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Pressure switches

Hydro-electric signal converters for hydraulic oil

pressure switches with continuously adjustable switching point

electronic pressure sensors with radio transmission

ports: G1/4 or O-ring
code class: IP 65 /67
max. operating pressure: 600 bar

Series Data sheet Technical data
F9.732 Pressure switches


hydro-electric signal converter

pressure range 5-130 bar

50-350 bar and 50-550 bar

ports: G1/4 or O-ring
max. operating pressure: 600 bar
electrical connection: plug DIN 43650, form A
max. load: 4.0 A at 250 VAC/3.0 A at 28 VDC
hysteresis: 8 ...12 %
code class: IP 65

F9.733 Pressure Switches


hydraulic-electronic signal converter

2 switching outputs

max. operating pressure 250 and 600 bar

two PNP transistor switching outputs
four-digit digital display
supply voltage: 10…32 VDC
hydraulic connection: G1/4
code class: IP 67

F9.750 Electronic pressure sensor with radio transmission


Receiver unit with analogue and digital interface

measuring range 0... 16 / 0... 250 / 0... 600 bar

Battery-powered pressure sensor with radio transmission
long-field range: max. 300 m
code class: IP67
Receiver unit with antenna
voltage: 20..30 VDC
outputs: 4x analog or 2x analog + 2 relay
data interface: RS485 Modbus

figure 1: hydro-electric pressure switch for hydraulic oil

figure 2: Pressure Switches F9.733

figure 3: electronic pressure sensor F9.750
figure 4: stationary receiver unit F9.750

Pressure switches F9.732 (figure 1)

Hydro-electric pressure switches are devices, which close or open electrical contacts under pressure. They are used to switch on or off pump motors, valves for unpressurised cycles, for pressure-dependent machine tool interlock or similar applications in power units, machines and installations.

Hydro-electric pressure switches in piston design convert the pressure in hydraulic systems into electrical signals. The switching point can be continuously adjusted and locked by means of an adjusting knob within different adjusting ranges.
The installed micro switch is a change-over switch which can be connected as break or make contact. The electrical connection can be rotated by 4 x 90° with the housing. The pressure switches are designed for industrial use with normal environmental conditions for installations with a maximum system pressure of up to 600 bar.

Pressure Switches F9.733  (figure 2) 

Easily adjustable electronic pressure switch in compact design with two wear-resistant transistor switching outputs.
The switching points are set via two push-buttons using the four-digit digital pressure display. A green or red backlight indicates the switching positions of the two outputs. For optimum adaptation to the respective application, the device offers additional setting parameters, e.g. switching delay times and break/make function of the outputs.

Electronic pressure sensor with radio transmission F9.750 (figure 3-4)

Electronic pressure sensors with radio transmission will be used to monitor hydraulic clamping fixtures, if
• hard wired connections are not possible or too expensive.
• the pressure has to be measured in hard-to-reach points or has to be adjusted frequently.
• the pressure has to be measured continuously in several places at the same time.
• the pressure has to be checked during start up and maintenance with minimum installation costs.

Up to 16 pressure sensors can be individually configured and monitored at a stationary receiver unit with antenna.

The electronic pressure sensor (figure 2) operates according to the DMS principle. The measured values are sent in the ISM band to the stationary receiver unit. The range is max. 300 m in the free field. The replaceable lithium battery has a service life up to one year. The state of charge is constantly monitored.
The receiver unit can be configured with the keyboard and the two-line LCD-display. With the optionally available setup program on a PC or laptop that can be connected with a USB cable it is even more flexible.
A laptop with the loaded setup program can be directly connected to the pressure sensor by means of a mini-USB cable. Thus, a temporary pressure measurement is also possible without receiver unit, e.g. during start up and maintenance.
The receiver unit has four freely configurable analog outputs (optionally two relay outputs) and a RS485 interface with Modbus protocol.
Available as an accessory is a Profibus gateway that translates the Modbus protocol into a PROFIBUS protocol with GSD.

Important notes
The electronic pressure sensor is intended for industrial use, but is not suitable for safety-critical applications.
Metallic objects in the immediate vicinity of the transmitter or concrete ceilings and walls reduce the range. The minimum distance between two transmitters shall be 200 mm.
During installation and operation of the electronic pressure sensor, electrostatic charging must not arise. Electrical or magnetic fields, e.g. by transformers and two-way radios are to be avoided.


Seal kits
for hydraulic elements

data sheet S0.001

Accessories for pressure switches F9.732

Connecting plate
for manifold-mounting connection
data sheet F9.732

Plug with or without cable
for electrical connection
data sheet F9.732

Accessories for pressure sensors F9.750

  • Antenna cable, length 3 m
  • Antenna cable, length 5 m
  • Antenna wall holder
  • Profibus gateway
  • USB / TTL converter
  • Setup program on CD-ROM
  • Lithium battery

data sheet F9.750

figure 1: electronic pressure sensor in use

Application example 1 (figure 1)
Electronic pressure sensor with radio transmission F9.750