Mini CORI-FLOW
ATTENTION
Instruction manual
Compact Coriolis Mass Flow
Meters/Controllers for Liquids and Gases
Doc nr.: 9.17.050I Date: 03-02-2015
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.
BRONKHORST CORI-TECH B.V.
SCOPE OF THIS MANUAL
This manual covers the general part of digital mini CORI-FLOW mass flow instruments for
gases and liquids. It treats the general instructions needed for the instruments.
More information can be found in other documents.
Mini CORI-FLOW instruments have modular instruction manuals consisting of:
- Short form instruction manual mini CORI-FLOW (document nr. 9.17.052)
- General instructions mini CORI-FLOW (document nr. 9.17.050)
- Operation instructions digital instruments (document nr. 9.17.023)
- Fieldbus/interface description:
- FLOW-BUS Interface (document nr. 9.17.024)
- PROFIBUS-DP Interface (document nr. 9.17.025)
- DeviceNet Interface (document nr. 9.17.026)
- RS232 Interface with FLOW-BUS protocol (document nr. 9.17.027)
Modbus interface (document nr. 9.17.035)
-
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BRONKHORST CORI-TECH B.V.
Even though care has been taken in the preparation and
publication of the contents of this manual, we do not
assume legal or other liability for any inaccuracy,
mistake, mis-statement or any other error of whatsoever
nature contained herein. The material in this manual is
for information purposes only, and is subject to change
without notice.
Bronkhorst Cori-Tech B.V.
June 2011
Warranty
The products of Bronkhorst Cori-Tech B.V. are
warranteed against defects in material and workmanship
for a period of three years from the date of shipment,
provided they are used in accordance with the ordering
specifications and the instructions in this manual and
that they are not subjected to abuse, physical damage or
contamination. Products that do not operate properly
during this period may be repaired or replaced at no
charge. Repairs are normally warranted for one year or
the balance of the original warranty, whichever is the
longer.
See also paragraph 9 of the Conditions of sales.
The warranty includes all initial and latent defects,
random failures, and undeterminable internal causes.
It excludes failures and damage caused by the
customer, such as contamination, improper electrical
hook-up, physical shock etc.
Re-conditioning of products primarily returned for
warranty service that is partly or wholly judged nonwarranty may be charged for.
Bronkhorst Cori-Tech B.V. prepays outgoing freight
charges when any party of the service is performed
under warranty, unless otherwise agreed upon
beforehand. However, if the product has been returned
collect to Bronkhorst Cori-Tech B.V., these costs are
added to the repair invoice. Import and/or export
charges, foreign shipping methods/carriers are paid for
by the customer.
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BRONKHORST CORI-TECH B.V.
TABLE OF CONTENTS
1 INTRODUCTION .............................................................................................................................................. 6
1.1 General description ................................................................................................................................... 6
1.1.1 Gas / Liquid flow ................................................................................................................................. 6
1.1.2 Housing .............................................................................................................................................. 6
1.1.3 Valves ................................................................................................................................................ 7
1.1.4 Badger Meter Valves .......................................................................................................................... 9
1.1.5 Liquid dosing systems with pumps................................................................................................... 10
1.2 Sensor measuring principle ..................................................................................................................... 11
1.2.1 Mini CORI-FLOW sensor ................................................................................................................. 11
1.3 Valve principles ....................................................................................................................................... 11
1.3.1 Solenoid valve .................................................................................................................................. 11
1.3.2 Vary-P valve ..................................................................................................................................... 11
1.3.3 Pilot operated valve .......................................................................................................................... 11
1.4 Software for physical properties of gases and liquids. ............................................................................ 12
1.5 (mini) Cori-Flow accuracy ........................................................................................................................ 12
2 INSTALLATION .............................................................................................................................................. 16
2.1 Receipt of equipment .............................................................................................................................. 16
2.2 Return shipment ...................................................................................................................................... 16
2.3 Service .................................................................................................................................................... 16
2.4 Mounting instructions .............................................................................................................................. 17
2.4.1 Flow direction: .................................................................................................................................. 17
2.4.2 Base mounting: ................................................................................................................................ 17
2.4.3 Mounting position general: ............................................................................................................... 17
2.4.4 Mounting position (integrated) valve with purge connector: ............................................................. 17
2.4.5 Mounting position in pipe line for liquid applications: ....................................................................... 18
2.4.6 Liquid purging: .................................................................................................................................. 18
2.4.7 Mounting position in pipe line for gas applications: .......................................................................... 18
2.4.8 Gas purging: ..................................................................................................................................... 19
2.4.9 Inlet bends and pipe support: ........................................................................................................... 19
2.4.10 Pipe line reducers: ........................................................................................................................... 19
2.4.11 Vibrations: ........................................................................................................................................ 19
2.4.12 Crosstalk: ......................................................................................................................................... 20
2.5 Notes for temperature considerations ..................................................................................................... 20
2.6 Fluid/gas connections .............................................................................................................................. 21
2.7 Piping....................................................................................................................................................... 21
2.8 Electrical connections .............................................................................................................................. 21
2.9 Pressure testing ...................................................................................................................................... 22
2.10 Supply pressure ................................................................................................................................... 22
2.11 System purging .................................................................................................................................... 22
2.12 Seals .................................................................................................................................................... 22
2.13 Equipment storage............................................................................................................................... 22
2.14 Electromagnetic compatibility .............................................................................................................. 23
2.15 Electro static discharge........................................................................................................................ 24
3 OPERATION .................................................................................................................................................. 24
3.1 General .................................................................................................................................................... 24
3.2 Power and warm-up ................................................................................................................................ 24
3.3 Start-up .................................................................................................................................................... 24
3.4 Zeroing .................................................................................................................................................... 25
3.4.1 What is zero-stability ? ..................................................................................................................... 25
3.4.2 Procedure for zeroing ....................................................................................................................... 25
3.4.3 Zero-procedure information ............................................................................................................. 25
3.4.4 Alternatives for starting zero procedure ........................................................................................... 26
3.4.5 Zeroing with the Micro-switch ........................................................................................................... 26
3.4.6 Zeroing through the digital communication ...................................................................................... 26
3.5 Operating conditions ............................................................................................................................... 27
3.6 Manual operation ..................................................................................................................................... 27
3.7 Analog operation ..................................................................................................................................... 27
3.8 BUS / digital operation ............................................................................................................................. 28
3.9 RS232 communication cable T-part ........................................................................................................ 29
4 MAINTENANCE ............................................................................................................................................. 30
4.1 General .................................................................................................................................................... 30
4.2 mini CORI-FLOW sensor ........................................................................................................................ 30
4.3 Controllers ............................................................................................................................................... 30
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4.4 Control valves .......................................................................................................................................... 30
4.4.1 Solenoid valves ................................................................................................................................ 30
4.4.2 Vary-P valve ..................................................................................................................................... 30
4.4.3 Pilot operated valve .......................................................................................................................... 31
4.5 Kv-value calculation ................................................................................................................................. 31
4.5.1 For gases ......................................................................................................................................... 31
4.5.2 For Liquids ....................................................................................................................................... 32
4.6 Calibration procedure .............................................................................................................................. 33
4.7 Instrument re-ranging .............................................................................................................................. 34
4.8 Instrument filter settings .......................................................................................................................... 34
5 INTERFACE DESCRIPTION.......................................................................................................................... 35
6 TROUBLESHOOTING ................................................................................................................................... 35
6.1 General .................................................................................................................................................... 35
6.2 Calibration check ..................................................................................................................................... 35
6.3 Troubleshooting summary general .......................................................................................................... 36
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BRONKHORST CORI-TECH B.V.
1 INTRODUCTION
1.1 General description
1.1.1 Gas / Liquid flow
The Bronkhorst Cori-Tech B.V. series mini CORI-FLOW mass-flow meter/controller for gases and liquids is an
accurate device for measuring gas and liquid flows up to 200 bara depending on body rating, virtually
independent of pressure and temperature changes. The mini CORI-FLOW is a real mass-flow meter/controller
and measures the flow in mass, it does not matter what the properties of the gases or liquids are. The system
can be completed with a control valve or a pump and flexible readout unit to measure and control gas and
liquid flows.
