BRONKHORST MASS-VIEW series User manual

Instruction manual
MASS-VIEW®series
Doc. nr.: 9.17.051G Date: 10-04-2018
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.

BRONKHORST®
Page 2 MASS-VIEW® series 9.17.051
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,
misstatement 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.

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9.17.051 MASS-VIEW® series Page 3
Short-form Operation Instruction
Before installing the MASS-VIEW® it is important to be
sure whether you received the right model using the
packing list and the attached label on the instrument.
Be sure the piping system is clean. For absolute
cleanliness always install filters to assure a moisture and
oil-free gas stream. Install the MASS-VIEW® according to
the direction of the flow arrow on the label at the back
of the instrument.
Install the instrument in the line and tighten the fittings
according to the instructions of the supplier of the
fittings.
Be sure the system has no leaks before applying gas
pressure.
Electrical connections must be made with a standard
cable or according to the hook-up diagram in this
manual.
When the instrument is powered up the first time, a
setup menu appears where the pre-installed gas can be
selected, which flow range is to be used and which
communication type.
Use the 4-way button (up and down direction) for
navigation and press the centre of the button to select.
Apply power to the instrument and allow approx. 30
minutes for warm-up and stabilization. This may be done
with or without gas pressure applied to the system.
After entering the default password (which is ‘abc’) in
the security menu, all menus can be enabled or disabled.
Also a new password can be entered and saved.
Perform zero action if needed. See instructions at section
3.6 zeroing procedure in this manual.
Your instrument is now ready for operation.

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TABLE OF CONTENTS
I n s t ru c t io n m a n u al ............................................................................................................................. 1
Please read this instruction manual carefully before installing and operating the instrument................... 1
Short-form Operation Instruction ........................................................................................................... 3
TABLE OF CONTENTS .............................................................................................................................. 4
1General Product Information ........................................................................................................... 5
1.1 Introduction ....................................................................................................................................................... 5
1.2 Intended Use...................................................................................................................................................... 5
1.3 Symbols.............................................................................................................................................................. 5
1.4 Product Support References.............................................................................................................................. 5
1.5 Warranty............................................................................................................................................................ 6
1.6 General Description ........................................................................................................................................... 6
1.7 Housing .............................................................................................................................................................. 6
1.8 Sensor principle ................................................................................................................................................. 7
1.9 Needle valve principle ....................................................................................................................................... 7
1.10 Constant-flow controller principle..................................................................................................................... 7
1.11 Electronics, display and 4-way button ............................................................................................................... 8
1.12 Software tools.................................................................................................................................................... 9
2Installation.................................................................................................................................... 10
2.1 Unpacking and inspection................................................................................................................................ 10
2.2 Removal and return instructions ..................................................................................................................... 10
2.3 Mounting ......................................................................................................................................................... 11
2.4 In-line filter ...................................................................................................................................................... 11
2.5 Fluidic connections .......................................................................................................................................... 11
2.6 Piping ............................................................................................................................................................... 11
2.7 Electrical connections ...................................................................................................................................... 11
2.8 Test pressure ................................................................................................................................................... 12
2.9 Supply pressure ............................................................................................................................................... 12
2.10 System purging ................................................................................................................................................ 13
2.11 Seals ................................................................................................................................................................. 13
2.12 Equipment storage .......................................................................................................................................... 13
2.13 Electromagnetic compatibility ......................................................................................................................... 13
3Operation ..................................................................................................................................... 14
3.1 General ............................................................................................................................................................ 14
3.2 Power and warm-up ........................................................................................................................................ 14
3.3 Setting up the instrument................................................................................................................................ 14
3.4 User Interface, menu structure and instrument functions.............................................................................. 15
3.4.1 The readout screen ................................................................................................................................... 15
3.4.2 Changing the readout screen.................................................................................................................... 15
3.4.3 The menu structure .................................................................................................................................. 16
3.4.4 Sleep mode ............................................................................................................................................... 17
3.4.5 Counter ..................................................................................................................................................... 17
3.4.6 Alarms ....................................................................................................................................................... 17
3.4.7 Alarm outputs ........................................................................................................................................... 18
3.4.8 User tag..................................................................................................................................................... 18
3.4.9 Alarm contacts .......................................................................................................................................... 18
3.5 Other gases ...................................................................................................................................................... 19
3.6 Zeroing procedure ........................................................................................................................................... 19
4Maintenance................................................................................................................................. 20
4.1 General ............................................................................................................................................................ 20
4.2 Needle valves................................................................................................................................................... 20
5Troubleshooting............................................................................................................................ 21
5.1 General ............................................................................................................................................................ 21
5.2 Troubleshooting summary............................................................................................................................... 21
5.3 Service and repair ............................................................................................................................................ 21

