Portable Explosive Meters

Vasthi (Model VS-70 E) HANDHELD PORTABLE COMBUSTIBLE GAS DETECTOR is a compact battery operated portable instrument used for taking an air sample and indicating the presence of and concentration of combustible gas. Samples of the air under test are drawn by means or a rubber aspirator bulb and analyzed for combustible gas content on a heated platinum filament in a Wheatstone bridge measuring circuit.

A built-in meter indicates combustible gas content in units of explosibility. Power for operation or the instrument is provided by Lithium-ion batteries. A probe and extension hose permit withdrawal of samples from remote locations and the instrument fits in a compact leather case with over the shoulder carrying strap.
Portable Explosive Meter2


The model VS-70 E is suitable and recommended for testing tanks, manholes, vessels, pressure cylinders, pipelines, and other closed systems or confined spaces to determine presence or absence of combustible gas, It is a valuable aid for the safety of operations whenever combustible gases or vapors are handled.


  • This Model is battery operated.
  • Transmit warnings via series of audible and visible signals such as alarms and flashing lights, when dangerous levels of gas vapors are detected.
  • Model: VS – 70 E

Technical Specifications

Sampling Method Diffusion or Auto Suction
Sensors Life 5 years for Catalytic
Measurement 0-100% LEL Continuous
Readout Graphical Digital
Resolution 0.1
Accuracy +/- 1%
Repeatability +/- 1%
Response Time < 10 seconds at 95% variation
Alarms Low and Hi Visual and Audible (Different Tones)
Low Battery Alarms Audio & Visual
Power Supply Standard Batteries
Battery Backup Continuous 8 hours
Temperature Range 0-55 Deg. C
Warranty 1 Year
Display 128 x 64 Pixels Graphical LCD
Power Single cell lithium ion battery with in-built charge control
Weight 445 grams (approx)
Dimensions Refer to GA Drawing
Degree Of Protection IP – 65