Vogtlin red-y compact Series User manual

Vögtlin Instruments GmbH
Langenhagstrasse 1 | 4147 Aesch (Switzerland)
Phone [phone] | Fax [phone]
www.voegtlin.com | [email protected]
Thermal Mass Flow Meters and Manual
Regulators for Gases
red-y compact series operating instructions (For serial number>300000)

Manual
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red-y compact 2
EN A2-2
© Vögtlin Instruments GmbH
02
Version: red-y compact 2 series EN A2-2
For the latest information on our products, see our website at www.voegtlin.com
© 2019 Vögtlin Instruments GmbH, Switzerland
Operating instructions
red-y compact 2 series (Serial Number >300000)
red-y compact meter GCM
red-y compact regulator GCR
red-y compact meter with alarm module GCS
red-y compact regulator with alarm module GCA
This manual is updated for the latest firmware version of the red-y compact 2. Please verify
that your unit is updated with firmware version 3.0.6 available from our website (see chapter
5.12 Firmware upgrade).

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Copyright and Liability Disclaimer
All rights reserved. No part of this publication may be reproduced in any form or by any means
without the publisher's prior written permission.
The content of this manual is provided for information only and may be altered without prior notice.
Vögtlin Instruments GmbH assumes no responsibility or liability for any errors or inaccuracies in
this manual.
This symbol alerts the user to important operating, maintenance and service
information.
Important instructions
Do not remove the electronics housing. A damaged hologram seal will void the warranty.
There are no serviceable parts inside the unit.
Repairs must only be performed by qualified personnel
Attention
This unit has several power supply possibilities. If you use the external 24 Vdc power supply, it is
strongly recommended to have this device grounded.
Subject to change
Due to our policy of ongoing product development, we reserve the right to change the information
in this manual without notice.
Recycling
Note the existing regulations of your country.
Toxic, flammable gases and ATEX
In the case of toxic and flammable gases, the respective safety guidelines in each country must be
followed. This red-y device is NOT Ex certified. In the case of flammable and toxic gases, fittings,
cable glands and pipes intended for that purpose must be used. The responsibility for safe
operation lies with the user and designer of the facilities.

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Oxygen service
Vögtlin Instruments GmbH is not liable for any damage or personal injury, whatsoever, resulting
from the use of our standard mass flow meters or controllers for oxygen gas. You are responsible
for determining if this mass flow meter or controller is appropriate for your oxygen application. You
are responsible for cleaning the mass flow meter or controller to the degree required for your
oxygen flow application.
Trademark
red-y is a Registered Trademark of Vögtlin Instruments GmbH. Other product and company names
listed in this manual are trademarks or trade names of their respective manufacturers.
Receipt of your instrument
When receiving the instrument, carefully check the outside packing carton for damage that may
have incurred during shipment. If the carton is damaged, notify the local carrier and submit a report
to the factory or distributor. Remove the packing slip and check that all ordered components are
present and match your specifications (as ordered). Make sure any spare parts or accessories are
not discarded with the packing material. Do not return any equipment to the factory without first
contacting one of Vögtlin Technical Support Centres:
E-mail Customer Service:
[e-mail]
Installation
Please note before the start-up:
Do not use sealing tape or liquid sealant
Piping must be cleaned before installation of instrument.
Products in this manual may contain metal or elastomer seals, gaskets, o-rings or valve seats. It is
the “user’s” responsibility to select materials that are compatible with their process and process
conditions. Using materials that are not compatible with the process limitations of the device, may
result in equipment damage and/or personnel injury or death.
It is recommended that the user check the devices on a regular schedule to ensure that it is leak
free as both metal and elastomer seals, gaskets, o-rings and valve seats may change with age and
exposure to process gas.
Power
If it becomes necessary to remove the instrument from the system or change a battery, the power
to the device must be disconnected. Always switch off the power before you disconnect terminal
connections in potentially dangerous surroundings to avoid sparks.

