BRONKHORST IQ+Flow series User manual

Instruction manual
IQ+FLOW®series
Digital Mass Flow / Pressure
Controllers for gases
Doc. no.: 9.17.045L Date: 07-01-2013
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.

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Disclaimer
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 High-Tech B.V.
January 2013
Symbols
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.
Additional info available on the internet or from your local sales representative.
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.
Before installing an IQ+FLOW® instrument it is important to read the attached labels and check:
- Instrument type
- Flow rate
- Fluid to be measured/controlled
- Up- and downstream pressure
- Input and output signal
- Temperature
Do not discard spare or replacement parts with the packing material and inspect the contents for
damaged or missing parts.
Refer to chapter 6 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.

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Warranty
The products of Bronkhorst High-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 warranteed for one year or the balance of the original warranty, whichever is the longer.
See also paragraph 9 of the Conditions of sales:
http://www.bronkhorst.com/files/corporate_headquarters/sales_conditions/en_general_terms_of_sales.pdf
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 hookup, physical
shock etc.
Re-conditioning of products primarily returned for warranty service that is partly or wholly judged non-warranty may
be charged for.
Bronkhorst High-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
High-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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Table of Contents
Disclaimer ....................................................................................................................................................................... 2
Symbols........................................................................................................................................................................... 2
Receipt of equipment ..................................................................................................................................................... 2
Equipment storage ......................................................................................................................................................... 2
Warranty......................................................................................................................................................................... 3
1. Scope of this manual ..................................................................................................................................... 5
1.1 Introduction........................................................................................................................................................ 5
1.2 References to other applicable documents ........................................................................................................ 5
2. Starting up ....................................................................................................................................................... 6
2.1 Check properties ................................................................................................................................................. 6
2.2 Rated pressure test inspection ........................................................................................................................... 6
2.3 Check piping........................................................................................................................................................ 6
2.4 Install system ...................................................................................................................................................... 6
2.5 Leak check........................................................................................................................................................... 7
2.6Electrical connection........................................................................................................................................... 7
2.7 Analog / digital operation ................................................................................................................................... 8
2.8 Multi-functional switch operation ...................................................................................................................... 8
2.9 Purging ................................................................................................................................................................ 8
2.10 Zeroing ................................................................................................................................................................ 9
2.11 Calibration........................................................................................................................................................... 9
2.12 Supply pressure................................................................................................................................................... 9
2.13 Product description .......................................................................................................................................... 10
2.14 Model key ......................................................................................................................................................... 10
3. Basic operation ..............................................................................................................................................11
3.1 General ............................................................................................................................................................. 11
3.2 Analog operation .............................................................................................................................................. 11
3.3 Manual interface: micro-switch, LEDs and rotary switches.............................................................................. 12
3.3.1 Micro-switch operation (single-channel versions only) .................................................................................. 12
3.3.2 LED functions .................................................................................................................................................. 13
3.3.3 Rotary switch operation (multi-channel versions only) .................................................................................. 13
3.4 Basic RS232 operation ...................................................................................................................................... 14
3.5 Basic RS485 operation ...................................................................................................................................... 16
3.6 Basic parameters and properties ...................................................................................................................... 18
3.6.1 Introduction..................................................................................................................................................... 18
3.6.2 Basic measurement and control parameters................................................................................................... 19
3.6.3 Basic identification parameters ....................................................................................................................... 19
4. Advanced operation ......................................................................................................................................20
4.1 Reading and changing instrument parameters................................................................................................. 20
4.1.1 Special parameters .......................................................................................................................................... 20
4.1.2 Identification.................................................................................................................................................... 21
4.1.3 Fluid information ............................................................................................................................................. 21
4.1.4 Advanced measurement and control parameters........................................................................................... 22
4.1.5 Controller parameters ..................................................................................................................................... 22
4.1.6 Display filter ..................................................................................................................................................... 23
4.1.7 Alarm / Status parameters............................................................................................................................... 24
4.1.8 Counter parameters......................................................................................................................................... 24
4.2 Special instrument features .............................................................................................................................. 25
4.2.1 Auto zeroing..................................................................................................................................................... 25
4.2.2 Changing default control mode ....................................................................................................................... 25
4.2.3 Disabling micro switch (single-channel versions only)..................................................................................... 26
4.2.4 Setting digital output (multi-channel versions only)........................................................................................ 26
5. Troubleshooting and service.......................................................................................................................27
5.1 General ............................................................................................................................................................. 27
5.2 LED indication ................................................................................................................................................... 27
5.3 Troubleshooting summary general................................................................................................................... 27
5.4 Service............................................................................................................................................................... 28
6. Removal and return instructions ................................................................................................................28

