© 2020 Bronkhorst High-Tech B.V.
3
b. Check operating conditions
EL-FLOW®
instruments are suitable for use at temperatures between -10 and +70 °C. The instrument housing has
ingress protection rating IP40, implying that the equipment is suited for general purpose indoor (dry) applications,
like laboratories and machine enclosures.
3
Check if system piping is clean
For reliable operation, always make sure the fluid stream is clean.
Use filters to ensure a moisture, oil and particle free gas stream
(recommended pore-size: 5 µm).
If back flow can occur, the use of a downstream filter and a check valve is
also recommended. Select a suitable filter size, to avoid a too high pressure
drop.
4
Install fluid connections
Mount the instrument in the line in accordance with the flow arrow on the
instrument body. Tighten the fluid connections according to the
instructions of the supplier of the fittings. The use of Swagelok® RS-type
stainless steel adapters is recommended.
Mounting the instrument in the upright position is preferred, especially if the operating pressure will be higher than
10 bar. When mounting the instrument in a position with upward or downward flow, adjusting the zero point is
advised (see step 10).
Avoid installation in close proximity of mechanic vibration and/or heat sources.
5
Leak check
Check the fluid system for leaks before applying pressure, especially if toxic, explosive or other dangerous fluids
are used.
6
Electrical connection
Electrical connections must be made with standard cables or according to the applicable hook-up diagram (see
page 2): EL-FLOW® Select instruments are powered with +15…24 Vdc.
A. Analog connection
B. Digital RS232 connection powered by plug in
power supply
C. Fieldbus (e.g. DeviceNet™)
