Instruction Manual
instruments for filling applications
Doc. no.: 9.17.075A Date: 22-07-2013
ATTENTION
Please read this Instruction Manual carefully before installing and operating the instrument.
Not following the guidelines could result in personal injury and/or damage to the equipment.
Important information. Discarding this information could cause injuries to people or damage to the Instrument or
installation.
Helpful information. This information will facilitate the use of this instrument.
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Additional info available on the internet or from your local sales representative.
Check the packing list to ensure that you received all of the items.
Do not discard spare or replacement parts with the packing material and inspect the contents for damage.
Bronkhorst Cori-Tech BV
Disclaimer
The information in this manual has been reviewed and is believed to be wholly reliable. No responsibility, however, is assumed for
inaccuracies. The material in this manual is for information purposes only.
Bronkhorst Cori-Tech BV
July 2013
Symbols
Receipt of equipment
Check the outside packing box for damage incurred during shipment. Should the packing box be damaged, then the local carrier
must be notified at once regarding his liability, if so required. At the same time a report should be submitted to your distributor.
Carefully remove the equipment from the packing box. Verify that the equipment was not damaged during shipment. Should the
equipment be damaged, then the local carrier must be notified at once regarding his liability, if so required. At the same time a
report should be submitted to your distributor.
Refer to "Removal and return instructions" about return shipment procedures.
Equipment storage
The equipment should be stored in its original packing in a cupboard warehouse or similar. Care should be taken not to subject the
equipment to excessive temperatures or humidity.
Copyright
© 2013 Bronkhorst Cori-Tech BV
All rights reserved. This documentation is protected by copyright.
Subject to technical and optical changes as well as printing errors.
The information contained in this document is subject to change at any time without prior notification. Bronkhorst Cori-Tech BV
reserves the right to modify or improve its products and modify the contents without being obliged to inform any particular
persons or organizations. The device specifications and the contents of the package may deviate from what is stated in this
document.
9.17.0752
Table of contents
General description 1
.................................................................................................................................................................... 4
.................................................................................................................................................................... 51.1
1.2
1.3
3.1 Getting started
4.1 Main window layout FlowPlot
8.4 FlowPlot settings
11.2 Service
.................................................................................................................................................................... 5
.................................................................................................................................................................... 5
System requirements 2
.................................................................................................................................................................... 6
.................................................................................................................................................................... 62.1 Personal Computer
.................................................................................................................................................................... 62.2 Software on Personal Computer
Installation and startup of FlowPlot and FlowDDE 3
.................................................................................................................................................................... 7
.................................................................................................................................................................... 7
.................................................................................................................................................................... 73.2 Installation
.................................................................................................................................................................... 73.3 Main window layout FlowDDE
Operation 4
.................................................................................................................................................................... 9
.................................................................................................................................................................... 9
Readout in mass flow or volume flow 5
.................................................................................................................................................................... 10
.................................................................................................................................................................... 105.1 Adjust instrument unit type
.................................................................................................................................................................... 115.2 Adjust instrument capacity (FS range)
.................................................................................................................................................................... 125.3 Setting instrument flow range and filters
Preparing the counter for batch counting/dosing 6
.................................................................................................................................................................... 13
.................................................................................................................................................................... 136.1 Analog operation
On-off dosing using a shut-off Valve 7
.................................................................................................................................................................... 14
.................................................................................................................................................................... 177.1 Using hold current for energy saving with shut-off valves
Proportional filling 8
.................................................................................................................................................................... 18
.................................................................................................................................................................... 198.1 Proportional filling example
.................................................................................................................................................................... 208.2 Controller options
.................................................................................................................................................................... 218.3 Parameter settings
.................................................................................................................................................................... 22
Very small batch dosing 9
.................................................................................................................................................................... 23
Troubleshooting 10
.................................................................................................................................................................... 24
Disclaimer and Service 11
.................................................................................................................................................................... 25
.................................................................................................................................................................... 2511.1 Disclaimer
.................................................................................................................................................................... 25
Bronkhorst Cori-Tech BV
39.17.075
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1 General description
CORI-FILL technology, integrated in (mini) CORI-FLOW instruments is based on Coriolis instruments firmware with additional batch
counter facilities. The instrument uses its integrated PID-controller and batch counter to directly control, shut-off valves,
proportional valves or pumps to enable compact, accurate filling applications.