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1. Scope of this manual
1.1 Introduction
This manual covers the IQ+FLOW® series mass flow/pressure meters/controllers for gases. Examples of the
instrument series are shown in the pictures below. This manual includes product information, installation
instructions, operation, maintainance and troubleshouting.
IQ+FLOW® digital mass flow/pressure meters and controllers for gases are one of the smallest chip based instruments
of its kind. IQ+FLOW® mass flow meters/controllers can be applied for measuring and fast control of gas flows up to
5000 mln/min, for applications with pressure conditions up to 10 bar (145 psi) and temperatures between 5 to 50 °C
(41 to 122 °F). IQ+FLOW® pressure meters/controllers can be applied for pressure ranges from 0,01…0,5 bar up to
0,2…10 bar. The instruments can either be operated in analog or digital mode (RS232 or RS485).
1.2 References to other applicable documents
Instructions:
-IQ+FLOW® Quick Installation Guide (document nr. 9.17.074)
-Operation instructions digital instruments (document nr. 9.17.023)
-RS232 interface with FLOW-BUS for digital instruments (document nr. 9.17.027)
-Modbus slave interface for digital Mass Flow / Pressure instruments (document nr. 9.17.035)
Technical drawings :
-Hook-up diagram IQ+FLOW® RS232/RS485 + Analog I/O (document nr. 9.16.101)
-Hook-up diagram IQ+FLOW® Manifold (multi-channel) (document nr. 9.16.090)
-Dimensional drawing IQF/IQP (document nr. 7.05.545)
-Dimensional drawing IQFD/IQPD (document nr. 7.05.656)
-Dimensional drawing IQM (document nr. 7.05.760)
These documents are available on:http://www.bronkhorst.com/en/downloads
or can be applied for at our local sales & service representatives

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2. Starting up
2.1 Check properties
Before installing it is important to read the attached label and check:
- Instrument type:
• gas (IQF) red label or
• pressure (IQP) yellow label
- Flow rate
- Fluid to be measured / controlled
- Up- and downstream pressure
- Input and output signals
- Temperature
IQ+FLOW® instruments are designed for dry, clean, inert and non-explosive gases. Do not use the
instruments for gases that do not belong to this category.
2.2 Rated pressure test inspection
The tested pressure is stated on the instrument with a red-coloured
sticker. Before installation, make sure that the test pressure is in
accordance with normal safety factors for your application.
If there is no Pressure Testing Sticker on the device or if the test
pressure is incorrect, the instrument should not be mounted in the
process line and be returned to the factory.
2.3 Check piping
For reliable measurement always make sure that the fluid stream is
clean. Use filters to ensure a clean, moisture- and oil- free gas stream.
Recommended pore-size: 7 µm. If back flow can occur, a downstream
filter is recommended too. Be aware of the pressure drop caused by
using filters.
2.4 Install system
For IQ+FLOW® the upright position is preferred. When using an
IQ+FLOW® instrument in up- or downward position make sure to
“zero” the instrument prior to use (see section 2.10). Avoid
installation in close proximity of mechanic vibration and/or heat
sources. The housing of the instrument is according to class IP40,
which means that the instrument is suitable for indoor (dry)
applications, like laboratories or well protected (OEM) housings.
Install the IQ+FLOW® instrument in the line, in accordance with the
direction of the FLOW arrow. The arrow for flow direction is
indicated on the body of the instrument. If applicable follow the
guidelines of the supplier of the fittings. Special types of fittings are
available on request.
IQ(F/M)
- Gas Flow IQP - Pressure
10

