Bronkhorst®
Instruction Manual EL-FLOW® Select9.17.099F 13
2
Installation
2.1 Functional properties
Before installing the EL-FLOW® Select, check the serial number label to see if the functional
properties match your requirements:
· Flow rate
· Media to be used in the instrument
· Upstream and downstream pressure(s)
· Operating temperature
· Valve type (N.C. - Normally Closed / N.O. - Normally Open)
· Input and output signal
2.2 Operating conditions
Bronkhorst® instruments are pressure tested to at least 1.5 times the specified operating pressure and
outboard leak tested to at least 2 * 10
-9
mbar l/s Helium.
The operating pressure must never exceed the test pressure.
· The test pressure is specified on the device with a red label; if this label is missing or if the test pressure is insufficient, the
device must not be used and should be returned to the factory.
· Before installation, make sure that the test pressure is in accordance with the safety factor of your application.
· Disassembling the device and/or replacing parts will invalidate the test pressure and leak test specification.
Rapid gas decompression / explosive decompression
For instruments used above 10 barg:
Bronkhorst recommends a maximum decompression rate of 70 bar/min, according NACE TM0297.
Exceeding this rate can have negative influence on the lifetime of the sealing materials.
Make sure that process gases do not condensate in the instrument due to (changing) ambient conditions, as this may
seriously harm the instrument's functionality! Do not use moist air as process gas at low temperatures.
2.3 Mounting
For optimal performance, observe the following guidelines:
· Preferably, mount the EL-FLOW® Select in an upright position, especially if the operating pressure is higher than 10 bar.
· If the instrument is mounted in a position where the flow is directed upwards or downwards, adjusting the zero point is
recommended.
· Avoid installation in close proximity of mechanical vibration and/or heat sources.
For stable fixation, the bottom of the instrument base is fitted with threaded mounting holes. Consult the dimensional
drawing for the exact size and locations.
2.4 Piping requirements
For reliable performance, make sure the fluid stream is uncontaminated. If necessary, use filters to ensure a moisture, oil
and particle free gas stream. If back flow can occur, the use of a downstream filter and check valve is also recommended.
Select a suitable filter size, to prevent a too high pressure drop.
· Use piping or tubing that is suitable for the operating conditions of the application (media, maximum temperature,
maximum operating pressure).
· Do not install small diameter piping/tubing on high flow rates and avoid abrupt angles or other disturbances within a
distance of 10 times the (inside) pipe diameter from the inlet or outlet of the device.
· Do not install pressure regulators within a distance of 25 times the (inside) pipe diameter.
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