Gas leak detectors, analyzers, alarm devices and calibration gas
SKU# (3480)



$9,919.76     Availability: 6 Weeks
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Spectrex SafEye Quasar 900 open path IR gas detector, transmitter and receiver, for detection of hydrocarbon gases including alkanes (methane, ethane, propane, butane, pentane, hexane, heptane and octane) and ethylene. Up to 660 ft (200m) path length. Very high speed response. 0-20mA analog output with HART capability. RS485 Modbus. 316L Stainless Steel housing and tilt mounts. IP66 and IP68. FM/FMC, ATEX, IECEx, GOST R and Inmetro approvals. Includes transmitter and receiver.

Scott Label: Spyglass

Part# with Options:        QR-QT-C111
Price with Options:        9,919.76


(1) Certification for SafeEry Quasar 900
(2) Model for SafeEry Quasar 900
Entry Size
(3) Entry Size for SafeEry Quasar 900
(4) Mount for SafeEye Quasar 900 (888270 & 799225)
(5) Sunshade for SafeEye Quasar 900 (888263)

  Availability 6 Weeks  ]

The SafEye Quasar 900 Series is the very latest open path IR technology and detects a wide range of hydrocarbon gases including alkanes (methane to hexane) and ethylene.

Path lengths can be up to 660ft (200m). Quasar 900 models can be tailored to protect your high-risk installation.

Reliability and performance is key and is assured with SIL2 approval and successful 3rd party FM performance / function testing to FM and EN standards

Why Open Path Gas Detectors?

Spectrex invented the xenon flash lamp design that revolutionized the open-path gas detection market, which, until then, was plagued by false alarms due to the drawbacks of the previous designs. Now, Open path detectors complement the use of individual point detectors, take executive action and offer many significant benefits including:

  • Wider area coverage
  • Most likely method to pick up any leak
  • Very high speed of response
  • No unrevealed failure modes
  • Beam block warning
  • Detector location is less critical
  • Size of gas hazard indicated
Applications include:
  • Offshore platforms & FPSOs
  • Petrochemical plants
  • Chemical processing plants
  • Gas filling and distribution terminals
  • Gas transport and pipelines
  • Large storage areas & buildings
  • Perimeter monitoring

Quasar 900 is totally immune to interference from sunlight or any other sources of radiation such as flare stacks, arc welding or lightning.


The Quasars 900s high power xenon lamp will compensate for changing weather conditions, including rain, fog, mist, snow and makes it immune to influences from solar radiation, arc- welding, stack flares or vibration from machinery.

The optical lenses are thermostacically heated to prevent the formation of ice and build up of snow on the optics even under severe weather conditions. It also eliminates build up of condensation on the lenses.

Quasar is rated for operation over a very wide temperature range from -67F to + 149oF (-55oC to + 65oC) - a truly worldwide product


Quasar 900 is approved to SIL2 (IEC61508), equipped with heated optics and tolerates a very wide temperature range to provide reliable detection


No unrevealed failures. In normal operation, the output signal is 4 to 20 mA, depending on the measured gas concentration.

Sub-4mA signals includes indications for beam blockage (2mA), a fault (1mA). In addition, a continuous self-test of the Quasar 900 will issue a pre-warning signal (3mA) where the detector is still operational but requires some attention for example when the transmitter or receiver is misaligned or if there is a deposit build-up on the optics. Maintenance without downtime!


An internal data-logger keeps a detailed record of the previous 100 events.


The detectors are calibrated to three gases. Each detector is supplied with methane, propane and ethylene ca

No need for any manual adjustment or standard test gas, due to the built-in calibration of the Quasar 900.

Minimum Detectable Level

Due to Quasar 900's inherent stability and sensitivity, the minimum detectable level is 0.15 LEL.m


One person can easily align and commission the system without the need for special training or skills. After an initial coarse adjustment by eye, a telescope is fitted allowing fine adjustment to optimized the adjustment for maximum signal strength.

Dont just take our word for it!

We had Factory Mutual (FM) independently test Quasar 900 to recognized worldwide Function and Performance standards for open- path gas detectors (FM6325 and EN60079-29-4). Guess what we passed with flying colors!