CORI-FILLTM basic setup
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1.1
Features:
Less supply pressure needed as for proportional valves due to large orifices
Low dead volume between sensor and valve
Fast (up to < 0.5 sec. dosing time)
Adaptive overrun correction
Optimal accuracy after a few batches
Adjustable correction factor for faster or slower overrun correction
Cost effective and very compact
Also useable for on-off switching of pumps
Electrical as well as pneumatically shut-off valves available
Features:
“First time right” batch (no overrun correction needed)
Suitable for longer dosing times (> approx. 5 seconds)
Will need at least same pressure drop as over Coriolis sensor for stable
control, only to be used if supply pressure is sufficient
Also usable for pump control
Adjustable P-action on batch counter
by controlling the pump in speed (via integrated U/f-converter) or by just
switching the pump on and off using the shut-off filling method. It will follow
the features for the according filling method.
(Liquid) pumps can be used in stead of valves by just connecting the instrument
controller output signal (voltage or current) to an analog input signal at the
valve for speed control (if available for the pump) or use a relay to switch the
pump using the controller output signal.
The controller output signal can drive up to 4 Watt of energy.
For speed control of pumps a 300 Ohm resistor parallel to the analog input is
advised. Your local sales representative can provide more information about
this.
Bronkhorst Cori-Tech BV
1.2
1.3
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Operating System regional number settings
Decimal symbol
. (point)
Digit grouping symbol
, (comma)
Note: The digit grouping symbol of currency must always differ from the numbers decimal symbol (see Microsoft’s
KB198098). Having equal symbols is not valid and will cause problems, not just for this program but for other
programs as well. In this situation check that the digit grouping symbol of currency does not contain a . (point). If so,
choose any other character.
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Advised software: download the latest version of FlowPlot and FlowDDE form our website
FlowPlot: http://downloads.bronkhorst.com/details.asp?dlid=1248334507
FlowDDE: http://downloads.bronkhorst.com/details.asp?dlid=1308902868
2 System requirements
2.1 Personal Computer
Minimum requirements:
Pentium PC - 700 MHz / 32 MB internal RAM
20 MB free disk space for program files
1024 x 768 x 256 color display
Operating system: Windows 2000 UK, Windows XP UK or Windows Vista UK 32-bit, Windows7.
The regional settings for numbers have to be set to the values in the table below.
2.2 Software on Personal Computer
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Make sure your instrument is powered and connected to your
PC with a special RS232 (split-) cable like in the picture below.
Note:
use a 15...24Vdc power supply.
First start-up FlowDDE, than start-up FlowPlot.
Start FlowDDE through the Start
menu: Start >> Programs >>
Bronkhorst >> FlowDDE
When FlowDDE is started and
indicating that it is ready for any
client, the main window is shown.
Select: Communication >>
Communication Settings and select
the COM-port on your PC which is
connected to the instrument.
Select: Communication >> Open
communication and wait until the
message “Server is active and ready
for any client” appears on the
screen.
Figure 1 - The FlowDDE main window for communication between instrument and
MS-Windows environment.
3 Installation and startup of FlowPlot and FlowDDE
3.1 Getting started
3.2 Installation
Follow the on-screen instructions when installing FlowPlot and FlowDDE.
The default installation folder is: C:\Program files\Bronkhorst\FlowPlot and C:\Program files\Bronkhorst\FlowDDE.
3.3 Main window layout FlowDDE
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Start FlowPlot through the Start
menu: Start >> Programs >>
Bronkhorst >> FlowPlot
At the screen “Select
parameters” connect the
colored lines to:
FlowDDE/FlowDDE2
channel number (typically = 1)
parameter number
e.g. like in picture on the right.
It is possible to use up to 8 plotlines in different (pre-defined) colors to watch the dynamic behavior of these signals
in time. Mode 18. RS232 (or mode 0 : bus & RS232) should be selected to enable your PC to take over setpoint
control for the Coriolis instrument.
