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LaserGas II Single Path Compact Gas Analyzer

Product Code: NEO02121
Availability: In Stock
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Derived from the standard Single Path instrument, SP Compact Monitors are optimized for short distance measurement in the range 10 to 100 centimeters.

The Monitors feature a focused laser beam, which enables the instrument to measure through very thin nozzles (< 10 mm diameter). For applications with continuous purge to prevent dust on the analyzer lens, the SP Compact requires very small purge flow. With optional internal desiccants these monitors can also be optimized for in-situ measurement of trace levels of atmospheric gases (O2 and H2O).

The LaserGas II SP Compact Monitor consists of a transmitter/ receiver unit (mounted diametrically opposite each other) to measure the average gas concentration along the optical line-of-sight.

  • Real-time: Response time down to one second
  • No gas sampling: IN-SITU measurement
  • No cross interference from background gases
  • Stable calibration, no zero drift
  • ATEX and CSA certified
  • TÜV approved technology
C2H2 H2O NH3 + H2O
CO NO2 H2S + CO2
CO2 O2  

Optical path length typically 0.1 – 1 m (.3 – 39.3 inches)

Response time 1 – 2 sec

Averaging time Rolling average from 2 seconds to 24 hours (exp. decay)

Repeatability +/- Detection limit or +/- 1% of reading, whichever is greater

Linearity < 1%

Environmental Conditions
Operating temperature -20 °C to +55 °C (-4°F to 131°F)

Storage temperature -20 °C to +55 °C (-4°F to 131°F)

Protection classification IP66

Inputs / Outputs
Analog output (3) 4 – 20 mA current loop

Digital output

RS – 232 format, Optional 10 or 10/100 Base T Ethernet, Optional fiber optic (ASCII – format)

Relay output (3) High gas-, Maintenance-, Warning - and Fault relays (normally closed-circuit relays)

Analog input 4 – 20 mA process temperature and pressure reading

Input power supply unit 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

Installation and Operation
Flange dimension DN50/PN10 or ANSI 2"/150lbs (other dimensions on request)

Alignment tolerances Flanges parallel within 1.5°

Purging of windows Dry and oil-free pressurized air or gas, or by fan

Purge flow 10 – 50 l/min per flange (application dependent)

2 – 4 l/min per flange when set up with thin nozzles (optional)

Visual inspection Recommended every 6 – 12 months (no consumables needed)

Remote instrument check by Ethernet connection or external modem possible

Calibration Check recommended every 12 months

Validation With optional flow through cell


Laser class Class 1 according to IEC 60825-1

CE Certified, conformant with LVD 73/23/EEC, including 93/68/EEC EMC Conformant with directive 2004/108/EC

Explosion Protection (optional)

ATEX zone 2 II 3 G Ex nA nC op is Gc IIC T4, II 3 D Ex td A22 IP65 T100°C

CSA Class I, Div. 2, Groups A, B, C and D; Temp. Code T4; non-incendive

Dimension and weight

Transmitter unit 195 (plus 65 for purge unit) x 270 x 170 mm, 4.8 kg

Transmitter unit (Ex version) 195 (plus 65 for purge unit) x 270 x 310 mm, 6.5 kg

Receiver unit 208 (plus 65 for purge unit) x 125 x 125 mm, 2.6 kg

Power supply unit 180 x 85 x 70 mm, 1.6 kg

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