Deutsch 
English Honeywell minimum pressure switch (Ex-i) for hot water, steam, fuel gases and liquid fuels (DWR625-574). The pressure limiters in safety technology offer a higher level of safety than normal pressure switches in many respects and are therefore particularly suitable for systems in chemical process engineering and heating technology, where particular emphasis must be placed on safety in pressure monitoring.
The pressure switches can also be used in hazardous areas (zones 0, 1, 2 and 20, 21, 22) and always require an isolating amplifier. The isolating switch amplifier is also responsible for monitoring the lines for short circuits and line breakage and therefore offers an additional safety advantage, even in non-Ex areas. For Ex applications, the isolating switching amplifier must be installed outside the Ex zone. The lines between the isolating amplifier and the pressure switch are monitored for short circuits and line breaks.
Ex ignition protection type: Ex II 1/2G Ex ia IIC T6 Ga/Gb, Ex II 1/2D Ex ia IIIC T80 °C
Intrinsic safety: The equipment used in potentially explosive atmospheres are components of intrinsically safe circuits. A circuit is intrinsically safe if the amount of energy it contains is too low to generate sparks or other thermal effects that could ignite a surrounding flammable atmosphere.
FEMA pressure switches with type of protection Ex-i may only be used in conjunction with a type-tested isolating switch amplifier. The type of protection is determined by the approval of the isolating switch amplifier. In general, pressure switches fall under the category of simple electrical equipment and are therefore not subject to mandatory certification.
Devices in Ex-i design have the typical features for the use of devices in this type of protection. These include microswitches with gold contacts, an internal earthing screw, a blue terminal block and an approved cable entry in blue colour.
Technical data:
Pressure type: positive pressure, relative
Pressure connection: Internal thread: G1/4, external thread: G1/2
Electrical connection: Terminal connection M16x1.5
Protection class: IP65 Medium: Hot water, steam, gas, fuel gas
Ex class: Ex-i
Scale calibration: falling pressure
Switching differential not adjustable
Adjustable pressure range: 0.5...6bar
Fixed hysteresis: 0.2 bar
Max. pressure: 16 bar
Material of the switch housing: Robust housing made of seawater-resistant die-cast aluminium GD Al Si12 Aluminium housing coated with resistant plastic
Materials in contact with the medium: Stainless steel
Medium temperature: -25...60°C
Max. Medium temperature: 60°C. Higher medium temperatures are possible if suitable measures (e.g. siphon) are taken to ensure the above-mentioned limit values on the switchgear
Ambient temperature: -25...60°C
Note on ambient temperature: At ambient temperatures below 0 °C, care must be taken to ensure that no condensation can form in the sensor and the switching device
Switching function: Supply voltage: Ui = 14 V DC Ri = 1500 Ohm Ci = 1 nF Li = 100 microH
Registrations:
• TV-DWFS (SDBFS).17-281
• according to VdTUEV leaflet print 100 edition 03.2017, DIN EN 12952-11:2007 and DIN EN 12953-9:2007
• ID 0000035004 according to DIN EN 764-7:2002 and DIN EN 13611:2008
• CE-0085CL0343 according to DIN EN 1854, edition 07.2006
• IBExU12ATEX1040 according to ATEX 2014/34/EU IECEx IBE 14.0077 SIL2 according to IEC 61508-02
The pressure switches can also be used in hazardous areas (zones 0, 1, 2 and 20, 21, 22) and always require an isolating amplifier. The isolating switch amplifier is also responsible for monitoring the lines for short circuits and line breakage and therefore offers an additional safety advantage, even in non-Ex areas. For Ex applications, the isolating switching amplifier must be installed outside the Ex zone. The lines between the isolating amplifier and the pressure switch are monitored for short circuits and line breaks.
Ex ignition protection type: Ex II 1/2G Ex ia IIC T6 Ga/Gb, Ex II 1/2D Ex ia IIIC T80 °C
Intrinsic safety: The equipment used in potentially explosive atmospheres are components of intrinsically safe circuits. A circuit is intrinsically safe if the amount of energy it contains is too low to generate sparks or other thermal effects that could ignite a surrounding flammable atmosphere.
FEMA pressure switches with type of protection Ex-i may only be used in conjunction with a type-tested isolating switch amplifier. The type of protection is determined by the approval of the isolating switch amplifier. In general, pressure switches fall under the category of simple electrical equipment and are therefore not subject to mandatory certification.
Devices in Ex-i design have the typical features for the use of devices in this type of protection. These include microswitches with gold contacts, an internal earthing screw, a blue terminal block and an approved cable entry in blue colour.
Technical data:
Pressure type: positive pressure, relative
Pressure connection: Internal thread: G1/4, external thread: G1/2
Electrical connection: Terminal connection M16x1.5
Protection class: IP65 Medium: Hot water, steam, gas, fuel gas
Ex class: Ex-i
Scale calibration: falling pressure
Switching differential not adjustable
Adjustable pressure range: 0.5...6bar
Fixed hysteresis: 0.2 bar
Max. pressure: 16 bar
Material of the switch housing: Robust housing made of seawater-resistant die-cast aluminium GD Al Si12 Aluminium housing coated with resistant plastic
Materials in contact with the medium: Stainless steel
Medium temperature: -25...60°C
Max. Medium temperature: 60°C. Higher medium temperatures are possible if suitable measures (e.g. siphon) are taken to ensure the above-mentioned limit values on the switchgear
Ambient temperature: -25...60°C
Note on ambient temperature: At ambient temperatures below 0 °C, care must be taken to ensure that no condensation can form in the sensor and the switching device
Switching function: Supply voltage: Ui = 14 V DC Ri = 1500 Ohm Ci = 1 nF Li = 100 microH
Registrations:
• TV-DWFS (SDBFS).17-281
• according to VdTUEV leaflet print 100 edition 03.2017, DIN EN 12952-11:2007 and DIN EN 12953-9:2007
• ID 0000035004 according to DIN EN 764-7:2002 and DIN EN 13611:2008
• CE-0085CL0343 according to DIN EN 1854, edition 07.2006
• IBExU12ATEX1040 according to ATEX 2014/34/EU IECEx IBE 14.0077 SIL2 according to IEC 61508-02