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705 HT Series of Flammable Gas Sensors

705 HT Series of Flammable Gas Sensors


The Model 705 high temperature sensor has been specifically designed for the detection of combustible gases in high temperature hazardous area locations.  Typical applications include turbine enclosures and drying ovens used in solvent based printing and coating machines.

These applications require a sensor that provides reliable and stable detection allowing low-level alarm settings across a wide temperature range. Utilizing a specially matched pair of Sieger poison resistant combustible gas detection elements, the Model 705 High Temperature Sensor has a very stable baseline allowing alarm trip points to be set as low as 5% LEL across a temperature range of -25°C to +150°C (-3°F to +302°F). The gas measuring range can be configured from 0-20% LEL up to 0-100% LEL depending on the type of controller used. 

The detector elements are housed in a UL hazardous area approved explosion proof assembly, and provide an industry standard 3 wire mV bridge output which can be connected to a suitable control device or converted to an analog output signal via a field transmitter.


Additional Features and Benefits:

Excellent Performance
•  Certified for hazardous location operation  up to +150°C (+302°F)
•  Alarm trip points as low as 5% LEL
•  Fast speed of response
•  Poison resistant detectors
•  Low power consumption


Cost Effective

•  Low cost disposable sensor
•  Greater than 5 year typical operating life


Reliable Operation

•  Specially matched ‘Sieger’ detectors provide highest stability
•  Proven technology from the World leader in combustible gas detection



•  Measuring ranges from 0-20% LEL to 0-100% LEL
•  Wide range of accessories


Robust Construction
•  UL approved explosion proof enclosure
•  High grade Aluminum construction.

  • Product Info

    UL certified, explosion-proof flammable gas detectors with high temperature version certified to 150°C.


    Features & Benefits

    • Fast response speed/low power consumption
    • Greater than 5 year operating life
    • High-grade aluminum construction 


    Quick Specs

    •  Operating temperature range: -25° to +150°C (-13°F to +302°F)
    •  Operating pressure: 75 to 110kPa (750 to 1100mbar)
    •  Range: 0-20% LEL, 0-100% LEL (control card dependent)
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  • Delivery

    We aim to Delivery products with you within 4 weeks of receipt of order. However, in exceptional circumstances delivery may be up to 6 weeks due to manufacturer lead times. Please inform us if you require fast delivery as we will do our utmost to expedite your order.

  • Quantity Orders

    Please contact us directly to discuss quantity purchases and additional discounts.  We will subsequently provide you with a formal quote with the applied discount, which will be valid for 30 days 

  • Hire

    Many of the products you have seen are available for hire, so feel free to contact us if you would prefer to hire this instrument.

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