Quasar 900
Open Path Gas Detector
Rev. A, Jan 2013
Outline
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Applications
General Features
Model Range
Principles of Operations
Technical Specifications
Operation Mode
Output Signals
Accessories
Installation Instructions
Terminal Wiring
Wiring Configuration
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Applications
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FPSO ‐ Oil & Gas rigs production Petrochemical plants
Gas filling and distribution terminals
Production and storage area monitoring
Perimeter (Fence‐line) monitoring
Pipeline monitoring
Process monitoring
Industrial fugitive emissions
Floating roof storage tank protection
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General Features
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Long Range Flammable Gas Detection >200m
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High Sensitivity and high resolution
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FM and European Performance approved & tested
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Stability of the gas reading
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Fast response <3sec ‰
Operating temperatures ‐55°C to +65°C
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Continuous operation in extreme environmental conditions ‰
Built in event recorder – real time record of the last 100 events ‰
Compact design
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Models
The Quasar 900 Series includes 4 models with the ability to detect over distances of 7 – 200m.
Model No.
Min / max Installation distance
(feet)
(meters)
901
23 ‐ 66
7 ‐ 20
902
50 ‐ 132
15 ‐ 40
903
115 ‐ 330
35 ‐ 100
904
265 ‐ 660
80 ‐ 200
‐ The Source for models 901, 902 and 903 is the same electronically and optically. The only difference is in the apparatus diameter that enables different source intensities.
‐ The Source for model 904 has different optics with different Xenon lamp source.
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P/N Definition of Quasar 900
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Gas Calibration
The Quasar 900 is sensitive to a wide range of hydrocarbon gases.
The detector has two standard gas calibrations:
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Methane 100%
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Propane 100%
The response of the detector to a variety of hydrocarbon gases is relatively uniform. There is a small difference in sensitivity to different hydrocarbons and mixtures. We would select either of the above standard calibrations depending on the gases likely to be present.
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Detector /Receiver Unit
The Detector receives the transmitted pulsed radiation signals from the Flash Source. The signals are then amplified and fed into an analog to digital signal converter to be processed by the internal microprocessor.
One 3‐color LED indicator
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Flash Source / Transmitter Unit
The Flash Source unit emits IR radiation pulses at the rate of two pulses per second. The pulses are very short (few micro‐seconds long) and powerful. The front of the SafEye source has a lens that collimates the IR beam for maximum intensity. The front window is heated to improve performance in icing, condensation and snow conditions.
One 3-color LED indicator
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Principle of Operation
The Quasar system detects hydrocarbon gases through dual spectral range monitoring, analyzing the absorption of radiation caused by gases in the atmosphere and comparing it to background atmospheric absorption.
Detector
Source
Outputs
DSP
GAS
Pre-amp
Current Driver
Pre-amp
Flash Lamp
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Principle of Operation
During normal operation, the reference and signal have the same intensity. The ratio is 1 which means no gas reading. During fog, dust, smoke etc., the signals and the reference are reduced. The ratio is 1 which means no gas reading. When gas is present, the signal is lower than the reference. The ratio is less than 1, which leads to gas reading. During misalignment, the reference goes down and the signals are less affected.
The ratio is more than 1 which leads to a misalignment fault condition.
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LEL Meter Concept
1 LEL meter (1 LEL.m) = a cloud of 5% methane (100% LEL) gas that is 1 meter wide.
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LEL Meter Concept
1 LEL meter = a cloud of 0.25% methane (5% LEL) gas that is 20 meters wide
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Technical specifications
General
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Response Time
< 3 sec.
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Gas Calibration 100% Methane or 100% Propane
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Immunity to False Alarm
Not influenced by solar radiation, hydrocarbon flames ‰
Spectral Response
2 ‐ 2.5µm
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Sensitivity Range
0‐5 LEL.m
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Displacement/Misalignment
Tolerance
± 0.5°
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Drift
Long term ± 5% of full scale
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Minimum Detected Level 0.15 LEL.m.