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Compression type fittings
For leak tight installation of compression type fittings make sure that the tube is inserted up to the
shoulder in the fitting body and that no dirt or dust is present on tube, ferrules or fittings. Tighten the
nut finger tight; while holding the instrument, then tighten the nut one turn.
10-32 UNF fittings
Tighten the 10-32 UNF fittings according to the instructions
of the supplier of the fittings.
Only use 1/16” tubing with a straight and clean cut without
burrs to ensure leak tightness. Preferably deburr the tubing
prior to installation. A new ferrule connection must be made
for each new adapter to ensure leak-tightness and minimum
dead volume, due to variances in the adapter dimensions.
Mounting downported instruments
For downported instruments make sure that the seals are present at the bottom, that the surfaces are
undamaged and that they are dry and free from dirt or dust.
2.5 Leak check
Check the system for leaks before applying pressure. Especially if toxic, explosive or other dangerous fluids
are used!
2.6 Electrical connection
Electrical connections must be made with a standard cable or according to the IQ+FLOW® hook-up
diagram. Several hook-up examples and standard cables are found in chapter 3.
IQ
+
FLOW® instruments are powered with +15…+24 Vdc.
Electrical connections must be made with standard cables or according to the applicable hook-up
diagrams. These documents can be found at: http://www.bronkhorst.com/en/downloads
The instruments contain electronic components that are susceptible to damage by electrostatic discharge.
Proper handling procedures must be taken during installation, removing and connecting the electronics.
The instruments described in this manual carry the CE-mark and are complient with the EMC
requirements. However compliance with the EMC requirements is not possible without the
use of proper cables and connector/gland assemblies. Bronkhorst High-Tech B.V. recommends the use of
their standard cables. These cables have the right connectors and if loose ends are used, these will be
marked to prevent wrong connection. When using other cables, cable wire diameters should be sufficient
to carry the supply current and voltage losses must be kept as low as possible. When in doubt: contact
your distributor.
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.

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2.7 Analog / digital operation
Analog operation (single channel versions only)
For analog operation refer to the “Hook-up diagram IQ+FLOW®” or
use an RJ45 loose-end cable (7.03.419) to connect the required
signals.
Digital RS232 operation
Digital operation over RS232 can be
established when using the following setup.
Using a RS232 cable or a USB-RS232 conver-
ter with a PC will allow you to use (free)
Bronkhorst® software for Windows, such as
FlowDDE and FlowPlot. See also section 3.4.
Digital RS485 operation
With digital operation over RS485 a bus-system with multiple instruments can be set up. See section
3.5 for possible systems.
2.8 Multi-functional switch operation
Micro-switch operation (single channel versions only)
Using the micro-switch on the instruments, several actions can
be monitored and started. The green LED is used for status
indication. The red LED is used for errors/warnings/messages.
The micro-switch can be used to start several actions, such as
auto-zero, restore factory settings and bus-initialisation actions,
if applicable. See specific zero-procedure below and section 3.3
for more details.
Rotary switch operation (multi-channel versions only)
Select the communication type and Baud rate with the
“COMM. TYPE” switch. Select the node address with the
“MSD” and “LSD” switch (e.g. MSD = 1 and LSD = 9 selects
node 19 for channel 1, but also node 20 and 21 for channels
2 and 3). See section 3.3 for more details.
2.9 Purging
Do not apply pressure until electrical connections are made. When applying pressure to the system, avoid
pressure shocks in the system and increase pressure gradually. Also decrease pressure gradually when
required.
In systems for use with toxic or other dangerous fluids, purging for at least 30 minutes with a dry, inert gas
(like Nitrogen or Argon) is absolutely necessary before use. After use with toxic or other dangerous fluids,
complete purging is also required before exposing the system to air.
Power:
+15...+24 Vdc
Analog output:
0…5Vdc / 0…10Vdc
0…20mA / 4…20mA
Multi-functional switch
Status LED
Error/Warning LED

