VPInstruments VPFlowScope VPS.R080.M050 series User manual

VPFlowScope in-line
VPINSTRUMENTS.COM
User manual
© 2017 Van Putten Instruments BV
MAN-VP-SINL-UK-1701 Date:22-03-2017

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alleged to have been caused directly or indirectly bythis document.
Creation date: 22-03-2017 in Delft
VPFlowScope in-line
© 2017 Van Putten Instruments BV
Publisher
Van Putten Instruments BV
Buitenwatersloot 335
2614 GS Delft
The Netherlands
This document is available in:
English, English (UK)

3Contents
3
Table of Contents
1Warning - Read this first 5
2Introduction 6
3Product overview 7
................................................................................................................................... 71Configuration
................................................................................................................................... 82VPFlowScope in-line D0 (no display)
................................................................................................................................... 83VPFlowScope in-line D10 & D11 (display version)
................................................................................................................................... 84VPFlowScope in-line D0 with the VPFlowTerminal
4Quick start 9
5Measurement 10
................................................................................................................................... 101Flow
................................................................................................................................... 102Pressure
................................................................................................................................... 103Temperature
................................................................................................................................... 114Totalizer
6Mechanical installation 12
................................................................................................................................... 121Piping table
................................................................................................................................... 132Installation without tubing kit
................................................................................................................................... 133Installation with tubing kit
7Display 15
................................................................................................................................... 151Display status icons
................................................................................................................................... 152LCD display
................................................................................................................................... 153Data Logger
................................................................................................................................... 164Keypad
................................................................................................................................... 165Menu
8VPStudio software 19
9Electrical connections 20
................................................................................................................................... 2014..20mA output
................................................................................................................................... 222Pulse output
................................................................................................................................... 233Modbus interface
................................................................................................................................... 274USB interface
10 Service 28
................................................................................................................................... 281Software and firmware updates
................................................................................................................................... 282Calibration interval

VPFlowScope in-line4
© 2017 Van Putten Instruments BV | MAN-VP-SINL-UK | Revision:1701 | Date:22-03-2017
................................................................................................................................... 283Service subscriptions
11 Specifications 29
12 Order information and accessories 30
13 Appendix A - UL 31

© 2017 Van Putten Instruments BV | MAN-VP-SINL-UK | Revision:1701 | Date:22-03-2017
5
1Warning - Read this first
Compressed gasses can be dangerous! Please familiarize yourself with the
forces under pressurized conditions. Respect the local guidelines and regulations
for working with pressurized equipment.
Gas flow through pipes follows certain physical laws. These physical laws
have serious consequences for the installation requirements. Familiarize yourself
with the basic physical laws of flow measurement, to make sure that the product is
installed correctly. Always make sure that upstream length, downstream length,
flow, pressure, temperature and humidity conditions are within specifications.
Precision instruments need maintenance. Check your flow meter regularly and
make sure it remains clean. When polluted, gently clean the sensor using de-
mineralised water or cleaning alcohol.
Precision instruments need regular re-calibration. To keep your
VPFlowScope probe in best shape, it needs recalibration. We advice annual
recalibration.
Not intended for fiscal metering or billing. Our flow meters are not certified for
fiscal metering. Laws on fiscal metering and billing may vary per country or state.
Do not overestimate the results. VPInstruments does not take any
responsibility for the correctness of measurement results under field
conditions. The practical measurement uncertainty of a flow meter in the field may
vary, depending on how well it is installed, due to the nature of gas flow. The piping
table provides guidelines on how to optimize the field accuracy. Our products are
not intended to be used as a single means to determine compressor capacity.
Do not open the device. Our instruments are assembled with high precision.
Opening this device is dangerous and may destroy the instruments. Warranty is
voided when you open the instrument.
Feedback leads to product improvement. Please share your experience with
us, as we are continuously improving our products in our commitment to quality,
reliability and ease of use. Let us know via [e-mail]!

