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Conductivity sensor
8.2.2
Pressure monitoring devices as overpressure protection
8.2.3
Pressure relief valve with bypass
Fig. 12: Example: safety valve
170
If the temperature in the pump chamber rises to a preset value due
to a lack of pumped medium, the rotary lobe pump / system
equipped with a PT100 temperature sensor is switched off by
means of a control unit. This then prevents the rotary lobe pump
from running dry.
PT100 temperature sensors can also be used for temperature
monitoring of optional packings. For example, this is necessary
when such seals are used in potentially explosive atmospheres.
Conductivity sensors as level control indicators measure the elec-
trical conductivity on the pump inlet and switch the rotary lobe
pump / system off by means of a control unit when the value drops
beneath a specified limit.
Exceeding the maximum permissible working pressure can cause
lasting damage to parts of the Börger machine and all attachment
parts. There is also a risk of leakage and subsequent risks to per-
sonnel and the environment, depending on the medium.
Pressure monitoring devices of different manufacturers offer pro-
tection from damage due to overpressure. The Börger machine or
the system can thus be switched off when a preset pressure is
exceeded, or other measures for reducing the pressure can be
carried out.
By using a bypass with pressure relief valve (safety valve), it is
possible to close the pressure line completely for a short period
without switching off the pump.
While the pressure line is closed, the pump delivers the medium
back to the suction side through the opened pressure relief valve.
The causes of overpressure can now be rectified.
When the pressure decreases or the pressure line opens again,
the pressure relief valve closes and operation can be continued
without delay.
www.boerger.de / www.boerger.com
Accessories
BA-Classic FL_en-US, 03.05.2018
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