Use in Hazardous Locations
Pressure switches with T-housing are marked as Ex i intrinsically safe. This switch must be
operated with a certified switch amplifier .
The wiring between switch and Ex i isolation amplifier must meet the local safety
requirements.
The customer must provide for a highly conductive connection between switch and
grounding.
With option Ex i: The models having light-alloy (aluminium) enclosures or enclosure parts
must be protected against all impact or friction which can ignite the explosive atmosphere.
Fig. 6: Operation of pressure switches in intrinsically safe areas
6 Maintenance/Cleaning
Maintenance
The pressure switch is maintenance free, however, the country specific test intervals for
preventive maintenance in plants, the PED guideline are to be carried out at all times.
Checking the set points lies within the discretion of the user.
Small setpoint drifts may occur during the initial use of the switch (run-in period). To
minimize the setpoint drift we can perform a run-in (ageing) process in our works on
request. Larger or continuing setpoints drifts during the normal use of the switch may
indicate that the measuring system is not used correctly within the specified limits,
exceeding the design criteria or is worn-out. This might lead to metal fatigue of the
measuring system and it therefore should be replaced before an ultimate rupture of the
metal diaphragm might take place. Please consult your supplier or Barksdale directly for
guidelines.
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