On-line measurement of methane, ATEX certified

SS2100 CH4

low level CH4 measurement
rapid speed of response
high accuracy
low cost of ownership

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Tunable diode lasers monitor methane (CH4).

Consistent and reliable on-line measurements are now possible using this robust, non-contact analyser. Using lasers enables highly accurate measurements, with an extremely quick speed of response. The ability to monitor methane in near real time has led to significantly improved confidence in the measurement, and improved process efficiencies.

The speed of response of the analyser enables rapid detection and recovery from process upsets, allowing easier diagnosis of plant problems, and rapid return to normal process levels, thus allowing quick return to shipping product.

  • Non-contact with the process gas - the active measurement system is mounted behind a window, making this technique a robust measurement system with corrosive and contaminated gas streams.
  • Rapid response - near real time process control can be achieved, improving process efficiency and, in some cases, allowing the cost of process plant to be reduced.
  • Low maintenance - with no consumables or moving parts, this analyser has very low operational costs and can provide a short return on investment.




Measurement principle

Absorption spectroscopy using a tunable diode laser


Dependent on application

Analogue output

4 to 20 mA configurable


Dependent on application

Response time

Typically less than 20 seconds*

Operational temp. range

 -20 to +50 °C

LCD display

Concentration, cell pressure & temp. & diagnostics



ATEX systems are CE compliant


Ex II 2G, Ex d IIB+H2 T4,

II2D ExtD A21 IP66 T135°C


Shipping weight

Approx 86 Kg



670 H x 470 W x 377 D mm

Material (wetted parts)

316 stainless steel standard *


Aluminium epoxy coated

Pressure to cell

70 kPaG (10 PSIG)

Pressure to sample cabinet 

Between 140 to 350 kPaG (920 to 50 PSIG)

Sample flow rate

0.1 to 4 S l/min.*

Ingress protection





100 to 240 VAC, 50 to 60 Hz, 300 W



Qty 1, isolated 4 to 20 mA, 1200 Ω at 24 VDC

Relay contacts

Qty 1 general fault, Qty 1 Hi/Lo alarm

Digital 1

RS-485 half duplex & 10/100 ethernet (standard)

Digital 2

RS-232 (optional)


Modbus Gould RTU or Danial RTU or ASCII

* Application dependent

All specifications subject to change

System Integration

IMA builds bespoke integrated sample systems to provide full measurement systems.

Contact us to discuss your requirements for:

  • sample probes
  • fast loops
  • heated tube bundles
  • pressure reduction & pressure relief
  • flow control
  • filtration