Bronkhorst IN-FLOW User Manual download pdf (Page 25)

BRONKHORST HIGH-TECH B.V.

9.17.022

page 25

3 OPERATION

3.1 General

The Bronkhorst High-Tech B.V. instruments are designed in such a way that they will meet user process

requirements in the best possible way.

Basically all digital meters/controllers are powered with +15 Vdc to +24 Vdc.

When providing your own power supply be sure that voltage and current rating are according to the

specifications of the instrument(s) and furthermore that the source is capable of delivering enough energy to

the instrument(s).

Cable wire diameters should be sufficient to carry the supply current and voltage losses must be kept as low

as possible. When in doubt: consult factory.

Digital instruments can be operated by means of:

1. Analog interface (0...5Vdc/0...10Vdc/0...20mA/4...20mA)

2. RS232 interface (connected to COM-port by means of special cable)

3. FLOW-BUS

4. PROFIBUS-DP

5. DeviceNet

6. Modbus

7. EtherCAT

Option 1 and 2 are always present on multibus instruments. An interface to any available fieldbus is optional.

Operation via analog interface, RS232 interface and an optional fieldbus can be performed at the same time.

A special parameter called “control mode” indicates to which setpoint the controller should listen: analog or

digital (via fieldbus or RS232). The RS232 interface behaves like a FLOW-BUS interface.

When using more interfaces at the same time, reading can be done simultaneously without problems.

When changing a parameter value, the last value send by an interface will be valid.

Also the micro push-button switch and the LED’s on top of the instrument can be used for manual operation

of some options.

The green LED will indicate in what mode the instrument is active.

The red LED will indicate error/warning situations.

3.2 Power and warm-up

Before switching on power check if all connections have been made according to the hook-up diagram which

belongs to the instrument.

It is recommended to turn on power before applying pressure on the instrument and to switch off power after

removing pressure.

Check fluid connections and make sure there is no leakage. If needed purge the system with a proper fluid.

For a gas instrument only purging with gases is allowed. Liquid instruments may be purged with either a gas

or a liquid, whatever is needed for the purpose.

Turn on power and allow at least 30 minutes to warm up and stabilize. In cases where no electronics are

involved (valves only) warming up is not needed.

During warm-up period, fluid pressure may either be on or off.

3.3 Zeroing

In general the zero point of each instrument is factory adjusted. If so required the zero point of the instrument

may be re-adjusted.

After warm-up, with no gas flow, use the micro push-button switch on top of the instrument to start the

automatic zero adjustment procedure, if required.

For flow controllers setpoint must be zero. Be sure there is no gasflow.

For information how to start the automatic zero procedure by means of the micro push-button switch, see

manual operation, document number 9.17.023.

It is also possible to start the automatic zero adjustment procedure through the FLOW-BUS, using a E-7000

readout/control unit or a software program on a PC, connected to a FLOW-BUS interface module.

See the appropriate documentation for more detailed information.

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