BRONKHORST FLEXI-FLOW Compact Instruction Manual page 22

Switching the control function
· Use parameter Control Function
· Give a setpoint to the controlled value.
If dual channel control is selected: give a limit to the limited value, using the setpoint parameter of that communication
·
channel.
· See section Multi-parameter addressing
3.2.6 Bluetooth configuration
The FLEXI-FLOW™ Compact is delivered with Bluetooth disabled.
·
· Bluetooth can be enabled using Bronkhorst FlowSuite.
· When pairing, the instrument can be recognized by its serial number.
The first time the instrument is paired with Bronkhorst FlowSuite, a six-digit passkey must be created.
·
Subsequently, the instrument can only be paired by entering the passkey that is stored in the instrument.
·
· After pairing the instrument, Bluetooth can also be enabled or disabled by using digital communication. See
parameter section
· Configuration using a Bluetooth wireless connection requires powering the instrument through the power
connector or support interface.
3.2.7 Adjusting zero point
Zero-stability
The zero point of a Bronkhorst® flow meter/controller (the measurement signal that indicates the absence of a flow) is factory
adjusted at approximately 20 °C and atmospheric pressure (ambient conditions), with the instrument positioned upright. Under
normal circumstances (i.e. at stable process conditions), the zero point will remain stable. However, over time several factors
can induce a slight deviation of the measured value from the zero point, causing the instrument to detect a flow when in reality
there is none. Readjusting the zero point eliminates this deviation.
· After installation or relocation, always check the zero point.
If the instrument still detects a (steady) flow while all valves are closed and the fluid system is leak tight, adjusting
·
the zero point is recommended.
Prerequisites
Zeroing an instrument requires that:
the ambient conditions (temperature, pressure) match those of the operating environment of the instrument.
·
· the instrument is filled homogeneously and pressurized with the operational media, according to the typical process
conditions.
the instrument has been warmed up sufficiently.
·
· there is absolutely no flow through the instrument; preferably, this is achieved by closing a valve immediately after the outlet
of the instrument (control valve, shut-off valve).
Blocking the flow through the instrument is essential; zeroing an instrument while there is still a flow will lead to
measurement errors.
Procedure
Bronkhorst FlowSuite provides a quick and easy way to adjust the zero point of an instrument; the Autozero function
automatically performs the procedure described here.
To adjust the zero point using digital communication, set parameter values in the following sequence (see section
Parameters for more information about instrument parameters or click on a parameter name to jump directly to its full
28
description):
Sequence # Parameter
1 Setpoint
2 Init Reset
3 Control Mode
4 Calibration Mode
5 Calibration Mode
22
to set the instrument function.
29
for available parameters.
47
Bluetooth for the according parameters.
42
Value
or fSetpoint 0
29 30
64
45
9
46
47 0
47 9
Instruction Manual FLEXI-FLOW™ Compact
Bronkhorst®
Action
stop flow
unlock secured parameters
enable calibration mode
reset calibration mode
start zeroing
9.17.158G