Electrical Connections - Bühler technologies Pressotronik PT77 Guía Rápida

Pressotronik PT77
Pressotronik
Display and control unit with
offset transmitter, for top-hat
rail mounting 35 mm (1.4").
Plug
Jack
Plug
Spanner size SW21
DANGER
Electric voltage
Risk of electric shock
When connecting devices, please note the maximum voltages
and currents currents (see technical data) and use the correct
wire cross-sections and circuit breakers.
When selecting the connection lines, also note the maximum
operating temperatures of the devices.
Installation in special areas of application:
If the device will be installed outdoors or in wet areas, the
maximum operating voltage is max. 16 V DC effective or 35 V
DC.
4.1.1 Upside down pressure sensor installation
The Pressotronik 771 can also be installed rotated by 180°.
The hydraulic connection for the transmitter is carried out via
G¼ external thread, DIN 3852 shape E. Depending on the de-
sired position, the sensor can be mounted facing up or down.
Only use the spanner (SW 21) on the hexagon flat when
mounting. Avoid force being transmitted via the housing.
BX130003 ◦ 02/2021
Display and control unit with
built-in transmitter, for direct
mounting.
Plug
Spanner size
SW21
Pressotronik 771
Display and control unit with
built-in transmitter (upright)
Plug
Spanner size
SW21
Please note the following particularities when turning the
Pressotronik:
• The key order changes, the
( ) and is located on the left.
• The and keys remain the same.
• Even with it being at the top end of the numbers when
turning the display, the decimal point is a decimal place.

4.2 Electrical connections

A cable connects the sensor to a jack at the bottom of the
device. This cable also supplies the input signal for the sensor.
Electricity is supplied via plug connectors. Please refer to the
appendix for installation dimensions, nominal voltage and
plug configuration.
The temperature switching outputs are PNP transistors (see il-
lustration):
Supply voltage
Note: When measuring the switching output with high-load
measuring device inputs or when used as a frequency output,
the load must be set to 10 kΩ between the output and earth
(GND) to avoid faulty measurements.
5 Operation and control
NOTICE
The device must not be operated beyond its specifications.
Pressotronik 771
Display and control unit with
built-in transmitter (upside
down)
G1/4
Spanner size
SW21
Plug
key now points to the left
Bühler Technologies GmbH 9