KANT Druckschalter 902-2 User manual

INSTRUCTION MANUAL
Please keep these operating instructions.
PRESSURE SWITCH WITH CHANGE-OVER CONTACT
TYPE 902
Maybachstraße 18
72175 Dornhan
Tel [phone]
Fax [phone]
Email: [e-mail]
www.kant-druckschalter.de
Attention: All of the following warnings and notes must be considered.
SAFETY INSTRUCTIONS
These installation and operating instructions are intended for fitters and maintenance personnel as well as for designers who require the pressure
switch for an application. Please read the complete operating instructions carefully before commissioning and pay particular attention to the following
hazard warnings and notes.
Instructions for the safe use of the pressure switch:
Do not exceed any of the specified limits.
Remove all packaging before installation.
Extreme environmental conditions such as high temperatures, humidity, dirt etc. must be avoided at all costs. These can cause the pressure
switch to fail.
Do not use damaged installation elements and always ensure proper fastening.
Always make sure that the fastening screws are complete and ensure firm screwing.
The pressure switch must not be subjected to strong shocks.
The user must check whether the plug connection complies with the regulations of the specified degree of protection.
Switch off the pressure medium during assembly or repair work on the pressure switch.
Piston pressure switches are not suitable for gaseous media (oxygen etc.). When using oxygen with diaphragm pressure switches, all safety
regulations must be observed.
The overpressure protection refers to static load. Under dynamic load the value is reduced by at least 25%.
Always consider all safety instructions and warnings during installation and commissioning.
FUNCTION
A Kant Pressure Switch Type 802 has an integrated electric changeover switch. By applying a pressure, a diaphragm is deformed or a piston is
displaced by a lifting movement. The deformation or movement depends on an adjustable spring preload. When the switching point is reached, the
diaphragm or piston has undergone a defined movement, via which the switch is actuated and the electrical circuit is closed.
Caution: Failure to observe these instructions may result in injury.
Note: This document can be downloaded from our homepage www.Kant-Druckschalter.de
Only the documents currently available on the homepage are valid.

TECHNICAL DATA
Pressure switch with change-over contact
Dimensions 30 x 30 x 107
Connection G 1/4" or slab connection
Cylinder in AL or VA (1.4305) with BAM approval up to 200 bar also for slab connection.
Type = Ref. No.
902-2
902-10
902-20
902-50
902-100M
902-100
902-200
902-400
Range of adgjustment,
bar
0,2-2
1-10
2-20
5-50
10-100
10-100
20-200
40-400
Overpressure safety
100 bar
200 bar
600 bar
Sealing element
Diaphragm
Piston
Reproducibility
~2-5%
Hysteresis
~20-30%
Smaller upon request
Switching element
Change-over contact
Switching frequency
200/min
Voltage, max
250 Volt
Current, max
2 Amp.
Optional: 10 Amp.
Type of protection
IP 55
Temperature,
permissible
-20° bis +100°
Weight
0,38 kg
The functions breaking, making or changing relate to rising pressure.
DESIGN OF THE PRESSURE SWITCH
6
5
2
3
4
1
7
8

ASSEMBLY
Connect the pressure switch to the pressure connection (1) (observe maximum tightening torque). Use a suitable sealing ring for sealing.
Type 902-P
Insert the supplied O-ring into the connection hole (8) and fasten the pressure switch with the drilled holes (7) provided for this purpose using two
M5 screws.
For the electrical connection use the supplied cable plug.
Make sure that the cable is laid without kinks or squeezing.
Cabling of the cable plug:
Loosen the fastening screw (2) until the cable plug (5) can be removed.
Push the connecting plate out of the cable plug (5).
Connect the cables (max. conductor cross-section 1.5 mm2) to the screw terminals.
Slide the connecting plate into the plug housing (6) and mount it with the fastening screw (2).
Plug the cable plug (5) onto the pressure switch and mount and tighten the fastening screw (2).
Ensure that the strain relief is properly installed to ensure its function and degree of protection.
COMMISSIONING
Loosen the fastening screw (2) and remove the cable plug (5).
Wire the electrical connections according to the schematic diagram.
Loosen the lock nut (3). Turn the knurled screw (4) by hand as far as possible.
Apply the desired switching pressure to the pressure switch.
Unscrew the knurled screw (4) until the pressure switch switches and outputs the electrical signal.
Check the switching signal by switching the pressure on and off. Correct any error by adjusting the knurled screw (4).
When the adjustment is complete retighten the lock nut (3).
Attach the cable plug and fasten by tightening the fastening screw (2).
When commissioning the pressure switch, please observe the relevant safety regulations of the employers' liability insurance association or the
respective national regulations.
DISASSEMBLY
Follow these instructions when removing the pressure switch:
The pressure switch must be in a pressureless and deenergised state.
Use a suitable tool to disassemble the pressure switch on the provided wrench surfaces or hexagonal profiles.
Damage may occur if other surfaces or unsuitable tools are used.
Always observe all relevant safety regulations.
NOTE
The data and descriptions in this manual have been compiled to the best of our knowledge. However, the manufacturer cannot be held liable for
errors. In any case, the operator must ensure that a failure or defect of the product cannot lead to further damage.
Caution: Tighten the pressure switch only on the metal housing - risk of damage!
Caution: Observe the permissible electrical switching capacity - risk of damage!