Mini CORI-FLOW series by Bronkhorst Cori-Tech B.V. are precise and compact Mass Flow Meters and
Controllers, based on the Coriolis measuring principle. Designed to cover the needs of the low flow market,
there are 4 models to overlap flow ranges from 5 g/h up to 300 kg/h (full scale values), each offering “multirange” functionality: factory calibrated ranges can be rescaled by the user, maintaining the original accuracy
specs. The instruments are equipped with a robust IP65 weatherproof housing.
Instruments of the mini CORI-FLOW series contain a uniquely shaped, single loop sensor tube, forming part of
an oscillating system. When a fluid flows through the tube, Coriolis forces cause a variable phase shift, which
is detected by sensors and fed into the integrally mounted pc-board. The resulting output signal is strictly
proportional to the real mass flow rate. Coriolis mass flow measurement is fast, accurate and inherently bidirectional. The mini CORI-FLOW features density and temperature of the fluid as secondary outputs.
1.1.2 Housing
Each instrument housing style incorporates several provisions to comply with EMC requirements.
Also the instrument housing is a robust IP65 weatherproof housing.
Meter housing M12-M14 Meter housing M15 Controller housing
with metal seal valve
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BRONKHORST CORI-TECH B.V.
C2I valve
C2I valve = normally closed
C5I valve
1.1.3 Valves
M12, M13 and M14 mini CORI-FLOW controllers are fitted with a fixed or modular valve.
The M15 mini CORI-FLOW controller can only be equipped with a modular valve.
Integrated valves for liquids and gases
For liquids the valve has an extra purge adaptor on top for de-gassing.
In case of a modular valve it is attached by means of a port connector.
Possible combinations:
M12
M13
M14
M15
Liquid Gas
C2I
F-033CI
C2I
C5I
F-033CI
C2I
F-033CI
C2I
C5I
F-033CI
F-004AI
Valves:
Direct operating valve for liquids
(“open” sleeve) metal sealed with
purge connector.
C0I, C1I
F-033CI
C01, C1I
C5I
F-033CI
C0I, C1I
F-033CI
C5I
F-033CI
F-004AI
F-012AI, F-013AI
Direct operating valve for liquid/gas
metal sealed.
C5I valve = normally closed
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BRONKHORST CORI-TECH B.V.
C0I / C1I valve
C1I valve = normally open
F-033CI valve
F-033CI valve = normally closed
F-004AI / BI valve
F-004AI/BI valve = normally closed
F-012AI/F-013AI valve
F-012AI/F-013AI valve = normally closed
Direct operating valve for gases
metal sealed
C0I valve = normally closed
Vary-P operating valve for liquid/gas
elastomeric sealed
Bellow valve for liquid/gas
elastomeric sealed
Pilot operated valve for gases elastomeric
sealed
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1.1.4 Badger Meter Valves
For those special applications where the Bronkhorst valves do
not meet the specifications anymore we can use Badger Meter
valves as a good alternative.
Reasons for using an alternative valve could be requirements
for:
- Higher maximum pressure or delta-pressure
- Higher Kv-values
- Higher or lower temperatures
- Faster response time
- Metal sealed (e.g. for supercritical gases like CO2 or
ethylene)
Badger Meter offers a wide range and variety of valves. These
membrane valves are operated indirectly using an I/P-converter
with compressed air. The I/P-converter is connected to the controller output of the mini CORI-FLOW.
To be able to meet the quality and security standards Bronkhorst is used to, we will accept only those Badger
Meter valves which meet the “Bronkhorst Quality Norm”.
This norm includes certain predefined specifications to enable our production department to adjust, optimize
and test these valves if they were Bronkhorst valves.
Main items on this “Bronkhorst Quality Norm” are:
• Limit amount of models: RC200, ¼”, ½” and 1” types
• Special O-ring chambers in valve bodies for Swagelok RS adaptor types (no NPT)
• If no O-rings possible: adaptors welded to valve body
• Spindle seals: Kalrez compound 3035 (in stead of Teflon) for reduced emission
For operation interface:
• ABB TEIP11 I/P-converter: input signal 4-20 mA / output signal 0,2-1 bara
(or 0.4-2 bara)
• If not possible: Samson 3730-0 positioner
Please note that for proper functioning of the pump or valve the MFC needs to be adjusted electrically and also
needs to be provided with the right parameter settings. This will be taken care of in our factory.
For pump- or valve connections in the field after delivery, please contact your local sales representative.
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BRONKHORST CORI-TECH B.V.
1.1.5 Liquid dosing systems with pumps
In Bronkhorst liquid mass dosing systems Liqui-Flow or CORI-FLOW instruments control liquid mass flow
using a pump through a U/f converter. The pump is just used as an actuator to follow the controller to achieve
the wanted mass flow (setpoint). It is not used as a positioner as it normally is, using the standard pump control
software. Normally Bronkhorst will take care of all electrical and mechanical connections between the parts as
mentioned above are realized, as well as an optimization of the PID-control and a test on water/IPA (when
possible).
The analog controller output signal, which normally would be used to drive a proportional valve, is limited to
either 10 Vdc/15 Vdc and connected to the analog input signal of the pump drive.
Each Liquid Dosing System consists of a flow sensor with controlling function, a pump and all inter-connecting
material. A filter and check valve can be supplied on request. Furthermore, Bronkhorst will take care of
electrical and mechanical connection, testing and optimization including the PID-integrated controller.
In addition to the Bronkhorst Liquid Pump for small flow ranges, a complete series of pumps is available for
those applications which require higher flow rates, higher pressures, wide control ranges or aggressive fluids.
Further to operation in an analog mode, the system can also be used digitally with RS232 or with on-board
interface to PROFIBUS-DP
®
, DeviceNet™, Modbus-RTU, or FLOW-BUS.
See picture below for schematic setup.
Please note that for proper functioning of the pump or valve the MFC needs to be adjusted electrically and also
needs to be provided with the right parameter settings. This will be taken care of in our factory.
For pump- or valve connections in the field after delivery, please contact your local sales representative.
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BRONKHORST CORI-TECH B.V.
Flow control
valve
pressure
compensating
valve
flow control
valve
P1
pilot valve pressure
compensating
valve
P2
flow control valve
1.2 Sensor measuring principle
1.2.1 Mini CORI-FLOW sensor
Mini CORI-FLOW mass flow meters/controllers operate according to the Coriolis principle.
The instrument can be used to simultaneously measure the mass flow, temperature and density.
When a fluid flows through a vibrating tube, Coriolis forces are generated which bend or twist the tube.
The extremely small tube displacements are detected by optimally positioned sensors and evaluated
electronically.
Since the measured phase shift of the sensor signals is proportional to the mass flow, the mini CORI-FLOW
measures the mass flow directly. The measurement principle is independent of the density, temperature,
viscosity, pressure, heat-capacity or conductivity. The tubes always vibrate at their natural frequency, which is a
function not only of the tube geometry and the tube material properties but also the mass of the fluid in the
vibrating tubes.
1.3 Valve principles
Control valves are not designed to provide positive shut-off, although some models have excellent capabilities
for this purpose.
It is recommended to install a separate shut-off valve in the line if required. Also pressure surges, as may
occur during system pressurisation must be avoided. The following models can be distinguished:
1.3.1 Solenoid valve
This is considered to be the standard (direct operated) control valve. In
general it is a normally closed solenoid valve. The plunger is lifted by the
force of the magnetic field of the coil. The orifice under the plunger is
removable for optimising the orifice diameter. Also a normally opened
solenoid valve is available.
1.3.2 Vary-P valve
For process conditions where up- and downstream pressure
varies much, a special type of valve, VARY-P has been designed.
This valve consists of two valves, a solenoid operated control
valve and a fixed adjusted pressure compensation valve.
