Technical data Pressure connection External thread G 1/2 to DIN 16 288 and internal thread G 1/4 to ISO 228 Part 1 (permissible up to 4 bar).

Switching device Seawater resistant die cast aluminium GD AI Si 12. Protection class IP 65 Pressure sensor materials See Product Summary

Ambient temperature –20 to +60°C. At ambient temperatures below 0°C, ensure that condensation cannot occur in the sensor or in the switching device.

Maximum working pressure See Product Summary Mounting Either directly on the pipe or with two 4 mm ø screws on the wall surface. Mounting position Vertically upright Setting Continuously adjustable via the setting spindle with a screw driver. The set switching pressure is visible in the scale window. Switching differentials Largely independent of the set switching pressure. Not adjustable. For values see Product Summary

Pressure measuring connection Care must be taken to ensure that a pressure measuring connection is available in a suitable place on the gas appliance

Switching 250 VAC 250 VDC 24 VDC capacity (ohm) (ind) (ohm) (ohm) Ex-d 3 A 2 A 0.1 A 3 A

Basic principle The basic principle of explosion protection is that: a) combustible materials (gas, steam, mist or dust) in dangerous quantities b) air (or oxygen) c) ignition sources must not occur in the same place. The permanent or temporary occurrence of explosive mixtures as per a) and b) is often unavoidable, therefore when operating electrical installations care must be taken to ensure that no ignition sources can occur. In order to accomplish this, standards have been legislated in Europe serving as a basis for various different types of ignition protection. These standards have been recognized in all European countries. Equipment for the reliable prevention of the ignition of ambient explosive gas mixtures must be constructed according to these standards. In addition to ISO9000ff applies to the production monitoring, the ISO/IEC 80079-34 for ex-protected areas. These standards are based on European Directive 2014/34/EU (ATEX). The goal of this regulation is the harmonization of statutory regulations EN60079 in the area of explosion protection as well as the elimination of trade barriers between Member States. This Directive provides for the harmonization of all standards relevant to the construction of equipment with ignition protection. The most important types of ignition protection for

FEMA products are as follows: "Ex-d" pressure proof encapsulation EN 60079-1 "Ex-e" enhanced safety EN 60079-7 "Ex-t" protection via housing EN 60079-31 "Ex-i" intrinsically safety EN 60079-11 Pressure switches Specially designed FEMA Ex-protected pressure switches are available for use in ex-protection areas. They conform to these standards and are type-tested (Ex-d, Ex-e, Ex-t) and / or have been technically prepared for these areas (Ex-i). "Ex-d" Pressure-Proof Encapsulation Switch components and other electrical functional units capable of igniting explosive gas mixtures are encapsulated in a housing which will survive the explosive pressure of an internal explosion and the special design of which prevents the transference of this explosion to the ambient atmosphere. "Ex-e" Enhanced Safety This type of ignition protection pertains to the special design of the terminal connection housing. The connection area is grouted and thus specially separated from the microswitch. A type tested terminal block, a type tested cable gland, and the IP65 protection degree all ensure an enhanced safety of "Ex-e" in the connection housing. "Ex-t" Protection via Housing This type of ignition protection pertains to dust explosion protection and is based upon the reliable protection of ignition sources against atmospheric dust. For FEMA pressure switches and thermostats for use in dust explosion protected areas, a protection degree of IP65 is required. Together with devices according to "Ex-d" and "Ex-e," devices with "Ex-t" protection are approved for use in gaseous and dust laden atmospheres. "Ex-i" Intrinsically Safety The equipment employed in explosion relevant areas are components of inherently safe electrical circuits. An electrical circuit is inherently safe if the amount of energy it contains is so small that no spark or other thermal effect can arise. This reliably prevents the ignition of explosive gas mixtures in the proximity of this equipment. In the context of this directive, pressure switches and thermostats containing no switching components with energy storage effects are referred to as "simple electrical equipment." G

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