Can the GT Series leak detector display different units of measurement for flammable gases simultaneously?

Omni Instruments Expert Response: Yes. The GT Series features an auto-ranging display that automatically moves between PPM, LEL, and % Volume based on gas concentration. This allows a technician to use the same instrument for fine leak hunting at ppm levels and high-concentration purge monitoring at 100% Volume.

What happens to the internal sampling pump if the probe accidentally draws in liquid water?

Omni Instruments Expert Response: The instrument's sample path is protected by a high-efficiency hydrophobic water-stop filter. If the probe draws in moisture, the filter instantly blocks the liquid from entering the internal sensor chamber, while the internal pressure sensor flags a "flow fail" alert on the screen to protect the pump.

What is the purpose of the built-in "Ticker" function on the GT Series?

Omni Instruments Expert Response: The "Ticker" mode acts like a classic Geiger counter for gas leaks. When configured to the ppm flammable gas range, the device emits an audible pulsing sound that speeds up as you get closer to the leak source, allowing you to locate escapes without constantly watching the screen.

Is the pressure manometer function available on all versions of the GT Series?

Omni Instruments Expert Response: Yes. The 0 to 60 in. Water Gauge (0 to 150 mBar) electronic manometer is a standard feature built directly into the main chassis. This allows any model (from the GT-40 to the GT-43) to perform pressure drop and line tightness testing out of the box.

How do the rechargeable and alkaline battery configurations differ in everyday field use?

Omni Instruments Expert Response: The GT Series uses a flexible power compartment that accepts either standard LR14 Alkaline C-cells or a rechargeable NiMH battery pack. The alkaline cells offer quick, tool-free replacements in the field, while the rechargeable pack can be topped off via a standard plug or an optional drop-in vehicle docking cradle.

Does the ATEX hazardous area certification cover use inside confined spaces with standing methane gas?

Omni Instruments Expert Response: Yes. The instrument holds ATEX II 2G Ex iad IIB T3 and UL 913 Class I, Div 1 Groups C and D certifications. This validates the internal safety design of its circuitry, switches, and pump, allowing safe operation within Zone 1 and Zone 2 hazardous areas.

How often does the GT Series multi-gas detector require safety bump testing or full recalibration?

Omni Instruments Expert Response: For regulatory compliance and safety assurance, it is recommended to bump test the sensors before each use using a certified gas cylinder. A full laboratory recalibration should be performed every 6 to 12 months to correct for natural sensor drift and verify accuracy limits.

GT Series Multi Function Portable Leak Detector

The GT Series has been designed for the gas industry and is suitable for a wide range of different gas monitoring application. The GT range provide a robust, user friendly handheld gas detector that can be used for leak testing, confined spaces, purging or as a gas sniffer.

Hazardous Area Approved

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Description

Description

The GMI GT Series Multi-Function Portable Leak Detector is a rugged, hazardous-area-certified handheld instrument engineered specifically for the demanding requirements of gas utility distribution, pipeline maintenance, and industrial plant engineering. In contrast to the first-responder-focused GT-Fire model, the standard GT platform sacrifices ambient illumination tools to integrate heavy-duty process diagnostics, including an internal electronic water gauge manometer supporting 0–150 mBar tightness verification alongside an expanded multi-range hydrocarbon sensor path capable of scaling seamlessly from 1 ppm all the way up to 100% Volume gas. This specialised configuration provides gas engineers with a true multi-function field asset, allowing them to shift fluidly between high-sensitivity ppm leak hunting, structural confined space safety checks, infrastructure pressure drop testing, and pipeline inerting or purging operations from a single, ATEX-certified handpiece.

Applications

Gas Leak Detection/Testing
Confined Space Gas Detection
Barhole Testing
Carbon Monoxide
Purge
Sniffer
Pressure Leak Tightness

Features

Multi-application Gas Detector
PPM, LEL and Volume flammable gas ranges for leak detection.
0 – 60in. (150mBar) Water Gauge for tightness testing.
Manual/Automatic data logging.
Audible/Visual ‘Ticker’ (Geiger) indication on ppm range.
Loud audible and high visibility alarms.
Large button operation with simple display prompts.
Integral flashlight for dark meter boxes or areas.
Alkaline or Rechargeable battery options.
Charging via simple plug or docking station.
Rugged polycarbonate case, sealed to IP54 rating and suitable for outdoor use.

Specifications

Measuring Ranges	Resolution
0 – 10,000 ppm Flammable 0 -100% LEL Flammable 0 -100% Volume Gas Flammable 0 – 25% Oxygen (O2) 0 – 2000 ppm Carbon Monoxide (CO) 0 – 100 ppm Hydrogen Sulphide (H2S) 0 – 60 in. (0 to 150 mBar) Water Gauge	ppm 0 – 10,000 LEL 0 – 100% (0-9.9%) Vol Gas 0 – 100% Oxygen 0 – 25% CO – 2000ppm H2S 0 – 100ppm Water Gauge	1ppm 1% (0.1%) 1% 0.1% 1ppm 1ppm 0.1in. (1mBar)
Certification	Environment
Certification: ATEX II 2G Ex iad IIB T3 UL 913 Class I, Div 1 Groups C and D	Temperature Limits: -20 to + 50°C. (-4 to +122F.) Humidity: 0 to 98% RH (non-condensing)
Alarms	Sampling System
Highly visible flashing LED’s on display panel. Sounder in excess of 80dB(A), typically 85dB(A) @12in.	Integral pump with pressure sensor for flow fail detection. Sample path is protected by a hydrophobic filter
Physical Properties	Power Supply
Weight: (incl. Probe and Batteries): 0.78kg (1.7lbs) Dimensions: (Excl. Probe) 290 (H) x 95 (W) x 43 (D) mm. 11.4 (H) x 3.7 (W) x 1.7 (D) in.	3 x (approved LR14) Alkaline or 3 x (approved ‘C’ type) Rechargeable Batteries