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Warm-up time
Let the IQ+FLOW® warm-up for at least 30 minutes for best accuracy.
2.10 Zeroing
The zero point of each instrument is factory adjusted. If required the zero point can be re-adjusted over
RS232 or by means of using the micro-switch. Procedure for zeroing by-micro switch (not for pressure
meter/controller):
-Warm-up, pressure up the system and fill the instrument according to the process conditions.
-Make sure no flow is going through the instrument by closing valves near the instrument.
-The setpoint must be zero.
-Press micro-switch 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 micro-switch.
-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 approximately 10 seconds.
-When the indication is showing 0% signal and the green indication LED is burning continuously
again, the zeroing action was successful.
2.11 Calibration
Each IQ+FLOW® instrument is factory calibrated. Bronkhorst High-Tech B.V. certifies that all instruments
meet the rated accuracy. Calibration is performed using measurement standards traceable to the
standards of the Dutch Metrology Institute (VSL). Calibration certificates are included in the shipment.
When operated properly (clean gas, no pressure shocks, no vibrations, no thermal shocks, etc.), regular
maintenance is not required. However, periodical inspection, recalibration or verification of the
accuracy may be subject to individual requirements of the end-user.
2.12 Supply pressure
It is recommended to turn on power before applying pressure on the instrument and to switch off power
after removing pressure.
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.

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2.13 Product description
The IQ+FLOW® series is one of the smallest mass flow sensors of its kind. Due to the use of micro system technology,
ultra compact flow controllers are realised with dimensions of only 20 x 40 x 60 mm. The (IQF) flow controllers are
able to measure and control flow rates of 10 mln/min full scale (FS) up to 5000 mln/min FS. The (IQP) pressure
controllers are available in ranges from 0.5 to 10 bar FS. The IQ+FLOW® series has a modular concept with
combinations of 20 mm footprint modules, available as single instruments, but also as multiple channel arrangements.
A very compact manifold (IQM) system can be constructed, with one multi-channel digital pc-board (per 3 channels) in
a single housing, optionally available with filters and/or shut-off valves.
Communication with the devices can be either in analog mode or digital over RS232 or RS485. Communication over
RS232 is established with the Propar (FLOW-BUS) protocol. With digital operation over RS485 a bus-system with
multiple instruments can be set up. Modbus RTU/ASCII and FLOW-BUS protocols are supported (some exceptions for
multi-channel versions, see section 3).
2.14 Model key

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3. Basic operation
3.1 General
An IQ+FLOW® instrument must be powered with +15…+24 Vdc according to the applicable hook-up diagram, supplied
with the instrument. The instrument can be operated by means of:
•Analog interface: 0…5 Vdc; 0…10 Vdc; 0…20 mA or 4…20 mA (single-channel versions only)
•Digital RS232 interface (FLOW-BUS (Propar) protocol)
•Digital RS485 interface (Modbus RTU, Modbus ASCII or FLOW-BUS protocols)
By default the instrument is set as specified. The table below lists the supported interfaces for single-channel and
multi-channel versions.
Analog interface
(section 3.2)
Digital RS232 interface
(section 3.4)
Digital RS485 interface
(section 3.5)
IQF/IQP
(single-
channel)
0…5 Vdc; 0…10 Vdc;
0…20 mA; 4…20 mA
(software selectable)
FLOW-BUS (Propar) protocol
on 9600, 19200, 38400, 57600 or 115200
Baud (software selectable)
Modbus RTU and Modbus ASCII protocols
on 9600, 19200, 38400, 57600 or 115200
Baud; FLOW-BUS protocol on 187500 or
400000 Baud (software selectable)
IQM
(multi-
channel)
Not supported
FLOW-BUS (Propar) protocol on 38400 or
115200 Baud (select with rotary switch)
Modbus RTU protocol on 9600, 19200 or
38400 Baud (select with rotary switch)
3.2 Analog operation
Analog operation is only possible with single-channel IQ+FLOW® instruments. Multi-channel instruments can only be
operated digitally. At analog operation the following signals are available:
•Measured value (analog output) at pin 2
•Setpoint (analog input/setpoint) at pin 3
The valve output is no longer available as analog signal with IQ+FLOW®. The selected analog interface (0…5 Vdc; 0…10
Vdc; 0…20 mA or 4…20 mA) can be found in the model key of the instrument. Refer to paragraph 2.14.
When operating the instrument through the analog interface it is possible to connect the instrument
simultaneously to RS232 for reading/changing parameters (e.g. settings or fluid selection).
Hook-up
For analog operation either an RJ-45 loose-end cable or an RJ-45 to 9-pin sub-D converter may be used to connect
the required signals.
Refer to the “Hook-up diagram IQ+FLOW®” or use an
RJ-45 loose-end cable (7.03.419) to connect the required
signals.
When using a Bronkhorst readout unit use only an RJ-45
cable (7.03.236) in combination with the RJ-45 to 9-pin sub-D
converter (7.03.376). With these items the pin configuration
is unchanged.

