Bronkhorst®
Instruction Manual MI Series Industrial mini CORI-FLOW™
9.17.120A
10
2
Installation
2.1
Functional properties
Before installing the mini CORI-FLOW™, check the serial number label to see if the main functional
properties match your requirements:
·
Flow/pressure rate(s)
·
Media to be used in the instrument
·
Upstream and downstream pressure(s)
·
Operating temperature
·
Technical properties (see
Do not hesitate to contact your Bronkhorst representative if properties and ordering details do not
match.
2.2
Operating conditions
Test pressure
Bronkhorst® instruments are pressure tested to at least 1.5 times the specified working process
conditions and outboard leak tested to at least 2 * 10
-9
mbar l/s Helium. The tested pressure is specified
on the instrument with a red label.
·
Before installation, make sure that the tested pressure is in accordance with the safety factor of your application.
·
If the pressure test label is missing or if the specified pressure is insufficient, the instrument must not be used and should
be returned to the factory.
·
The maximum operating pressure must never exceed the tested pressure.
·
Disassembling the instrument and/or replacing parts of it will invalidate the pressure test specification.
Preventing slug flow
Adequate mass flow measurement is only possible if the fluid flows through the instrument in a single state (either gas or
liquid). To prevent so called 'slug flow' (two-phase flow), avoid the following circumstances:
·
external heating or cooling (can cause gas bubbles in liquid or condensation of gas)
·
extreme pressure fluctuations (can cause cavitation in liquid or condensation of gas)
Operation in high humidity conditions
In a relatively moist environment, water condensate may precipitate on the measuring tube if the media temperature is
(much) lower than the ambient temperature. Condensed water increases the tube's mass, causing a density measurement
error. To prevent this, continuous purging of the housing interior with a dry, inert gas (i.e. Nitrogen) is recommended.
Contact your Bronkhorst representative for setting up an optimal purging configuration.
2.3
Mounting
For optimal performance, installation in a vibration free position is
essential. The bottom of the instrument body is fitted with two sets of 4
mounting holes; use these mounting holes to fixate the instrument to a
firm, rigid base or heavy, vibration free mass, such as a wall, a heavy rig or
another stable construction. If such a facility is not available, Bronkhorst
can supply special suspension pads for stable, vibration free fixation.
These suspension pads are for upright mounting of the mini CORI-FLOW™
only and can be installed in the outer mounting holes. Contact your local
Bronkhorst representative for more information.
·
Always use the mounting holes to fixate the instrument. Consult the
for the exact locations and
size of the mounting holes.
·
Also make sure that the instrument is not suspended by the piping and take adequate measures to isolate the instrument
from vibrations in the piping.
2.3.1
Orientation
Generally, the reliability of a mini CORI-FLOW™ instrument is not affected by the mounting orientation.