1.3.3 Pilot operated valve
For high flow rates the pilot operated valve has been designed. A
solenoid driven control valve controls the pressure difference across a
piston, which lifts the main plunger.
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Model
DN (mm)
Zero-stability
Nominal flow
M12
0.25
< 0.1 g/h
100 g/h
M13
0.5
< 0.2 g/h
1 kg/h
M14
1.3
< 6 g/h
10 kg/h
M15
3.12
< 50 g/h
100 kg/h
M53
1
< 10 g/h
5 kg/h
M54
2
< 50 g/h
50 kg/h
M55
4
< 100 g/h
500 kg/h
1.4 Software for physical properties of gases and liquids.
Bronkhorst has access to the physical properties of over 600 fluids in a database called FLUIDAT.
Application software, such as FLOW CALCULATIONS, enables the user to calculate properties, not only at
20°C / 1 atm but also at any temperature/pressure combination, both for gases and for liquids.
Apply to your distributor for more details about this software.
1.5 (mini) Cori-Flow accuracy
Zeroing of a (mini) Cori-Flow instrument is required each time process conditions have been changed.
What is zero-stability ?
Due to mechanical construction of the sensor tubes each (mini) Cori-Flow sensor will have a very small offset
signal, even when the mass flow is zero. This is called the zero-stability error and is specified for accuracy
separately for all Coriolis instruments. Main reason for this is the fact that this error can be (temporarily)
neutralized after performing a zero-action.
Immediately after zeroing, zero-stability error is 0%. However, it is allowed to move between a certain band
depending on the environment (process) and fluid conditions.
In ideal situations, where actual process conditions do not change, this error will remain the same.
See below for possible reasons of change of zero-stability. See also paragraph 3.4.1. to learn how to zero.
Zero-stability depends on the (mini) Cori-Flow model:
Nominal flow: mass flow rate of liquid at a pressure drop of approx. 1 bar and based on
reference conditions of water at approx. 20 °C
NOTE:
In practice zero-stability turns out to be better than the values in the table, but for calculation we will take worst
case values.
Accuracy
The accuracy of a (mini) Cori-Flow is either 0.2% reading for liquids or 0.5% reading for gases.
This specification is based on mass flow (e.g. g/h, kg/h, etc.). If the instrument will be used on volume flow
(e.g. l/h, ml/min, etc) this will introduce an extra inaccuracy, based on the density (measurement).
Process conditions
Each time process conditions have been changed significantly a (mini) Cori-Flow needs to be zeroed in order
to get rid of the offset error due to zero-stability. At least the very first time an instrument is used a zero
procedure will be required.
The zero-stability error will mainly change when one or more of the following items change significantly:
• Temperature (of fluid or environment)
• Pressure
• Density of fluid
• Vibrations working on instrument via environment
• Pulsation of supply pressure working on instrument
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0 %
+ x % error (zero stability)
- x % error (zero stability)
+/- 0.05% repeatability
What changes are allowed ?
How many changes in quantity for certain process conditions are allowed without the need of a new zero
procedure for the (mini) Cori-Flow depends on the influence this will have on the mass in the tubes.
As soon as a fluid will be measured at its critical point, a small change in process conditions like temperature
or pressure can already result in a rapid increase or decrease of density and/or dynamic viscosity. This will also
influence the mass (flow) in the sensor tubes and therefore the zero stability. So please try to avoid phase
changes or almost phase changes.
E.g. CO2 and Ethylene have a large transition area (“no meat, no fish”). Experiences in practice turned out that
measuring (and even controlling) in such an area can be highly accurate.
So measuring in critical, or even supercritical area’s, is good possible with (mini) Cori-Flow. Inaccuracies are to
be expected when a phase change takes place. See also gas or liquid.
Temperature changes of several °C or pressure changes of several bar for e.g. Air when measuring at 20°C
and 5 bara will not be a problem. This will not affect density or dynamic viscosity that much.
However when measuring e.g. Ethylene at 10°C and 52 bara, a small increase of temperature or decrease of
pressure will already result in large changes of density and even phase change. This last example might need
a new zero procedure to get rid of offset errors due to zero stability.
Error visualization
-> time
Temperature considerations
Effects on accuracy:
(Mini) Cori-Flow sensors do have an internal temperature measurement device for measuring fluid temperature
and compensation on mechanical changes of the sensor due to temperature changes.
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BRONKHORST CORI-TECH B.V.
Total error M14 up to 30 kg/h
-4%
-3%
-2%
-1%
0%
1%
2%
3%
4%
0 5000 10000 15000 20000 25000 30000
Flow [g/h]
Max. error [%RD]
|0.2| %RD + |6| g/h
Error calculation:
Total error = accuracy reading ± [(zero stab./flow)x100] [% reading]
Example 1:
error at 10 kg/h reading at M14 for a liquid (= ±0.2% of reading)
zero stability error of M14 < 6 g/h; calculate with 6 g/h
Total error = ±(0.2% + (6/10000 * 100))% = ±(0.2 + 0.06)% = ±0.26 % (= ± 26 g/h)
Example 2:
error at 500 g/h reading at M13 for gases (= ±0.5% of reading)
zero stability error of M13 < 0.2 g/h; calculate with 0.2 g/h
Total error = ± (0.5% + (0.2/500 * 100))% = ±(0.5 + 0.04)% = ±0.54 % (= ± 2.7 g/h)
Example 3:
Total error of M14 (at constant temperature)
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Gas and liquid
(mini) Cori-Flows can be used for gases and liquids.
In all instruments capable of density measurement (e.g. mini CORI-FLOW series) there will be an automatic
adjustment for change in density. CORI-FLOW M50-series however, cannot measure density.
For those instruments it is advisable to calibrate them on air for gases and on water for liquids.
Multi-range instrument
Thanks to extremely high linearity of the sensor, (mini) Cori-Flow instruments can be easily re-ranged to a
different full scale range (100% point). The analog output and the digital measured flow value will be scaled to
this FS 100% point.
E.g. An M13 can be used for a full scale between 50 g/h and 2000 g/h.
Switching between these ranges can be realized using fieldbus, E-7000, Bright module or RS232 interface.
There is free tooling software (FlowPlot) available for this purpose. Mini Cori-Flow instruments will get a
calibration certificate for all possible FS ranges. The actual FS of the instrument is set to a value wanted by the
customer and can be found on the gray sticker on the instrument.
Summary
In general: a (mini) Cori-Flow instrument is independent of physical properties.
Performing an auto-zero on actual conditions (with zero flow) before use will get rid of offsets in the sensor.
When these properties, like temperature, pressure, density and dynamic viscosity do not affect the mass in the
tube or the mechanical sensor construction to much, error due to zero-stability will be small.
Environment conditions are important to the mechanical behaviour of the sensor:
• Vibrations (of sensor, rack, pipes etc.) with frequencies or harmonics close to the sensor’s natural
frequency could result in errors in the measurement. Sensor oscillation frequencies vary from 90…450 Hz,
depending on the model.
• Pulsation of supply pressure may have negative influence on accuracy. Avoiding this is the best. Filtering is
an option for improvement.
• Turbulences in flow may add extra noise to the measured value. Especially with high flow of gases straight
pipes with lengths of 20..30 cm. at least are advisable for realizing a more undisturbed flow.
For other applications (e.g. liquids) inlets of about 10x inner diameter of tube are sufficient.
Smooth reducing from wide to small tubes is advisable. See below:
Optimal angle is approx. 7°
• Gas bubbles entrapped in liquids (and/or locked-up in sensor tube) give disturbances to flow
measurement, especially in the lower flow ranges. Try to avoid this and purge with high flow to remove
them.
• Fluid drops in gas flow (and/or locked-up in sensor tube) give disturbances to flow measurement,
especially in lower flow ranges. Try to avoid this and purge with high flow to remove them.
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BRONKHORST CORI-TECH B.V.
