DatasheetFEMA negative pressure switches detect the pressure difference relative to atmospheric pressure. All data relating to the switching pressure ranges and thus also the scale divisions on the switching devices are to be understood as the difference in pressure between the releant atmospheric pressure and the set switching pressure. The “zero” reference point on the scale of the unit corresponds to the relevant atmospheric pressure. Degree of Ex-protection: Ex II 2G Ex d e IIC T6 Gb, Ex II 1/2D Ex ta/tb IIIC T80 oC Da/Db
Flame proof enclosure 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.
| Kind of pressure | overpressure, relative | ||||||||||||||
| Pressure connection | internal thread G1/4, external thread G1/2 | ||||||||||||||
| Electrical connection | terminal connection M16x1,5 | ||||||||||||||
| Protection class | IP65 | ||||||||||||||
| Housing material | rugged housing of seawater resistant aluminium die casting GD Al Si 12 | ||||||||||||||
| Sensing element material | 1.4104 + 1.4571 | ||||||||||||||
| Media temp. | -25 … 60 oC | ||||||||||||||
| Media temp. limit | 60oC. Higher temperatures are possible, provided that the limit is safeguarded by suitable measures (e.g. water tube trap, see Accessories for Pressure Switches / Transmitters) | ||||||||||||||
| Ambient temperature | -20 … 60 oC | ||||||||||||||
| Ambient temp. limit | at temperatures below 0 oC, ensure that no water condensation can arise in the sensor and in the switching device | ||||||||||||||
| Switch function/capacity | SPDT Microswitch 250 Vac; capacity 2 A inductive, 3 A resistive | ||||||||||||||
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| Pressure adjustment range | Switching differential | Max. pressure | Type | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| bar | bar | bar | ||||||||||||||||||
| 0.1 … 0.6 | 0.04 | 6 | EX-DWR06 | |||||||||||||||||
| 0.2 … 1.6 | 0.06 | 6 | EX-DWR1 | |||||||||||||||||
| 0.2 … 2.5 | 0.1 | 16 | EX-DWR3 | |||||||||||||||||
| 0.5 … 6 | 0.2 | 16 | EX-DWR6 | |||||||||||||||||
| 0.5 … 6 | 0.25 | 25 | EX-DWR625 | |||||||||||||||||
| 3 … 16 | 0.5 | 25 | EX-DWR16 | |||||||||||||||||
| 4 … 25 | 1 | 63 | EX-DWR25 | |||||||||||||||||
| 8 … 40 | 1.3 | 63 | EX-DWR40 | |||||||||||||||||
| Description | Additional Product Type |
|---|---|
| Syphon for high temperature, steel, U-shape (for more accessories, see Accessories for Pressure Switches / Transmitters) | U430B |