SCH
page 4 SCH K03/0320
4.1 Installation and Commissioning
Pressure switches must be installed only by personnel trained in this
application area (electric/hydraulic/mechanical) in accordance with the
installation instructions and local legal requirements.
The devices must be installed (mechanical, pressure-side connection) only
on electro-chemically matched materials, otherwise there is risk of damage
to base metals through contact corrosion which can result in loss of
stability and leakage.
Caution when touching device – risk of burns. Device can reach a medium
temperature of up to 70 °C. Risk of freezing when working with media up
to -20 °C.
Do not open wiring-box or plug and do not remove terminal screws before
the device is de-energized.
Ex versions are limited to an operating range of -20 … +60 °C.
4.2 Safety Instructions
The device must only be used within the electric, hydraulic and thermal
limits specified in the data sheet.
Inductive loads can cause contact burns or fuse the contacts. Preventative
measures must be implemented by the customer, e.g., through use of
suitable RC elements.
When using the version with ZF 1979 (oil and grease-free), take care to
avoid recontamination of surfaces that are in contact with media, right
through from opening the packaging to completed installation. Generally,
no liability will be assumed for oil and grease-free version.
High quality stainless-steel sensor parts in contact with media enable the
devices to be used with a variety of media. However, a chemical
resistance test MUST be carried out before selection.
Use with acids and other aggressive media, such as hydrofluoric acid,
copper chloride, aqua regia or hydrogen peroxide, is not permitted.
Use in systems with unstable gases and liquids such as hydrogen cyanide,
dissolved acetylene or NOx is not permitted.
Devices must be protected from solar radiation and rain.
Pressure switches are precision devices which are calibrated in the
factory. For this reason, never open the device and do not change the
adjustment of the varnished calibration screws.
Prevent excessive vibrations from reaching the pressure switch, e.g., with
mechanical isolation or other vibration damping measures.
Heavily contaminated media can clog the sensor and cause errors and/or
malfunction. If the equipment is to be used for this purpose, suitable
chemical seals must be connected.
Pressure switches and chemical seals form a functional unit and must not
be disconnected from each other in the field.
Before disassembly (removing the pressure switch from the system), the
device must be disconnected from the power supply and the system must
be emptied. Observe the Accident Prevention Regulations.
Never use the pressure switches as a climbing aid.
KOBOLD Messring GmbH accepts no liability for non-compliance.