2 INSTALLATION
2.1 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:
BRONKHORST CORI-TECH B.V.
RUURLO HOLLAND
If applicable, otherwise contact your distributor.
Remove the envelope containing the packing list; carefully remove the equipment from the packing box.
Do not discard spare or replacement parts with the packing material and inspect the contents for damaged or
missing parts.
2.2 Return shipment
When returning material, always describe the problem and if possible the work to be done, in a covering letter.
It is absolutely required to notify the factory if toxic or dangerous fluids have been metered with the
instrument!
This to enable the factory to take sufficient precautionary measures to safe-guard the staff in their repair
department. Take proper care of packaging. If possible use the original packing box. Seal instrument in plastic
Contaminated instruments must be dispatched with a completely filled in 'declaration on
contamination form'.
Contaminated instruments without this declaration will not be accepted.
Note:
If the instruments have been used with toxic or dangerous fluids the customer should pre-clean the instrument.
Important:
Clearly note, on top of the package, the customer clearance number of Bronkhorst Cori-Tech B.V., namely:
NL818936514B01
If applicable, otherwise contact your distributor for local arrangements.
2.3 Service
If the equipment is not properly serviced, serious personal injury and/or damage to the equipment could be the
result. It is therefore important that servicing is performed by trained and qualified service personnel.
Bronkhorst Cori-Tech B.V. has a trained staff of servicemen available.
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2.4.1 Flow direction:
FLOW
2.4.2 Base mounting:
If there is no firm, steady, vibration-free base available, Bronkhorst Cori-Tech can offer a special
2.4.3 Mounting position general:
2.4.4 Mounting position (integrated) valve with purge connector:
+ Prevent running dry !
2.4 Mounting instructions
Install the mini CORI-FLOW in accordance with the direction of the FLOW arrow.
The arrow for flow direction is indicated on the mini CORI-FLOW, between process
fittings.
Mount the mini CORI-FLOW instrument, with screws in the body, to a rigid, stiff base body or heavy
mass on a vibration-free position, such as a wall, heavy rig or stable construction.
This is essential to achieve optimal accuracy with the mini CORI-FLOW instrument.
Examples: M1 M2 M3
mounting block for achieving optimal accuracy with the mini CORI-FLOW instrument.
This mounting block has a mass and stiffness precisely tuned for the specific mini CORI-FLOW model
and can be used as a base. Please contact your local sales representative.
For gas and liquid mini CORI-FLOW meters can be mounted in any position for a proper measurement.
M4 M5 M6
Only for mini CORI-FLOW instruments with (integrated) liquid valve with purge adaptor, mounting
position can be critical for a good quality of de-gassing.
M7 M8 M9
Gas bubbles might collect in sensor !
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2.4.5 Mounting position in pipe line for liquid applications:
Gas bubbles might collect in sensor! Gas bubbles might collect in sensor! Gas bubbles might collect in sensor!
2.4.6 Liquid purging:
minutes is recommended.
2.4.7 Mounting position in pipe line for gas applications:
For liquids, mount the mini CORI-FLOW at a level in the pipe where gas entrainment is not possible and
be certain that the mini CORI-FLOW is filled at all times during operation. Try to avoid gas accumulation
(in the sensor tube) at the highest point of a pipeline or in front of a control valve. Gas bubbles in the
sensor tube may result in measuring errors. If there is gas entrainment, make sure gas bubbles can
easily get out of the mini CORI-FLOW and piping.
M10 M11 M12
Prevent running dry!
M13 M14 M15
In order to remove gas bubbles during start-up, flushing with relatively high flow rate of liquid for some
For gases mount the mini CORI-FLOW at a level in the pipe line system where condensate can not
accumulate in the mini CORI-FLOW. Especially take care at the lower 3 situations at zero flow.
M16 M17 M18
M19 M20 M21
page 18 9.17.050
BRONKHORST CORI-TECH B.V.
2.4.8 Gas purging:
Verification of leaks is required prior starting up of the process.
2.4.9 Inlet bends and pipe support:
2.4.10 Pipe line reducers:
2.4.11 Vibrations:
In order to remove condensation drops during start-up, flushing with dry gas for some minutes with high
flow rate is recommended.
Leak tightness:
Avoid pipe bends too close to the mini CORI-FLOW inlet. This might cause turbulence (especially for
gases). Use pipe supports on equal distance of mini CORI-FLOW inlet and outlet.
M22 M23 M24
Avoid abrupt pipeline reducers and other obstructions in the piping. They can cause cavitation inside the
meter tubes and will result in higher pressure drops. Mount reducers outside the rigid pipe supports.
M25 M26
Avoid vibrations or mechanical shocks on the mini CORI-FLOW.
Flow vibrations of pumps can influence meter performances. Therefore avoid connecting the pump
directly to the meter or install a dampening device. A flexible connection (eg. Teflon tubing) or extra loop
in the piping to neutralize vibrations is advised. Do not mount the sensor in areas subject to vibration.
M27 M28 M29
9.17.050 page 19
BRONKHORST CORI-TECH B.V.
2.4.12 Crosstalk:
Be carefull when mounting two or more mini CORI-FLOW instruments close together. Vibrations from
one instrument might interfere with the resonance frequency of another instrument. Therefore, for
multiple mini CORI-FLOW instruments: mount them on rigid, stiff bases/masses individually, but
mechanically isolated from each other. Special mounting blocks can be isolated using rubber
suspension or caps for muffling/damping. These mounting blocks can be optionally obtained at your
local sales representative. It is favourable to mount the instruments parallel to each other.
Examples: M30 M31
2.5 Notes for temperature considerations
The mini CORI-FLOW has to be installed in such a way that levels of different temperature within the mini
CORI-FLOW are avoided. Avoid multiple heating and cooling of the instrument.
Temperature shocks have to be avoided in any case. (max. 1°C/sec)
After using the mini CORI-FLOW the first time at low temperature tighten the connector screws again in order
to prevent any leakage!
Please note: if you do not tighten the screws, the leaking connector / fitting can cause damage!
After the first shrinking and tightening of the screws, no further precaution is necessary.
Note that the maximum temperature in the housing of the mini CORI-FLOW is allowed to be up to 70 ºC max.
Also note that a mini CORI-FLOW will have an amount of self-heating due to the power dissipation on the
electronics (DSP). This self-heating can be up to approx. 15 ºC.
It will be at maximum if there is no flow (less cooling).
In practice, there will be a balance between fluid temperature, self heating, cooling effects and ambient
temperature at the instrument.
If the fluid is really hot, it would help if the instrument is in a cool environment. It will also depend on how well
the installation where the instrument has been mounted in/on is capable of cooling.
Anyway, one must take care that the instrument in the housing will not exceed the 70 °C, otherwise the
electronics will be damaged.
To check this, the internal temperature sensor can be used. Via FLOW-DDE/E-7000 or Bright it can be read
out. (FlowDDE par. 142).
Please make sure the temperature value readout here (=actual temperature in housing) will not exceed 70 °C.
On the next page some facts about maximum Tambient and Tfluid:
page 20 9.17.050
BRONKHORST CORI-TECH B.V.
Max. temperature in housing is 70ºC,but:
Operating temperature conditions (continuous):
Tfluid + Tambient < 110ºC With:
Tfluid < 100ºC
Tambient < 55ºC
For cleaning purpose, instrument without power (continuous)
Tfluid + Tambient < 130ºC With:
Tfluid < 130ºC
T ambient < 80ºC
In all situations:
Tfluid > 0 ºC
Tambient > 0 ºC
Storage temperature (dry tube)
[-30 .. 80] ºC
2.6 Fluid/gas connections
Bronkhorst Cori-Tech B.V. mini CORI-FLOW meters/controllers are equipped with compression or face-sealfittings. For leak tight installation of compression type fittings make sure that the tube is inserted to the
shoulder in the fitting body and that no dirt or dust is present on tube, ferrules or fittings. Tighten the nut fingertight; while holding the instrument and then tighten the nut 1 turn.
