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The Safe Choice for
Industrial Gas Detection

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Frequently Asked Questions

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What gases can ELDSTM detect?

Q: What flammable gases can ELDSTM detect?

A: ELDSTM products are available for gas specific detection of Methane and Ethylene. Other specific flammable gases will be added over time. Contact us for the availability of any other specific flammable gas.

A: An alternative ELDSTM product is available for the detection of a range of hyrocarbons (e.g. Methane, Ethane, Propane, Butane, Pentane, Ethylene, Propylene & Butene). This 'Multi-Hydrocarbon' device offers better uptime availability in heavy rain and fog plus better accuracy of gas concenration across the full range of hydrocarbons than traditional NDIR devices.

Q: What toxic gases can ELDSTM detect?

A: Currently ELDSTM products are available for Ammonia, Carbon Dioxide, Hydrogen Sulphide, Hydrogen Chloride and Hydrogen Fluoride. Other toxic gases will be added over time. Contact us for the availability of any other specific toxic gas.

Q: What two gas combinations are available with ELDSTM ?

A: Currently there are two combination gas versions of ELDSTM: Methane with Hydrogen Sulphide and Multi Hydrocarbon with Hydrogen Sulphide. Other two gas combinations will be added over time. Contact us for the availability of any other two gas combination.

Why use Senscient ELDSTM

Q: What advantages does ELDSTM have over conventional flammable infrared open path gas detection?

A: Laser based gas detection is gas species specific and will only respond to the target gas. This removes any cross interference and unwanted alarms from other hydrocarbon gases, oil mists and plastic bags that may be present in the area.

A: Laser based gas detection can provide higher detection sensitivity (ppm.m as well as LEL.m). This allows reliable alarm thresholds to be set at much lower levels resulting in faster activation of executive actions or plant evacuation.

A: ELDSTM employs a unique, integral, daily auto self-testing facility, negating the need for regular manual testing using optical filters or test gas chambers.

Q: What advantages does ELDSTM have over conventional toxic point gas detectors?

A: Open path toxic gas detection often results in a reduced number; or total removal, of fixed point toxic gas detectors and their associated cost to supply, install and maintain.

A: Laser based gas detection is gas species specific and will only respond to the target gas. This removes any cross interference and unwanted alarms.

A: ELDSTM employs a unique, integral, daily auto self-testing facility, negating the need for regular manual testing using test gases and all associated costs.

A: ELDSTM does not have any consumable parts unlike electrochemical cell based fixed point gas detectors, which need their sensing elements replaced on a regular basis; saving the cost associated spares and service labour.

A: ELDSTM has a faster speed of response (T90 <3 seconds) compared to electro-chemical cell and semiconductor based point detectors which can take between 30 seconds and over 2 minutes to respond.

What markets and applications use ELDSTM ?

Q: What market sectors use ELDSTM detectors?

A: Several hundred ELDSTM units have been supplied and installed around the world. End users include major organisations operating in oil and gas exploration and production, petrochemical, chemical, fertilizer, power generation and waste water treatment markets. Contact us for more specific project / application references.

Q: What applications are ELDSTM detectors being used for?

A: ELDSTM systems are being used by plant operators who wish to monitor for fugitive emissions of flammable or toxic gases to protect plant and personnel whilst maintaining business continuity. ELDSTM detection solutions have been installed in indoor and outdoor environments.

A: ELDSTM systems have been installed to provide perimeter detection of fugitive gas clouds leaving a process area or entering a construction site adjacent to a process area. Detection over; or adjacent to; process plant that may offer a high risk of gas release e.g. pump rows, or on HVAC inlets.

A: ELDSTM systems have been installed in both potentially explosive atmospheres and designated safe (non explosive) atmospheres. ELDSTM installations offer a wide area of detection along with a reduction in installation and routine maintenance costs compared to fixed point gas detectors.

How does it work?

Q: How does ELDSTM work?

A: Laser light, at a specially selected wavelength for the target gas, is generated by a transmitter and projected over an open area to a receiver. The receiver processes the light signal and calculates the gas concentration. Any target gas present in the beam causes a change in the light signal which is specific to the target gas. The amplitude of this signal (called a harmonic fingerprint) correlates to the gas concentration.

Q: How does the Daily auto-test (SimuGasTM) facility work?

A: This patented facility uses a retained sample of the target gas within the transmitter to generate a test gas signal every 24 hours. This test signal is sent to the receiver for processing and confirms operation without the need for manual intervention or the need to externally apply test gas or optical filters.

Terminology

Q: What is ELDSTM?

A: Senscient's product range uses Tuneable Laser Diode Spectroscopy (TLDS) as the core detection principle. Senscient's adaptation of this proven technology plus sophisticated signal processing has resulted in the Enhanced Laser Diode Spectroscopy (ELDSTM) range of open path toxic and flammable, open path gas detectors.

Q: What is SimuGasTM?

A: SimuGasTM is a unique, patented daily auto-test facility on all Senscient ELDSTM units. This facility provides daily verification of the systems operation without the need for manual intervention or the need for externally applied test gas or optical filters. As well as providing an alarm in the event of a test failure, each test result is held in an internal event log for future retrieval.

Q: What is LFL.m?

A: Lower flammability limit (LFL) usually expressed in volume percent, is the lower end of the concentration range over which a flammable mixture of gas or vapour in air can be ignited at a given temperature and pressure. The flammability range is delineated by the upper and lower flammability limits. Outside this range of air/vapor mixtures, the mixture cannot be ignited (unless the temperature and pressure are increased).

Q: What is ppm.m?

A: ppm.m (parts per million metre) is the recognised unit of measure for a toxic or flammable gas being detected over an open path. For example 250 ppm.m can represent a 1 meter wide gas cloud whose concentration is 250 ppm of the target gas or a 2 meter gas cloud with a concentration of 125 ppm.

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