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3.3 Manual interface: micro-switch, LEDs and rotary switches
In this section the manual instrument interfaces are described. In section 3.3.1 the micro-switch operation is discussed
(if present), section 3.3.2 specifies the LED functionality and in section 3.3.3 the rotary switch operation is described.
3.3.1 Micro-switch operation (single-channel versions only)
By means of manual operation of the micro push-button switch some important actions for the instrument can be
selected or started. These options are available in both analog and digital operation mode.
These functions are:
•Reset alarm
•Reset instrument (firmware program reset)
•Auto-zeroing
•Restore factory settings (in case of accidently changing of the settings)
Using digital RS232 or RS485 operation it is also possible to set:
•Bus-address (only required for RS485)
•Baudrate
The tables below describe the micro-switch functions that can be started in respectively normal operation mode and
during power-up:
LEDs
Time
Pushed
Indication


 Green


 Red
Off
Off
0 – 1 sec
No action. Pressing a switch shortly by accident will not
start any unwanted reaction of instrument.
Pressing the switch 3x briefly with intervals of max. 1 sec.
forces the instrument to indicate its bus-address/MAC-ID
and baud rate. Check chapter 3.5 for more details.
Off
Off
1 – 4 sec
In case of min/max alarm or counter batch reached:
Reset alarm (only if reset by keyboard has been enabled)
For FLOW-BUS only: if the node address is occupied, this
function will install a free node-address on FLOW-BUS.
Off
On
4 – 8 sec
Reset instrument
Instrument program will be restarted and all warning and
error messages will be cleared. During start-up the
instrument will perform a (new) self-test.
On
Off
8 – 12 sec
Auto-zero
Instrument will be re-adjusted for measurement of zero-
flow (not for pressure meter/controller). See section 2.10.
On
On
12 – 16 sec
Prepare instrument for FLASH mode for firmware update.
Instrument shuts down and both LEDs turn off.
At next power-up instrument will be active again.
LED indications using micro-switch at normal operation mode of an instrument
LEDs
Time
Pushed
Indication


 Green


 Red
Off
Off
0 – 4 sec
No action. Pressing a switch shortly by accident will not
start any unwanted reaction of the instrument.
Off
Normal flash
0,2 sec on,
0,2 sec off
4 – 8 sec
Restore factory settings
All parameter settings (except field bus settings) will be
restored to situation of final test at BHT production
Normal
flash
0,2 sec on,
0,2 sec off
Off
8 – 12 sec
For FLOW-BUS only: install a free node-address on FLOW-
BUS.
Normal
flash
0,2 sec on,
0,2 sec off
Normal flash
0,2 sec on,
0,2 sec off
12 – 16 sec
Activate “Configuration Mode”. The baud rate and bus
type are set to 38K4 and RS232 FLOW-BUS (Propar). The
“Configuration Mode” is deactivated only after applying this
micro-switch action again.
LED indications using micro-switch at power-up situation of an instrument
Multi-functional switch
Status LED
Error/Warning LED