If applicable follow the guidelines of the supplier of the fittings. Special types of fittings are available on request.
* Note: Always check your system for leaks, before applying fluid/gas pressure. Especially if toxic, explosive or
other dangerous fluids are used.
2.7 Piping
BE SURE THAT PIPING IS ABSOLUTELY CLEAN!
DO NOT install small diameter piping on high flow rates, because the inlet jet-flow will affect the accuracy.
DO NOT mount abrupt angles direct on in- and outlet, especially not with high flow rates. We recommend at
least 20 pipe diameters distance between the angle and the instrument.
Special care should be taken in regard to reducers placed just in front of the mini CORI-FLOW. High pressure
drop and flow disturbance can occur which can influence the mini CORI-FLOW .
2.8 Electrical connections
Bronkhorst Cori-Tech B.V. recommends using their standard cables. These cables have the right connectors
and if loose ends are used, these will be marked to prevent wrong connection.
9.17.050 page 21
BRONKHORST CORI-TECH B.V.
2.9 Pressure testing
Each CORI-FLOW is pressure tested to at least 1.5 times the working pressure of the process conditions
stipulated by the customer, with a minimum of 8 bara.
The tested pressure is stated on the flow meter/controller with a RED COLOURED sticker. Check test
pressure before installing in the line.
If the sticker is not available or the test pressure is incorrect, the instrument should not be mounted in the
process line and be returned to the factory.
Each instrument is helium leak tested to at least 2⋅10
-9
mbar l/s Helium outboard.
2.10 Supply pressure
Do not apply pressure until electrical connections are made. W hen applying pressure to the system, take care
to avoid pressure shocks in the system and increase pressure gradually, especially on high pressure units
incorporating a piston operated control valve.
Make sure in case of a controller that the used valve can withstand the system pressure.
Give special attention to the maximum delta pressure of the valve.
2.11 System purging
If explosive gases are to be used, purge the process with inert dry gas like Nitrogen, Argon etc. for at least 30
minutes at a high enough flow.
In systems with corrosive or reactive fluids, purging with an inert gas is absolutely necessary, before taking in
use.
Preventing chemical reactions inside the tubes or instrument as this will tend to clog up or corrode the system.
Complete purging is also required to remove such fluids from the system before exposing the system to air. It
is preferred not to expose the system to air, when working with these corrosive fluids.
2.12 Seals
Bronkhorst Cori-Tech B.V. has gathered a material compatibility chart from a number of sources believed to be
reliable.
However, it is a general guide only. Operating conditions may substantially change the accuracy of this guide.
Therefore there is no liability for damages occurring from the use of this guide.
The customer’s application will demand its own specific design or test evaluation for optimum reliability.
So check if the seals like O-rings and plunger are correct for the process.
2.13 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, humidity, vibrations or shocks.
page 22 9.17.050
BRONKHORST CORI-TECH B.V.
2.14 Electromagnetic compatibility
Conditions for compliance with EMC requirements
All instruments described in this manual carry the CE-mark.
Therefore they have to comply with the EMC requirements, as they are valid for these instruments.
However compliance with the EMC requirements is not possible without the use of proper cables and
connector/gland assemblies.
For good results Bronkhorst Cori-Tech B.V. can provide standard cables. Otherwise follow the guidelines as
stated below.
1. Connector mini CORI-FLOW
Note:
When connecting the system to other devices (e.g. to PLC), be sure that the integrity of the shielding is not
affected. Do not use unshielded wire terminals.
1. For FLOW-BUS S(F)TP data (patch) cable connection to M12 connectors follow the instructions of the
supplier. It is important to use shielded twisted pair cables and shielded RJ45 modular jack connectors.
2. For PROFIBUS-DP, Modbus or DeviceNet data cable connections follow the instructions of the cable
suppliers for the specific field-bus system.
9.17.050 page 23
BRONKHORST CORI-TECH B.V.
2.15 Electro static discharge
This instrument contains electronic components that are susceptible to damage by static electric discharges.
Proper handling procedures must be taken during installation, removing and connecting the electronics.
3 OPERATION
3.1 General
The Bronkhorst Cori-Tech B.V. instruments are designed in such a way that they will meet user process
requirements in the best possible way.
The mini CORI-FLOW meters/controllers can be powered from +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 power 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.
Mini CORI-FLOW 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 on 38400 Baud)
3. FLOW-BUS
4. PROFIBUS-DP
5. DeviceNet
6. Modbus
7. other fieldbus interfaces on request
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 respond: 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 and operation can be done simultaneously without
problems. When changing a parameter value, the last value send by an interface will be valid.
Also the push-button switch and the LED’s on the left side 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.
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 stabilise. 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 Start-up
Turn on fluid supply gently. Avoid pressure shocks, and bring the instrument gradually up to the level of the
actual operating conditions. Also switch off fluid supply gently when shutting down.
page 24 9.17.050
BRONKHORST CORI-TECH B.V.
3.4 Zeroing
3.4.1 What is zero-stability ?
Due to mechanical construction of the sensor tubes each Coriolis sensor will have a very small offset signal,
even when the mass flow is zero. This is called the zero-stability error and is specified for accuracy separately
for all Coriolis instruments. Main reason for this is the fact that this error can be neutralized after performing a
zero-action.
Immediately after zeroing, zero-stability error is 0%. However it is allowed to move between a certain band
depending on the environment and fluid conditions.
In ideal situations where actual process conditions do not change, this error will remain the same.
Each time process conditions have been changed significantly a mini CORI-FLOW needs to be zeroed in order
to get rid of the offset error due to zero-stability. At least the very first time an instrument is used a zero
procedure will be required.
The zero-stability error might change when one or more of the following items change significantly:
Mainly:
• Temperature (of fluid and environment)
• Mounting position of instrument
Less important:
• Dynamic viscosity of fluid
• Vibrations working on instrument via environment
• Pulsation of supply pressure working on instrument
• Pressure
• Density of fluid
3.4.2 Procedure for zeroing
(See also Short form instruction manual mini CORI-FLOW, document nr. 9.17.052)
• Warm-up instrument for at least 30 minutes.
• Purge as long as needed with fluid to make sure there is no gas in the liquid or no condensate in the gas
• Fill instrument with fluid under process conditions.
• Close all valves at output to establish zero flow. Closing valves at input will not be critical (under
circumstances even better to let them open) but extra shut-off valves at output should be closed, as well as
control valve of instrument e.g. by means of setpoint = 0% or control mode = “close valve” .
• To start the zero procedure: Press push-button switch (#) on the side of the instrument and hold it (LED’s
will respond) until only the green LED is burning and then release the button.
This command is also possible via any available fieldbus- or RS232 interface.
• The zeroing procedure will start at that moment and can be monitored by the LED’s.
The green LED will blink until the procedure is ready. This will take about 30 seconds.
• When it is ready it will burn green continuously again.
3.4.3 Zero-procedure information
If the instrument has problems finding a proper and stable zero, it will repeat the auto-zero step a few times
(max. 4 times). Each time no proper zero can be achieved, the instrument will give a short notice signalling its
LED’s after the procedure.
The red and green LED will blink turn-by-turn for a few seconds to indicate that the auto-zero wasn’t able to
find a zero (because of too much noise in the signal). This is mostly the case when the instrument is placed in
a vibrating environment.
When ready zeroing after trying several (max. 4) times, the final result for the zero value will be a moving
average value of all attempts. The instrument will save this zero value into its non-volatile memory and will
keep this value until a next zero-procedure will be performed.
This value (Sensor Input Zero Scale Adjustment) can be accessed (read/written), via parameter 218 in the
parameter table of FlowDDE (note: Depending on firmware of instrument).
The mini CORI-FLOW will accept a proper zero only if the measured signal is within a limited noise band.
Best way to achieve this is to avoid external noise influences. However, when this is not possible, filter settings
of the mini CORI-FLOW can be changed to improve noise immunity.
