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The 720b Combustible Gas Leak Detector offers 10ppm sensitivity to detect combustible gasses.

720B Combustible Gas Leak Detector

Easily operated with one hand, leaks are pinpointed using the audio and visual indicators. An adjustable “tic” rate helps eliminate background gas concentration in contaminated environments.

  • Instant response
  • 10 ppm (methane) sensitivity
  • Adjustable tic rate
  • One-hand operation
  • Visual and audible leak indication
  • 16” gooseneck
  • Measurement capability
  • Soft carrying pouch

$149.95 USA Suggested List Price

Digi-Key Electronics
Global Test Supply

The 720b is an advanced state-of-the-art leak detector capable of detecting many combustible, noncombustible and toxic gases.

The following is a partial list of gases that the 720b is sensitive to:
Acetone, Alcohol, Ammonia, Steam, Carbon Monoxide*, Butane, Gasoline, Jet Fuel, Hydrogen Sulfide, Smoke, Industrial Solvents, Methane, Lacquer Thinner, Naphtha, Propane, Natural Gas.

*Not to be used to quantify the amount of CO present.

Standard accessories:
• Sensor (A739)
• Instruction Manual: 720b Instruction Manual
• Soft Pouch (A700)

Optional accessories:
• Hard Case (A714)
• Earphone (A710)

 Model 720b Specifications
 Combustible Gasses Detected
 (Partial List)
 Methane, Natural Gas, Gasoline, Diesel, Propane (LPG),
 Butane, Kerosene
 Sensitivity  10ppm (methane)
 Sensor Type  Low power semiconductor
 Probe Length  16”
 Leak Indication  Audio / Visual
 Adjustable Tic Rate  Yes
 Alarm  No
 Carbon Monoxide Measurement  No
 %LEL Indication  No
 Internal Sample Pump  No
 Intrinsic Safety Rated  No
 Battery  “C” cell (2)
 Weight  1.1 lb

Model 720b Applications

  • Detect combustible gasses including natural gas methane, propane (LPG), gasoline, diesel, and kerosene
  • Trace natural gas lines and fittings for leaks
  • Check gas generation for leaks

Frequently Asked Questions

1. What is the difference between the HXG-2 and the 720b?
The HXG-2 is intrinsically safe and has an adjustable alarm.

2. Can I use the 720b or HXG-2 to test for carbon monoxide as well as combustible gas leaks?
The HXG-2 and 720b are designed to detect combustible gas leaks. The 735 or 775 are the best choices to test for carbon monoxide as well as combustible gas leaks.

3. What is the difference between the 735 and 775?
Both the 775 and 735 can be used to test for carbon monoxide in ambient air as well as test for combustible gas leaks. The 735 is pump driven and can be used to test for CO infurnaces as well. When testing for combustible leaks the 775 uses an audible “tic” and visual indication while the 735 has audible indicationand displays the leak level in %LEL.

4. I only need to test for combustible gas leaks, which detector should I choose?
The 725 is pocket sized with LED and audible indicators that activate at preset leak levels. The 725 can detect a leak but does nothave the capability to determine the source. The 720b and HXG-2 are more sensitive, utilize a thumb wheel adjustable “tic” rate, and have goosenecks that enable them to reach into tight areas and not only detect a leak but determine the source. The HXG-2 has an adjustable alarm and is intrinsically safe.

5. I need to be able to produce a “hardcopy” of test results. Do any of the TPI detectors have this capability?
Yes, the 735 has an infrared interface for printing testing results.

6. What gases can be detected?
Gases that can be detected include but are not limited to Acetone, Alcohol, Butane, Gasoline,Kerosene, Methane, Natural Gas, and Propane.

TPI Model 720b Demonstration Video

Product Documentationpdf-icon1

Click below to view or download product documentation PDFs:

720b Manual

720b Data Sheet

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