All units are supplied with suitable dry cell batteries, which are suitable for all countries. If you require rechargeable batteries, please purchase the relevant approved rechargeable batteries for either ATEX or UL Certified applications. Kits with UL certification, or for use in the USA and Argentina are available on request.

Product

Ref

Price

Product Description

C67401

£1,325.00

GT-40 Multi-Function Gas Detector Kit for CH4 and CO gas detection. Methane (CH4), Range 0 to 10,000ppm & 0-100% LEL or Volume. Carbon Monoxide (CO), Range 0 to 2,000ppm. Highly visible flashing LEDs on display panel. 80dBA Sounder, typically 85 dBA @12 in. ATEX/IEC Certification: Ex ia d IIB T3. CSA Certification: Class 1, Groups CD T3. GT-40 comes supplied in Carrying Case with Solid End Probe, Tygon Tubing, Hydrophobic Filter (Pack of 2), Wrist Strap, Handbook, Quick OP Guide, Calibration Certificate & Config. Report, Rubber boot.

C67411

£1,175.00

GT-41 Multi-Function Gas Detector Kit for CH4 and O2 gas detection. Methane (CH4), Range 0 to 10,000ppm & 0-100% LEL or Volume. Oxygen (O2), Range 0 to 25%. Highly visible flashing LEDs on display panel. 80dBA Sounder, typically 85 dBA @12 in. ATEX/IEC Certification: Ex ia d IIB T3. CSA Certification: Class 1, Groups CD T3. GT-41 comes supplied in Carrying Case with Solid End Probe, Tygon Tubing, Hydrophobic Filter (Pack of 2), Wrist Strap, Handbook, Quick OP Guide, Calibration Certificate & Config. Report, Rubber boot.

C67421

£1,510.00

GT-42 Multi-Function Gas Detector Kit for CH4, CO and O2 gas detection. Methane (CH4), Range 0 to 10,000ppm & 0-100% LEL or Volume. Oxygen (O2), Range 0 to 25%, Carbon Monoxide (CO), Range 0 to 2,000ppm. Highly visible flashing LEDs on display panel. 80dBA Sounder, typically 85 dBA @12 in. ATEX/IEC Certification: Ex ia d IIB T3. CSA Certification: Class 1, Groups CD T3. GT-42 comes supplied in Carrying Case with Solid End Probe, Tygon Tubing, Hydrophobic Filter (Pack of 2), Wrist Strap, Handbook, Quick OP Guide, Calibration Certificate & Config. Report, Rubber boot.

C67431

£1,845.00

GT-43 Multi-Function Gas Detector Kit for CH4, CO, O2 and H2S gas detection. Methane (CH4), Range 0 to 10,000ppm & 0-100% LEL or Volume. Oxygen (O2), Range 0 to 25%, Carbon Monoxide (CO), Range 0 to 2,000ppm. Hydrogen Sulphide (H2S), Range 0 to 100ppm. Highly visible flashing LEDs on display panel. 80dBA Sounder, typically 85 dBA @12 in. ATEX/IEC Certification: Ex ia d IIB T3. CSA Certification: Class 1, Groups CD T3. GT-43 comes supplied in Carrying Case with Solid End Probe, Tygon Tubing, Hydrophobic Filter (Pack of 2), Wrist Strap, Handbook, Quick OP Guide, Calibration Certificate & Config. Report, Rubber boot.

C67441

£985.00

GT-44 Multi-Function Gas Detector Kit for CH4 gas detection. Methane (CH4), Range 0 to 10,000ppm & 0-100% LEL or Volume. Highly visible flashing LEDs on display panel. 80dBA Sounder, typically 85 dBA @12 in. ATEX/IEC Certification: Ex ia d IIB T3. CSA Certification: Class 1, Groups CD T3. GT-44 comes supplied in Carrying Case with Solid End Probe, Tygon Tubing, Hydrophobic Filter (Pack of 2), Wrist Strap, Handbook, Quick OP Guide, Calibration Certificate & Config. Report, Rubber boot.

67292

£6.98

Drycell Batteries for GT Series Gas Detector (Pack of 3). Supplied as standard with all GT instruments

67294

£56.00

Panasonic Rechargeable Batteries for GT Series Gas Detector, ATEX Certification (Pack of 3)

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GT Series Multi Function Portable Leak Detector

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GT Series Multi Function Portable Leak Detector

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GT Series Gas Leak Detector

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