Analyzer LaserGas™ II Open Path


NEO Monitors LaserGas™ II OP is a compact, high performance gas monitor for ambient long distance monitoring. The LaserGasTM II OP consists of a transceiver and retro-reflector unit. The retro-reflector unit consists of one or several cube corners in a weather proof enclosure. LaserGasTM II OP is known as “single line spectroscopy”. A single gas absorption line with no interference is chosen in the near IR spectral range and scanned by a single-mode diode laser. A retro-reflector located opposite to the laser reflects the light back to the transceiver.  A detector collects the returned light for further analysis and calculation of the gas concentration.

Technical data

Path length: Typically 10 – 500 m
Response time: 1-2 sec

Environmental conditions
Operating temperature: -20 ºC to +55 ºC
Storage temperature: -20 ºC to +55 ºC
Protection classification: Transceiver unit IP66 (retro-reflector and battery unit IP65)

Inputs / Outputs
Analog output (3): 4 – 20 mA current loop (concentration, transmission)
Digital output: TCP/IP, MODBUS

Optional fibre optic
Relay output (3): High gas-, Maintenance- Warning – and Fault (normally closed)

Input power supply: 100 – 240 VAC, 50/60 Hz, 0.36 – 0.26 A
Output power supply unit: 24 VDC, 900 – 1000 mA
Input transmitter unit: 18 – 36 VDC, max. 20 W
4 – 20 mA output: 500 Ohm max. isolated
Relay output: 1 A at 30 V DC/AC

Battery supply unit (optional):
Input: 90-264 VAC, 50/60 Hz, Output: 24 VDC, fused 1A

Installation and Operation
Installation: Special X/Y alignment platform, tripod or auto alignment unit.
Purging of windows: By fan or blower (only recommended for certain applications)

Interval: Recommended every 6 – 12 months
Calibration: Check recommended every 12 months

Laser class: Class 1 according to IEC 60825-1
CE: Certified
EMC: Conformant with directive 2014/30/ EU

Explosion protection (optional)
ATEX zone 1: II 2 G Ex px II T5; II 2 D Ex pD 21 IP66; T64 ºC
IECEx/ATEX zone 2: II3 G Ex nA nC [op is]; IIC T4 Gb; II 3 D Ex tD A22; T100 ºC
CSA: Class I, Div. 2, Groups A, B, C and D; Temp. Code; T4; non-incendive

Dimension and weight
Transceiver unit: 500x70x180 mm, 6.5 kg
Transceiver unit (Eex P): 500x270x320 mm, 8.2kg
Retro reflector unit: Size depends on number of reflectors (1 – 25 reflectors)
Power supply unit: 180x85x70 mm,1.6 kg
Battery supply (optional): Size depends on version (10 h / 24 h) max. 280 x 190 x 180 mm, 13.8 kg

Additional information


NEO Monitors


Cement plants, Chemical and petrochemical industry, Coke plants and steelworks, Gas industry, Heavy industry, Power and heat, Pulp and paper plants, The arms industry, Water and sewage

Measured parameters

Ammonia (NH3), Carbon dioxide (CO2), Carbon monoxide (CO), Hydrogen fluoride (HF), Hydrogen sulfide (H2S), Methane (CH4), Methane (CH4) (0-100% LEL)


Gas detection