© 2017 Van Putten Instruments BV | MAN-VP-SINL-UK | Revision:1701 | Date:22-03-2017
6VPFlowScope in-line
2 Introduction
Congratulations! You purchased the easiest to use and most complete compressed air
measurement tool in the world. With the VPFlowScope in-line, you can monitor and record flow,
pressure, temperature, and total air consumption, simultaneously.
Great products deserve great user manuals. We have done our best to make this user manual as
complete as possible. New users, please read it carefully to familiarize yourself with our products.
Experienced users can check out the Quick start chapter.
Check the packaging box for any inconsistencies. Should there be any shipping damage, notify the
local carrier. At the same time a report should be submitted to Van Putten Instruments BV,
Buitenwatersloot 335, 2614 GS DELFT, The Netherlands.
This manual is dedicated to:
VPS.R080.M050.DXX Where DXX indicates the display type
VPS.R250.M100.DXX Where DXX indicates the display type
VPS.R01K.M200.DXX Where DXX indicates the display type
VPStudio software version 1.24
Sensor firmware version 1.20
Display firmware version 2.9.1
Older software features may not be covered by the contents of this user manual. Please contact us
for a service subscription program, which includes software and firmware updates!

© 2017 Van Putten Instruments BV | MAN-VP-SINL-UK | Revision:1701 | Date:22-03-2017
7
3Product overview
The VPFlowScope in-line measures mass flow, temperature and pressure simultaneously. All these
parameters are key to proper compressed gas measurement and are therefore included in all
models. All data can be accessed by Modbus RTU, 4..20mA and pulse.
The VPFlowScope in-line is available in three configurations to fit every application. Use the
connector cap for sensor features only, ideal for integration into a central management system. Use
the display module for central read out and data logging. Use the VPFlowTerminal for central read out
and data logging on location where a standard display can not be read out. For all models, all
parameters and outputs are available.
The VPFlowScope in-line is available in three sizes: 0.5", 1" and 2". Additional options are available
for all types:
Order Code
Flow range
Option
Display
Option
Connector
VPS.R080.M050
0 ... 80 m3n/hr
D0
No display
C5
5 Pin M12
VPS.R250.M100
0 ... 250 m3n/hr
D10
Display
C8
8 Pin M12, for remote
logging *
VPS.R01K.M200
0 ... 1000 m3n/hr
D11
Display + 2M point logger
* An 8 Pin M12 connector can only be ordered in combination with a D0 model.
Order the VPFlowScope in-line KIT to receive the complete start kit with all required accessories,
everything you need to get started right away.
3.1 Configuration
The instruments are pre programmed and ready to use. For configuration of the outputs and data
logger, the VPStudio configuration software is used. This software can be downloaded from our
website. www.vpinstruments.com/downloads

© 2017 Van Putten Instruments BV | MAN-VP-SINL-UK | Revision:1701 | Date:22-03-2017
8VPFlowScope in-line
3.2 VPFlowScope in-line D0 (no display)
The D0 model can be used in applications where local read-out and data logging is not required. With
it's various outputs the VPFlowScope in-line can be connected to remote data loggers.
3.3 VPFlowScope in-line D10 & D11 (display version)
The D10 and D11 models add a 3 row display with keypad to the VPFlowScope in-line. All
parameters will be shown on the display in real time. The keypad can be used to start a data log
session or to change the key parameters of the VPFlowScope in-line. The D11 model also features a
2 Million point data logger. All output parameters for remote connection remain available on the M12
connector.
1. Menu / Enter button
2. Esc / Record button
3. Down button
4. Up button
5. LCD display
6. USB interface
7. M12 connector
3.4 VPFlowScope in-line D0 with the VPFlowTerminal
The VPFlowTerminal can be used as a remote display for situations where the local display can't be
read. All display features will be available on the remote display.
The VPFlowTerminal is equipped with a 10 m / 32.8 ft. cable with M12 8-pin connector. Therefore the
D0 model needs to be ordered with an M12 8-pin connector. The VPFlowTerminal features a 2 Million
point data logger which extends the data log capacity of your VPFlowScope in-line.

