Analyzer LaserGas™ II MultiPass


NEO Monitors LaserGas™ is using Tuneable Laser Absorption Spectroscopy (TLAS) i.e. a non-contact optical measurement method employing solid-state laser sources. Therefore, the sensor remains unaffected by contaminants and corrosives and does not require regular maintenance. The laser beam is coupled into a Herriott cell, where it is reflected multiple times between two spherical mirrors in order to enhance the analyser sensitivity. The MP monitor is a turn-key instrument. No other operations than connecting power, sample gas tubes and optional purge are required during installation. To avoid fouling of optical parts in the Multipass cell the cleanliness of the sample gas must be ensured. Filtering the sample gas in an appropriate extractive system may be required for some applications.

Technical data

Technical data of analyzer LaserGas II MultiPass

Optical path length: 2. 7 and 11.4 m
Response time: Typically 2 – 10 sec (depending on cell and sample gas flow)
Accuracy: Application depended
Repeatability: 1% of range (gas & application spesific)

Environmental conditions
Operating temperature: -20 °C to +55 °C
Storage temperature: -20 °C to +55 °C
Protection classification: 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 relays
Analog input: 4 – 20 mA process temperature and pressure reading

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

Installation and Operation
Gas inlet / outlet: 6 mm or 1/4 “ / 8 mm; (5/16’’) Swagelok (other dimensions on request)
Sample gas flow: Recommended 1 – 5 l/min
Sample inlet pressure: 1 – 1.5 Bar abs (14.5 –21.7 psia)
Sampling gas temperature: 0-180 °C
Purging of laser chamber (optional): Dry and oil free pressurised air and gas, Nitrogen for O2 and CO2
Purge flow: Maximum 0.5 l/min

Visual inspection: Recommended every 6 – 12 months (no consumables needed)
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)
IECEx/ATEX zone 2: II 3 G Ex nA nC op is; IIC T4 Gb; II 3 D Ex td A22 T100°C
CSA: Class I, Div 2 Groups; A, B, C and D; Temp.; Code T4; non-incendive

Dimension and weight
Cabinet: 500 x 510 x 215mm; 18.4 kg


Additional information


NEO Monitors


Cement plants, Chemical and petrochemical industry, Coke plants and steelworks, Food industry, Gas industry, Heavy industry, Laboratories and research institutes, Pharmaceutical and cosmetics industry, Power and heat, Printing houses, Production of technical gases, Pulp and paper plants, Semiconductor industry, Sugar-factory, The arms industry, Waste incineration plants, Water and sewage

Measured parameters

Ammonia (NH3), Carbon monoxide (CO), Hydrogen chloride (HCl), Hydrogen cyanide (HCN), Hydrogen sulfide (H2S), Methane (CH4)