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For more detailed information about FlowPlot and FlowDDE see:
FlowPlot manual
http://www.bronkhorst-cori-tech.com/files/downloads/manuals_english/917030manual_flowplot.pdf
FlowDDE manual
http://www.bronkhorst-cori-tech.com/files/downloads/manuals_english/917067manual_flowdde.pdf
Press OK to go to Main screen.
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In the beginning this screen is empty
Counter value (100% is counter limit)
Density (100% = 2000 kg/m3 - 0% = 0 kg/m3)
Temperature (percentage = °C)
Setpoint (wanted value; 100% = FS = capacity)
Measure (actual flow; 100% = FS = capacity)
Controller output value
Pressing “Instrument settings” will pop-up another screen for adjusting the instrument settings.
4 Operation
4.1 Main window layout FlowPlot
This screen shows the selected parameter value sizes as a function of the time to get an impression of the dynamic flow (and other
parameter) behavior.
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5 Readout in mass flow or volume flow
5.1 Adjust instrument unit type
At the Tab “Basic” it is possible to prepare the instrument for mass flow readout, like e.g. g/h or kg/h or volumetric readout values
like e.g. l/min or ml/h. The counter will automatically switch to similar units like g or ml etc.
As the sensor can measure actual density, batch size can be given in mass and volume. To measure in volume, select “Volume
Flow”, the density should be specified manually.
When “Actual Volume Flow” is selected, the actual density will be used to convert mass flow to volume flow.
Normal Volume Flow and Standard Volume Flow are typical gas (mass)flow units. It will be necessary to enter the density at normal
(0 °C) and 1 atm. or at standard (20 °C) and 1 atm. conditions to be able to get the correct volumetric readout.
In order to change filter settings please see section 5.3
.
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be adjusted easily.
At [Capacity and unit] a full scale value can be entered with digits or by using the
slider. Depending on the instrument the full scale value will be a value between a
minimum and a maximum capacity.
The full scale value will be indicated as 100% value in FlowPlot.
Analog output signals will be re-scaled for this new capacity.
E.g. 4-20mA: 20 mA corresponds to FS capacity value (100%).
The flow value to be used for filling can be calculated as follows:
Flow speed = batch / dosing time.
Examples:
If you would like to dose a batch of 10 g in 2 seconds, the flow speed will need to
be:
Flow = (10 g / 2 sec) * 3600 sec = +/- 18000 g/h (M14)
If you would like to dose a batch of 500 mg in 10 seconds, the flow speed will
need to be:
Flow = (0.005 g / 10 sec) * 3600 sec = +/- 180 g/h (M13)
Please mind that this is a theoretical approach, it is meant to give you an indication of the full scale value. In
practice the full scale value will need to be a little higher, because of the opening and closing time of the actuator.
The “counter control gain” value will also influence the total dosing time. This function is explained in section 8.
Please note this can only be used for proportional filling.
When a shut-off valve is used, the inlet pressure will determine the flow rate. Therefore it is very important to use a
correct and stable inlet pressure.
5.2 Adjust instrument capacity (FS range)
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The picture below shows the full factory FlowPlot version. Please note that FlowPlot customer versions will show less
Tab options.
Auto zero:
Before starting up a dosing process, it is important to auto-zero the instrument
before using it.
Auto-zero the instrument by using FlowPlot. Mind that the instrument should be
powered on for at least 30 minutes before doing an auto-zero, as the instrument
will warm up and this influences the measure value.
Before doing an auto-zero, make sure the tube is filled totally with fluid.
Therefore, give a setpoint for a few seconds. Make sure all gas bubbles are purged
out of the liquid or all liquid drops are purged out of the gas (when using gas).
Then, put the setpoint back to zero and make sure there is no flow. If possible
close other (manual) valves in the flow line. Now press the auto-zero button in
FlowPlot or on the instrument.
Filters:
Instrument filter settings can be adjusted (if needed).
All filters have values between 0…1. Low values mean more filtering. Filter is
switched off when value = 1.0.