Important:
Always make sure that there is absolutely no flow when the instrument is performing the (auto-)zero procedure
and there are no vibrations or pulsating inlet pressures.
9.17.050 page 25
BRONKHORST CORI-TECH B.V.
3.4.4 Alternatives for starting zero procedure
• Through FLOW-BUS, using an E-7000 readout/control module.
• Through FLOW-BUS, via a RS232/FLOW -BUS converter using software on a PC or PLC.
• Through RS232, using software on a PC or PLC
• Through RS232, using a Bright compact local readout/control module
• Through other fieldbus system (PROFIBUS-DP/DeviceNet/ModBus)
3.4.5 Zeroing with the Micro-switch
Before using the instrument zeroing is required.
• Set process conditions
After warm-up, pressure up and fill system including the mini CORI-FLOW
according to the process conditions.
• Stop flow
Make sure there is no flow through the instrument by closing the shut-off valves before and after the
instrument.
• Press and hold, until GREEN LED is on, than release button
With no flow, use the push-button switch (#) on the left side of the instrument to start the zero
adjustment procedure.
Press the push-button (#) and hold it, after a short time the red LED will go ON and OFF then the
green LED will go ON. At that moment release the push-button (#).
• Zeroing
The zeroing procedure will start at that moment and the green LED will blink fast. The zeroing
procedure waits for a stable signal and saves the zero. If the signal is not stable, zeroing will take long
and the nearest point to zero is accepted. The procedure will take approx. 25 sec.
Make sure that there is no flow through the instrument when performing the zeroing procedure.
• Ready
When indication is showing 0% signal and the green indication LED is continuously on, then zero has
been performed well.
3.4.6 Zeroing through the digital communication
It is also possible to start the zero adjustment procedure through the FLOW-BUS, using an E-7000
readout/control unit or a software program on a PC, connected to a FLOW-BUS interface module.
The following parameters must be used for zeroing an instrument:
Initreset
Cntrlmode
CalMode
• Set process conditions
Warm-up, pressure up the system and fill the instrument according to the process conditions.
• Stop flow
Make sure there is no flow through the instrument by closing the shut-off valves before and after the
instrument.
• Send parameters
Send the following values to the parameters in this sequence.
Initreset 64
Cntrlmode 9
Calmode 255
Calmode 0
Calmode 9
• Zeroing
The zeroing procedure will start at that moment and the green LED will blink fast. The zeroing
procedure waits for a stable signal and saves the zero. If the signal is not stable zeroing, will take long
and the nearest point to zero is accepted. The procedure will take approx. 25 sec.
Make sure there is no flow through the instrument when performing the zeroing procedure.
• Ready
When indication is showing 0% signal and the green indication LED is burning
continuously again, then zeroing has been performed well. Also parameter control mode
goes back to its original value. As last send 0 to parameter initreset.
[unsigned char, RW,0...255, DDEpar. = 7, Proces/par. = 0/10]
[unsigned char, RW,0...255, DDEpar. = 12, Proces/par. = 1/4]
[unsigned char, RW,0...255, DDEpar. = 58, Proces/par. = 115/1]
page 26 9.17.050
0V common
-
Current output signals
Sourcing
instrument
output I
+
mA
3.5 Operating conditions
Each instrument has been adjusted for customer process conditions, if possible.
Controllers or valves may not operate correctly, if process conditions vary too much, because of the restriction
of the orifice in the valve. Please change supply- or backpressure to improve control behaviour.
If this does not help, contact your local sales representative to assist you.
3.6 Manual operation
By means of manual operation of the push-button switch (#) some important actions for the instrument can be
selected/started. These options are available in both analog and BUS/digital operation modes.
(See also manual operation in document number 9.17.023)
These functions are:
- Reset (instrument firmware-program reset)
- Reset in case of an alarm
- Zeroing
- Restore factory settings (in case of unintentionally change of the settings)
for FLOW-BUS only:
- Automatic installation to FLOW-BUS (installs instrument to free address)
- Remote installation to FLOW-BUS (instruments will be installed by E-7000 or PC-software)
3.7 Analog operation
Digital instruments can be operated with analog signals through the 8-pin circular connector. The instruments
are compatible in use with analog instruments on this point.
Analog operated instruments, can be hooked up using an 8-wire shielded cable, connected according to the
Bronkhorst Cori-Tech standard.
Each electronic PC-board is set for one of the following output (and corresponding input) signals:
Signal output (sensor) input (setpoint)
code signal signal
A 0…5 Vdc 0…5 Vdc
B 0…10 Vdc 0…10 Vdc
F 0…20 mA (sourcing) 0…20 mA (sinking)
G 4…20 mA (sourcing) 4…20 mA (sinking)
For meters only the output signal is available.
At analog operation the following parameters are available:
- measured value
- setpoint (controllers only)
Note:
When operating the instrument through the analog interface it is possible to connect the instrument to any
supported fieldbus system (or RS232-interface with special cable) for reading/changing parameters (e.g.
controller response or other fluid selection).
For FLOW-BUS versions of the instruments a readout/control module for digital instruments can be temporarily
connected to the M12 fieldbus connector.
9.17.050 page 27
- valve voltage (controllers only)
BRONKHORST CORI-TECH B.V.
BRONKHORST CORI-TECH B.V.
3.8 BUS / digital operation
Operation via fieldbus reduces the amount of cables to build a system of several instruments and offers more
parameter values to be monitored/changed by the user.
See instruction manual: operating digital mass flow / pressure instruments for more details (document nr.
9.17.023).
Operation by means of a fieldbus adds a lot of extra features (compared to analog operation) to the
instruments.
Such as:
- adjustable filter settings to smoothen or speed-up the output signal
- setpoint slope (ramp function on setpoint for smooth control)
- adjustment of controller output (response time) for valve or pump control (PID-settings)
- direct reading at readout/control module or host computer
- testing and self diagnosis
- response alarm (setpoint-measure too high for too long time)
- several control/setpoint modes (e.g. purge/close valve)
- master/slave modes for ratio control (FLOW -BUS only)
- identification (serial number, model number, device type, user tag)
- adjustable minimal and maximal alarm limits
- (batch) counter
- adjustable response time for controller when opening from zero
- adjustable response time for normal control
- adjustable response time for stable control (|setpoint-measure| < 2%)
Special software like FlowDDE, FlowPlot and FlowView can be used to control these settings.
For operation of digital instruments by means of a specific fieldbus system or RS232, see following documents
(available as PDF-file):
• for FLOW-BUS document number: 9.17.024
• for PROFIBUS-DP document number: 9.17.025
• for DeviceNet document number: 9.17.026
• for RS232 document number 9.17.027
• for Modbus document number 9.17.035
page 28 9.17.050
BRONKHORST CORI-TECH B.V.
3.9 RS232 communication cable T-part
Note:
Special RS232 cable has partnr. 7.03.444 and consists of a T-part with 1 male and 1 female 8-pin DIN
connector on one instrument-side and a normal female sub-D 9 connector on the side of the computer.
By means of this cable it is possible to offer RS232 communication and still be able to connect power-supply
and analog interface through the (analog) 8-pin DIN connector.
RS232 communication is only possible with a baudrate of 38.4 KBaud and can be used for either:
• Uploading new firmware by means of a special program (for trained Bronkhorst-service personnel only)
• Servicing your instrument using Bronkhorst-service programs (for trained Bronkhorst-service personnel
only)
• Operating your instrument using FLOW DDE, FLOWB32.DLL or RS232-ASCII protocol (end user)
9.17.050 page 29
BRONKHORST CORI-TECH B.V.
4 MAINTENANCE
4.1 General
No routine maintenance is required to be performed on the meters or controllers. In case of severe
contamination it may be required to clean the valve orifice separately.
4.2 mini CORI-FLOW sensor
The mini CORI-FLOW sensor is constructed in such a way that there is very little dead volume.
The sensor is maintenance free.
4.3 Controllers
All sensor types can be combined with a control valve to be operated together as a control loop. Controller
systems are either available as separate units; a sensor and a control valve, or as an integrated unit.
