BRONKHORST CORI-TECH B.V.
2.5 Notes for temperature changes
The CORI-FLOW has to be installed in such a way that levels of different temperature within the CORI-
FLOW are avoided. Avoid multiple heating and cooling of the instrument.
When cleaning, temperature shocks have to be avoided in any case. (max. 1°C/sec)
The temperature difference between sensor and fluid should not exceed 50°C.
After using the CORI-FLOW the first time at low temperature tighten the connector screws again in order to
prevent any leakage!
Please note: if you do not tighten the screws, the leaking connector / fitting can cause damage!
After the first shrinking and tightening of the screws, no further precaution is necessary.
2.6 Fluid/gas connections
Bronkhorst Cori-Tech B.V. CORI-FLOW meters/controllers are equipped with compression or face-seal-
fittings. For CORI-FLOW these fittings are orbitally welded to the body. For leak tight installation of
compression type fittings be sure that the tube is inserted to the shoulder in the fitting body and that no dirt or
dust is present on tube, ferrules or fittings. Tighten the nut finger-tight; while holding the instrument, then
tighten the nut 1 turn.
If applicable follow the guidelines of the supplier of the fittings. Special types of fittings are available on
request.
* Note:
Always check your system for leaks, before applying fluid/gas pressure. Especially if toxic, explosive
or other dangerous fluids are used.
2.7 Piping
BE SURE THAT PIPING IS ABSOLUTELY CLEAN!
DO NOT
install small diameter piping on high flowrates, because the inlet jet-flow will affect the accuracy.
DO NOT
mount abrupt angles direct on in- and outlet, especially not with high flowrates. We recommend at
least 20 pipe diameters distance between the angle and the instrument.
Special care should be taken in regard to reducers placed just in front of the CORI-FLOW. High pressure
drop and flow disturbance can occur which can influence the CORI-FLOW.
2.8 Electrical connections
Bronkhorst Cori-Tech B.V. recommends using their standard cables. These cables have the right connectors
and if loose ends are used, these will be marked to prevent wrong connection.
2.9 Pressure testing
Each CORI-FLOW is pressure tested to at least 1.5 times the working pressure of the process
conditions stipulated by the customer, with a minimum of 8 bar.
The tested pressure is stated on the flow meter/controller with a RED COLOURED sticker. Check test
pressure before installing in the line.
If the sticker is
not
available or the test pressure is incorrect, the instrument should
not
be mounted in the
process line and be returned to the factory.
Each instrument is helium leak tested to at least 2
⋅
10
-9
mbar l/s Helium.
2.10 Supply pressure
Do not apply pressure until electrical connections are made. When applying pressure to the system, take
care to avoid pressure shocks in the system and increase pressure gradually, especially on high pressure
units incorporating a piston operated control valve.
Make sure in case of a controller that the used valve can withstand the system pressure.
page 14
9.17.031