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Operating Temperature Range ‐67°F (‐55°C) to +149°F (+65°C)
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Heated Optics
To eliminate condensation and icing on the window
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Warranty SafEye system – 3 years
Flash source bulb – 10 years
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Electrical Specifications
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Power Supply
24VDC nominal (18‐32 VDC)
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Power Consumption
Detector: 200mA (250mA*)
(*including heated optics) Source: 200mA (250mA*)
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Warm up Time
30 sec for transmitter and receiver
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Electrical Connection 2 x 3/4" ‐ 14NPT conduits
or 2 x M25 x 1.5mm ISO
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Electrical Input Protection
According to EN/IEC 50270
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Electromagnetic Compatibility
EMI/RFI protected per EN/IEC 50270
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Hazardous Area Approvals
ATEX / IECEx (pending)
Ex II 2G D Ex d e [ia] ia IIB+H2 T4 Gb ‐55°C to +65°C;
Ex tb IIIC T135° Db IP66 The detector and source units each have a combination of approvals. Each is a single enclosure (EExd) with integral, segregated rear terminal section (EExe) and intrinsically safe (EExia) data‐port for external in‐situ connection to a Hand‐Held Diagnostic unit.
Factory Mutual
Approved for FM USA & FM Canada
Per Explosion proof with I.S. outputs for use in Class I Div 1 Groups B, C and D, Class II,III Div 1 Groups E, F and G. T6 ‐58°F (‐50°C) ≤Ta≤+149°F (+65°C).
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Other Approvals
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Performance
per FM3625 (FM approved)
per EN60079‐29‐4 (FM tested)
‰ Reliability
SIL2 approved per IEC61508 (pending TUV)
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Outputs – Interfaces
0‐20mA Current Analog Output Sink (source option) configuration.
RS‐485 Interface – Modbus
The RS‐485 Modbus compatible output that provides data communication from a network. This feature enables easy maintenance, local and remote diagnostic tools.
HART A bi‐directional industrial field communication protocol used for receiving detector’s status, detector’s setup and for troubleshooting. Visual Status Indicator
3 color LED: Green – Power ‘on’
Yellow – Fault
Red – Alarm
I.S. approved connection port on side of detector
Allows connection of appropriate handheld devices in Ex area or convenient connection in safe area
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Mechanical Specifications
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Enclosures
‐ The source and detector housings are 316L stainless steel with electro‐polish finish. ‐ The circuit boards are conformal coated and protected from mechanical vibrations. ‐ The Tilt Mount is also 316L stainless steel.
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Mechanical Specifications
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Dimensions
Detector/Source:
10.5" x 5.1" x 5.1" (267 x 130 x 130mm)
Tilt Mount:
4.7" x 4.7" x 5.5" (120 x 120 x 158mm)
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Weight Detector/Source: 11.0lb (5.0kg)
Tilt Mount: 4.2lb (1.9kg)
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Water and Dust Tight
IP66 and IP68
NEMA 250 6P
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Environmental Meets MIL‐STD‐810C for Humidity, Salt and Fog, Vibration, Mechanical Shock, High and Low Temp.
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Operation Modes
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Normal
Normal operation mode measures the gas concentration and can enter to Warning or Alarm, depending on the gas reading.
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Maintenance Call (3mA)
Operates like ‘Normal’ operation but gives a pre‐warning to allow preventative maintenance when detector parameters are becoming close to a Fault condition. ‰
Fault Mode ‐ In the Fault status, there are three fault types
Fault 1 (2mA) – Non critical (e.g., obscuration of the signal)
Fault 2 (2.5mA) – Detector Misalignment. Fault 3 (1mA) – Critical (e.g., Low Voltage Fault)
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Zero Calibration Mode (1mA)
This mode zeros the background level from which the Detector will read gas. 21
Visual Indicators ‐ Detector
One 3‐color LED indicator is located on the rear of the detector/source and can be seen through the rear cover window.
