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Installing/Mounting
4.1 Flowmeter installation
4.1.5
Hydrostatic testing
The flowmeter is pressure-tested before delivery to 1.5 times the rated working pressure of
the sensor.
● In the case of process connections pressure-rated less than 100 bar, the connection is
the limiting component.
● In the cases of stainless steel sensors with process connections pressure-rated above
100 bar, the sensor is the limiting component.
In all cases the maximum allowed hydrostatic test pressure (MATP) of the flowmeter is 1.5
times the marked MAWP (PS) at 20 °C.
Risk of equipment damage
Never pressure test a completed flow system with piping and other components at
pressures higher than 1.5 times the marked MAWP (PS) at 20 °C of the lowest rated
component in the system.
4.1.6
Mounting a pressure guard
The sensor enclosure is supplied with two G½" (parallel thread) purge ports. These ports can
for example be used for a pressure guard, which can be connected to an automatic shut off
valve to stop the flow in case of sensor pipe fracture.
Note
Non-hazardous locations only
A pressure guard can be applied only in non-hazardous locations.
Note
Avoid opening purge ports
Opening either of the purge ports will void any Ex rating for the sensor.
The AISI 304 / EN 1.4301 exterior enclosure is rated to approximately 20 bar static pressure
to contain spilt process media in the event of a tube break. However it is not intended to
contain high pressure or corrosive fluids and precautions must be taken in applications
where vibrating tube failure is probable and may cause damage.
Pressure guard selection
Siemens does not supply the components of the pressure guard solution because the
arrangement and components are closely related to individual safety and protection
practices in each place.
34
WARNING
Operating Instructions, 02/2016, A5E33120874-AC
FC410 with Modbus
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