Page 12 EL-FLOW Base Series Mass Flow Controllers 9.17.061
mounting an instrument other than horizontal, zeroing of the instrument is advised. The zeroing
procedure is described in chapter 2.12.
Avoid installation in close proximity of mechanic vibration and/or heat sources.
2.5 Fluidic connections
The fluid connections of EL-FLOW Base instruments consist of ¼” BSPP female thread. The adapter
chambers are optimised for the use of Swagelok RS-type adapters combined with AS013 (70°Sh) o-rings
for leak tight installation.
Bronkhorst® highly recommends the use of Swagelok RS-type stainless steel adapters, e.g. part number
SS-400-1-4RS.
Adapters can be ordered separately to the instruments. Contact your local distributor for more
information.
Always check your system for leaks, before applying fluid pressure. Especially if toxic, explosive or other
dangerous fluids are used.
2.6 In-line filter usage
Fluids to be measured should be absolutely free of dirt, oil, moisture and other particles. Fluids that are
heavily contaminated or contain particulates are detrimental to precision. If liquid phases enter the
sensor chamber, the function of the sensor and the mass flow controller may be impaired.
It is recommended to install an in-line filter or liquid separator upstream of the flow controller, and if
backflow can occur, a downstream filter is recommended too. Be aware of the pressure drop caused by
the filter.
Contact your distributor for further information.
2.7 Piping requirements
Be sure that piping is absolutely clean!
DO NOT install small diameter piping on high flow rates, because the inlet jet flow will affect the
accuracy.
DO NOT mount abrupt angles direct on in- and outlet, especially not on high flow rates. At least 10 pipe
diameters distance between the angle and the instrument is recommended.
DO NOT mount pressure regulators direct on the inlet of gas flow meters/controllers, but allow some
meters of piping (at least 25 pipe diameters).
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