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1General Product Information
1.1 Introduction
MASS-VIEW®instruments are accurate instruments for measuring and controlling the mass flow rate of
gases. These smart instruments offer multiple process values as input- or output parameters. Many
parameters can be changed on the instrument through the menu, other parameters can only be
changed using our digital interfaces.
This manual covers the general part of the MASS-VIEW®series mass flow instruments for gases. It
covers the general instructions needed for the instruments.
1.2 Intended Use
The intended use of MASS-VIEW®instruments is to measure or control gas flow rates of the
specified gas types as stored in the instrument. The gas has to be clean and dry.
1.3 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.
1.4 Product Support References
MASS-VIEW®instruments have modular instruction manuals consisting of:
- Instruction manual MASS-VIEW®series (document nr. 9.17.051)
- Short form instruction manual MASS-VIEW®series (document nr. 9.17.054)
- Operation instructions digital instruments (document nr. 9.17.023)
Fieldbus/interface description:
Manual :
Hook-up diagram :
RS232 Interface with FLOW-BUS protocol
9.17.027
9.16.044
Modbus interface
9.17.035
9.16.066
- FlowPlot Manual (document nr. 9.17.030)
- Hook-up diagram MASS-VIEW®series (document nr. 9.16.085)
- Dimensional drawing MASS-VIEW®series (document nr. 7.05.697)
MASS-VIEW®Controller series (document nr. 7.05.890)
These documents can be downloaded from our website: www.massflow-online.com

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1.5 Warranty
Bronkhorst® products are warranted 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.
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 non-
warranty may be charged for.
Mass Flow ONLINE 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.
1.6 General Description
The MASS-VIEW®series operate on the principle of direct thermal mass flow measurement (no by-
pass). An advantage of using this type of sensor is that the instruments measure direct mass flow,
virtually independent of pressure and temperature changes, and have a low pressure drop.
Other advantages compared to conventional meters are the high accuracy and the large range ability.
The MASS-VIEW®series are supplied with totalizer and alarm functions. Flow control can be achieved
by an optional built-in needle valve. A bright graphical OLED display, clearly visible over any angle,
allows reading of actual flow (value and bar graph), total flow and fluid type. The display features easy
navigation through a user-friendly menu, using a 4-way button with centre push. Furthermore the
instruments have 2 potential free alarm contacts grounded on one side.
1.7 Housing
The MASS-VIEW®meter has a straight tube with a mass flow sensor. The fluid connections have an
inner thread of G1/4” (1/4” BSPP cavity) or G1/2” (G1/2” BSPP cavity). The connections reside on the
back of the instrument.
The bottom fluid connection is the inlet; the upper connection is the outlet.
For electrical connection and power supply, the instrument has a RJ-45 modular connector on top of the
instrument. These instruments are suited for indoor (dry) applications, like laboratories and in well
protected (OEM) housings. The front part is made of ABS, the back part of Aluminium. The laminar flow
element and orifice size inside the control valve are optimized for the customers gas and process
conditions.
MASS-VIEW®
MASS-VIEW®
with needle valve
MASS-VIEW®
with constant-flow controller

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1.8 Sensor principle
The MASS-VIEW®operates on the principle of direct thermal mass flow
measurement. The thru-flow design sensor consists of a heater resistor and a
temperature sensing resistor. Both resistors are made of temperature sensitive
resistive material that is covered with a stainless steel tube. The necessary heating
power to keep the temperature difference between the heater resistor and the
sensing resistor at a constant level depends on the mass flow. A different and
unique heater current is produced for each value of the flow. The measurement
principle described is called Constant Temperature Anemometry (CTA).
The transfer function between mass flow and output signal can be described by the
equation:
Vsignal = output signal
K = constant factor
(includes λ–heat conductivity, Cp–specific heat, μ–dynamic viscosity and ρ–density of the gas)
m= mass flow
1.9 Needle valve principle
The needle valve has an orifice with a long, tapered conical seat. A needle-
shaped plunger, on the end of a screw, exactly fits this seat. As the screw
is turned and the plunger retracted, flow between the seat and the
plunger increases. Since it takes many turns of the fine-threaded screw to
retract the plunger, precise regulation of the flow rate is possible.
1.10 Constant-flow controller principle
Flow control with a needle valve at constant pressure results in a constant
flow rate. But when pressure conditions change, the flow will also change.
With a constant-flow controller with varying upstream pressure the flow
will almost be constant.
By keeping the pressure drop across a needle valve constant the flow rate also is constant. Deviations of
the pressure drop are compensated by a membrane operated valve. This membrane is actuated by a
spring. The spring force closes the valve.
The equilibrium between closing (valve spring) and opening (membrane) keeps the flow constant.
Schematic flow diagram constant-flow controller
msignal KV 

