SGD 240

LEAK DETECTOR FOR UNDERGROUND NETWORKS

H2/N2 TRACER GAS (FORMING GAS) & NIDRON

The SGD 240 is a portable gas leak detector for the detection of H2/N2 tracer gas (forming gas) or Nidron. Designed for leak testing of underground or buried networks by sniffing at atmospheric pressure.

In the same range:

For leak detection with H2/N2 tracer gas (Nidron) outside underground networks, the DXH 240 offers 4 sensitivity positions and 2 detection modes.

Accessories:

For quick SGD 240 sensitivity verification, use the FT 92-T test leak (equivalent to 5 g/yr, H2/N2 version).

Leak detector for leak testing of underground or buried networks using H2/N2 tracer gas or Nidron.
Sniffer cone designed for ground-level detection.
Graphic display with bar graph for efficient leak pinpointing.

2 detection modes:

Detection mode with auto-zero.
Track mode for leak location.

4 sensitivity positions.

Detection cell:

Selective detection cell for the H2/N2 tracer gas mixture.

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Functions

4 sensitivity positions.

2 detection modes: Detection Mode and Track Mode.

Contamination-saturation indication.

LED light at the top of the housing to illuminate dark detection areas.

Replaceable and interchangeable detection cell.

Display

Graphic display with bar graph and progressive audible signal.

Cell

Electrochemical.

Detected gases

Specific tracer gas cell: H2/N2, Nidron.

Sensitivity

1×10⁻⁵ cc/s for H2/N2 tracer mixture [approx. 1 g/yr refrigerant equivalent]
5×10⁻⁷ cc/s for 100% H2 [approx. 0.05 g/yr refrigerant equivalent]
1 ppm H2 (range 1–1000 ppm H2)

Battery life

8 h

Power supply

Built-in rechargeable batteries. Charging time around 12 hours.

USB-C charging port.

Delivered with

Supplied complete in a carrying case with mains charger and user manual.

Option

n/a

Usage tips

Preparing the pipe: after the section has been isolated, H2/N2 tracer gas (Nidron) is injected at low pressure at one end. The search only starts once hydrogen is detected at the other end, which ensures that the gas has travelled the full length of the pipe.

Gas migration time: the time needed for the gas to reach the surface depends on the type of ground. It can be short in dry sandy soil, and much longer in wet clay soil or under asphalt.

Search method: the cone is placed on the ground at regular intervals, following the route of the pipe. As the gas tends to rise through joints, cracks and kerbs, these points are checked first.

Confirmation by bar hole: under a paved surface, the gas can emerge at a distance from the leak. A bar hole drilled directly above the suspect area makes it possible to measure the tracer gas as close as possible to the pipe and to confirm the leak point.

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