© 2017 Van Putten Instruments BV | MAN-VP-SINL-UK | Revision:1701 | Date:22-03-2017
9
4Quick start
This chapter contains the basic steps to start using your VPFlowScope in-line flow meter. Additional
information on all subjects can be found in the next chapters.
1. Unpack
Unpack the meter and check if all items are there and in good shape. A checklist with all items is
available on the box.
2. Mechanical installation
·Find the best point of installation for this product. Make sure that all specifications are met.
·For installation of the VPFlowScope in-line, the pipe needs to be cut. Mount the VPFlowScope in-
line between the pipe ends. Use tri-clamp or similar adapters for quick installation and removal.
·For installation with the tubing kit: The connection is BSP outer straight thread [For NPT thread,
chase the BSP thread of the pipe ends with a die]; 0.5", 1" or 2" depending on the VPFlowScope
in-line model.
·For installation without tubing kit: The connection is BSP inner straight thread [It can accept NPT
male thread ends]; 0.5", 1" or 2" depending on the VPFlowScope in-line model.
See chapter mechanical installation for more detailed information.
3. Electrical installation
3.1 Permanent installation
Connect a cable with 5 Pin M12 connector to the VPFlowScope in-line. The cable can be
connected to a central data acquisition / building management system or data logger via
Modbus, 4..20mA or pulse. See chapter electrical connections for more information.
Apply 12-24 VDC to power up the device. Use a Class II power supply (less than 2 Amps). If the
built-in display option is available, it will light up when power is applied.
3.2 Temporary installation
Use a 12 Volt power supply with M12 connector to power the VPFlowScope in-line. This quick
method is ideal for audits.
4. Data recording
When the data logger is available a data log session can be started by pressing the esc button and
then enter. All parameters will be logged with the default logging intervals. These logging intervals can
be changed with the VPStudio software. This software tool is also used to retrieve the recorded
sessions.

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10 VPFlowScope in-line
5 Measurement
For all parameters the update interval is 1 second. Within this second, multiple samples are taken
and averaged to provide a stable and reliable output.
5.1 Flow
The VPFlowScope in-line uses our proprietary insertion type thermal mass flow sensor. There is no
bypass flow, which results in a high robustness and less sensitivity for dirt or particles. The flow
sensor is directly temperature compensated.
The sensor response signal is directly related to
the mass flow rate and can be described by the
following formula:
Vout = k *λ* ρ * v * (Ts-Tg)
Vout = output voltage
k = sensor (geometrical) constant
λ = thermal conductivity of the gas
ρ = density of the gas
v = actual velocity in m / sec
Ts = sensor temperature
Tg = gas temperature
The optional bi-directional sensitivity is shown in
the picture on the right. In bi-directional mode the
negative flow value will show up as a minus sign.
The 4..20 mA value needs to be adapted to suit
the application. See chapter 9.1 for details.
5.2 Pressure
The VPFlowScope in-line features a built-in gauge pressure sensor. The sensor range is 0...250 psi,
rounded off this equals 0...16 bar gauge. The sensor cannot measure vacuum, please contact us if
you have a vacuum application. The sensor membrane can handle media which are compatible with
glass, silicon, stainless steel, Sn/Ni, plating and An/Ag solder.
The sensor signal is sampled with 16 bits. The practical resolution is 0.24 mbar on the 0..16 bar
scale, which is equal to 0.004 psi on the 250 psi scale.
5.3 Temperature
The built in temperature sensor measures the compressed air/ gas temperature. It is mounted in a
separate position, to ensure quick response time and low self-heating of the sensor element.
The signal is sampled with 16 bits. The resolution is less than 0.1 °C.
In a vertical pipe, with flow going down, the temperature sensor may heat up at zero flow conditions,
due to the heated flow sensor element. This effect will disappear as soon as there is consumption.
For optimal measurement performance, the VPlowScope in-line needs to be in a stable temperature
environment. When exposed to quick temperature changes or large temperature changes (for
example taking the unit from outdoor to indoor during winter time, or when mounted downstream of a
heat regenerated drier) the temperature compensation may lag behind, which may result in
significant measurement errors.