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The pressure loss across the needle can be described by:
  


  
The spring force in the upstream membrane valve closes the valve in the “zero” flow situation. By
opening the needle valve the ΔP will increase, so far that the membrane lifts up and compensates the
spring force. In the equilibrium position the flow will be constant even when the upstream pressure (Pin)
changes. However when the upstream pressure increases, it will cause a small effect on the spring force,
which means that the ΔP to open the membrane valve will be a little smaller. This results in a lower
flow.
In practise the deviation of the ideal straight line will be less than 0,5-1% per bar.
1.11 Electronics, display and 4-way button
The MASS-VIEW®has a bright graphical OLED display,
clearly visible over any angle, which allows reading of
actual flow (value and bar graph), total flow and gas type.
The three display options can be changed using the 4-way
button This button is a navigation joystick which has
UP/DOWN/LEFT/RIGHT keys and a centre push (ENTER)
key.
4-way button

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1.12 Software tools
The MASS-VIEW®series have a digital interface which can be connected using RS-232 (or RS-485) to a
computer. For a MS-Windows based PC, we have several freeware tools available for download on our
website.
FlowDDE
the FLOW-BUS DDE (Dynamic Data Exchange) Server is gathering data from the modules
connected to the FLOW-BUS, and at the same time transferring data to these modules. DDE
provides the user a basic level of inter process communication between MS-Windows
applications and is therefore, the most flexible way to transfer data. By using DDE commands,
sent by software, to the DDE Server, data can be sent or requested from the FLOW-BUS.
FlowDDE communicates very easily with Microsoft Excel and other applications.
FlowPlot (needs FlowDDE).
Flow-Plot is a DDE-client program for service-purposes on Bronkhorst® digital instruments or
readout-units. It gives good insight into the dynamic behaviour of digital instruments.
FlowView (needs FlowDDE).
FlowView is a DDE-client program to operate Bronkhorst® digital instruments.

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2Installation
2.1 Unpacking and inspection
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 supplier.
Remove the envelope containing the packing list; carefully remove the equipment from the packing box.
Inspect the contents for damaged or missing parts.
Before installing a MASS-VIEW®instrument it is important to read the attached label and check:
- Model type
- Power supply
- Maximum pressure
- Temperature
Do not discard spare or replacement parts with the packing material and inspect the contents for
damaged or missing parts.
2.2 Removal and return instructions
When returning material, arrange a return material authorisation (RMA) at www.massflow-online.com
and completely fill out the RMA request.
Instrument handlings:
Purge gas lines
Remove instrument from line
Insert the instrument into a plastic bag and seal the bag
Place the bag in an appropriate shipping container
Add documentation:
Reason of return
Failure symptoms
Contaminated condition
Declaration on Contamination
When returning material, always describe the problem and if possible the work to be done on the RMA
request.
It is absolutely essential that you notify your supplier if toxic or dangerous fluids have been in contact
with the instrument!
This is to enable us to take sufficient precautionary measures to safeguard our staff.
Take proper care of packing, if possible use the original packing box; seal instrument in plastic etc.
Note:
If the instruments have been used with toxic or dangerous fluids the customer should pre-clean the
instrument.
All instruments must be dispatched with a fully completed 'declaration on contamination form', found
in the RMA-form on the website. Instruments without this declaration will not be accepted.

