FF4-4 DAH

Pressure switch with perbunan-diaphragm

adapted for water, oils and air

 

Part number 1010062
Upper switchpoint

0,22 .... 4 bar

Lower switchpoint 0,07 .... 3,75 bar

Smallest difference lower

upper / lower end of range

0,15 / 0,25 bar
Max.operating pressure 24 bar
Max. test pressure 40 bar
Standard setting

1 / 3 bar

Connector G 3/8" Silumin
weight ca. 0,5 kg
Ambient temperature range -20 .... +70°C
Perm. medium temperature 0 .... +70°C
Protection acc.too DIN 40 050/IEC 529 with rubber grommet IP 54 (Standard)
Protection acc.too DIN 40 050/IEC 529 with cable glands M20 IP 65
Rated operating current at AC1 230V 16A
Rated operating current at AC1 400V 10A
Rated operating current at AC15 230V 6A
Rated operating current at DC13 230V 0,1A
Permissible motor power 1  230V 0,55 kW

The pressure at port pressure of the monitored medium is - depending on the pressure range - on a flat membrane and operated via a lever system and springs on a cascade switch. It guarantees flutterfree switching. The switches operate independent of the position.

If there is no pressure on the membrane the contact 1-2 is closed. Pump or compressor may start.
If the set upper switching point is reached, contact 1-2 opens and contact 1-4 closes. Pump or compressor will be switched off.

Contact 1-2 will only be restored when the pressure on the membrane has dropped to the set lower switching point. The upper and lower switching point can be adjusted with a screwdriver independently. For each switching point, a scale exists.

Image: FF 4-8 DAH

 

Table for  Medium-compatibility
Medium name
Chemical Formula
Stainless steel
Perbunan
Viton
Plastc
Acetylene CH3COCH3
x
 
 
 
Acetylen HC = CH
x
x
x
x
Air -
x
x
x
x
Benzene Sulphur-free
x
 
x
 
Butane C4H10
x
x
x
x
Butyl acetate CH3COOC4H9
x
 
 
 
Butyl alcohol CH3-CH2-CH2-CH2-OH
x
 
 
 
Carbon dioxide CO2
x
x
x
x
Carbonic acid H2CO3
x
x
x
x
Chlorine CI2
 
 
x
 
Crude oil -
x
x
x
x
Diesel oil -
x
x
x
x
Ethyl acetate CH3OOOC2H5
x
x
x
x
Fuels Leaded petrol
x
x
x
x
Fuels Benzene
x
 
x
 
Glycerine CH2OH-CHOH-CH2OH
x
x
x
x
Glycol CH2OH-CH2OH
x
x
x
x
Heating oil -
x
x
x
x
Hydrogen H2
x
x
 
x
Inert gases -
x
 
 
 
Methanol CH3OH
x
 
 
 
Methyl chloride CH3CI
x
 
 
 
Natural gas -
x
x
x
x
Nitrogen N2
x
x
x
x
Oils Mineral
x
x
x
x
Oils Vagetable
x
x
x
 
Oxygen O2
x
 
x
 
Ozone -
x
 
x
 

Perchlorethylene

CCI2=CCL2
x
 
x
 
Petrol alle Sorten
x
 
x
 
Phenolic acid C6H5(OH)
x
 
 
 
Sulphar dioxide SO2
x
 
 
 
Toluene (Metyl benzene) C6H5CH3
x
 
x
 
Trichlorethene CHCI=CCI2
x
 
x
 
Water Steam/vapor
x
x
x
 
Water Destilled, de-aerated
x
x
x
x
Water Sea water
x
x
 
x
Xylene C6H4(CH3)2
x
 
x