Why do we do this?

apart from anything else, it costs a lot). Well, its to give you the assurance that what we say about Quasar 900 is true and in safety, thats important!

Installation Options

Quasar offers options for your installation:

  • 0-20mA analog output with HART capability
  • RS485 Modbus, where up to 256 detectors can be linked.
Worldwide Approvals
  • Hazardous area (Zone 1) FM/FMC, ATEX, IECEx, GOST R Inmetro
  • Performance (3 rd party): FM 6325 approved by FM
  • EN60079-29-4 tested by FM
  • Reliability: SIL2 (TUV)

I.S. approved conection port for hand held terminal in field or safe area

316L Stainless Steel housing

Heated optics

Electrical entries (x2) 3⁄4" NPT or M25


HART capabilities within the Quasar 900 can provide digital communications between the field and the safe area. This can provide real time information on the status of an individual detector as well as configuration and historical data of each device, without the need for extra cable cores.

A key feature of HART is that digital signals are transmitted on the same two wires as the 0-20mA current signal.

Useful and useable information available via HART includes:

  • Display set-up
  • Reconfigure set-up such as gas calibration, heater control, address
  • Display detector status and definition
  • Perform detector diagnostics
  • Troubleshooting
  • View Event Log
Complete Access in the Field or Safe Area

The unique, intrinsically safe approved connection port on the Quasar 900 receiver allows simple connection of various types of handheld unit that will communicate with Quasar 900 in the hazardous area. These handheld devices allow user to check alignment, zero, perform configuration changes, view event log, perform diagnostic functions, in conjunction with Spectrex software.

The handheld units are robust weather-proof devices, certified intrinsically safe for use in a hazardous, classified area.

Two options are available, both able to connect to the intrinsically safe approved connection port on the Quasar 900 receiver.

  • HART handheld
  • RS485 handheld

For work in a safe area / workshop, other options are available, still connected via the I.S. port. for your convenience.

These take the form of cable harnesses to connect with our Mini Laptop kit (p/n 777820-1) or to your own PC/laptop, using free Spectrex software

Detection Range
Model 901 902 903 904
Feet 23-66 50-132 115-330 265-660
Meters 901 902 903 904
Detected Gas C1-C8
Response Time 3 sec.
Immunity to False AlarmNot influenced by solar radiation, hydrocarbon flames and other external IR radiation sources.
Sensitivity Ranges0-5 LEL.m methane and propane
0-8 LEL.m ethylene
Spectral Response2.0 - 3.0μm
Displacement/Misalignment Tolerance0.5
Drift7.5% of the reading or 4% of the full scale (whichever is greater)
Minimum Detectable Level0.15 LEL.m
Temperature Range67F (55C) to 149F (65C)
HumidityUp to 95% non-condensing (withstands up to 100% RH for short periods)
Heated Optics To eliminate condensation and icing on the window
WarrantySafety system 3 years
Flash source bulb 10 years
Power Supply24VDC nominal (18-32 VDC)
Power Consumption (peak includes heated optics)Detector: 250mA (300mA Peak)
Source: 250mA (300mA Peak)
Warm Up Time30 sec for transmitter and receiver
Electrical Connection (specify)2 x 3/4" 14NPT conduits or 2 x M25 x 1.5mm ISO
Electrical Input Protectionper MIL-STD-1275B
Electromagnetic CompatibilityEMI/RFI protected per EN50270
0-20mA Current Output Alarm, Fault and Auxiliary
SPST volt-free contacts rated 5A at 30 VDC or 250 VAC.
0-20mA (stepped)Sink (source option) configuration - maximum load of 500 ohm at 18-32 VDC
Gas reading: 4-20mA
Obscuration/beam block: 2mA
Normal, zero reading: 4mA
Zero calibration mode: 1mA
Maintenance call: 3mA
Fault: 0mA
Misalignment: 2.5mA
RS-485 Interface Modbus CompatibleThe RS-485 input/output provides complete data information to a PC and receives control commands from the PC or handheld unit
HART HART communications on 0-20mA analog current (FSK) used for maintenance and asset management
Visual Status Indicator 3 color LED: Green Power on, Yellow Fault, Red Alarm
Hazardous Area ApprovalATEX/IECEx
Approved per
Ex d e ib [ib Gb] IIB + H2 T4 Gb
Ex tb IIIC T135C Db
The detector or source units have a combination of approvals. Each is a single enclosure (Exd) with integral, segregated rear terminal section (Exe) and intrinsically safe (Exia) data-port for external in-situ connection to Hand-Held
Diagnostic unit.
Approved per
Class I Div 1 Groups B, C and D
Class II,III Div 1 Groups E, F and G
Approved per
Ex d e ib [ib Gb] IIB+H2 T4 Gb
PerformanceApproved per FM6325 and tested by FM per EN60079-29-4
ReliabilitySIL2 per IEC61508 (TUV)
EnclosureThe source and detector housings are stainless steel 316L with electro polish finish. The circuit boards are conformal coated and protected from mechanical vibrations. The tilt mount is also stainless steel 316L.
DimensionsDetector/Source: 10.5 x 5.1 x 5.1 inch (267 x 130 x 130mm)
Tilt Mount: 4.7 x 4.7 x 5.5 inch (120 x 120 x 158mm)
WeightDetector/Source: 11lb (5kg)
Tilt Mount: 4.2lb (1.9kg)
Water and Dust TightIP66 and IP68
NEMA 250 6P
EnvironmentalMeets MIL-STD-810C for Humidity, Salt and Fog, Vibration, Mechanical Shock, High and Low Temperature
Export Info
Made inUSA
Harmonized Tariff Code (HTC)9027102000