The value(s) at “Sensor filter” will also influence the batch counter and the
controlling behavior. “Exponential” is to be set as follows:
0.1 : normal value
< 0.1 : when more dampening is needed (e.g. noise or vibrations);
will slow down measuring signal
0.1…0.5 : when faster signal is needed (e.g. for step responses < 0.5 sec.)
“Adaptive” setting is between 0…1 for CORI-FLOW series and not used (=0) for
mini CORI-FLOW series.
The values at “Output filter”: “Dynamic and Static” can be used to smoothen-up the flow value on the display or in
the graph and will not influence the batch counter.
Typical values are 1.0E-3 for both dynamic and static filter parts. Making these values lower will slow down the
signal (more filtering). Making them higher will speed up the signal (less filtering).
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For more detailed information see:
FlowPlot manual
http://www.bronkhorst-cori-tech.com/files/downloads/manuals_english/917030manual_flowplot.pdf
5.3
In the Tab “Basic” it is possible to (re)range the instrument. Just set the desired range at “Full scale value” or use the slider. A value
between minimum and maximum indicated values can be entered.
If needed the controller speed can be easily adjusted at “Speed”. More advanced controller settings can be adjusted at the Tab
“Controller”.
Setting instrument flow range and filters
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After setting the counter mode in “up to limit” and giving the right limit (=batch),
the overrun correction and counter control gain need to be entered, depending on
short time dosing using a shut-off valve or proportional filling (see subsequent
sections 7 and 8).
The counter control gain is of no influence when the dosing is performed with a
shut-off valve.
‘New setpoint on limit’ should be enabled. The ‘New setpoint’ value will normally
be = 0% (= setpoint when reaching the batch).
‘Output’ can be set as shown left, but will not have any effect on batching.
‘Reset’ will determine the enabled sources for resetting the counter.
Following options are available:
FLOW-BUS(Bus and RS232)
Keyboard (using the button on the instrument)
Ext. (external input on optional pc-board)
Analog setpoint (external setpoint input)
When using this option in on-off dosing mode (with shut-off valves) the setpoint value is irrelevant, as long as it is
>2%. For proportional filling with a proportional valve the setpoint value is important!
6 Preparing the counter for batch counting/dosing
6.1 Analog operation
CORI-FILL can also be used in analog mode. The setpoint will be determined by analog signals like 0..5V/0..10V/0..20mA/4..20mA.
The counter will be reset by an analog signal of 0V or 0mA. Any analog signal > 0 (over 2%) will restart the next batch.
Example analog operation:
Analog setpoint
change for reset
and starting next
batch
Flow rate
or
Correct
settings
via RS232
(just once)
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Dosing example:
Counter limit = 10.00g.
Measured counter value = 9.98g
Counter value line in FlowPlot = 99.8%
Give a setpoint of any value, a shut-off valve will either be open or closed, so
setpoint value is irrelevant.
Please use a correct and stable inlet pressure
Because of the self learning principle (overrun correction) the requested
counter value will always be very accurate.
The Counter control gain option has no influence on dosing with a shut-off
valve. This formula is explained in section 8.
Overrun correction (on-off control):
A correction value between 0 and 1 can be entered. Therefore, when a value
is entered, the system will close the valve a fraction earlier or later,
depending on the overrun (or underrun). An overrun correction of 0.8 has
proven to be a proper functioning value. The closing value for the valve is
calculated by the following formula:
Closing value = Limit value – (Overrun correction *
(Last actual dosing value – Limit value)).
PID settings can't be used in combination with shut-off valves!
7 On-off dosing using a shut-off Valve
For example: if the last limit value for the dosing was 10g and the actual measured value was 10.50g, considering a overrun
correction factor of 0.8, for the next dosing the valve will close at: 10 – ( 0.8 * (10.5 – 10) ) = 10 – 0.40 = 9.60g
This correction is a continuous process, therefore it ensures that the requested dosing value will come to 10g.
Lower correction values can be used to filter instabilities in supply pressures, this will result in more cycles before the requested
batch is reached. Higher values result in fast correction and less cycles before final batch is reached.
