35

Mechanical pressure switches

S2 type series

S2 type series (selection)

ZF217 pressure switches with two microswitches

and switching difference

Switching difference of two-stage pressure switches (ZF217, ZF307)

Type series

S2

ZF217

ZF307

Higher pressure

Lower pressure

min. switching

max. switching difference (mean values)

difference

Type

Factory

Switching scheme Switching scheme Switching scheme

default

A1/A3/B2/B4

A2/A4/C2/C4

B1/B3/D1/D3

C1/C3/D2/D4

+ ZF307

DCM06

40

mbar

165

mbar

190 mbar

140

mbar

DCM025

20

mbar

140

mbar

160 mbar

120

mbar

DCM1

40

mbar

240

mbar

280 mbar

200

mbar

DCM3

0.1

bar

0.65

bar

0.75 bar

0.55

bar

DCM6

0.15

bar

0.95

bar

1.2 bar

0.8

bar

DCM10

0.25

bar

1.6

bar

1.85 bar

1.35

bar

DCM16

0.3

bar

2.0

bar

2.3 bar

1.7

bar

DCM25

0.6

bar

4.0

bar

4.6 bar

3.4

bar

DCM40

0.9

bar

6.0

bar

6.9 bar

5.1

bar

DCM63

1.3

bar

8.5

bar

9.8 bar

7.2

bar

DNM025

35

mbar

215

mbar

240 mbar

180

mbar

VCM095

40

mbar

300

mbar

340 mbar

260

mbar

VCM101

40

mbar

260

mbar

300 mbar

220

mbar

VCM301

20

mbar

100

mbar

120 mbar

80

mbar

VNM111

50

mbar

310

mbar

360 mbar

260

mbar

Switching devices with adjustable switching difference

Additional function ZF217

On switching devices with additional function ZF217, the switching differene is continuously

adjustable via two adjustment knobs I and II accessible from outside. The maximum possible

switching difference is stated in the "Switching difference" table.

Turning adjustment knob I clockwise produces a lower switching point for microswitch I

Turning adjustment knob II anticlockwise produces a higher switching point for microswitch II

Adjustment knobs I and II have an internal stop to prevent the micro switches from being adjusted

beyond the effective range.

Adding together the adjustments on knobs I and II results in the switching difference between the two

micro switches. Changes made with the setting spindle do not affect the switching difference. The

switching difference remains constant over the whole setting range of the spindle. The two switching

points are moved up or down in parallel.

Recommended adjustment method for switching devices with ZF217

1. Set adjustment knobs I and II

to their basic positions.

Turn adjustment knob I

anticlockwise as far as possible.

Turn adjustment knob II

clockwise as far as possible.

2. Adjust the setting spindle

S by the scale to a value midway between the desired upper and lower

switching points.

3. With pressure applied, set the lower switching point with adjustment knob I.

4. In the same way as in step 3, set the upper switching point with adjustment knob II.

5. If the desired upper and lower switching points cannot be reached, turn the setting spindle

S in

the appropriate direction and repeat steps 3 and 4.