© 2018 Bronkhorst High-Tech B.V.
3
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
Mounting/installing
Install the instrument in the line in accordance with the flow arrow on the
instrument body. Tighten fittings according to the instructions of their
supplier. The use of Swagelok RS-type stainless steel adapters and
Bronkhorst® elastomer O-rings 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 system for leaks before applying (fluid) 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™)
7a
Analog/local operation
Connect the device to the power supply/readout unit using a cable with 9-pin D-sub connector. For controllers, the
setpoint is proportional to the flow range. This principle also applies to digital operation.
7b
Digital RS232 operation
Connecting the instrument with an RS232 cable to a Windows computer enables the use of the free Bronkhorst®
software for Windows, such as FlowDDE and FlowPlot.
Consult the
EL-FLOW®
manual (document no. 9.17.099) for further explanation on RS232 operation.
7c
Fieldbus operation
Connect the instrument according to the specific fieldbus standard. Refer to the appropriate fieldbus hook-up
document mentioned on page 2.