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Technology : Products : Combined Gas Detection : Hydrogen Sulphide and Methane

Hydrogen Sulphide and Methane Gas Detection

Significant installation cost saving - two gases detectable in one device

Overview

This Open Path Gas Detector (OPGD) detects two gases in a single instrument, Hydrogen Sulphide (H2S) and Methane (CH4). Each of the two detection channels is configured and specific to the target gas. The separate transmitter and receiver assemblies are certified for use in potentially explosive atmospheres and can detect H2S + CH4 over distances of 5 to 60 meters. Constructed in high grade corrosion resistant 316 Stainless Steel this device is ideally suited for onshore and offshore, open and enclosed environments. With no consumable parts and the patented daily auto-self testing facility; called ‘SimugasTM’, the Senscient ELDSTM H2S + CH4 detector offers significant installed and operational cost savings over conventional fixed point toxic and flammable gas detectors.

Features

  • Fastest speed of response (H2S <5 & CH4 <3 seconds) ­ Increased safety by providing earlier warning.
  • Operates up to 60 meters ­ Significant installation cost savings over multiple fixed point gas detectors.
  • No consumable parts ­ No on-going cost for replacement sensing elements and associated service labour.
  • SimuGasTM daily auto gas testing ­ No manual intervention or on-going cost for routine gas testing.
  • H2S & CH4 specific ­ No false alarms from interference gases as experienced with many fixed point toxic gas detectors.
  • BluetoothTM connectivity ­ No physical intervention required for local interrogation, event log downloading and trouble shooting.

Applications

Open path H2S + CH4 gas detectors are used to monitor for fugitive emissions, protect personnel and warn of plant failure. These devices are typically located to provide a detection barrier around the perimeter of a plant, process or storage area; or positioned in close proximity to specific items of plant, that pose a real risk of gas escape: e.g. pump sets, pressure reducers, valves and pipe flanges.

  • Typical applications include:
  • Oil & gas exploration rigs
  • Oil & gas production platforms and facilities
  • Sour gas sweetening and processing plants
  • Petrochemical refineries
  • Waste water treatment plants
  • Landfill sites

Specifications:

Gas
Ranges


 

 


Path Length
Format

Hydrogen Sulphide (H2S) + Methane (CH4)
0-250 ppm.m (H2S) or
0-500 ppm.m (H2S) or
0-15000 ppm.m (H2S)
0-1 LEL.m (CH4)
(FM performance approval FM3049893)

5 - 60m
Individual Transmitter (Tx) &
Receiver (Rx)

Performance:

Response Time

Repeatability
Linearity

T90 =< 5 seconds (H2S)
T90 =< 3 seconds (CH4)
< ± 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

+/- 0.5°
<= 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 2000
H2S + CH4
e.g 0-1 LEL.m + 0- 250 ppm.m
5 - 60m
e.g. ATEX

Accessories:

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

Contact Us For more information

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