NEO Monitors AS

- Model II SP Compact - Standard Single Path Compact Monitor


NEO Monitors LaserGas is using Tuneable Laser Absorption Spectroscopy (TLAS) i.e a non-contact optical measurement method employing solid-state laser sources. The sensor remains unaffected by contaminants and corrosives and does not require regular maintenance. The absence of extractive conditioning systems further improves availability of the measurements and eliminates errors related to sample handling. The monitor is mounted directly onto flanges, which include purge gas connections and a tilting mechanism for easy alignment. Continuous purge flow prevents dust and other contamination from settling on the optical windows. Once power and data lines are connected, measurements are performed in real-time.

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 analyser 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.

  • Response time down to 1 second
  • No gas sampling: In-situ measurement
  • No interference from background gases
  • No moving parts, no consumables
  • ATEX and CSA certified
  • Can measure through very thin nozzles
  • <10 mm diameter
  • Optimised for very short distance measurements
  • across pipes and along short cells
  • Compact design
  • No zero drift
  • Stable calibration

LaserGas II SP is designed for reliable and fast measurement of all kinds of gases in any environment, most typically:

  • Chemical industry
  • Petrochemical industry
  • Metal industry
  • Power plants
  • Waste incinerators
  • Cement industry
  • Automotive industry
  • Scrubber technology
  • Glass industry
  • PVC production
  • Pulp and paper
  • and more

  • In-situ monitoring
  • Highly reliable real time analyzer
  • Limited need for maintenance
  • Low maintenance cost
  • Reduce emission to the environment
  • Easy to install and operate
  • Reduce daily operation costs
  • Optimize process
  • Well proven measurement technique
  • Requires low purge flow

  • Optical path length: Typically 0.1-1m
  • Response time: 1 – 2 sec
  • Accuracy: Application dependet
  • Repeatability: 1% of range (gas and application spesific)

Environmental conditions

  • Operating temperature: -20 º C to +55 º C
  • Storage temperature: -20 º C to +55 º C
  • Protection classification: IP66

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 (normally closed-circuit relays)
  • 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 alignment: DN50/PN10 or ANSI 2’’/150lbs (other dimensions on request)
  • Alignment tolerances: Flanges parallel within 1.5º
  • Purge flow:
    • Dry and oil-free pressurised air or gas or by fan
    • 10-50 l/min per flange (application dependent)
    • 2-4 l/min per flange when set up with thin nozzles (optinal)


  • Visual inspection: Recommended every
    • 6 – 12 months (no consumables needed)
  • Calibration: Recommended every 12 months
  • Validation: With optional flow through cell


  • 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

  • Transmitter unit: 195 (plus 65 for purge unit) x270x170 mm, 4.8 kg
  • Transmitter unit: 195 (plus 65 for purge (EX ver.) unit) x 270x310 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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