selected electronics and enclosure must suit the site.

Lakewood wet-tap sensor and controller pictured in its original MP5 deployment report — At the well-site monitoring point
Lakewood’s published field example shows direct in-pipe measurement. Read the case study for the site-specific operating results.

Photos show different sites and hardware generations; they do not establish that every pictured sensor is MP-Total. Select the chemistry and mounting configuration for your application.

Choose the chemistry. Then choose the mount.

MP-5F free chlorine

For free-chlorine residual monitoring. The wet-tap data sheet lists the MP5A / MP-D ordering codes for the free-chlorine configuration.

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MP-Total

For total chlorine, monochloramine and free chlorine monitoring. The standard wet-tap ordering code is MP-T-H2WT-P; extended configurations use MP-T-H2WT-P-L2 or -L3.

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Plan the installation

A good sensing point includes room to service it.

The remover retracts the sensor through the specified 2-inch corporation stop. Extended 4-inch and 6-inch sensors require matching RMR-WT-L2 and RMR-WT-L3 remover kits.

Use the current installation procedure for your exact assembly. Pipe orientation alone does not determine suitability: verify flow direction, sensor discharge direction, a fully flooded sensing cell and the required insertion depth.

Send us your installation details

Pipe size, material, pressure and water temperature
Horizontal line or riser, with actual flow direction
Valve, adapters, wall thickness and required reach
Photos with clearance for the remover and service tools
Available power, display location and communications

Request an installation review

Take the details with you.

Read Whittier’s story Installation manuals

DISCUSS YOUR APPLICATION

Review your monitoring point with Halogen.

Bring your water chemistry, installation requirements and questions about the right configuration.

Book a meeting with Travis

Keep the main live.Measure where it matters.

From risers to vaults. See it in the field.

Tank-connected risers

Below-grade vaults

Existing pipe rooms

Booster stations

Tank-wall service access

Remote equipment arrangements

At the well-site monitoring point