GasCheck 3000

Manufacturer: Ion Science
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The GasCheck 3000 is a portable, battery-powered, hand-held gas leak detector. Indications of a leak are shown on the digital display and are also given by a front panel mounted LED flasher and as audible clicks from the rear panel loud speaker. The GasCheck 3000 is suitable for leak detection of all non-flammable gases other than air.

The GasCheck 3000 has a convenient storage and carrying case, together with a spare battery holder, a long flexible probe (for leak detection in areas where access is restricted) and a box-spanner for probe changing.

When the GasCheck is switched on, a small internal fan draws gas samples through the probe and into the GasCheck. It measures the thermal conductivity of the gas samples.

When you first switch on the GasCheck (or when you press the manual zero key), an auto zero is made. If further samples have a different thermal conductivity from the zeroed sample, the Gas Check calculates and displays the difference as a leak rate. This means that you can use the GasCheck to detect any gas other than that in which the Gas Check is zeroed.

Operating Temperature Range

  • GasCheck 3000: 32o to 122o F (0o to 50o C )
  • GasCheck 3000is: -4o to 140o F (-20o to +60o C )

Storage Temperature Range

  • -13o to 158° F (-25o to 70o C )

Materials of Construction

  • Storage case: Polypropylene with polyester foam insert
  • GasCheck:
    • Polyurethane casing on 3000
    • Conductive polypropylene resin with metal bracket on 3000is


  • Storage case: 16.5" x 12.5" x 3.75" (420 x 320 x 97 mm)
  • GasCheck: 15.16" x 3"  x 2" (385  x 75  x 50 mm)


  • Complete storage case: 3.5 lb. (1.6 kg)
  • GasCheck: 1.0 lb. (0.5 kg)
  • Length of short probe and nozzle: 4.3" (110 mm); length of long probe: 12" (300 mm)

Ingress Ratings

  • Minimum IP20

Detector Type

  • Dual micro-volume thermal conductivity cell

Gases Detected

  • All gases and having a different thermal conductivity to the ambient air on which it was zeroed; the larger the difference the greater the sensitivity, so that GasCheck is not highly sensitive to the gases normally found in large concentrations in the ambient air, e.g. N2 (nitrogen) and O2 (oxygen)
  • For ease of use the GasCheck groups gases having similar thermal conductivity into one of the 5 gas groups shown below (see Smallest Leak Detection Levels); each group has a calibration curve stored in memory; although the GasCheck will detect ALL gases with a different thermal conductivity to air, listed are those 12 common tracer gases that have been tested and assigned gas groups; if the gas or gas mixture that you seek is not included in these groups, select group 0 (which is the most sensitive); the Gas Check will then still find leaks quickly even though the measured values will not be displayed accurately
  • Some gases give a negative response, among them argon (Ar) carbon dioxide (CO2) and R134a.

Minimum Response Time

  • Short probe fitted less than 1 second
  • Long probe fitted about 9 seconds

Recovery Time

  • About 1 second

Maximum Detection Level

  • With the short probe and nozzle fitted 20 ml/sec
  • The nozzle when fitted provides automatic 10-fold dilution of the gas stream entering the detector cell
Gas / Gas Group
Positive/Negative  Smallest Leak Detection Level in ml/sec
H2 1.5 x 10-5  ml/sec
He 2.0 x 10-5  ml/sec
R12 5.4 x 10-5  ml/sec
R1301 4.9 x 10-5  ml/sec
R134a 2.1 x 10-4  ml/sec
R22 5.1 x 10-5  ml/sec
SF6 4.4 x 10-5  ml/sec
CO2 8.0 x 10-5  ml/sec
CH4 5.8 x 10-5 ml/sec
Ar 7.0 x 10-5 ml/sec
R11 6.3 x 10-5  ml/sec
O2 5.7 x 10-4 ml/sec

Number/Type/Size of Batteries

  • 4 alkaline AA

Recommended Batteries and Average Operating Life

  • LR6 (R6): 40 hours
  • MN1500: 40 h0urs
  • AAA Rechargeable Battery Pack: 25 hours
  • The use of the back light will dramatically shorten the battery life
  • Do not change batteries in a hazardous area

  • Quality assurance testing on manufactured component seals
  • Laboratory applications, such as the detection of leaks from gas chromatographs, from mass spectrometers, from gas cylinders and fittings
  • Industrial applications, such as the detection of leaks from gas installations, in cylinder receiving rooms, from pipeline assemblies, the detection of leaks from stored gases and the detection of vapours released from stored chemicals
  • Medical applications, such as the detection of leaks from anaesthetic gas bottles and pipelines and leak testing of membrane materials, glove boxes and so forth
  • Valve emission evaluation to EPA (Environmental Protection Agency) method 2.1
  • Leak testing of pipeline joints, gaskets, chamber windows, and so forth