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产品目录型号:
FEMA压力开关
FEMA压力变送器
Ex-DCM4016压力开关
Ex-DCM4025压力开关
Ex-DNM10压力开关
Ex-DNM63压力开关
DCM25压力开关
DWR3压力开关
DPS200空压开关
DPS400空压开关
DPS500空调过滤开关
DPS1000空调过滤开关
DPS2500风压开关
FEMA菲玛压力开关/压力变送器Type series DNM系列选型资料    
 

Technical data Pressure connection External thread G 1/2 (pressure gauge connection) according to DIN 16 288 and internal thread G 1/4 according to
ISO 228 Part 1.Switching device Robust housing (700) made of seawater resistant die cast aluminium GD Al Si 12.Protection class IP 65, in vertical position.Pressure sensor materials Ex-DNM Metal bellows: 1.4571 Sensor housing: 1.4104 Ex-DCM4016/ Diaphragm: Perbunan Ex-DCM4025 Sensor
housing: 1.4301 Mounting position Vertically upright.Ambient temp. at switching device –20…+60 °C Max. medium temperature The maximum medium temperature at the pressure sensor must not exceed the permitted ambient temperature at the switching device. Higher medium temperatures are possible
provided the above limit values for the switching device are ensured by suitable measures (e.g. siphon).Mounting Directly on the pressure line (pressure
gauge connection) or on a flat surface with two 4 mm Ø screws.Switching pressure Adjustable from outside with screw driver.Contact arrangement Single
pole change over switch.he 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."

Ex-DCM4016 1…16 mbar 0,2 ... 2 mbar 1 bar Perbunan 4 + 11
Ex-DCM4025 4…25 mbar 0,2 ... 4 mbar 1 bar + 1.4301 4 + 11

Ex-DNM10 1…10 bar 0,05 ... 0,3 bar 25 bar 4 + 17
Ex-DNM63 16…63 bar 0,2 ... 2,0 bar 130 bar 4 + 16

DPS200 20...200 (Pa) 10 (Pa) ±5% (min. 5 Pa)
DPS400 40...400 (Pa) 20 (Pa) ±5% (min. 5 Pa)
DPS500 50...500 (Pa) 20 (Pa) ±2.5% (min. 5 Pa)
DPS1000 200...1000 (Pa) 100 (Pa) ±1%
DPS2500 500...2500 (Pa) 150 (Pa) ±1%

 
  G e n e r a l i n f o r m a t i o n a b o u t explosion p r o t e c t i o n Zone classification Explosion risk areas are grouped into zones according to the likelihood of a dangerous explosive atmosphere according to EN 1127-1 occurring. When assessing the explosion hazard, i.e. when identifying explosion risk areas, the "Guidelines for the Avoidance of Danger due to Explosive Atmospheres with Examples (ExRL)" of the German
Insurance Association for the Chemical Industry must be taken into account. If the situation concerns a special case or if doubts exist as to the definition of explosion risk areas, the matter shall be decided by the supervisory authorities (Trade Supervisory Office, where applicable
with the assistance of the Insurance Association or the Technical Control Boards. In Zones 0 (20) and 1 (21), only electrical equipment for which a type test certificate has been issued by a recognized testing agency may be used. In Zone 0 (20), however, only equipment expressly
authorized for that zone may be used. Equipment approved for use in Zones 0 (20) and 1 (21) may also be used in Zone 2 (22). Under the new European Directive 94/9 EC (ATEX 100a), a distinction is made between gas atmospheres and dust atmospheres. This results in the following zone
   
       
       

 

 

 

 
 

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