PSR/PSE
PSR/PSE K17/0618 page 5
5.Operating Principle
The KOBOLD flow monitors of series PSE and PSR are used
where economical, reliable flow monitors are indicated.
Depending on the flow velocity respectively flow rate, the baffle
plate is deflected and moves the permanent magnet via the
balance arm into the switching range of the reed contact
mounted outside of the flow media.
The flat spring, which also serves as a support for the balance
arm, forces the baffle plate back to its rest position when there
is no flow. KOBOLD baffle plate flow monitors are supplied
completely assembled with fitting up to nominal size 40, or for
larger nominal pipe sizes - supplied without a pipe length for
direct insertion into standard T pieces or fittings. The sealing
takes place via PTFE tape.
6.Use in Hazardous Areas (PSx-2)
6.1. General
The paddle flow switch, being a mechanical component, has no inherent potential
ignition source. The mounted contact is suitable for usage in Ex-zone IIC and I as
an intrinsically safe component.
The measurement units can be used as follows:
In the Zone 0 (Gas-Ex, Cat. 1G) into explosion-group of IIA, IIB and IIC
In the Zone 20 (Dust-Ex, Cat. 1D)
In the Zone 2 (Gas-Ex, Cat. 3G) into explosion group of IIA, IIB and IIC
In the Zone 22 (Dust-Ex, Category 3D)
In the Zone 1 (Gas-Ex, Cat. 2G) into explosion group of IIA, IIB and IIC
In the Zone 21 (Dust-Ex, Category 2D)
In hazardous areas 1 and 2 in underground mining (category M1 and M2)
Regulation usage does not cause any zone inside the fitting or at paddle.
Exceptions are possible during start-up and shut-down of the plant.
