Piping Requirements; Fluid Connection; Preventing Pressure Shocks; Electrical Connection - BRONKHORST FLEXI-FLOW Compact Instruction Manual

2.2.1

Piping requirements

·
For reliable performance, make sure the fluid stream is uncontaminated. If necessary, use an inlet filter to ensure a
particle free media stream. Select a filter with a maximum pore size of 20 µm and a surface area that minimizes the
pressure drop.
·
If back flow could occur, the use of a check valve is also recommended.
Use piping or tubing that is suitable for the operating conditions of the application (media, maximum temperature,
maximum operating pressure).
2.2.2

Fluid connection

·
If applicable: install the fluid connections according to the manufacturer's instructions.
·
Connect the FLEXI-FLOW™ to the fluid system in accordance with the
·
Tighten fluid connections according to the instructions of the manufacturer of the fittings.
·
Make sure connector sizes match; do not mix metric (mm) and imperial (inch) sizes.
·
Make sure all connectors and tubing are free from dirt and debris.
Do not apply fluid pressure until all required fluid connections and electrical connections have been made.
Check the fluid system for leak tightness after any modification and before applying full operating pressure, especially when
using hazardous media (e.g. toxic or flammable).
2.2.3

Preventing pressure shocks

FLEXI-FLOW™ instruments can handle pressure shocks in the system well, but are not insensitive to pressure fluctuations.
For optimal control stability, observe the following guidelines:
·
Provide a stable (pressure controlled) upstream pressure; put sufficient buffer volume between a pressure regulator and
the instrument. As a rule of thumb, install pressure regulators at a distance of at least 25 times the pipe diameter from
the inlet or outlet of the instrument.
·
When using multiple instruments and/or control valves, prevent interference by putting piping with sufficient buffer
volume between components.
2.3

Electrical connection

·
Electrical connections should be made according to the
included) or compatible, with respect to required supply current, voltage loss, cable length, cable and gland diameters
and operating conditions.
·
When using self-assembled cables, follow the guidelines provided by the connectors' manufacturer.
·
For use in a fieldbus system, follow the instructions of the cable supplier for the according fieldbus system.
·
Make sure that the power supply matches the power rating of the instrument (see
double or reinforced insulation is used for the power supply.
·
If a surge protection device is used, make sure its specifications match the power consumption of the application.
To prevent damage as a result of reversed polarity, the use of a 2A fuse in the direct +Us line is recommended.
Always turn off electrical power before connecting or disconnecting equipment electrically.
In order to be able to comply with all applicable guidelines and regulations, it is essential that electrical connections be
made by or under supervision of a qualified electrician.
·
The equipment described in this document contains electronic components that are susceptible to electrostatic
discharge.
·
When working on the electrical installation, take appropriate measures to prevent damage as a result of electrostatic
discharge.
12
Bronkhorst®
hook-up diagram
Instruction Manual FLEXI-FLOW™ Compact
7
product overview .
9
, using the supplied cables (insofar as
technical specifications
9
) and that
9.17.158D