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Installation and Maintenance Instruction Manual for All
Stainless Steel Gas Actuated Thermometer Model S5500
(non-electrical device) in a configuration for explosion risk areas pursuant to
Directive 2014/34/EU (ATEX)Zone I and II, Category 2, Group II for gas and dust
range and manufacturer. The gauge can be provided with
additional signs and safety markings advising on special
conditions:
• Advice on the filling liquid
• Advice on calibration
• Ex (for ATEX configuration)
2.6 Safety equipment
The window uses multi-layer safety glass. This device is
fitted with a rear plug capable of being blown out.
2.7 Environmental protection
This device may optionally contain a filling liquid (e.g.
glycerin or silicone oil). The provisions set out in the
REACH regulation on production and use of chemicals
are to be respected.
3 USE IN EXPLOSION RISK AREAS PURSUANT TO
DIRECTIVE 2014/34/EU (ATEX)
Area of use:
Gas actuated thermometers are intended for installation
in pipes, tanks, plant and machinery to measure the
temperatures of gaseous and/or liquid materials. The
requirements for the explosion area are limited to Zone I
and II, Category 2, Group II for gas and dust.
Permitted temperatures:
A temperature class is not specified, since no heating
emanates from the device. The ambient temperature is
limited to the range -30 °C to 80 °C.
For the non-electrical part of the devices, the standards
EN 13463-1, EN 13463-5:2009 and EN 60079-0:2011
are applicable with regard to explosion protection. The
relevant requirements of these standards are satisfied.
The documentation has been filed with TÜV-Nord-Cert
(see declaration of conformity).
Labeling:
II 2 G c or II 2 D c

4 TECHNICAL DATA

The detailed technical information can be found in the
documents in the Appendix, Chapter 12.
© 2021 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0499, www.ashcroft.com
All sales subject to standard terms and conditions of sale. S5500_Gas_Act_Therm_RevA_(008-10293)_05-26-21
5 LABELING ON THE DEVICE
The label with the serial number and type designation is
located on the outside right of the housing. The nature
of the subject characteristics is encoded in the type
designation.
5.1 Overview
The label with the marking for explosion risk areas is
located on the housing.

6 CONSTRUCTION AND FUNCTION

6.1 Overview
1 Bulb
2 Capillary line
3 Movement
4 Bourdon tube
5 Link
6.2 Description of function
The temperature is transferred via thermal conduction to
a compressed inert gas inside the sensor. The properties
of gases mean that any temperature change brings about
a change in pressure, and this is transferred via a capillary
tube (in the fixed stem or executed as a flexible capillary
line) to the Bourdon tube on the gauge. This produces a
deflection of the Bourdon tube that is proportional to the
change in pressure. A rotary movement is produced via a
connecting rod and a movement, which is transferred to
the indicator arm using an arbor. The angle of rotation for
the complete range is approx. 270°.
6.3 Description of components
6.3.1 Bulb
The temperature sensor has a diameter of 6-10 mm and
a length of 55-1000 mm, and contains the inert gas under
pressure. Its active length is 55-190 mm, dependin gon
the diameter. The temperature sensor must not be
subjected to pressure without a supplementary thermowell.
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