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2.3 Mounting
The mounting position of the MASS-VIEW®is vertical, although it is possible to turn the device 180° and
change the display setting. Avoid installation in close proximity of mechanic vibration and/or heat
sources.
2.4 In-line filter
2.5 Fluidic connections
The MASS-VIEW®can be equipped with (compression) fittings. Follow the guideline of the
manufacturer of the fittings.
Please be aware when using Oxygen (O2) that the fittings mounted to the body should be absolutely
oxygen clean.
2.6 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 on high flow rates. At least 10 pipe
diameters distance between the angle and the instrument is recommended.
DO NOT mount pressure regulators direct on the inlet of gas flow meters/controllers, but allow some
meters of piping (at least 25 pipe diameters).
2.7 Electrical connections
The MASS-VIEW®instruments are powered with +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. Refer to Hook-up MASS-VIEW®series (document nr. 9.16.085) for more
details.
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 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.
!
Although the gases to be measured should be absolutely free of dirt, oil, moisture and other particles,
it is recommended to install an in-line filter upstream of the flow meter / controller, and if backflow
can occur, a downstream filter is recommended too. Be aware of the pressure drop caused by the
filter.
While tightening fittings, do not apply excessive force, in order to avoid damaging in/output thread or
other sensitive parts of your instruments.
Always check your system for leaks, before applying fluid pressure. Especially if toxic, explosive or other
dangerous fluids are used.
We recommend using our standard cables. These cables have the right connectors and if loose ends
are used, these are coloured and marked to prevent improper connection.
All cabling options can be purchased online www.massflow-online.com

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Please study carefully the hook-up diagram which is shown here:
Depending on the mode of the digital output (which
can be changed through the user interface) the
function of pin 1 and pin 6 are:
Pin 1 = RS232 TXD or MODBUS D0
Pin 6 = RS232 RXD or MODBUS D1
Pin 2 = analog output
Pin 3 = alarm contact 1
Pin 5 = alarm contact 2
Pin 4 = 0V shared alarm contact for alarm 1/2
2.8 Test pressure
Each instrument is pressure tested.
The tested pressure is stated on the instrument label.
The absolute maximum line pressure is 10 bar (g). Check test pressure before installing in the line. If the
label is not available or the test pressure is incorrect, the instrument should not be mounted in the
process line.
2.9 Supply pressure
Do not apply pressure until electrical connections are made. When applying pressure to the system, take
care to avoid pressure shocks in the system and increase pressure gradually.
To use both the power supply and an analog or digital connection, you should use the optional
shielded RJ-45 Y-adapter.
All connector and cabling options can be purchased online: www.massflow-online.com
Available cabling options on massflow-online.com

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2.10 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. Complete purging is also required to remove such gases from the system before
exposing the system to air.
2.11 Seals
The seals fitted are compatible with the published list of gases, at the stated conditions.
2.12 Equipment storage
The equipment should be stored in its original packing in a cupboard, warehouse or similar. Care should
be taken to not subject the equipment to excessive temperatures or humidity.
2.13 Electromagnetic compatibility
The MASS-VIEW® series carries the CE-mark.
Therefore it has to comply with the EMC requirements as are valid for these instruments.
However compliance with the EMC requirements is not possible without the use of proper cables and
connector assemblies. Do not use unshielded wire terminals.

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3Operation
3.1 General
Bronkhorst® instruments are designed in such a way that they will meet user process requirements in
the best possible way. Flow meters and controllers are powered from a dc power source with a minimal
ripple. When providing your own power supply be sure that voltage and current rating are according to
the specifications of the instrument and furthermore that the source is capable of delivering enough
energy to the instrument. Cable wire diameters should be sufficient to carry the supply current and
voltage losses must be kept as low as possible.
3.2 Power and warm-up
Before switching on the power, be sure all connections have been made according to the hook-up
diagram in 2.7. Check gas connections and make sure there is no leakage. If needed purge the system
with a proper gas. Turn on power and allow at least 30 minutes for warming up and stabilizing. During
the warm-up period, gas pressure may either be on or off.
3.3 Setting up the instrument
After powering on, the first time, the instrument will ask which gas is used and which flow range is to be
used (see picture below).
Navigate to the fluidname using the 4-way button (up and down direction) and press in the centre to
make a selection, then select the range using the up and down direction and press also in the centre to
make the selection.
After selecting the fluid and the range, the communication type can be selected .
The settings will be stored when the “save” button is pressed.
Then turn on gas supply gently. Avoid pressure shocks, and bring the instrument gradually up to the
level of the actual operating conditions. Also switch off gas supply gently.
The MASS-VIEW®is designed in such a way that for a change in the range or gas, you simply select
another available range or gas in the menu.
After entering the default password (which is ‘abc’) in the security menu, all menu’s can be enabled or
disabled. Also a new password can be entered and saved.