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    888810 Emerson HART Hand-Held Diagnostics Unit c/w converter and cable harness (1m), software and manual in case. For SPECTREX SharpEye flame detectors ..

    794079-8 SPECTREX USB / RS485 Harness converter kit (non-Ex approved) to connect PC / laptop and SafEye Quasar 900. Connects via RS485 terminals in safe area. Includes software. ..

    799225 Pole mount (U-bolt) - 5" for SPECTREX SafEye Quasar 900 ..

    888140 Pole mount (U-bolt) - 2-3" for SPECTREX SafEye Quasar 900 ..

    888247-1 Commissioning Kit for Spectrex SafEye Quasar 900. Includes alignment telescope magnetic mode selector, and two function check filter plus tools, key for rear cover plus tools in carry case. Also includes USB / RS485 Harness converter kit 794079-8 (non-Ex ..

    888263 Sunshine Protector (Stainless Steel) for SPECTREX SafEye Quasar 900 ..

    888270 Tilt mount for SPECTREX SafEye Quasar 900 ..

    888815 SPECTREX HART Hand-Held Harness kit to connect between the Hand-Held and the I.S. Port on SafEye Quasar 900. Includes a harness ..

    888816 SPECTREX Cable to connect SafEye Quasar 900 detectors to Mini laptop (777820) connection port in a safe area. ..

    888816 Hand-Held Diagnostics Unit for Spectrex SafEye Quasar 900 (ATEX I.S. Approved) with converter and cable harness (1m), software and manual in case. Connects with I.S. Port. ..

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> OPEN PATH > COMBUSTIBLES :    8 Items found.

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Honeywell Sieger Searchline Excel Short/Medium/Long range system 120m to 200m complete TX and RX (Transmitter and Receiver) kit, installation hardware kit, SS316 mounting plates and brackets, 1 junction box Current Source, flex conduit and sunshade. 4-20mA. ATEX approved. Optional XNX transmitter for relay, Modbus, Fieldbus or HART outputs.



ESP SAFETY  100-0023-02

ESP Safety TGAES Open Path Gas Detector for continuos monitoring of combustible hydrocarbon gas concentrations (0-5 LEL/m) (Detects Methane and most common hydrocarbon gases including ethane, propane, butane and propylene). Transmitter and receiver modules. Includes 4-20mA, HART and RS-485 Modbus RTU serial communication outputs. 316 stainless steel enclosures. Tri-color status LED. FM, CSA, CE and IECEx Approved. SIL2 Rated.