© 2017 Van Putten Instruments BV | MAN-VP-SINL-UK | Revision:1701 | Date:22-03-2017
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5.4 Totalizer
The totalizer keeps track of the total consumed amount of compressed air in normal cubic meters, or
in scf depending on which unit you choose to read out. The refresh interval is 1 second, actual
measurement data will be available on the display and by Modbus. For back up reasons, the totalizer
value is written to it's internal memory with an interval of 15 minutes. A power down might result in
maximum 15 minutes of totalizer data loss.
In bi-directional operation, negative flow is subtracted from the totalizer. The totalizer will count
backwards as the compressed air is delivered back to the supply side. The totalizer can only be
reset to zero. It's not possible to set it to a different value.
The display will show totalizer values up to 999.999,9 and will then become 0,0 independent of the
taken unit. This will not clear the internal totalizer.

© 2017 Van Putten Instruments BV | MAN-VP-SINL-UK | Revision:1701 | Date:22-03-2017
12 VPFlowScope in-line
6Mechanical installation
First select the right installation point. The installation point is crucial for the right measurements.
Sources of error can be: installation effects, unknown flow profiles, swirls, pressure and temperature
effects, humidity effects or oscillations in the flow. To ensure the highest possible accuracy of flow
measurement, the installation and piping instructions must be followed. Therefore read this paragraph
carefully.
Take into account:
·Choose a site which is accessible, which allows ease of wiring and maintenance, and which allows
you to still read and access the display if possible.
·Meet the specifications of the VPFlowScope in-line. If the specifications are not met, for instance
the pressure or temperature level is too high; this will cause inaccurate flow measurement and can
even damage your flow meter.
Avoid:
·Excessive heat, check the temperature range of your VPFlowScope in-line.
·Potential water damage on the outside. Avoid areas of high humidity and avoid dripping. Be aware
that the VPFlowScope in-line is not watertight, it is only IP65 (when mated with the USB protection
cap).
·Corrosive atmosphere where possible.
·Electrical problems (high voltage/ high power).
·Mechanical vibration and danger (walking bridges, fork lift trucks).
Warning: These devices are only for use with Air, Nitrogen, Argon, Helium, Carbon
Dioxide and other non hazardous, or non combustible gases. The maximum working
pressure is 16 bar (250 psi)
6.1 Piping table
Check the piping table below for your application. The table shows the amount of length upstream or
downstream depending on the installation. If applicable in front of the meter, use given upstream
length. If applicable in behind the meter, use given downstream length. Gas flow in pipes follows
certain rules, which must be observed for optimal measurement results. For some exceptions the
upstream length needs to be longer, or can be shorter.
If possible choose a longer upstream length, as these are minimum values. The up- and
downstream lengths are used industry wide as guidelines, but will never be a guarantee
for obtaining the “true value”. So always be careful and try to build up your own
experience from practical measurements
Piping table
The following table provides a guideline for proper distances between upstream or downstream
objects and the VPFlowScope in-line. The upstream length is the length between the last non-
straight object and the VPFlowScope in-line. If the upstream length is straight, and the distortion is
downstream of the VPFlowScope in-line, you can use the column "downstream length" as a
guideline. In very complex situations, with multiple up- and downstream objects, you should consider
another location. This table is a practical guideline and is not exact science. Practical situations can
have multiple sources of distortion, therefore VPInstruments does not take any responsibility for the
correctness.