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3.4 User Interface, menu structure and instrument functions
3.4.1 The readout screen
The readout screen of the MASS-VIEW®is divided into several blocks as described in the picture
on the right.
1. At the top of the screen the fluid name and the unit dimensions are
displayed.
2. Left of the graph the capacity is displayed.
3. If there are any alarms activated, their values will be displayed at the left
side of the graph.
More information about how to use the alarms can be found in chapter
3.4.6.
4. The custom readout parameter 1 is displayed near the bottom of the screen.
More information can be found in chapter 3.4.2.
5. The “Flow marker” indicates the desired flow and is only a “marker” where
the actual flow should be. The Flow Marker value can be set in the menu
“marker”.
6. Readout parameter 2 is displayed at the bottom of the screen and indicates
the actual flow and the selected unit.
3.4.2 Changing the readout screen
It is possible to customize the readout screen using the navigation button (see picture below).
By pressing left or right one can switch between three different graph sizes. Depending on the selected
graph one can also switch between four different custom readout parameters by pressing up or down.
1. Full scale capacity with unit.
2. Flow marker value. “Off” when flow marker is disabled.
3. Usertag.
4. Counter with counter unit. “Off” when counter is disabled.
The readout parameter 2 can be displayed in percentage or actual capacity units. This can be changed
with the “Readout” parameter in the measure menu.
Capacity choice:
Measurement below 2% of the full scale will be interpreted as 0 (m)ln/min flow.

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3.4.3 The menu structure
From the readout screen one can enter the menu by pressing enter. One can navigate through the
menu-items using up and down and enter the selected item by pressing enter.
Select the “back” option to return to the readout screen or to go up one level in the menu.
In each sub-menu various parameters can be edited by pressing enter.
Depending on the type of parameter, the edit screen will look like the following.
In the value-list edit screen a value can be selected from a list using the up and down button. The
number of parameter values in the list and the index of the selected item will be displayed on top of the
screen. In the value edit screen the parameter value can be changed by selecting the digits using left or
right and then increase or decrease the value using up or down.
Pressing enter after editing the parameter value will save the new value and return to the sub-menu.
Note:
The visibility of some parameters depends on the value of other parameters. For instance if the marker
is disabled, the marker value will not be displayed.

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3.4.4 Sleep mode
To increase the lifetime of the display a sleep mode is built-in which displays the flow at a random place
on the screen. The sleep mode will become active when the readout screen is visible and no button is
pressed for a number of minutes.
The screensaver and the delay can be enabled in the settings menu.
In addition to the sleep mode the display contrast can be adjusted in 5 steps in the settings menu.
3.4.5 Counter
The counter in the MASS-VIEW®can be set up in the “counter” menu and has 3 different modes which
can be selected via the “mode” parameter in the “counter” menu:
1. Off : counter disabled.
2. Up : counting upwards continuously.
3. Up to.. : counting up to limit (batch counter).
When the counter mode is set to “Up” or “Up to..” the following parameters will be displayed
Unit: The output unit in which the counter will be displayed on the screen. (FlowDDE parameter
123 or 128).
Limit: Batch limit. This parameter is only active when counter mode “Up to..” is selected.
Reset: Resets the counter.
3.4.6 Alarms
The alarms can be adjusted in the Alarms menu using the following parameters:
Activate (FlowDDE parameter 118)
This parameter sets one of the following alarm modes.
Name:
DDE Value:
Description:
None
0
Alarms Off.
Min + max
1
Alarm on absolute limits.
Response
2
Alarm on limits related to setpoint/marker.
When the alarm mode is set to “None”, the other alarm parameters are not visible in the menu.
Set max / Set min (FlowDDE parameter 116 and 117)
The minimum and maximum alarm values can be set between 0% and 130%.
An alarm can be disabled by setting the value to 0%.
When alarm mode “min + max” is selected, these are absolute values, when “Response” is selected
these values are relative to the setpoint or marker value. This enables the user to create a band around
the setpoint/marker.
Delay (FlowDDE parameter 182)
The delay parameter is the time in seconds the alarm action will be delayed when alarm limit has been
exceeded. This is also the time automatic reset will be delayed when sensor signal reaches the desired
level again.