If applicable maintenance procedures are described under “control valves”
4.4 Control valves
Control valves cannot be used for shut-off and/or on-off applications. Pressure surges, as may occur during
system pressurisation or deflation must be avoided.
4.4.1 Solenoid valves
These are considered to be the directly operated control and pilot valves. They can be disassembled in the
field by the user for cleaning and servicing. The parts can be cleaned with a cleaning liquid, or in an ultrasonic
bath.
To disassemble the valve proceed as follows:
a) disconnect the instrument connector (not necessary with separate valve)
b) remove the hex nut on top of the valve assembly
c) lift the cover (coil) assembly
d) unscrew the flange
e) lift valve assembly carefully from the base
f) unscrew set screw for the orifice and subsequently loosen the orifice and the orifice holder
g) remove the plunger assembly
Clean parts and carefully re-assemble in reverse order. It is recommended to replace the O-rings prior to reassembly.
After having re-assembled the control valve, it is recommended to check the control characteristics of the
valve. This can best be done by using a separate variable 15 Vdc power supply source.
Proceed as follows:
- disconnect the valve leads and connect to supply source
- apply gas pressure as per working conditions
- apply power by gradually increasing voltage
- the valve should open at 7 Vdc ± 3 Vdc
- the fully opened position is reached at approx. 9 Vdc ± 1.5 Vdc.
In case the valve does not operate within the voltage levels stated, then it must be disassembled, and the
orifice must be adjusted to the proper position.
Re-assemble valve and repeat procedure if required.
4.4.2 Vary-P valve
The vary-P valve is designed to cope with extremely varying process conditions on either upstream or
downstream side of the valve or a combination of these. ∆p can vary over a wide range. The basic control
valve is a direct operated solenoid control valve.
The design has been patented.
For orifice selection and maintenance other than the pilot valve consult the factory.
page 30 9.17.050
BRONKHORST CORI-TECH B.V.
2
514 p
p
T
K
n
n
m
v
⋅∆
⋅
⋅
Φ
=
ρ
ρ
T
p
K
n
n
m
v
⋅
⋅⋅
Φ
=
ρ
ρ
1
257
K
v
4.4.3 Pilot operated valve
This control valve is an indirect control valve, consisting of a spring loaded membrane/orifice system which is
positioned by a solenoid operated direct control (pilot valve). The two devices are integrated in one block.
Basically follow the same procedures for dis-assembly as stipulated under “Solenoid valves”
For cleaning purposes it may be required to dis-assemble further, i.e. also remove the membrane assembly.
For pilot operated valves the maximum pressure drop is limited to 20 bard. If the pressure drop during start-up
is higher, it is preferred to install a bypass valve. During start-up this valve should be opened. Also the
minimum pressure drop is limited. For exact figures consult factory or proceed according to the technical data
and/or additional instructions given by the sales office or department.
Note:
When pressure testing a system incorporating a pilot operated control valve, a special procedure must be
followed in order to prevent damage to the valve. In such cases it is necessary to contact the factory prior to do
this.
4.5 Kv-value calculation
This calculation method can be used to determine the K
-value of the main orifice of a control valve.
v
4.5.1 For gases
Determine desired ∆p across valve.
∆p must be at least 20% of supply pressure, or in closed loop systems, of total pressure difference in the loop.
If ∆p is 20-50% of supply pressure, use formula:
If ∆P is 50-100% of supply pressure, use formula:
Units:
= flow [kg/h]
Φ
m
= supply pressure [bara]
p
1
= downstream pressure [bara]
p
2
∆p = pressure difference (p
T = temperature [K]
= density [kg/m
ρ
n
3
]
n
- p2) [bara]
1
The orifice diameter can be determined by: d= 7.6
under critical
over critical
[mm]
9.17.050 page 31
BRONKHORST CORI-TECH B.V.
1000p
K
m
v
⋅∆
Φ
=
ρ
ρ
)/h(kg
m
Φ
ρ
(kg / m ) at 20 C
3
∆p(bard)
d 7.6 K
v
=
Φ Φ
v 2 v
2
H O = customer
customer
H O
ρ
ρ
Φ
v
ρ
10
4
10
3
10
1
10
-1
10
1
10
0
10
4
10
3
10
2
10
1
P ( b a r)
d = 0.1 m m
d = 0.37 m m
d = 0.3 m m
d = 0.2 m m
d = 0.14 m m
10
2
10
0
10
-2
O
H O (ml/h)
2
10
-1
10
1
10
0
d = 1.0 m m d = 0.7 m m
d = 0.5 m m
P m a x.
v
4.5.2 For Liquids
Determine desired ∆p across valve.
∆p must be at least 50% of supply pressure
Kv-value calculation
Units: flow -
density -
delta p -
and 1 atm.
The orifice bore diameter can be determined by:
[mm]
For C2 type of valves the diameter of the orifice can be calculated as shown above or looked up in the graph
below.
in which:
= volume flow
= density
If liquids have viscosity’s >15 mPa.s (water = 1 mPa.s), the flat orifice and plunger type control mechanism
cannot be used. For measuring systems only check maximum possible viscosity with factory.
page 32 9.17.050
BRONKHORST CORI-TECH B.V.
G: 4…20mA analog input and output
Capacity (FS) = 150 g/h Mix
4.6 Calibration procedure
All instruments are factory calibrated on all possible ranges, independent of customer conditions.
Calibration will be performed with water under normal temperature and atmospheric conditions (20°C and 1
bara). After calibration the instruments will be dried thoroughly.
Instruments will be calibrated using water on 6 points over the full flow range where the instrument can be used
for. Because Coriolis instruments measure mass flow, they will have the same accuracy for all fluids and
therefore calibrations on actual fluids will not be necessary.
Also density will be calibrated and calibration checks on air will be performed.
For the flow calibration, the instrument will be set to the maximum full scale value and seven points (including
zero) will be compared with a reference. All points will be shown in a graph to illustrate that they are within
limits of total accuracy (±0.2% ±Zero Stability).
After this calibration, the actual capacity (full scale) value will be set to the wanted flow value ordered by the
enduser. This value can be easily changed on site by the enduser using Bronkhorst tooling software (FlowDDE
and FlowPlot) which can be downloaded from the website: http://downloads.bronkhorst.com/
Thus re-ranging the instrument will be possible between a minimum and a maximum capacity. Over this
complete range the instrument calibration certificate will be valid.
Analog outputs (A: 0…5Vdc /B: 0…10Vdc /F: 0…20mA /G: 4…20mA) for flow and analog inputs for giving
setpoints to controllers, will be adjusted as ordered. These adjustments include an extra uncertainty of < ±0.1%
at each input as well as at each output.
The analog output and -input maximum values are equal to the actual capacity (full scale) value of the
instrument and will be linear to the flow.
If the instrument will be re-ranged: actual capacity will be set to another value, this analog value will get another
meaning.
The original, factory set, actual capacity (full scale) value and type of analog signal will be displayed on the grey
sticker on the instrument. This will be the value what the instrument had been ordered for.
Example:
M13 instrument has a maximum flow of max. 2000 g/h.
It will be calibrated up to 2000 g/h on 7 points, including zero.
Enduser wants to use it with 4…20 mA and orders the instrument for 150 g/h.
When the instrument leaves the factory 20mA will correspond with 150 g/h.
After re-ranging it to a full scale of 500 g/h, 20mA will correspond with 500 g/h Mix.
After re-ranging it to a full scale of 2000 g/h, 20mA wil correspond with 2000 g/h.
Note:
The fluidname “Mix” is just indicative for actual use. However, the meter will measure all fluids with same
accuracy as long as the instrument is capable of handling the fluid (pressure drop, corrosion resistance,
suitability of valve or pump etc.).
.
9.17.050 page 33
BRONKHORST CORI-TECH B.V.
