34

Mechanical pressure switches

S2 type series

Switching scheme

Switching device

Ordering position

Additional text

A1

A

DCM6-217A-S

Switching scheme A1

A2

C

DCM6-217C-S

Switching scheme A2

A3

C

DCM6-217C-S

Switching scheme A3

A4

A

DCM6-217A-S

Switching scheme A4

B1

B

DCM6-217B-S

Switching scheme B1

B2

D

DCM6-217D-S

Switching scheme B2

B3

D

DCM6-217D-S

Switching scheme B3

B4

B

DCM6-217B-S

Switching scheme B4

C1

B

DCM6-217B-S

Switching scheme C1

C2

D

DCM6-217D-S

Switching scheme C2

C3

D

DCM6-217D-S

Switching scheme C3

C4

B

DCM6-217B-S

Switching scheme C4

D1

A

DCM6-217A-S

Switching scheme D1

D2

C

DCM6-217C-S

Switching scheme D2

D3

C

DCM6-217C-S

Switching scheme D3

D4

A

DCM6-217A-S

Switching scheme D4

Note on ordering additional function ZF217

FEMA pressure switches of the

DCM (except

DCM1000, DCM4016 and DCM4025),

VCM

(except VCM4156),

VNM, DNS, VNS series can

be equipped with 2 microswitches.

This is not possible with any other type

series or with Ex versions.

Technical data

Standard equipment

The standard equipment of every two-stage

pressure switch includes a switching device

with 2 microswitches, both single-pole

switching. Switch I monitors the low pressure,

switch II the higher pressure. The setting

ranges indicated in the data sheets for the

basic types apply to the two-stage pressure

switches as well. It should be noted that the

switching differentials of the individual

microswitches may not be exactly the same

due to component tolerances.

Switching difference

The switching interval of the two microswitches

is the difference (in bar or mbar) between the

switching points of the two micro switches.

Example for ZF307:

When the pressure rises (e.g. 2.8 bar), a

two-stage pressure switch turns on a warning

light, and if the pressure continues to rise (e.g.

3.2 bar) the system shuts down. The switching

interval is 3.2-2.8 = 0.4 bar. The following

applies to all versions:

The switching interval remains constant over

the whole setting range of the pressure switch.

If the switching pressure setting is changed

with the setting spindle, the switching interval

does not change - the switching points are

moved in parallel.

Switching differential

The switching differential, i.e. the hysteresis of

the individual micro switches, corresponds to

the values of the relevant basic version referred

to in the Product summary. In the case of

two-stage pressure switches,

the switching

differential of the individual micro switches

is not adjustable.

Versions

Two-stage pressure switches are available in

three different versions, each identified by a ZF

number. The versions differ in terms of their

connection schemes and electrical connection

types (terminal or plug connection).

S2 type series

Pressure switches with 2 microswitches - technical data

The applicable data sheet for the basic types contains the technical data for the two-stage pressure

switches. This includes all limits of use, such as temperature, maximum pressure, mounting position,

protection class, electrical data etc. The principal dimensions are the same as for single-stage

pressure switches with comparable pressure ranges and design features.

ZF307

Factory setting

according to

customer’s

instruction

Switching difference

fixed

Terminal

connection

(All terminals

of both

microswitches

are accessible

(6 terminals)

2 x single-pole

switching

1. Basic type with ZF 307

2. Switching points I

and II, with direction

of action in each

case (rising or falling

pressure)

Example: DCM16-307

Switching point I:

10 bar falling

Switching point II:

12 bar falling or

switching interval only.

ZF217

Adjustable

via adjustment

knobs I and II in

accordance with

"Switching

difference" table

Plug connection

in accordance with

DIN EN175301

(3-prong + earth

conductor)

Function-

appropriate

internal wiring in

accordance with

"Switching

functions" table

Example selection

in accordance

with "Switching

schemes" table,

page 36.

1. Basic type with

ZF217

2.

Switching scheme

For example:

DCM16-217/B 4

Since all values are

adjustable within the

specified limits, no

further data is required.

Additional Switching difference Electrical

Connection

Ordering

function

between the two

connection

diagram

information required

micro switches