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Technology : Products : Flammable Gas Detection : Methane Detection - VZ

Methane Gas Laser Detection

Highest availability - The best device in fog and rain conditions

Overview

This Open Path Gas Detector (OPGD) is specific to Natural Gas / Methane (CH4). The separate transmitter and receiver assemblies are certified for use in potentially explosive atmospheres and can detect CH4 over distances of 0.5 to 5 meters. Constructed in high grade corrosion resistant 316 Stainless Steel this device is ideally suited for onshore and offshore environments. Typically positioned in front of one or a number of banked ventilation air intakes and with a genuine speed of response of less than 1 second, this device is ideal for fast shutdown of HVAC inlets. With no consumable parts and the patented daily auto-self testing facility called ‘SimugasTM’, the Senscient ELDSTM CH4 VZ ventilation inlet detector offers significant operational cost savings over conventional fixed point and cross duct flammable gas detectors.

Features

  • Fastest speed of response (<1 seconds) ­ Increased safety by providing earlier warning.
  • SimuGasTM daily auto gas testing ­ No manual intervention or on-going cost for routine gas testing.
  • Ultra narrow wavelength operation ­ Improved uptime availability in heavy fog and rain conditions compared to conventional Xenon flash and filament lamp based IR devices.
  • Increased sensitivity over conventional Xenon flash and filament lamp based IR devices e.g. 0-10,25 or 100% LEL ­ Providing earlier detection and faster HVAC inlet shutdown.
  • CH4 specific ­ No false alarms from other hydrocarbon gases, oil mists or even diesel fumes as experienced with many other flammable gas detection technologies including Xenon flash and filament lamp based IR devices.

Applications

Open path Natural Gas /  Methane (CH4) ventilation inlet gas detectors are used to monitor for fugitive emissions and protect plant from the risk of an explosion. These devices are typically located in front of a single of banked set of ventilation air inlet grills to provide fast detection and shutdown of ventilation dampers.

Typical applications include:

  • Oil & gas exploration rigs
  • Oil & gas production platforms and facilities
  • FPSOs
  • Petrochemical refineries
  • Gas turbine combustion air intakes

Specifications:

Gas
Ranges


Path Length
Format

Methane (CH4)
0-10% LEL
0-25% LEL
0-100% LEL
0.5 ­ 5m
Individual Transmitter (Tx) & Receiver (Rx)

Performance:

Response Time
Repeatability
Linearity

T90 =< 1 second
< ± 5% FSD
< ± 5% FSD

Environmental:

Ingress Protection
Enclosure Material
Lens Material Tx
Lens Material Rx
Operating Temperature
Humidity
Vibration
EMC

IP66/67 NEMA type 4/4X/6
316L stainless steel
Faceted Optical Glass
Aspheric Optical Glass
-55°C to +60°C (ambient)
0 -­ 100% RH (non-condensing)
10 ­- 150 Hz, 2 g
EN50270

Certification/Approvals:

CSA and UL
Class I Div 1 Groups B C & D T5
Class II Div 1 Groups E F & G T5
Class III Div 1
Ex d IIB + H2 T5
Class I, Zone 1, AEx d IIB + H2 T5
Tamb = -40°C to +60°C
Entry: ¾” NPT 

ATEX and IECEx:
II 2 GD
Ex d IIB + H2 T5
Tamb -40°C to +60°C Gb
Ex tb IIIC  T100oC
Tamb -40°C to +60°C Db 
IP66/67
Entry: M25

GOST-K 
EAC Ex TR CU Coc
1ExdIIBT5/H2 X
Entry: M25 

GOST-R
EAC Ex TR CU Coc
1ExdIIBT5/H2 X
Entry: M25 

InMetro
Ex d llB + H2 T5 Gb
Ex tb IIIC T100 °C  Db IP66/67
Tamb: -20 °C a +60 °C
Entry: M25

Safety Integrity

Suitable for use in SIL2 Safety Systems per IEC 61508

Electrical:

Operating Voltage
Power Consumption
Outputs (Analog x 2)






Low Signal
Beam Block
Inhibit
Fault
Output (Digital)

Tx & Rx +24V DC , (+18 to +32V DC)
Tx = 12 W (max), Rx = 10 W (max)
4-20 mA,
Configurable for 2 wire isolated or single wire, sink or source.
Primary range on 4-20mA(1)
Secondary range on 4-20mA(2),
Note: Secondary range is typically greater than the primary.
3 mA (configurable 1 to 4 mA)
2.5 mA (configurable 0 to 3.5 mA)
2 mA (configurable 1 to 3.5 mA)
0.5 mA (configurable 0 to 1 mA)
HART 7.1 & MODBUS RTU supported

Mechanical:

Size
Weight
Sun / Deluge Protection

Mounting

Tx/Rx 140 mm dia. x 300 mm
Tx/Rx 12 kg each (c/w bracket)
Tx & Rx supplied with sun / deluge protection
Tx & Rx supplied with mounting brackets incorporating fixing holes / slots for flat surface or metal pole mounting. (Note: mounting poles should be of 4” to 6” (100 to 150mm) diameter. Fixing bolts / U bolts are not supplied)

 

Optical:

Uses HARMONIC FINGERPRINTTM to ensure no false alarms during adverse environmental conditions, misalignment or partial obscuration.

Alignment
Obscuration
Heated Optics
Laser Beam
FDA Accession Number

+/- 2.5°
<= 95%
Tx & Rx lenses are continuously heated.
Class 1 (Eye Safe) IEC 60825-1
1410373-000 (For U.S.A imports)

Calibration :

Factory calibrated for life, no routine calibration required.

Ordering Information:

To order / specify:
Gas type:
Measuring Range:
Path length:
Certification:

Senscient ELDS 1000VZ
CH4
e.g 0- 25% LEL
0.5 - 5m
e.g. ATEX

Accessories:

Approved Interface terminal (PC)
Interface Terminal(tablet)
Optical Alignment Sight
Gassing Cell (Optional)
Snow Cowl (Optional)

open path detectorsopen path detector alignment

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