Gas Data GM25-2 Gas Analyser

Serviced by Flux Purchase

Configurable Portable Gas Analyser

The Gas Data GM25-2 is a versatile portable gas analyser that can be configured to suit a wide range of environmental and process gas monitoring applications.

Unlike the fixed-configuration models in the GM25 range, the GM25-2 allows the required gas channels to be selected for the application. Infrared sensors are available for methane (CH₄) and carbon dioxide (CO₂), while electrochemical sensors can be configured for oxygen (O₂), carbon monoxide (CO), hydrogen sulphide (H₂S) and hydrogen (H₂). Optional pressure measurement can also be incorporated.

This flexibility makes the GM25-2 particularly suitable where the standard landfill gas configuration is not appropriate, including biogas, wastewater treatment and odour monitoring applications.

Key Features

Configurable gas analyser
CH₄ and CO₂ infrared measurement options
O₂, CO, H₂S and H₂ electrochemical sensor options
Up to six measured gas channels
Optional LEL and N₂ calculations
Optional atmospheric, static and differential pressure measurement
ATEX, IECEx and UKEx rated
Internal data logging
DataField GM25 Connect compatibility
8–12 hour battery life
User-replaceable battery pack
12-month service interval

Application guidance: Choose the GM25-2 where you require a custom gas configuration, particularly for biogas plants, wastewater and sewage treatment, or specialist gas monitoring.

Specification	Details
ATEX Rating	ATEX, IECEx, UKEx II 2 G Ex ib IIB T1 Gb
Dimensions	260 × 100 × 75 mm
Weight	1.1 kg
Ambient Temperature Range	-10°C to +40°C
Aspiration Rating (minimum)	300 mL/min

Gas Measurements – Configurable Options

Channel	Sensor Type	Range	Resolution	Accuracy
CH₄	IR	0–100%	0.1%	±3.0% vol. (0–100%); ±0.3% vol. (0–5%)
CO₂	IR	0–100%	0.1%	±3.0% vol. (0–100%); ±1.0% vol. (25–45%)
O₂	EC	0–25%	0.1%	±0.5% vol.
H₂S	EC	0–5,000 ppm	1 ppm	±5.0% of reading or 75 ppm, whichever is greater
CO	EC	0–2,000 ppm	1 ppm	±5.0% of reading or 75 ppm, whichever is greater
H₂	EC	0–1,000 ppm	1 ppm	±5.0% of reading or 50 ppm, whichever is greater
LEL	Calculated	0–100%	0.1%	Indication only
N₂ Balance	Calculated	0–100%	0.1%	—

Optional Pressure Measurements

Measurement	Sensor Type	Range	Resolution	Accuracy
Atmospheric Pressure	Transducer	800–1,200 mbar	1 mbar	±5 mbar
Static Pressure	Transducer	±250 mbar	0.1 mbar	±2.5 mbar
Differential Pressure	Transducer	±1,250 Pa	1 Pa	±3 Pa to ±250 Pa across range