4.7 Instrument re-ranging
Re-ranging can easily be performed by changing the capacity of the instrument. This can be performed by
using FlowPlot, E-7000 or Bright readout/control module, RS232 digital communication or any available
fieldbus communication interface supporting parameter 21: capacity. Capacity can be set between minimum
capacity and maximum capacity. The actual values depend on the type of instrument.
FlowPlot can be downloaded at: http://downloads.bronkhorst.com
Example of changing flow range using FlowPlot:
Enter max flow range here (capacity) or move the slider.
4.8 Instrument filter settings
Changing filter settings can be done using FlowPlot.
FlowPlot can be downloaded at: http://downloads.bronkhorst.com
Output filter:
Dynamic display factor and Static display factor are filter settings for readout only (at analog output and digital
output). Output signal filtering at stable situation and at a flow-step can be set separately.
Sensor filter:
Exponential smoothing factor is the most important filter parameter to influence the stability of the meter and
will also influence the controller behaviour, where it will be provided as input for the controller.
Adaptive smoothing factor does not have functionality for a mini CORI-FLOW. For a mini CORI-FLOW it will
temporarily switch off the filter during a flow-step to enable fast controller behaviour together with strong
filtering.
For all filter settings:
A value can be entered between 0 and 1, where values close to 0 will filter strongly and slow down the output.
A value close to 1 will speed-up the output and will introduce more noise.
At value = 0, the filter has been switched off. No signal is put-through: no signal changing.
At value = 1, the output is equal to the input: no filtering at all.
page 34 9.17.050
BRONKHORST CORI-TECH B.V.
5 INTERFACE DESCRIPTION
For a description of the available interfaces see document numbers:
9.17.024 for FLOW-BUS
9.17.025 for PROFIBUS-DP
9.17.026 for DeviceNet
9.17.027 for RS232
9.17.035 for Modbus
These documents are available as PDF on the documentation/software tool CD.
6 TROUBLESHOOTING
6.1 General
For a correct analysis of the proper operation of a mini CORI-FLOW meter or controller it is recommended to
remove the unit from the process line and check it without applying fluid supply pressure. In case the unit is
dirty, this can be ascertained immediately by loosening the compression type couplings and, if applicable the
flange on the inlet side.
Energising or de-energising of the instrument indicates whether there is an electronic failure. W hen powering
up the red LED is on and the green LED is flashing for a second or two. Then the instrument should go in
normal operation mode. See document number 9.17.023 for detailed description of the LED indication.
After that, fluid pressure is to be applied in order to check behaviour.
6.2 Calibration check
In case of checking the instrument for correct calibration, the only proper way to do this is to use a weighing
scale with correct accuracy. Alternatively another Coriolis instrument might be used as a reference.
However, volumetric flow meters should not be used as a reference.
The integrated totalizer of the instrument can be used to compare a batch of flow during several minutes to a
weighing scale.
The easiest way is to fill a cup, e.g. with water for 2 minutes or more.
To activate and zero the totalizer, FlowPlot and FlowDDE can be used, to be downloaded at
http://downloads.bronkhorst.com/
Alternatively a Bright module or E-7000-Digital could be used to operate the counter for a mini CORI-FLOW.
For this check, proceed as follows:
- put an empty cup on the weighing scale
- zero the scale with the empty cup on the scale
- reset the totalizer of the mini CORI-FLOW before filling the cup
- make sure the inlet pressure is stable and sufficient for proper control and correct flow rate
- in case of a controller: give a setpoint to open the valve
- in case of a meter, open a manual valve with correct inlet pressure
- fill the cup during at least 2 minutes and stop the flow
(Totalizer can be used as batch controller to dose a certain batch within a certain time in case of controller)
- compare the totalizer value to the value indicated by a weighing scale.
- make sure you understand the total acceptable error = reading accuracy (0.2% for a liquid) ± zero stability
as explained in paragraph 1.5
NOTE: This method should be used only to get a quick impression about the calibration of the instrument.
Please understand that performing an accurate calibration requires knowledge and optimal control of many
parameters involved, such as: pressure, temperature, time-measurement, evaporation of liquid, mounting
position of weighing scale, tubing and flow.
.
9.17.050 page 35
BRONKHORST CORI-TECH B.V.
Symptom
Possible cause
Action
Red LED is irregular or
Gas bubbles in tube (of liquid meter)
Purge to get rid of gas bubbles
to detect if gas or liquid is in the tube.
Too much vibrations
Mount isolation rubbers and flexible tubing.
Red LED is continuously on
Hardware error
Have instrument checked by specialist
Wanted flow is not reached
Clogging of the instrument
Purge at outlet and/or inlet with dry air if
or using CoriCalc pressure calculations.
No output signal
No power supply
1a) check power supply
1b) check cable connection
Output stage damaged due to long lasting
shortage and/or high-voltage peaks
1c) return to factory
Supply pressure too low, or differential pressure
across meter too low
1d) increase supply pressure
Valve blocked/contaminated
1e) connect 0 .. 15 Vdc to valve and slowly
personnel only)
Piping or filters blocked
1f) clean system
Sensor failure
1g) return to factory
Maximum output signal
Output stage damaged
2a) return to factory
Sensor failure
2b) return to factory
Output signal much lower than
Piping or filters blocked/contaminated
3a) clean system
sensor blocked/contaminated
3b) clean sensor with a gas or fluid
Valve blocked/contaminated
3c) clean valve
Valve internal damage (swollen seat in plunger)
3d) replace plunger assembly and adjust valve
or return
Incorrect type of gas is used and/or
pressure/diff. pressure is to low
3e) try instrument on conditions for which it was
designed
Flow is gradually decreasing
NH
3
C H ,C H
3 8 4 10
4a) decrease supply pressure and/or heat gas
Valve adjustment has changed
4b) see ‘1e’
Oscillation
Supply pressure/diff. pressure too high
5a) lower pressure
Pipeline too short between pressure regulator
5b) increase length or diameter of piping
CORI-FLOW
External vibration is present
5c) Remove external vibration
Valve sleeve or internals damaged
5d) replace damaged parts and adjust valve,
see ‘1e’ or return to factory
Controller adjustment wrong
5e) adjust controller
this. Please contact the distributor for details.
Unstable upstream pressure
Small flow at zero setpoint
Valve leaks due to damaged plunger or dirt in
orifice
6a) clean orifice and/or, when replacing plunger
assembly, see ‘1e’
Pressure too high or much too low
6b) apply correct pressure
Zero procedure not done or with gas in the tube
6c) Purge and Zero the instrument
High flow at zero setpoint
Damaged diaphragm (only applicable to valves
with membrane)
7a) replace membrane seal
Zero procedure not done or with gas in the tube
7b) Purge and Zero the instrument
Disturbances in the flow
Gas in the system
8a) Purge the system
Expansion of liquids to gasses
8b) Check properties fluid used
to detect if gas or liquid is in the tube
Calibration error
Zero procedure not done or with gas in the tube
9a) Purge and Zero the instrument
Gas in the system
9b) Purge the system
Measure time to short
9c) Measure long enough to get a reliable
measurement
Right reference instrument
9d) The mini CORI-FLOW is a mass-flow
a volume-meter.
Totalization error
Pulsating or fast changing flow
Used special CORI-FILL (> 8V16) firmware
(Use dampener to stabilize inlet pressure.)
6.3 Troubleshooting summary general
continuously on.
setpoint signal or desired flow
Advise: use frequency and/or density signal
possible and compare max flow with fixed inlet
pressure to values in the table of the brochure
increase voltage while supply pressure is ‘on’.
The valve should open at 7V ± 3V; if not open,
then clean parts and adjust valve (qualified
Condensation, occurs with
such as
and mini CORI-FLOW
etc.
, hydrocarbons
to be measured
upstream
Increase between pressure regulator and mini
Software like FLOWPLOT can be used to do
Advise: use frequency and/or density signal
Note: For other (more specific) problems see also troubleshooting parts in other documents.
page 36 9.17.050
meter/controller and should not be checked with
specially optimized for totalizing flow.
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