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1.3 Scope of application
Generalitie
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Explosion protected pressure switches of the HNSPX-Ex type series with
intrinsic safety « i » and b enclosures « t » control and monitor pressure process.
The pressure switches operate according to a deformable sensor (membrane or
valve). The variation of pressure leads to a deviation of the membrane (or valve)
which acts on a electrical contact.
In gas area the pressure switches HNSPX-Ex could be only fitted to equipment
certificated with intrinsic safety and could be used in explosive areas – Zone 0,
Zone 1 and Zone 2.
In dust area the ignition protection class "t" allows the use of device in Zone 20,
Zone 21, Zone 22
If this pressure transmitter is used in an explosive area, you must observe the
instructions on installation and operation of equipment in this type of area.
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Do not damage the sensitive elements (diaphragm or piston) of the pressure
switch!
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Do not use the device on a process fluid which could damage the pressure
switch. We would recommend you mount the device on a diaphragm seal if
available (Attention the filling liquid must be compatible with the process).
−
Execution with flush membrane (separator): Do not deform the membrane.
To touch the membrane with your fingers may be enough to cause damage.
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Do not insert different objects into the outlet pressure !
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The pressure of membrane must be uniform.
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The pressure to be measured must not exceed the permissible overpressure,
even when pressure spikes.
−
Spiking very high pressure can destroy the switch. Under these conditions,
we must take adequate precautionary measures (eg. Ride a damping
element).
−
Do not exceed the maximum permissible fluid temperature (+85 ° C) and, if
applicable, use a cooler.
Avoid mounting close to sources of heat or
excessive sunlight to minimize the effects of condensation nocturnal.
Avoid falls and the locations where the material can undergo mechanical shock.
7
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