Detector Status
LED Color
LED Mode
Fault
Yellow
4Hz – flashing
Alignment/Standby
Yellow
1Hz – flashing
Zero Calibration
Yellow
Constant
Normal
Green
1Hz – flashing
Warning
Red
2Hz – flashing
Alarm
Red
Steady 22
Visual Indicators – Source
Source Status
LED Color
LED Mode
Fault
Yellow
4Hz – flashing
Normal
Green
1Hz – flashing
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Output Signals
The system provides the following outputs: ‰
Standard 0‐20 mA analogue ‰
HART
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ModBus (RS‐485)
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0‐20 mA Output
providing a continuous reading of the actual gas concentration Current Reading
Status And Description
1mA +0.3mA
Critical Fault
1mA ±0.3mA Zero Calibration (In Progress)
2mA
Non‐Critical – obscuration in path ±0.3mA 2.5mA ± 0.3mA Misalignment fault 3mA ±0.3mA “Maintenance Call” – early warning
4mA
No gas present ±0.5mA 4‐20mA Continuous measure of gas concentration ‐ 0 to full scale
21mA
Concentration over the range limit (over full‐scale).
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HART Interface
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HART Protocol is a digital communication signal at low level on top of the 0‐
20mA signal.
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This is a bi‐directional field communications protocol used to communicate between intelligent field instruments and the Host System.
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Through the HART Protocol the detector can:
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Display set‐up
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Reconfigure set‐up
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Display detector status and definition
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Perform detector diagnostic
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Troubleshooting
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View Event Log
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HART Interface
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Spectrex SafEye 900 Gas Detector is also fully compatible with HART protocol and certified by HART.
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SafEye uses the more advanced HART protocol, HART 7.0. ‰
SafEye Device Description allows user to fully maintain the device and has the same functions as the RS‐485 WinHost software.
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ModBus Interface
The ModBus (RS‐485) communication sends complete data information to a PC and receives data or control commands from the PC. The communication with the PC that is operated through the interface is executed only when used with appropriate Spectrex host software.
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Accessories
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Commissioning Kit P/N 888247
The Commissioning/Alignment Kit is required for commissioning and maintenance checks. Only one kit is required per site.
The kit includes:
‰ 1 pc ‐ Alignment Telescope P/N 888210
‰ 1 pc ‐ Magnetic Mode Selector P/N 790285
‰ 2 pc ‐ Function Check Filter P/N 888260‐1 and 888260‐2
‰ 1 set ‐ Socket keys for access to units
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Tilt Mount P/N 888270
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Pole Mount (U‐Bolt 5 inch) P/N 799225
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Communication, Diagnostics, Set‐up
Commissioning, maintenance and diagnostics tools for the Quasar 900 Series, which provide verification, status and instructions for changing detector parameters. Includes cable harness with RS485 / USB converter
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Hand‐Held Diagnostic Kit P/N 799810
‐ Certified I.S. (EExia) for use in the hazardous area. ‐ Connects to I.S. port on 900.
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HART Hand‐Held Diagnostic Unit P/N 888810.
‐ Certified I.S. (EExia) for use in the hazardous area. ‐ Connects to I.S. port on 900.
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Mini Laptop Kit P/N 777820‐1 , preloaded with Spectrex software.
‐ For use in Safe area only. ‐ Connects, for convenience, to the port on 900 or RS 485 terminals 30
Communication, Diagnostics, Set‐up
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If, instead, user wishes to use their own PC/laptop in safe area, we offer:
USB RS485 Harness Converter Kit P/N 794079‐8
This kit with RS485/USB converter, is used with Spectrex Host software, enables the user to connect to any available PC or laptop to re‐configure settings or perform diagnostics on Quasar 900 series.
