705 High Temperature Flammable Gas Sensor

Overview

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 insolvent based printing and coating machines.

Key features

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

Applications

Confined space entry
Oil, gas and petrochemical
Wastewater and sewage
Steel and chemical plants

Standards and certification

Supplier: ISO 9001:2015 certified

PRODUCT DATASHEETDoc. SSLS/DS/GD-002 · Rev. 01 · 13-Oct-2026

705 High Temperature Flammable Gas Sensor – technical data

Technical specifications

Brand	Honeywell
Alarm Settings	5% LEL
Storage Life	Up to 5 years
Repeatability	Better than ±2% LEL
Weight range	Collecting Cone: 175 g / Sample Flow Housing: 110 g / Sensor: 200 g / Weather Protection Housing: 52.4 g
Dimension	78 mm x 55 mm (Sensor) / 87 mm x 165 mm dia (Collecting Cone) / Sample Flow Housing: 61 mm x 45 mm x 31 mm / Weather Protection Housing: 76.5 mm x 50.8 mm dia
Humidity Range	Continuous: 20 to 90% RH / Intermittent: 10 to 99% RH
Accuracy	0-100% LEL
Maximum Pressure	110 kPa
Gas Type	Flammable
Warm Up Time	30 min
Stability (zero)	With Humidity: < ±3% LEL / With Pressure: < ±3% LEL / With Temperature: < ±3% LEL / With Time: < ±5% LEL/yr
Stability (span)	With Humidity: < ±3% LEL / With Pressure: < ±3% LEL / With Temperature: < ±4% LEL / With Time: < ±5% LEL/yr
Speed of Response	T60 < 6 sec / T90 < 10 sec
Signal Output	mV Bridge
Mounting Thread	3/4 in NPT
Measuring Range	0-20% LEL, 0-100% LEL (Control Card Dependent)
NEMA Rating	NEMA 4X
Power Consumption	0.7W @200 mA
Enclosure Material	Aluminum
Industry	Energy

PRODUCT DATASHEETDoc. SSLS/DS/GD-002 · Rev. 01 · 13-Oct-2026

705 High Temperature Flammable Gas Sensor – ordering and care

Ordering information

Brand	Honeywell

Inspection and care

Keep sensors and filters clean, charge batteries as directed and record bump tests and calibrations.

Storage

Store in a cool, dry place away from direct sunlight, heat and chemicals.

Data given in good faith from manufacturer information and subject to change without notice. Select PPE based on a site risk assessment. Scan the code for the product page.