© 2017 Van Putten Instruments BV | MAN-VP-SINL-UK | Revision:1701 | Date:22-03-2017
13
Picture
Description
Upstream
length2
Downstream
length2
Effect
Single elbow
30 * D1
10 * D1
Distorted flow profile
Complex feed-in situation
(header)
40 * D1
10 * D1
Flow profile will be
distorted
Double elbow, multiple
elbows following each
other
40 * D1
10 * D1
Distorted profile +
swirl
Diameter change from
small to large (gradual or
instant)
40 * D1
5 *D1
Jet shaped flow
Diameter change from
large to small (gradual
change, between 7 and
15 degrees)
10 * D1
5 * D1
Flattened flow profile
1 = inner diameter; 2 = minimum length
6.2 Installation without tubing kit
When you order your VPFlowScope in-line as a base model only, it is delivered without up- and
downstream piping. You can install it directly between two threaded pipe ends. Please be aware that
the connection between the pipe and the VPFlowScope in-line is very important. Any diameter
mismatch will result in higher inaccuracy. For example the inner diameter of the pipe may affect the
reading. Depending on the pipe wall thickness, the inner diameter can be smaller, which results in a
higher measurement value. If you want to be sure of the connection, ask us to supply you with the
piping kit.
The connection is BSP inner straight thread; 0.5", 1" or 2" depending on the VPFlowScope in-line
model. For NPT thread, chase the BSP thread of the pipe ends with a die.
6.3 Installation with tubing kit
If you ordered the tubing kit or a full start kit, the VPFlowScope in-line is delivered with an optimized
up and downstream piping kit, to ensure at least 20 times the pipe diameter ( for 0.5" and 1" )
upstream length. For economical reasons, the 2" model is delivered with the pipe length 15 times
the pipe diameter upstream. For optimum results, see the piping table and create additional
upstream pipe length when required.

© 2017 Van Putten Instruments BV | MAN-VP-SINL-UK | Revision:1701 | Date:22-03-2017
14 VPFlowScope in-line
Check the pipework and the O-rings, which are pre-mounted on the pipes. Apply a little O-ring grease
to ease the mounting process. Screw both pipes into the VPFlowScope in-line. Gently screw the
pipes into the flow meter inlet. Turn it all the way in, until the end of the pipe reaches the bottom of
the inlet hole
You can install the VPFlowScope in-line directly between two threaded pipe ends. The connection is
BSP outer straight thread; 0.5", 1" or 2" depending on the VPFlowScope in-line model. If necessary
you can ask our sales team to supply NPT thread on the tubing, or you can chase the thread
yourself with a die.

© 2017 Van Putten Instruments BV | MAN-VP-SINL-UK | Revision:1701 | Date:22-03-2017
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7 Display
The display provide some additional features:
·LCD display with 3 rows of real time data, refreshed every second
·Key pad with menu to configure the main settings
·Data logger with adjustable logging intervals (option)
·5 custom units (multiply and existing unit with a factor and show it on the LCD display)
7.1 Display status icons
Some status icons show feedback on the meters' status. Below is a list with explanation
Icons
Description
Sensor module is properly connected and supplied with power
No communication with the sensor [Check external power when disconnected]
A blinking dot will indicate that a data session is active
2 rotating arrows indicate that there is communication with the computer
The display is locked. The menu can not be accessed
Memory indication. Each block indicates 20% of memory usage. The blocks start to
blink if the memory is more then 95% full
7.2 LCD display
The LCD display provides 3 rows for real time data. Each row can be configured in the menu by
selecting the desired parameter for this row.
Available options are listed in menu -> display.
7.3 Data Logger
The optional integrated data logger offers you 2 Million data points. Enough to measure all three
channels 1 x per second for more than a week.
Use the following guidelines for the intervals
Application
Flow
Pressure
Temperature
Standard energy management application
5 min
5 min
5 min
Machine testing - quick fluctuations
1 sec
1 sec
1 sec
Audit - one week
10 sec
10 sec
5 min
Audit - one month
30 sec
30 sec
5 min