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Mode (FlowDDE parameter 156)
With the “mode” parameter the user can choose if the alarms reset automatically or manually.
When the reset mode is set to automatic, the alarms will be reset when measure reaches the desired
level and the delay time has exceeded.
When the reset mode is manual, the user can reset the alarms in the following ways:
1.
With the “reset” option in the alarms menu.
2.
Via RS-232 (or FLOWDDE / FlowView / FlowPlot).
Writing the value “2” to FLOWDDE parameter 114 resets the alarms.
3.
When the readout screen is visible and an alarm is active, this will be displayed at the top of the
screen (see chapter 3.4.7). By pressing up at an alarm situation, the user can reset the alarms
from the readout screen.
Relay
The relays parameter sets the output mode of the relays. The user can choose between disabled,
enabled and pulse. When a relay is active, the relay contact will connect to the 0V signal.
3.4.7 Alarm outputs
The status of the alarms can be read in various ways.
For example when the minimum and maximum alarms are enabled this is
made visible in the readout screen with two markers at the left of the
graph (see picture on the right).
When an alarm arises the corresponding marker will be highlighted and
the header will blink and display the alarm.
The MASS-VIEW®meters have two relays which indicate an alarm situation.
The status of the relays depend on the alarm source and status of the
relay parameter (see table below).
disable
enable
pulse
Relay 1
Relay 2
Relay 1
Relay 2
Relay 1
Relay 2
Min alarm
0
0
1
0
0/1/0/1/0/1…
0
Max alarm
0
0
0
1
0
0/1/0/1/0/1…
Response (min)
0
0
1
1
0/1/0/1/0/1…
0/1/0/1/0/1…
Response (max)
0
0
1
1
0/1/0/1/0/1…
0/1/0/1/0/1…
Counter
0
0
1
1
0/1/0/1/0/1…
0/1/0/1/0/1…
3.4.8 User tag
The User tag can be edited at the menu item info.
3.4.9 Alarm contacts
The MASS‐VIEW® flow meter has two alarms connected to a
relay/switch.
This relay is already included in the MASS‐VIEW®.
One side of the switch is connected to ground (pin 4, 0 Vdc)
and the other side is connected to Pin 3 (alarm max).
The other relay is also with one side connected to
Ground (pin4, 0 Vdc) and the other side is connected
to Pin 5 (alarm min).
Switching current: max. 24 Vdc, 0.5 A.
PCB / Alarm max.
PIN 3
(max. 24V, 0.5A)
Relay 1 / Switch 1
PIN 4 0V
PCB / Alarm min.
PIN 5
(max. 24V, 0.5A)
Relay 2 / Switch 2
PIN 4 0V

BRONKHORST®
9.17.051 MASS-VIEW® series Page 19
3.5 Other gases
The MASS-VIEW®series are calibrated on Air. All other pre-installed gases are calculated using a
theoretical conversion model which describes the flow curve for other gases which will introduce
additional inaccuracies.
However, as the accuracy of the conversion model also depends on viscosity, pressure and temperature,
special attention should be taken for gases in the heterogeneous gas state where specific heat, density,
thermal conductivity and viscosity can vary tremendously.
3.6 Zeroing procedure
The MASS-VIEW®has a zero procedure for each individual gas. The zero function permits the user to
zero the instrument when needed. Please make sure the instrument is zeroed on the desired gas at the
desired operating temperature and pressure conditions. It is extremely important that all flow be
blocked and the MASS-VIEW®is in a static (NO FLOW) condition. Select from the main Menu Option ->
Fluidset -> Zero. Pause a few seconds, then press any key to complete the zero procedure.

BRONKHORST®
Page 20 MASS-VIEW® series 9.17.051
4Maintenance
4.1 General
No routine maintenance is required to be performed on the instrument. Units may be purged with
clean, dry inert gas. The MASS-VIEW®is designed in such a way that for a change in the range or gas,
you simply select another available range or gas in the menu.
In case of severe contamination it may be required to clean the inside of the instrument. After cleaning
a recalibration is needed. Bronkhorst® has a trained staff of servicemen available. Contact Mass Flow
ONLINE B.V. for cleaning and recalibration options.
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.
4.2 Needle valves
CAUTION: Pressure surges, as may occur during system pressurisation or deflation must be avoided.
Excessive force used to achieve positive shut-off can deform or score the sealing surface in the valve.