705 Flammable Gas Sensors; Accessories - Honeywell Sensepoint RFD Technical Manual

0-20% lel and 0-100% lel remote flammable detector

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SENSEPOINT RFD OPERATING MANUAL

RFDMAN MAN0843 Issue 3

4.3.2 705 Flammable gas sensors

The 705 flammable gas sensors are UL certified for use in Class 1, Div. 1, Groups B,

C, D hazardous areas. The sensor comprises an aluminum housing containing a pair

of poison resistant detector elements, with a sintered stainless steel disc forming the

face of the sensor. The housing has a ¾" NPT mounting thread at one end and an

M36 accessory thread on the other end. A plastic Filter Housing screws on to the

accessory thread and holds the filter in position, if required. Two versions are

available:

Standard LEL version

The standard LEL sensor is available for use in temperatures up to +55°C and

detects gas concentrations up to 100% LEL.

High temperature LEL version

The high temperature version is available for use in temperatures up to +150°C and

ranges of 0-20% LEL up to 0-100% LEL depending on transmitter or controller.

Details of connecting these sensors to the Sensepoint RFD transmitter are given in

sections 5 and 6. For sensor more specific details, refer to their individual manuals

(00705M5002 standard temperature version and 00705M5010 high temperature

version).

Standard temperature

High temperature

version

Diagram 3: 705 Flammable sensors

A range of accessories including flow housings, weather protection assemblies,

collecting cones, duct mounting kits and junction boxes are available for use with

these gas sensors. Refer to their individual manuals for further details.

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