MSB780(X) - User’s Guide
2 Hardware
2.1 Principle of operation
Sensor measurement principle is based on an oscillating tube, where frequency of oscillation
is dependent on density of the air inside. The oscillating tube is placed in vacuum. Measured
pressure comes inside the tube. Coil magnetic transducers are used to establish oscillation and
also to pick-up the signal.
The principle of measuring density of a gas counts on gas fractures of air. Using other gas as
pressure media would give incorrect pressure reading.
Note: Air must be used as a pressure medium during calibration.
2.2 Terminals
The terminals for connecting of wires are placed inside the device – unscrew 4 screws and
remove the cover to access the terminals.
The description of MSB780 terminals is in the figure 1. Description of MSB780X terminals is in
the figure 2.
If you have the MSB780X version with display, after opening the lid with display, disconnect the
display flat cable from the display connector on the mainboard. Before closing the lid, reconnect
the flat cable to the connector again, otherwise the display will not operate.
2.3 Power supply
The device is supplied by direct current, typically 12 V, or 24 V. Power supply terminals are
marked PWR+ and GND on the mainboard. For voltage range and typical power supply con-
sumption please see Technical Data on page 84.
2.4 Power consumption - model with touchscreen display
For models with touchscreen display option the overall power consumption may be reduced by
settings "Backlight off" time (Main menu - Display). In order to keep the data on display up to
date, the barometer measures continuously whenever the display is on, therefore consumes
more power. To conserve power at battery powered installations, set the Backlight off time to
the lowest possible value, for example 15 s.
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