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Mechanical pressure switches

Additonal functions/Connecting schemes

Pressure switches and pressure monitors

Additional functions for Ex-i-equipment

· Housing (500) with terminal connection (IP 65), "blue" cable entry and terminals.

· Also available with resistor combination for line break and short-circuit monitoring (with isolating amplifier).

Important:

All pressure switches with the ZF5… additional functions listed here can only be operated in combination with

a suitable isolating amplifier.

Additional information:

Our pressure switches and thermostats are considered to be "simple electrical equipment" within the meaning

of standard EN60079-11: 2007. Testing is not mandatory for this type of equipment.

ATEX-Certificate: please see page 10 – 13

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Additional functions for Ex-ia-equipment

Connection scheme

Gold-plated contact

ZF513

single pole switching, fixed hysteresis,

not adjustable

Switching capacity:

max. 24 VDC, 100 mA, min. 5 VDC, 2 mA

For the power supply circuit:

Ui 24 V DC

Ii

100 mA

Ci 1 nF

Li

100 µH

Versions with resistor combination for line break and short-circuit monitoring in control current circuit, see DBS series,

pages 54 – 56:

For the power supply circuit:

Ui 14 V DC

Ri 1500 Ohm

Ci 1 nF

Li

100 µH

Normally closed contact with resistor

ZF574

combination, for

minimum pressure

monitoring, gold-plated contact,

plastic-coated housing (chemical version).

Normally closed contact

with reclosing

ZF575

lockout and resistor combination,

for

minimum pressure monitoring,

plastic-coated housing (chemical version).

Normally closed contact with resistor

ZF576

combination, for

maximum pressure

monitoring, gold-plated contact,

plastic-coated housing (chemical version).

Normally closed contact

with reclosing

ZF577

lockout and resistor combination,

for

maximum pressure monitoring,

plastic-coated housing (chemical version).

see

DBS series

pages 54 – 56

II 1/2G Ex ia IIC T6 Ga/Gb

II 1/2D Ex ia IIIC T80 °C

DWAM6-576

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