Application Notes for Pressure Gauges
Adapt-FS pre-volume deflagration flame arrester

Application
The Adapt-FS flame arrester prevents the propagation of flameson deflagration (subsonic combustion propagated through heattransfer) of explosive vapor/air or gas/air mixtures of explosion
groups IIA, IIB and IIC. The upstream volume (e.g. of a pressuregauge) must be smaller than 0.2 l (see Fig. 2).
SAMSON pressure instruments, such as pressure transmitters,
liquid level or differential pressure meters, pressure gauges andpressure switches, can be connected to zone 0 areas using theAdapt-FS flame arrester as an inline adapter.

Construction
The Adapt-FS flame arrester is designed as an inline adapter.
It consists of a body with a G ½ threaded connection on bothsides and a welded-in stainless steel capillary functioning as theflame arrester. The capillary with a 0.6 mm inside diameter and
23 mm in length allows vapor/air or gas/air mixtures to flow
through it, but prevents the propagation of flames.
Conditions for hazardous areas
The Adapt-FS flame arrester meets the requirements of the harmonized standard ISO 16852 concerning flame arresters as a
non-electrical equipment for potentially explosive areas.
It is tested and approved to be resistant to flame propagationon the deflagration of flammable gases and fluids according tothe EC type examination certificate PTB 12 ATEX 4001 X with
type of protection
IIG IICThe adapter body is marked according to 94/9/EC (ATEX).

Fig. 1: Adapt-FS pre-volume deflagration flame arrester

Ordering data
Adapt-FS pre-volume deflagration flame arrester ∙ Inline
adapter with G ½ female thread and G ½ B male thread,
CrNi steel 1.4571 ∙ Suitable for connection to zone 0
Order no. 8521-1002
Accessories
Seals for connection G ½:–– Flat copper seal according to DIN EN 837-1
6.2 x 17.5 ∙ Order no. 8521-1000–– Corrugated gasket made of 1.4571 according toDIN 19207 ∙ 11.2 x 17 ∙ Order no. 8521-0521

Edition April 2014

Application Notes

AB 10 EN

SAMSON instruments that can be combined with Adapt-FS

Dimensions (in mm)

SAMSON pressure instruments (examples) that can be connected to zone 0 areas using the Adapt-FS flame arrester:

46.520Zone 1Ex   i

Pressure gauge

3Measuring chamber volume < 0.2 lP

26.5

19G½15–– Type 3435 Pressure Transmitter–– Type 3804 Pressure Transmitter–– Media 5 Differential Pressure Transmitter without limitswitches–– Electric pressure transmitters, Ex i version–– Pressure switches, Ex e, Ex d versions–– Pressure gauges etc.

Ex e, Ex dPPressure transmitters

PG½BPressure switch

Fig. 3: Dimensions ∙ Adapt-FS flame arrester
Adapt-FS flame arrester

Zone 0Fig. 2: Installation ∙ Adapt-FS flame arrester

Installation
The following points must be observed during installation andassembly:–– The measuring chamber volume of the connected pressure
instrument downstream of the Adapt-FS flame arrester mustbe smaller than 0.2 l.
–– The leak tightness of joints between the process fluid connection of the instrument and the connection to the plantmust meet the requirements of the separation of zones.
–– The joint must be reliably protected against becoming accidentally untightened. The plant operator is responsible
for taking the necessary measures.
–– Suitable seals which are resistant to the process media
must be used at the joints. To seal the pressure connections with parallel thread shanks, flat gaskets according toEN 837-1 or profile gaskets must be used.
As a general rule, observe the instructions specified in themanual B 29 provided the manufacturer Armaturenbau GmbH.

SAMSON AG · MESS- UND REGELTECHNIK
Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany
Phone: +49 69 4009-0 · Fax: +49 69 4009-1507
Internet: http://www.samson.deAB 10 EN

2014-07-08

Specifications subject to change without notice