Bronkhorst®
Instruction Manual EL-FLOW® Prestige
9.17.084N
35
Identification Number
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned char
RW
0…255
175
113/12
0x0E2C/3629
Bronkhorst® (digital) device type identification number.
Device Type
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned char[6]
R
-
90
113/1
0xF108…0xF10A/ 61705…61707
Device type information string; this parameter contains an abbreviation referring to the identification number.
3.9.4
Alarms and counter
Alarm and counter settings are most easily accessible via FlowPlot or FlowView software or a Bronkhorst® readout and
control unit (E-8000 or BRIGHT).
For more information about the alarm and counter parameters, see the according sub sections under
3.10
Adjusting zero point
The zero point (the signal that corresponds to zero flow) of a Bronkhorst® flow meter/controller is factory adjusted at
approximately 20 °C and atmospheric pressure, with the instrument in an upright position. If the ambient conditions or
mounting position are significantly different, the instrument might detect a flow when actually there is none. In that case,
the instrument needs to be adapted to the new conditions by re-adjusting the zero point.
Zeroing an instrument requires that:
·
the ambient conditions (temperature, pressure) match those of the operating environment of the instrument
·
the instrument is filled homogeneously with the operational media
·
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 absolutely essential; zeroing an instrument while there is still a flow will lead to
measurement errors.
Adjusting the zero point of an instrument can be done by the following methods:
·
manually (using the multifunctional switch)
·
digitally (via RS232 or fieldbus)
·
with the autozero function of a Bronkhorst® readout and control unit (E-8000/BRIGHT)
Once started, the procedure takes approximately 5 seconds to complete (longer if the output signal is unstable), regardless
of the preferred method.
3.10.1 Manual procedure
To start the built-in autozero function with the multifunctional switch, follow these instructions:
1. Change the setpoint of the instrument to 0 (zero)
2. Press and hold the multifunctional switch. After 4 seconds, the red LED
•
starts glowing for 4 seconds, after which the
green LED
•
starts glowing
3. At that moment (which is after 8 to 12 seconds), release the switch
The green LED starts to blink fast, indicating that the autozero function is being performed. On (successful) completion, the
green LED starts to glow continuously, while the output signal is 0% (parameter
Measure
= 0).