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CoriCalc is a Coriolis Calculation routine, integrated in Bronkhorst's online software tool "FLUIDAT on the Net"
www.fluidat.com (free registration for users of Bronkhorst instruments)
It is important that the maximum flow does not exceed 130% of the maximum FS of the instrument. Values above
130% of the full scale value will not be measured. If this is the case, there are a few possibilities to adjust this:
The pressure could be lowered
The flow could be restricted by using a manual valve
Flow speed:
When using shut-off valves the flow speed needs to be controlled by either the supply pressure or a manual needle valve. In many
cases the supply pressure will only be gravimetric by having a supply vessel at a certain level.
This means this supply pressure will not be very high.
Bronkhorst instrument sizing tool CoriCalc is needed to calculate the pressure drop across the Coriolis instrument. The correct inlet
pressure and consistency will have a positive influence on the batch accuracy.
If the “measure” line (green) exceeds 130% of the set full scale (e.g. 10 kg/h), but not exceeds the max. full scale (e.g. 30 kg/h), it
won’t have any influence on the counter. Please keep in mind that this specific 130% rule will only work for filling applications
using the up to limit mode (counter).
Green sensor signal ‘clips’ at 130% -> however the counter line (grey) has a constant upward trend.
By increasing the full scale value the measure line will be visible.
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After increasing the FS value, the flow signal can be measured and be shown correctly in the plotted graph.
The batch value of the counter (grey line) remains 100% as shown in both plots.
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In order to open the valve (open current) the output signal can be set at [valve
powers] Max. The hold signal (current) can be separately set at [valve powers]
Open.
These values might differ for each type of valve, depending on e.g. the coil. Using
the energy saving option will result in less power dissipation at the valve and thus in
lower temperatures. For fluids sensitive to evaporation/boiling, this option might
be very useful.
7.1
Using hold current for energy saving with shut-off valves
The yellow lines show the controller output signals to the valve. After 1 sec. opening current valve switches to hold current to save
energy and to avoid heat dissipation at electrical coils.
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Counter control gain (proportional filling):
In this mode the PID-controller will be used. This function will work as follows:
The counter starts running up to limit until a certain moment where the controller
starts to slow down. This is needed in order to approach the limit carefully which will
avoid overshoots. The point of slowing down can be set by means of counter control
gain. This value can be changed from 1…100.
Flow value where counter will start to force the setpoint down can be calculated as
follows:
(1 - 1/x ) * 100%. (x = counter control gain value).
In the example to the left, the counter control gain = 2, which means that setpoint
value will go downwards after reaching 50% of the limit (10 g). So at 5g, the counter
will force the controller to decrease its setpoint. Setpoint will decrease down to 2%
(automatically controlled by an additional P- controller for the counter). The last part
of the batch will be dosed at 2% flow rate of the capacity. An example is shown at the
following page.
Note: Fast and accurate proportional filling is possible, therefore it is important to set a few controller options, such
as FS value, counter control gain and the PID-Kp value. Please see section 8.2 & 8.3 for controller options and
findings in practice.
Counter control gain (X)
Counter value where controller will slow down
0
No slowing down; controller stops if limit has been reached
1
0%, so immediately when counter starts running
2
50% of max. limit of counter
3
67% of max. limit of counter
4
75% of max. limit of counter
5
80% of max. limit of counter
10
90% of max. limit of counter
50
98% of max. limit of counter
100
99% of max. limit of counter
Please try to make sure that the last phase of dosing will be performed at 2% setpoint, otherwise there could be an
overdose. If this cannot be avoided or when dosing at 2% will still give an overdose, you might consider for enabling
the overrun correction. Both mechanisms can be active at the same time with proportional filling.
8 Proportional filling
In the “Alarm & Count” tab, the counter setting can be found. The counter will count the total amount of flow passing through the
instrument. The counter has three modes: [Off], [Up] and [Up to limit]. For filling applications, the [Up to limit] has to be selected.
In order to perform a dosage a setpoint value (e.g. 100%) has to be selected. The setpoint value is related to the full scale value.
Setpoint can be changed once the limit has been (or will be) reached. By enabling [new setpoint on limit] and set it at 0.0%, the
dosing set-up is created. Select [reset counter] to perform a dosage. (When the desired limit has been reached, setpoint will be set
to zero).
