Honeywell 705 HT Specifications

Model 705 HT Sensor

High temperature sensor
for combustible gases

Model 705
High Temperature Sensor

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

Flexibility

• 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

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.

General Specication

General Specification

Range 0-20% LEL, 0-100% LEL (Control card dependent)

Speed of Response2 T60 Less than 6 seconds.

T90 Less than 10 seconds.

Minimum Alarm Level3 5% LEL

Output Signal mV bridge

Operating Temperature -25°C to +150°C (-13°F to +302°F)

Operating Humidity Continuous: 20 to 90% RH

Intermittent: 10 to 99% RH

Operating Pressure 75 to 110kPa (750 to 1100mbar)

Stability (zero) With time: Less than ±5% LEL/year

With temperature: Less than ±3% LEL
With humidity: Less than ±3% LEL
With pressure: Less than ±3% LEL

Stability (span) With time: Less than ±5% LEL/year
With temperature: Less than ±4% LEL
With humidity: Less than ±3% LEL
With pressure: Less than ±3% LEL

Linearity Better than ±5% fsd

Repeatability Better than ±2% LEL

Warm-up Time 30 minutes

Detector Operating Life4 More than 5 years (typical)

Storage Life Typically, no degredation has been observed in clean, stable conditions for up to 5 years

Power Consumption 0.7W at 200mA

Enclosure Material Aluminum

Mounting Thread 3⁄4“ NPT

Weight 200g (7oz)

Certification UL Hazardous location approval

Class1, Div1, groups B, C and D Tamb: -25°C to +150°C

1

Notes:

1. Typical performance figures for a sensor calibrated on 10% LEL methane and tested at 20°C and 50% RH.

2. T60/T90 defined as the time to achieve 60% and 90% of the signal obtained after 5 minutes exposure to 50% FSD gas concentration.

3. With recommended 3 month calibration period.

4. In clean atmosphere.

82.5mm
(3.24in)

42mm

(1.65in)

Find out more

Contact Honeywell Analytics:

www.honeywellanalytics.com

Europe, Middle East, Africa

Life Safety Distribution AG
Wilstrasse 11-U31
CH-8610 Uster
Switzerland
Tel: [phone]
Fax: [phone]
[e-mail]

Our Product Range

Find out more

Contact Honeywell Analytics:

www.honeywellanalytics.com

Europe, Middle East, Africa

Life Safety Distribution AG
Wilstrasse 11-U31
CH-8610 Uster
Switzerland
Tel: [phone]
Fax: [phone]
[e-mail]

Americas

Honeywell Analytics Distribution, Inc.
405 Barclay Blvd.
Lincolnshire, IL 60069
USA
Tel: [phone]
Toll free: [phone]
Fax: [phone]
[e-mail]

Find out more

Contact Honeywell Analytics:

www.honeywellanalytics.com

Europe, Middle East, Africa

Life Safety Distribution AG
Wilstrasse 11-U31
CH-8610 Uster
Switzerland
Tel: [phone]
Fax: [phone]
[e-mail]

Americas

Honeywell Analytics Distribution, Inc.
405 Barclay Blvd.
Lincolnshire, IL 60069
USA
Tel: [phone]
Toll free: [phone]
Fax: [phone]
[e-mail]

Asia Pacific

Honeywell Analytics Asia Pacific
#508, Kolon Science Valley (1)
187-10 Guro-Dong, Guro-Gu
Seoul, 152-050,
Korea
Tel: [phone]
Fax: [phone]
[e-mail]

Find out more

Contact Honeywell Analytics:

www.honeywellanalytics.com

Europe, Middle East, Africa

Life Safety Distribution AG
Wilstrasse 11-U31
CH-8610 Uster
Switzerland
Tel: [phone]
Fax: [phone]
[e-mail]

Americas

Honeywell Analytics Distribution, Inc.
405 Barclay Blvd.
Lincolnshire, IL 60069
USA
Tel: [phone]
Toll free: [phone]
Fax: [phone]
[e-mail]

www.honeywell.com

Technical Services

[e-mail]

Asia Pacific

Honeywell Analytics Asia Pacific
#508, Kolon Science Valley (1)
187-10 Guro-Dong, Guro-Gu
Seoul, 152-050,
Korea
Tel: [phone]
Fax: [phone]
[e-mail]

Fixed Gas Monitoring

Honeywell Analytics offers a wide range
of fixed gas detection solutions for a
diverse array of industries and applications
including: Commercial properties, industrial
applications, semiconductor manufacturers,
energy plants and petrochemical sites.

Detection of flammable, oxygen and toxic

»

gases (including exotics)

Innovative use of 4 core sensing

»

 technologies–papertape,
electrochemical cell, catalytic bead
and infrared

Capability to detect down to Parts Per

»

Billion (ppb) or Percent by Volume (%v/v)

Cost effective regulatory compliance

»

solutions

Please Note:

While every effort has been made to ensure accuracy in this publication, no responsibility can be accepted for errors or omissions.
Data may change, as well as legislation, and you are strongly advised to obtain copies of the most recently issued regulations,
standards, and guidelines. This publication is not intended to form the basis of a contract.

H_Model 705 High Temperature Sensor_DS0301_V3_EMEA

09/07

© 2007 Honeywell Analytics

Portable Gas Monitoring

When it comes to personal protection from
gas hazards, Honeywell Analytics has a wide
range of reliable solutions ideally suited for
use in confined or enclosed spaces.
These include:

Detection of flammable, oxygen and

»

toxic gases

Singlegaspersonalmonitors–wornby

»

the individual

Multi-gasportablegasmonitors–used

»

for confined space entry and regulatory
compliance

Multi-gastransportablemonitors–used

»

for temporary protection of area
during site construction and
maintenance activities

Technical Services

At Honeywell Analytics, we believe in the
value of great service and customer care.
Our key commitment is providing complete
and total customer satisfaction. Here are just
a few of the services we can offer:

Full technical support

»

Expert team on hand to answer

»

questions and queries

Fully equipped workshops to ensure

»

quick turnaround on repairs

Comprehensive service engineer network

»

Training on product use and maintenance

»

Mobile calibration service

»

Customised programmes of

»

preventative/corrective maintenance

Extended warranties on products

»

10729