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16 VPFlowScope in-line
Multiple sessions can be recorded. When a session is started, a separate session will be recorded.
It's not possible to append to an existing session.
When a power failure occurs during recording, the session will be stopped. When power is restored,
a new session will start automatically.
7.4 Keypad
The key pad contains 4 buttons to control the display.
1
Menu / Enter
Used to enter the (sub)menu or to confirm a setting
2
Escape / Record
Will start a data logging session when in the data acquisition screen.
Will return from a (sub)menu when not in the data acquisition screen
3
Button down
Navigate down in the menu
4
Button up
Navigate up in the menu
Special key functions
·Lock display
In the main screen, press up and down simultaneously to lock or unlock the display. A lock icon will
appear in the right lower corner of the screen. The lock function will block keypad functionality.
·Clean re-boot.
Hold esc pressed when turning the power on. Use this option when a display will not start up or if a
session won’t stop. This can happen due to subsequent power failures at the moment that the
memory is almost full.
7.5 Menu
The menu is categorized into 3 main items which contain their own sub menu items. The complete
menu structure is shown below:
1. Settings
1. Display
2. Date and Time
3. Modbus address
4. Display dimtime
5. Display orientation
2. DAQ Sessions
1. New Session
2. Delete all
3. Advanced
1. Reset

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17
1 Settings
The settings menu can be used to change both functional parameters as display settings.
1.1 Display
The main screen of the display contains 3 rows to display measurement values. Via this menu
measurement values can be assigned to these rows. Available options in the menu are:
Measurand
Available units
Description
Empty
-
Leave this display row empty
Flow
mn/sec
m3n/h
ln/min
SCFM
m3n/min
sfps
Normalized
Pressure
bar
psi
Gauge
Temperature
°C
°F
Totalizer
m3n
Normalized
Custom
5 available units to be configured
with VPStudio. Multiply an
existing unit with a user defined
factor.
1.2 Date and Time
Adjust date and time settings. First enter the menu option and set the date with the key pad. The
date is formatted as: DD-MM-YYYY. After setting the date, confirm with enter and then enter the
time settings in format: HH:MM:SS, again confirm with enter. The new date will become active
immediately.
Date/time settings are kept actual by the real time clock until long power down. Date and time will
also be synchronized with the computer when used with VPStudio. Pressing the store button will
trigger the synchronisation.
1.3 Modbus address
The Modbus address can be changed with this option. Use the up and down buttons to change the
number. Available numbers 1 – 247.
After setting the number press enter to save the address. The power of the VPFlowScope in-line
needs to be cycled to activate the new address.
1.4 Display dimtime
The display backlight dimtime can be adjusted here. The default dimtime is set to 10 seconds. Other
Available options are:
·Fading off. The backlight will remain on.
·5 till 30 seconds with steps of 5 seconds.
Confirming with menu will make this setting immediately active.
1.5 Display orientation
The text on the display can be set upside down for installations were the VPFlowScope in-line is
installed in this way. Enter the menu item and select the desired orientation with the arrow keys.
Confirm with enter to make these settings active.
All keys will maintain their function.

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18 VPFlowScope in-line
2 DAQ Sessions
The VPFlowScope in-line contains an optional 2 Million point data logger. When available, the menu
is set to start and stop the sessions or to delete all present data.
2.1 Start session
The session will be started when you push the enter button after selecting this option. When the
session is started, the menu will close and the main screen will be shown. A blinking dot in the right
upper corner will indicate the running session. The menu will be blocked when a session is active.
The session can be stopped by pressing the esc button.
2.2 Delete all
All sessions will be deleted. It is not possible to delete just a single session.
3 Advanced
3.1 Reset
Reset the device. All peripherals will be reinitialized. This option is also needed when updating the
display firmware.

