Skip to Main Content
  • Instrumart
Instrumart logo
  • Products
  • Brands
  • Applications
  • Lab
  • Blog
  • Account
  • Email Us
  • 1-800-884-4967
  • What can we help you find?

    Can’t find what you’re looking for? Contact one of our engineers today. We’re open Mo-Th 8am to 5:30pm. Fr 8am to 5pm ET.
    • 1-800-884-4967
    • Email Us
    • Live Chat

Instrumart will be closing at 3:00PM EST on Friday, May 23rd and will be closed on Monday, May 26th in observance of Memorial Day.

  1. Leak Detectors

Flowline LH29 Interstitial Leak Detection Switch

Valox sensor body with PP float and Halar jacketed cable for corrosive liquids, Flat/low profile sensor with minimal float.

Flowline LH29 Interstitial Leak Detection Switch
Flowline LH29 Interstitial Leak Detection Switch
$290.00

View Company Reviewsby Trustpilot
Part Number
  • LH29-1001
Manufactured
  • By Flowline
Includes
  • FREE Ground Shipping on orders of $1,000 or more
  • FREE Lifetime Tech Support
Availability
  • Usually ships in 1-2 weeks
Product Manual Product Specs
Questions?
Call 1-800-884-4967 or email sales@instrumart.com. Open Mo-Th 8am to 5:30pm. Fr 8am to 5pm ET.
Trustpilot

Overview

Features

  • Contact type: (1) SPST reed
  • Pressure: 50 psi (3.44 bar)
  • Contact output: NC (opens on rise)
  • Process temp.: -40 to 221°F (-40 to 105°C)
  • Contact state: NC, Open on rise
  • Float material: Foamed polypropylene
  • Body material: Valox 420
  • Applications with limited space and corrosive liquids
  • Pivot pin: Stainless steel
  • Wire type: 2 conductor, #22 AWG
  • Wire length: 10’ (3.04m)
  • Wire jacket material: Halar jacketed
  • Contact rating: 30 watts
    • 240 VAC (0.14 amps resistive)
    • 120 VAC (0.28 amps resistive)
    • 120 VDC (0.07 amps resistive)
    • 24 VDC (0.28 amps resistive)

Description

The Flowline LH29 Interstitial Leak Detection Switch provides reliable leak detection in and around secondary containment sumps and tanks with a 1A relay output. The flat body Valox leak sensor is ideal for placement in hard to reach interstitial areas with limited space. In the event of a leak, the foam polypropylene float will rise to signal the presence of unwanted liquid in the containment vessel. The leak detection switch is typically mounted flat on the bottom of the sump floor or secondary containment tank wall.

Additional features / benefits for the Flowline LH29 Interstitial Leak Detection Switch include:

  • Valox sensor body with PP float and Halar® jacketed cable for corrosive liquids
  • Flat, low profile sensor with minimal float rise for applications with limited space
  • Dry contact, normally closed reed switch opens to signal the presence of liquid
  • Easy to install
  • Ideal for double wall tanks or pipes
  • Used to signal the presence of liquid leaks or overflow in any containment area

Documents

Spec Sheets

  • Flowline LH29 Interstitial Leak Detection Switch Datasheet PDF (433 KB)

Manuals

  • Flowline LH29 Interstitial Leak Detection Switch Manual PDF (448 KB)

Accessories

Flowline Single Controller NEMA Box
Flowline Single Controller NEMA Box

Single Controller, Windowed, 35mm Rail, Polycarbonate.

$520.00
Flowline LC4 / LC9 Series Switch Pro Remote Level Controller
Flowline LC4 / LC9 Series Switch Pro Remote Level Controller

Three configurations for pump and valve control, fail-safe relay control of pumps or valves with 0-60 second delay.

Starting at $285.00

Need Help? Call a Flow engineer at 1-800-884-4967

We're open Mo-Th 8am to 5:30pm. Fr 8am to 5pm ET

Lou P. headshot Lou P.
Senior Applications Engineer
28 years at Instrumart
Martin K. headshot Martin K.
Applications Engineer
Mathias H. headshot Mathias H.
Senior Applications Engineer
15 years at Instrumart
Patrick M. headshot Patrick M.
Applications Engineer
3 years at Instrumart
Jason D. headshot Jason D.
Senior Applications Engineer
22 years at Instrumart
Dan R. headshot Dan R.
Applications Engineer
3 years at Instrumart
MaryKate R. headshot MaryKate R.
Applications Engineer
3 years at Instrumart
Lou P. headshot Lou P.
Senior Applications Engineer
28 years at Instrumart
Martin K. headshot Martin K.
Applications Engineer
Mathias H. headshot Mathias H.
Senior Applications Engineer
15 years at Instrumart
Patrick M. headshot Patrick M.
Applications Engineer
3 years at Instrumart
Jason D. headshot Jason D.
Senior Applications Engineer
22 years at Instrumart
Dan R. headshot Dan R.
Applications Engineer
3 years at Instrumart
MaryKate R. headshot MaryKate R.
Applications Engineer
3 years at Instrumart
Lou P. headshot Lou P.
Senior Applications Engineer
28 years at Instrumart

Recently Viewed

Flowline LH29 Interstitial Leak Detection Switch
Flowline LH29 Interstitial Leak Detection Switch
United States Canada Mexico
Shop
Products
Brands
Applications
Support
Customer Service
Ask a Question
Live Chat
Track Order
Fraud Prevention
Financing
Our Company
Blog
About Us
Contact Us
Jobs
Travel Information
Our Team
Privacy Policy
Terms and Conditions of Sale
Accessibility Statement
Connect
1-800-884-4967
sales@instrumart.com
Instrumart
35 Green Mountain Dr
S Burlington, VT 05403 US
Mo-Th 8:00am to 5:30pm ET
Fr 8:00am to 5:00pm ET
Join Us on Facebook
Follow Us on X

Instrumart is a member of a family of industrial stores

Instrumart Compressor World Pump World BioPharm World Filtration World Motion World Qualitrol Engineered Solutions Wholesale Air Pipe
© Instrumart 2025

Family of Industrial Stores

Welcome to our family of stores, your go-to source for a wide selection of commercial and industrial products in the flow control and automation sectors. Each store features a curated range of specialized industrial solutions, with many items designed to complement each other, ensuring you can find everything you need for your specific application. Explore the stores below to discover our extensive product offerings for your business needs.

  • Instrumart

    Shop Industrial and Laboratory Instruments.

    Shop Now!
  • Compressor World

    Shop Compressed Air Equipment.

    Shop Now!
  • Pump World

    Shop Industrial, Water, and Waste Water Pumps.

    Shop Now!
  • BioPharm World

    Shop Sanitary Process Solutions and Products.

    Shop Now!
  • Filtration World

    Shop Industrial Filters.

    Shop Now!
  • Motion World

    Shop Motion Control and Process Automation Systems.

    Shop Now!
  • Qualitrol

    Shop Remanufactured or Repair Automation Products.

    Shop Now!
  • Engineered Solutions

    Shop Custom Engineered and Manufactured Systems.

    Shop Now!
  • Wholesale Air Pipe

    Shop Air Piping.

    Shop Now!