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Test instrument: M14 with Tuthill DGS.23 gear pump; 100% = 30 kg/h water.
8.1 Proportional filling example
Counter controller gain
This value determines when the additional P-controller on the batch counter
will force the setpoint downwards. In this example this value = 8, meaning at
87.5% setpoint will go down.
Dosing settings
Note: Make sure setpoint will be controlled
down to 2%. The last drop should be dosed
at 2% to avoid overshoots for the batch
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Valve powers, with the learn open function the instrument will
determine what the opening voltage of the used actuator is
(e.g. a valve or a pump).
After this value is known the opening response will be adapted to
decrease the dead time during setpoint steps from zero.
Setpoint slope. Normally = 0, except when PID-Td > 0.
PID-Kp: Typical = 10. Increase in range 10…100 to make controller
faster. Decrease to slow down.
PID-Ti: Typical = 0.1. Decrease in range 0.02..0.1 to make controller
faster. Increase from 0.1…2 to slow down.
PID-Td: Typical = 0. Increase a little (0…2 sec.) to differentiate dead
volume if necessary.
Special adjustment for PID-Kp at certain situations for extra speeding
up or slowing down.
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For more detailed information about FlowPlot see:
FlowPlot manual
http://www.bronkhorst-cori-tech.com/files/downloads/manuals_english/917030manual_flowplot.pdf
8.2
Controller options should be set for fast response. Below typical (fast response) settings for a pump controlled by a mini CORIFLOW instrument.
Controller options
Extra information
The PID scale can be adjusted by double clicking the highest value on the scale as shown below.
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Full scale value in kg/h
2g5g10g
15g
20g
30g
40g
50g
75g
100g
150g
200g
500g
M12
M13
M14
2,5611
15,51926,5303030303030
30
M15
M54
M55
Dosing time in seconds
2g5g10g
15g
20g
30g
40g
50g
75g
100g
150g
200g
500g
M12
M13
M14
5,5
5,555,5
5,56781114202662
M15
M54
M55
CCG
2,5344444,5
5,38111622
50
PID-Kp
25252525252525202020202020
PID-Ti
0,08
0,08
0,08
0,07
0,08
0,08
0,1
0,1
0,1
0,1
0,1
0,1
0,1
8.3 Parameter settings
Test performed with a M14 and Tuthill DGS.23 gear pump. Used liquid = water.
The first table will give an indication of the full scale value (kg/h) in relation with the desired batch in grams.
The second table shows the fastest dosing time in seconds, with a dosing accuracy better than 0.5%.
The overrun correction is set to zero. When using the overrun correction, dosing will be more accurate!
The counter control gain (CCG) has to be adjusted to the batch size.
The PID controller settings vary per application.
Please note that these values are indicative, it can vary per application. In section 8.4 the FlowPlot settings are shown for a batch
of 20 gram.
Dosing accuracy better than 0,5%
Dosing accuracy better than 0,5%
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Important settings:
For fast and accurate proportional dosing it
is import to create a small overshoot, like
10% as shown on the left. By doing this the
Coriolis instrument has more time to control
the requested dosage.
This is especially important for small
dosages. The graph shows a dosage of 20
gram in 5.5 seconds. Please see the correct
settings on the next page.
An overshoot can be created by increasing
the PID-Kp and PID-Ti value.
8.4 FlowPlot settings
These settings are used to dose a batch of 20 gram.
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9 Very small batch dosing
Challenge:
Dosing a very small batch (60 mg) in a short period (1 sec.)
Flow needed:
0.060 g * 3600 sec = 216 g/h (M13 using a shut-off valve)
Please keep in mind that the opening + closing will be around 0.5 seconds.
Total dosing time will be 1 + 0.5 = 1.5 sec.
Points of attention:
Use a small dosing needle.
To calibrate, handle weighing scale with care; dose under fluid level to avoid drops at the needle. Weighing scale should have
right resolution and should be mounted horizontally on spirit level.
Monitor density and temperature to detect gas bubbles in the fluid. Make sure there are no gas bubbles in the fluid. They will
cause deviations in batches. Best is to use pressurized vessels without direct contact of the gas to the liquid to avoid dissolution
of gas in the liquid. E.g. vessel with diaphragm.