‐ For use in Safe area only. ‐ Connects, for convenience, to port on 900 or RS 485 terminals 31
Installation Instructions
Guidance
Guidance tips for gas detector locations in order to provide the best detection coverage:
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Prevailing wind/ventilation and leak pressure will have a significant effect on where leaking gas will go and accumulate
Below potential leak source for heavier than air gases.
Above potential leak sources for lighter than air gases
Near to leak sources along the expected leak trajectory, taking into account prevailing wind directions
Between leak source and potential ignition sources
In area with expected heavy fog, rain or snow, consider the effect of long range installation and install the Detector at shorter range with the maximum intensity model available.
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Guidance
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The appropriate detector should be selected for the length of open path to be monitored. ‰
To allow for ageing of the Source and a reduction of the IR signal due to adverse weather, we recommend using a Detector that is not near the limit of its operating range.
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The open path between the Source and Detector and the immediate surroundings should be kept clear of obscuration that might hinder the free movement of air in the protected area or block the infrared beam. 33
Detector & Tilt Mount Assembly Model No.
901
902
903
904
Detector
(Receiver)
QR‐X11X
QR‐X11X
QR‐X11X
QR‐X11X
Source
(Transmitter)
QT‐X11X
QT‐X21X
QT‐X31X
QT‐X41X
Min. Installation Distance
Max. Installation Distance
23ft (7m)
50ft (15m)
115ft (35m)
265ft (80m)
66ft (20m)
132ft (40m)
330ft (100m)
660ft (200m)
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Detector Alignment
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The Telescope includes a Periscope that consists of a prism and an ocular located vertical to the Telescope assembly.
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Prior To Telescope Installation, the Telescope and its sight Mounting
need to be free from any dirt, to ensure proper alignment according to
factory calibration 35
Detector & Tilt Mount Assembly
Description
1
Tilt Mount Holding Plate
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Detector Tightening Screw
2
Detector/Source Holding Plate
10
Detector Tightening Washer
3
Horizontal Crude Alignment Tightening Screw
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Detector
4
Horizontal Fine Alignment Tightening Screw
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Telescope
5
Vertical Fine Alignment Tightening Screw
13
Telescope Tightening Bolt
6
Vertical Crude Alignment Tightening Screw
14
Detector Back Cover
7
Vertical Find Alignment Screw
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Detector Back Cover Secure Bolt
8
Horizontal Fine Alignment Screw
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Tilt Mount Assembly Description
1
Tilt Mount Holding Plate
5
2
Detector/Source Holding Plate
6
3
Horizontal Crude Alignment
Tightening Screw
Horizontal Fine Alignment
Tightening Screw
7
Vertical Fine Alignment Tightening
Screw
Vertical Crude Alignment
Tightening Screw
Vertical Find Alignment Screw
8
Horizontal Fine Alignment Screw
4
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Terminal Wiring
Detector
Description
1
Housing
5
Internal Earth Connection
2
Terminal Board
6
Connection to Handheld Unit
3
Earth Terminal
7
Detector Holding Plate
4
Inlet Conduit /Cable Terminal No.
Function
1
Power +24V DC
2
Return ‐24V DC
3
20-0mA (Input)
4
20-0mA (Output)
5
RS‐485 (+)
6
RS‐485 (‐)
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Flash Source
Description
1
Housing
5
Internal Earth Connection
2
Terminal Board
Earth Terminal
6
N/A
7
Detector Holding Plate
3
4
Inlet Conduit / Cable
Terminal No.
Function
1
Power +24V DC
2
Return ‐24V DC
3
Spare
4
Spare
5
RS‐485 (+)
6
RS‐485 (‐)
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Wiring Configuration
0‐20mA Sink 4‐Wire
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Wiring Configuration
0‐20mA non‐isolated Sink 3‐Wire
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Wiring Configuration
0‐20mA Source 3‐Wire
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Thank You !
Quasar 900
Open Path Gas Detector
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