BRONKHORST FLEXI-FLOW Compact Instruction Manual page 17

3 Operation
3.1 General procedures
Before operating the FLEXI-FLOW, make sure that the equipment has been installed and configured by an authorized
engineer and that the installation is approved for use.
To ensure and maintain a safe working area, regularly inspect electrical and fluid lines and connections:
Prior to each use, check cabling for proper connection, damage and wear. If necessary, replace cables and/or
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connectors.
· Before, during and after operation, check fluid lines and connections for leaks, damage and wear. If necessary, re-
tighten or replace fluid connectors.
During operation, fluid connections must not be loosened or disconnected under any circumstances.
Gas condensation in the instrument can seriously affect its performance and reliability.
If possible, ensure that the ambient temperature is stable and at equal to or slightly higher than the process gas
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temperature.
Always use a clean and dry process gas (preferably with a purity of at least 99.5 %).
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3.1.1 Powering up
To maintain control of the fluid system and ensure a safe situation, it is recommended to turn on power before
applying fluid pressure and to switch off power only after the fluid system is depressurized.
When pressurizing, prevent pressure shocks by gradually bringing the fluid system to the required operating
pressure.
When powering up, the instrument needs a couple of seconds to start up the electronics and perform a self-test.
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· During initialization, the status LED cycles through all
· After successful initialization, the status LED lights up green to indicate that the instrument is ready to be used.
After powering up, the control valve will act according to the last known setpoint. When setpoint is 0, this means the
valve closes (normally open) or stays closed (normally closed). The valve stays closed until the instrument receives a
new valid setpoint from the active setpoint source.
3.1.2 First use
Bronkhorst does the utmost to ensure that you receive a clean product. This does not, however, relieve the user of the
responsibility to ensure that the equipment and the system in which it is incorporated meet the requirements implied
by the intended use of the product. The responsibility for cleaning the equipment to meet such requirements lies
exclusively with the user.
3.1.3 After use
· Depending on the properties of the process medium and the (expected) time until the next use, it is advisable to
flush the fluid system with a suitable (cleaning) fluid after use.
· If the equipment has been used to process corrosive, reactive or hazardous media (e.g. toxic or flammable),
cleaning the fluid system is imperative before it is exposed to air.
If the equipment is not used for an extended period, the fluid system should be dry after use and after cleaning. If it
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is not dry, it should be purged with a dry, inert gas for a minimum period of 30 minutes.
3.1.4 Powering down
· Prior to powering down the FLEXI-FLOW, the fluid system should be depressurized.
· When depressurizing, prevent pressure shocks by shutting off the fluid supply gradually.
9.17.158G
Bronkhorst®
NAMUR status colors
Instruction Manual FLEXI-FLOW™ Compact
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