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3.3.2 LED functions
The LEDs on top of the instrument can also 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.
For details see “Manual interface: micro-switch and LEDs ”in Operation Instructions Digital
Instruments (document nr. 9.17.023, Chapter 11)
3.3.3 Rotary switch operation (multi-channel versions only)
The IQ+FLOW® multi-channel instruments are equipped with rotary switches for
selection of communication type, Baud rate and node address.
Communication type switch
With the ‘COMM. TYPE’ switch the following communication types can be selected:
0. RS485 9k6: Modbus RTU protocol with Baud rate 9600, EVEN parity
1. RS485 19k2: Modbus RTU protocol with Baud rate 19200, EVEN parity
2. RS485 38k4: Modbus RTU protocol with Baud rate 38400, EVEN partiy
3. RS232 38k4: FLOW-BUS protocol with Baud rate 38400
4. RS232 115k2: FLOW-BUS protocol with Baud rate 115200
Node address switches
With the two ‘NODE ADDRESS’ switches the node address of the instrument channels can be selected. The ‘MSD’
(Most Significant Digit) sets the first digit (tens), the ‘LSD’ (Least Significant Digit) sets the second digit (units). The
node address of channel 1 is set with the switches, the channels 2 and 3 receive ‘node address’ + 1 and ‘node address’
+ 2 respectively (e.g. MSD = 1 and LSD = 9 selects node 19 for channel 1, but also node 20 and 21 for channels 2 and 3).

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3.4 Basic RS232 operation
Digital operation adds a lot of extra features (compared to analog operation) to the instruments, such as:
•Up to eight selectable fluids (if installed)
•Direct reading at readout/control module or host computer
•Testing and self diagnosis
•Identification (serial number, model number, device type, user tag)
•Adjustable minimal and maximal alarm limits
•(Batch) counter
Hook-up
Connecting an IQ+FLOW® instrument to a COM port of a pc
requires a special cable (7.03.426) which changes the
appropriate pin configuration. Optionally use an RS232 to
USB2.0 converter (9.02.122) to connect to a USB port. Use the
split cable (Y-adapter 7.03.241) in combination with the Plug-
in Power Supply (7.03.424) for powering the instrument.
Instead of using a COM or USB port, it is also possible to
connect the RS232 pinning manually using the loose-end
cable (7.03.419), typically for connection to PLC or
microcontroller devices.
Dynamic Data Exchange (DDE)
RS232 communication can be used for operating the instrument using the Bronkhorst FlowDDE server application.
Dynamic Data Exchange (DDE) provides the user a basic level of interprocess communication between Windows
applications. FlowDDE is a DDE server application. Together with a client-application, either self-made or with a
SCADA-program from third parties, it is possible to create an easy way of data exchange between the flow controller
and a Windows application. For example, a cell in Microsoft Excel could be linked to the measured value of the flow
controller and when the measured value changes, it will be updated automatically in the Excel spreadsheet.
FlowDDE
The FlowDDE server also offers a lot of test facilities and user-adjustable settings for efficient communication with the
connected flow/pressure meter or controller. How to setup a DDE link with FlowDDE is described in the help-file of the
FlowDDE application. Programming examples are available for making applications in: Visual Basic, LabView and
Microsoft Excel.

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Software
Examples of free Bronkhorst® DDE client applications: FlowDDE, FlowPlot and FlowView. Other software programs
supporting DDE are for example MS-Office, LabView, Intouch and Wizcon.
Bronkhorst® software programs “FlowView” (left) and “FlowPlot” (right)
FlowDDE and other Bronkhorst applications are available on the support CD or can be downloaded
from the Bronkhorst internet site: http://www.bronkhorst.com/en/downloads
FlowDDE parameter numbers
Reading/changing parameter values via FlowDDE offers the user a different and user-friendly interface to the
instrument. A DDE-parameter number is a unique number in a special FlowDDE instruments/parameter database and
not the same as the parameter number from the process on an instrument. Node-address and process number will be
translated by FlowDDE to a channel number.
An instrument parameter can be changed by using the application name: ‘FlowDDE’ with only:
•topic, used for channel number: ‘C(X)’
•item, used for parameter number: ‘P(Y)’
Baud rate setup
Make sure that the instrument’s baud rate corresponds with the baud rate of the application the instrument is
communicating with. For single-channel instruments the selectable baud rates are 9K6, 19k2, 38k4, 57k6 and 115k2
Baud; for multi-channel instruments the selectable baud rates are 38k4 and 115k2 Baud.
For more information regarding communication through an RS232 interface, see document nr.
9.17.027: RS232 interface with FLOW-BUS for digital instruments.

