Bronkhorst EL-FLOW Prestige - Manual (Page 9)

Bronkhorst High-Tech B.V.
EL-FLOW Prestige 9 9.17.084
2 Starting up
2.1 Check functional properties
Before installing your EL-FLOW Prestige mass flow meter/controller it is important to
read the label on the backside of the instrument and check:
Flow rate
Fluid to be measured
Up- and downstream pressures
Temperature
Valve type (N.C.= Normally Closed, N.O.= Normally Opened)
Input/output signal (see also section 2.6)
2.2 Check operating conditions
2.2.1 Rated pressure test inspection
Each EL-FLOW Prestige instrument is pressure tested to at least 1.5 times the maximum operating pressure of the instrument. Each
instrument is helium leak tested to at least 2x10 -9 mbar l/s Helium outboard.
The tested pressure is stated on the instrument with a red-colored sticker.
Before installation, make sure that the test pressure is in accordance with
normal safety factors for your application. If there is no Pressure Testing
Sticker on the device or if the test pressure is incorrect, the instrument
should not be mounted in the process line and be returned to the factory.
2.2.2 Sealings
EL-FLOW Prestige instruments are equipped from factory with sealings compatible with the requested gas type. However the
instruments have multi-gas/multi-range functionality on board. If another gas or mixture is used, always make sure that the gas/
mixture is compatible with the installed sealing materials. Refer to section 4.1 for a compatibility list.
2.2.3 Environmental ratings
EL-FLOW Prestige instruments are suitable for use in conditions between -10…70 °C and relative humidity of 10…90 %RH, unless
specified otherwise. Please note that EL-FLOW Prestige instruments have an ingress protection of IP-40, implying that the
electronics housing and electrical connection do not offer any protection against moist environments.
Make sure that process gases do not condensate in the instrument due to (changing) environmental conditions,
condensed process fluids may seriously harm the instrument's functionality! E.g. do not use moist air as process gas
at low temperatures.
2.3 Piping requirements
For reliable measurement always make sure the fluid stream is clean. Use
filters to assure a moisture-, oil- and particle free gas stream. Recommended
pore-size: 5 µm. If back flow can occur, a downstream filter and a check valve
are recommended too. For high flow rates select a suitable filter size, to avoid
too high pressure drop.
Do not install small diameter piping on high flow rates, because the inlet jet flow may affect the accuracy
Do not mount abrupt angles directly on in- and outlet, especially not on high flow rates. At least 10 pipe diameters