Pressotronik PT77
1 Introduction
This quick guide will assist you in starting up the unit. Follow
the safety notices or injury to health or property damage may
occur. Carefully read the original operating instructions in-
cluding information on maintenance and troubleshooting
prior to startup. These are located on the included CD and on-
line at
Please direct any questions to:
Bühler Technologies GmbH
Harkortstraße 29
40880 Ratingen
Germany
Tel.: +49 (0) 21 02 / 49 89-0
Fax: +49 (0) 21 02 / 49 89-20
These operating instructions are a part of the equipment. The
manufacturer reserves the right to change performance-, spe-
cification- or technical data without prior notice. Please keep
these instructions for future reference.
1.1 Intended Use
These devices are pressure sensors or pressure switches for in-
dicating and controlling the pressure in fluid systems.
Please note the technical data for the specific intended use,
existing material combinations, as well as the pressure and
temperature limits. Please refer to the original operating in-
structions on the included CD for details.
WARNING
All device models are solely intended for industrial applica-
tions. They are not safety components. The devices must not
be used if failure or malfunction thereof jeopardises the
safety and health of persons.
Use in explosive areas is prohibited.
1.2 Contents
• Pressotronik
• Product documentation
• Connection/mounting accessories (optional)
2 Safety instructions
The equipment must be installed by a professional familiar
with the safety requirements and risks.
Be sure to observe the safety regulations and generally applic-
able rules of technology relevant for the installation site. Pre-
vent malfunctions and avoid personal injuries and property
damage.
The operator of the system must ensure:
• Safety notices and operating instructions are available
and observed,
• The respective national accident prevention regulations
are observed,
• The permissible data and operational conditions are
maintained,
• Safety guards are used and mandatory maintenance is
performed,
• Legal regulations are observed during disposal,
• compliance with national installation regulations.
3 Transport and storage
Only transport the product inside the original packaging or a
suitable alternative.
The equipment must be protected from moisture and heat
when not in use. It must be stored in a covered, dry, dust-free
room at room temperature.
4 Setup and connection
DANGER
Electric voltage
Risk of electric shock
a) Always disconnect the unit from the mains before per-
forming work.
b) Secure the equipment from accidental restarting.
c) The equipment may only be installed, maintained and
put into operation by instructed, competent personnel.
d) Always observe the applicable safety regulations for the
operating site.
DANGER
Toxic, acidic gases/liquids
Protect yourself from toxic, corrosive gasses/liquids when
performing any type of work. Wear appropriate protective
equipment.
4.1 Installation
WARNING
Gases or liquids discharged under pressure
Depressurise the system before installing or removing the
transmitter.
The Pressotronik housing mounts to a 35 mm (1.4") top-hat
rail. This allows it to easily be mounted in a central location
without additional mounting aids or installed in control cab-
inets. The hydraulic connection for the transmitter is carried
out via G¼ external thread, DIN 3852 shape E. The transmitter
connects to the display and control unit via cable with M12
plug-in connector.
When direct mounting the (display and control unit with
transmitter), the unit screws into the transmitter. Only use
the spanner (SW 21) on the hexagon flat. Avoid force being
transmitted via the housing.
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Bühler Technologies GmbH
BX130003 ◦ 02/2021