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3.5 Basic RS485 operation
This section is limited to the description of the interface between the IQ+FLOW® instrument with a master device.
IQ+FLOW® instruments always serve as slaves in a Modbus system. There is no mutual communication between
Modbus slaves; only between master and slave. The master device is for example a pc.
More detailed information about Modbus can be found at http://www.modbus.org or any website of
the (local) Modbus organisation of your country (when available).
Hook-up
The figures below show examples of a number of IQ+FLOW® instruments in an RS485 bus-system. When the power
consumption is more than 15W, two seperated power networks are required due to the maximum power supply of
15 W for one PiPS.

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Software
When using a pc to communicate with IQ+FLOW® instruments only the FLOW-BUS protocol is supported by Bronkhorst
software. When using Modbus operation, software from third parties, such as LabView, ModScan or a Modbus PLC must
be used to serve as Modbus master.
Note: an IQ+FLOW® instrument set for RS485 FLOW-BUS or Modbus communication will not react when
connecting to an RS232 configuration. When required press the micro-switch according to the procedure
in section 3.3.1 at start-up to activate the “Configuration Mode”. The baud rate and bus type are set to
38K4 and RS232 FLOW-BUS (Propar). For multi-channel instruments the communication type can be set
with the rotary switches.
Slave address, baud rate and parity setup
The IQ+FLOW® instrument is configured as specified on order. If there is a need of changing any of the specified
settings, see the tables below for the supported configurations.
Single-channel versions
Mode:
Analog
Digital
Interface:
-
RS232
RS485
Bus protocol:
-
Propar
FLOW-BUS
Modbus RTU
Modbus ASCII
Baud rate:
-
9600
19200
38400
57600
115200
187500
400000
9600
19200
38400
56000
57600
115200
9600
19200
38400
56000
57600
115200
Node address:
-
3…125
3…125
1…247
1…247
Parity:
-
None*
None*
None; Even; Odd
None; Even; Odd
Multi-channel versions (select with rotary switches)
Mode:
Digital
Medium:
RS232
RS485
Bus protocol:
Propar
Modbus RTU
Baud rate:
38400
115200
9600
19200
38400
Node address:
3…99
1…99
Parity:
None*
Even
* Not selectable

9.17.045
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3.6 Basic parameters and properties
3.6.1 Introduction
Most instrument parameters can only be accessed with digital communication. For each communication protocol the
instrument parameters are accessed differently. When using Bronkhorst® software programs FlowView or FlowPlot,
easy access is provided to the mostly used parameters by menu interfaces. When using other communication methods
the addressing method for the supported communication protocol is presented for a number of basic parameters in a
table as seen below:
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
[type]
RW

[x]…[y]
[FB]
[Pro]/[Par]
[address]/[index]
Type
Unsigned char 1 byte character
Unsigned char[x] x byte array (string)
Unsigned int 2 byte unsigned integer
Unsigned long 4 byte unsigned long
Float 4 byte floating point
Access
R The parameter is read-only
RW The parameter can be read and written
RWThe parameter is protected and can only be written when the ‘Init Reset’ parameter is set
to 64. See section 4.1.1 for more details.
Range
Some parameters only accept values within a certain range:
[x] Minimal value of the range.
[y] Maximal value of the range.
FlowDDE
Parameter number within FlowDDE. Refer to section 3.4 for more information about FlowDDE.
FLOW-BUS
Within the FLOW-BUS protocol (Propar when using RS232) parameters are divided into a ‘Process’ and a ‘Parameter’
number. To address parameters using the FLOW-BUS/Propar protocol write both numbers:
[Pro] Process number
[Par] Parameter number
Check document 9.17.027, “RS232 interface with FLOW-BUS protocol” for detailed information.
Modbus
Parameters can be read or written via the Modbus protocol by specifying either the PDU Address or the register
number. The PDU Address is a hexadecimal number (identifyable by the ‘0x’ prefix), which corresponds to the decimal
register number minus one, e.g. PDU Adress 0x0000 equals register number 1, PDU Adress 0x000A equals register
number 11 etc.):
[address] Hexadecimal PDU address
[index] Decimal register number
For the Modbus protocol every two bytes are addressed separately.