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8VPStudio software
The VPFlowScope in-line can be read out and configured with the VPStudio software. This software
can be downloaded from www.vpinstruments.com.
In case of basic configuration and read out, use the free edition. If real time logging is required,
request a license code by our sales department.
A quick start is shown below, read the VPStudio manual for more information. This manual can be
downloaded from www.vpinstruments.com/downloads
Connect the VPFlowScope in-line to the computer
The VPFlowScope in-line can be connected to the computer with the M12 connector through the JB5
interface box. This interface box combines the power and data signals. Power up the device by
connecting the 12VDC power supply to the JB5 interface box. A RS485 to USB converter can be
used to connect the JB5 interface box to the computer.
When a display is available, the VPFlowScope in-line can also be connected by USB. When
connected via USB, you can only download data log sessions and configure the display. For full
functionality you need to connect an additional DC power supply via the M12 connector. We offer a
convenient power supply for this purpose (VPA.0000.200)
Install USB drivers
A driver needs to be installed for the RS485 to USB convert or USB interface. These drivers might be
installed automatically by your windows system or need to be installed manually. All drivers are
available on our website www.vpinstruments.com/downloads.
Configure the VPFlowScope in-line
·Start the VPStudio software
·In the left white window, right click to open the menu. Now click add device
·Click the scan button to search for the right COM port. Select it and click add
·Enter a name for the device
·Now select serial for RS485 converter or USB if the meter is connected with USB
·Set the communication parameters if available
·Click add.
VPFlowScope in-line sensor read out
·Click on the device in the explorer window to read out the settings
·The status tab provides general information
·The installation tab is used to configure the settings
VPFlowScope in-line display read out [option]
·Click on the plus icon to unfold the display icon
·Click on display to read out the display settings
·The status tab provides general information
·The installation tab is used to configure the settings
·Click sessions below display to retrieve session data.

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20 VPFlowScope in-line
9Electrical connections
NEVER USE AC POWER. THIS WILL VOID WARRANTY AND BRING PERMANENT
DAMAGE TO THE ELECTRONICS. THE INSTRUMENT MIGHT BE DAMAGED
BEYOND REPAIR.
CONNECT THE M12 CONNECTOR BEFORE POWERING UP THE INSTRUMENTS.
The VPFlowScope in-line provides a 4..20 mA / pulse output and a Modbus output. All signals are
present in the M12 connector. These outputs can be used to connect the VPFlowScope in-line to a
building management system or energy monitoring system like VPVision.
Pin
Signal
Wire color*
1
+12...24 VDC
Brown
2
0 Volt
White
3
4..20 mA signal, active
Blue
4
RS485 B
Black
5
RS485 A
Grey
* Wire colors for standard VPInstruments cables
M12 5-pin female connector
Cabling
Shielded twisted pair cabling must be used for proper communication and measurement. Connect
shield to safety ground on one point. The thickness of the wires depends on the cable length. For
cabling below 300 meter | 1000 ft, use 20 awg. For longer runs use 18 awg or better.
Power supply
The input voltage is 12 to 24VDC. Make sure that the power supply is at least 12V at the connector.
Voltage drops will occur in long cables resulting in insufficient power. The display will notify you when
there is insufficient power.
9.1 4..20mA output
The 4..20mA output is an active, non- isolated linearized current loop that can be used to connect
the VPFlowScope in-line to a control system, a building/processing management system or any
4..20 mA based system.
There is one 4..20 mA output available on the VPFlowScope in-line. This output can be assigned to
one of the measurement parameters, only one can be selected. For each measurand, a number of
units is available. The factory default is m3n/hr.
Measurand
Unit
Flow
mn/sec
Flow
m3n/hr
Flow
ln/min
Flow
SCFM
Flow
m3n/min
Flow
sfps
Pressure
bar
Pressure
psi
Temperature
°C
Temperature
°F