FF4-8 DAH
Pressure switch with perbunan-diaphragm
adapted for water, oils and air
| Part number | 1010078 |
| Upper switchpoint |
0,5 .... 8 bar |
| Lower switchpoint | 0,2 .... 7,5 bar |
|
Smallest difference lower upper / lower end of range |
0,3 / 0,5 bar |
| Max.operating pressure | 30 bar |
| Max. test pressure | 40 bar |
| Standard setting |
2 / 6 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
|
|