Make sure pressure to vessel is very constant. Behavior of pressure controller can be seen in batch results. Better is to
pressurize the vessel and close the gas inlet valve to stabilize the pressure in the valve (this can only be done using low flow
rates).
Make sure to have short line between valve and dosing spot (needle) as on the pictures.
Make sure FlowDDE and FlowPlot polling/sampling time is fast enough. This is 100 msec. for standard. For this kind of fast
dosing tests, times should be set down to approx. 20..25 msec.
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10 Troubleshooting
Symptom
Possible cause
Action
Suddenly a wrong value will be dosed
among a sequence of right values
when using on-off dosing with shut-off
valves.
(Back) pressure waves caused at
valve closing with high force might
give erratic reading at (mini) CORIFLOW.
Sudden pressure in- or decrease.
Select a different valve type
Make sure to have some volume or
dampener between valve and meter
Monitor ‘hardware error’ at alarm info
byte at instrument interface to indicate
this
Monitor ‘counter value’ at instrument
interface to detect this
Check inlet pressure
Even when dosing time is very short
flow signal is too slow
Filter settings might be not optimal.
Exponential smoothing filter value
probably too low.
Change exponential smoothing filter
setting. See section 5.
Large deviation on sequential batches
Filter settings might be not optimal.
Exponential smoothing filter value
probably too high.
Change exponential smoothing filter
setting. See section 5.
Supply pressure not stable
Check and stabilize pressure
Controller settings not optimal
Increase control stability by optimizing
PID settings.
Flow signal is >130%
Pressure too high
Lower the supply pressure
Resistance of flow line too low
Restrict the flow by using a manual valve
PID-Kp too high
Select a lower Kp value
FS value (capacity) too low
Increase the FS (capacity) value
Dosed value is not accurate enough
Flow meter has wrong zero point
Perform new auto-zero
Too many gas bubbles in liquid
Purge the flow meter
Vibrations disturbing the meter
Follow instructions for mounting
Flow signal >130%
Try to limit flow signal < 130%
Dosing time is too short
Increase dosing time
Proportional dosing is too fast
Adjust counter control gain to ensure
last part of dosing at 2%
Counter control gain too low
(Dosing too long at low flow)
Increase counter control gain to dose
longer at high flow (more accurate)
Reference instrument to check with is
not a weighing scale (e.g. volumetric
device)
Use a weighing scale and handle it
according to the instructions
Proportional dosing @2% gives too much
overshoot
Lower flow rate (dosing speed) or enable
overrun correction
Air in the system causes drifting
Try to purge the air out of the system
Bronkhorst Cori-Tech BV
24
9.17.075
Bronkhorst Cori-Tech BV
For current information on Bronkhorst Cori-Tech and service addresses please visit our website:
http://www.bronkhorst-cori-tech.com
Do you have any questions about our products? Our Sales Department will gladly assist you selecting the right product for your
application. Contact sales by e-mail:
sales@bronkhorst-cori-tech.com
For after-sales questions, our Customer Service Department is available with help and guidance.
To contact CSD by e-mail:
support@bronkhorst-cori-tech.com
No matter the time zone, our experts within the Support Group are available to answer your request immediately or ensure
appropriate further action. Our experts can be reached at:
+31 573 45 88 39
11 Disclaimer and Service
11.1 Disclaimer
Because of the various hardware and software environments into which Bronkhorst software may be put, this software and the
accompanying files are "as is" and without warranties as to performance of merchantability or any other warranties whether
expressed or implied.
Bronkhorst is not responsible for lost profits or revenue, loss of use of the software, loss of data, costs of re-creating lost data, the
cost of any substitute equipment or program, or claims by any party other than you.
Although the equipment is thoroughly tested, Bronkhorst takes no responsibility for hardware or software failures which could
result in personal injury and/or damage to any customer equipment.
Bronkhorst strongly recommends a backup to be made before any software is installed.
Although every attempt has been made to make Bronkhorst software virus free there is no warranty for software viruses. The fact
that you are using the program indicates that you understand and agree to these terms.
11.2 Service
9.17.075
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