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3.6.2 Basic measurement and control parameters
The list below provides the most basic parameters for digital communication with the instrument.
For more detailed information regarding operation parameters, see document nr. 9.17.023: Operational
instructions for digital instruments.
Measured Value (Measure)
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned int
R
0…41942
8
1/0
0x0020/33
The ‘Measured Value’ indicates the amount of mass flow or pressure metered by the instrument. The signal of
0...100% will be presented in a range of 0...32000. The maximum measured value output is 131.07 %, which is: 41942.
A floating point variable of the measured value, ‘Fmeasure’, is also available in the capacity and capacity unit for which
the instrument has been set, see section 4.
Setpoint
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned int
RW
0…32000
9
1/1
0x0021/34
The ‘Setpoint’ is used to set the required mass flow rate or pressure for the controller. The signals have the same
range as the measured value, only the setpoint is limited between 0 and 100% (0…32000). A floating point variable of
the setpoint, ‘Fsetpoint’, is also available in the capacity and capacity unit for which the instrument has been set, see
section 4.
3.6.3 Basic identification parameters
User Tag
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned char[16]
RW
-
115
113/6
0xF130…0xF136/61745…61751
The ‘User Tag’ parameter allows the user to give the instrument a custom tag name, with a maximum of 16 characters.
It is advised however to limit the user tag name up to 7 characters when using the Bronkhorst® E-7000 readout and
control modules. These modules can display the tag name of an instrument only up to 7 characters.
Customer Model
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned char[16]
RW

-
93
113/4
0xF120…0xF127/61729…61736
This parameter is used to add extra information to the model number information, such as a customer-specific model
number.
Serial Number
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned char[20]
R
-
92
113/3
0xF118…0xF11F/61721…61728
This parameter consists of a maximum 20-byte string with instrument serial number for identification, for example:
‘M1111111A’.
BHT Model Number
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned char[23]
R
-
91
113/2
0xF111…0xF117/61713…61719
This parameter shows the Bronkhorst® instrument model type information.

9.17.045
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4. Advanced operation
4.1 Reading and changing instrument parameters
4.1.1 Special parameters
!
All parameters described in this chapter have influence on the behaviour of the mass flow meter. Please
be aware that wrong settings can disorder the output. To avoid unintential changes, some parameters
are locked (shown by the symbol). To unlock parameters set parameter ‘Init Reset’ to ‘Unlocked’.
Init Reset
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned char
RW
82/64
7
0/10
0x000A/11
The ‘Init Reset’ parameter is used to unlock advanced parameters for writing. This parameter can be set to the
following values:
Value
Mode
Instrument action
82
Locked
Advanced parameters are read-only
64
Unlocked
Advanced parameters are writeable and readable
This parameter is always set to ‘Locked’ at power-up.
Control Mode
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned int
RW
0…255
12
1/4
0x0024/37
The ‘Control mode’ is used to select different functions of the instrument. The following modes are available:
Value
Mode
Instrument action
Setpoint source
Master
source
Slave
factor
0
BUS/RS232
Controlling
RS232/RS485
1
Analog input
Controlling
Analog input
2
FLOW-BUS slave
Controlling as slave of other
instrument on bus
FLOW-BUS * slave
factor / 100%
FLOW-BUS
Slave
factor
3
Valve close
Close valve
4
Controller idle
Stand-by on BUS/RS232
Controlling is stopped; Valve Out
freezes in current position
5
Testing mode
Test mode enabled (factory only)
6
Tuning mode
Tuning mode enabled (factory only)
7
Setpoint 100%
Controlling at setpoint 100%
Fixed 100%
8
Valve fully open
Valve fully opened
9
Calibration mode
Calibration mode enabled (factory
only)
10
Analog slave
Controlling as slave of other
instrument on analog input
Analog input *
slave factor / 100%
Analog input
Slave
factor
12
Setpoint 0%
Controlling at setpoint 0%
Fixed 0%
13
FLOW-BUS
analog slave
Controlling as slave of other
instrument on bus, slave factor is
set with signal on analog input
FLOW-BUS *
analog input *
slave factor / 100%
FLOW-BUS *
analog input
Analog
input
18
RS232
Controlling
RS232
20
Valve steering
Setpoint is redirected to Valve Out
with controller idle
21
Analog valve
steering
Analog input is redirected to Valve
Out with the controller idle
22
Valve safe state