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Table of contents
1. Introduction 7
1.10. Features of red-y compact 2 thermal mass flow meters 7
1.11. Scope of warranty 7
1.12. Instructions and warnings 8
1.13. Documentation and cables supplied 8
1.14. The measurement principle 8
1.15. Real, Standardized and Normalized flow 9
1.16. CMOS technology 10
1.17. Block diagram 11
2. General device specifications 12
2.10. Safety 13
2.11. Electrical data for meter GCM and regulator GCR 13
2.12. Measurement ranges (air) 13
2.13. USB interface 14
2.14. Battery 14
2.15. Optional modules 15
2.16. Calibration 16
2.17. Operation with other gases 16
2.18. Pressure loss 17
2.19. Temperature compensation 17
2.20. Pressure compensation 17
2.21. Response time 17
2.22. Filter settings 17
3. Installation and commissioning 17
3.10. Scope of delivery 17
3.11. Mounting position and mounting location 18
3.12. Requirements for pipework 18
3.13. Fittings and filters 19
3.14. Filters / Gas cleanliness 19
3.15. Electrical power supply 19
3.16.How to replace the battery? 21
3.17. Warm-up time 22
4. Operation 22
4.10. Introduction 23
4.11. Main Menu 28
4.12. Settings 36
5. Maintenance 42
5.10. Cleaning to remove contamination 42
5.11. Returns 43
5.12. Firmware upgrade 44

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6. Appendix 45
6.10. Troubleshooting 45
6.11. Pressure loss 47
6.12. Dimensional drawings ¼” in mm 49
6.13. Dimensional drawings ¼” in inches 50
6.14. Dimensional drawings ½” in mm 51
6.15. Dimensional drawings ½” in inches 52
6.16. Type code overview 53
6.17. Wetted parts red-y compact 2 series 54
6.18. Contamination statement 55
6.19. Overview Default settings 56
6.20. CE Declaration of Conformity 58
6.21. Change history 59
7. Index 60
8. Overview menu red-y compact 2 62
Space for notes and remarks by user: 65

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1.Introduction
Thank you for choosing devices from the red-y compact series. These operating instructions will
help you to install and operate these gas flow measuring devices. Please read through these
instructions carefully before installing the unit. Our aim has been to write a full and practical guide.
We would be grateful if you would notify us of any shortcomings or mistakes.
Please contact your sales partner if you have questions about any aspect of the products.
The red-y compact 2 is a thermal based mass flow meter that can measure the mass flow of
gases. The core element of the red-y thermal mass flow meter is a CMOS sensor chip. The
sensor and parts of the electronics are on one board and offer a number of advantages for the
user.
1.10. Features of red-y compact 2 thermal mass flow meters
In developing and manufacturing the devices, we have focused primarily on customers and their
applications. Our aim is to implement customers' requirements in the form of new developments or
enhancements on an ongoing basis. The essential features are:
Compact design
Battery operated optional (Portable)
Dot-matrix LCD touch screen
Multiple gases possible (3 gases)
Flexible due to the many different settings accessible through the touch screen
Back-light screen in USB and 8…30 Vdc power mode
Power also possible with USB micro-B connector or external 8…30 Vdc (Separate module)
Optional alarm module with power, 3 contacts and 2 inputs
Display can be rotated 180 degrees
Fast and accurate measurement and control
Integrated temperature compensation and flow totalizer (standard)
Easy to maintain and service
Firmware upgradable through USB connection
3-year warranty
1.11. Scope of warranty
Warranty for the red-y compact product line extends to material and manufacturing defects only.
Maximum warranty covers product replacement free of charge. The following causes of
faults/damage are not covered under warranty:
Use outside the operating limits
Damage due to corrosion
Damage due to leaking batteries
Mechanical damage in general
Contamination due to improper sealing
Contamination due to impure gases or penetration of liquids
Damage to electronic components due by over-voltage or electrostatic discharges, and
corrosion damage due to aggressive environments
Functional failure due to incorrect operation or faulty parameterization
If the unit has been opened or otherwise tempered with
Drift in the calibration
EEPROM damage

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1.12. Instructions and warnings
Read all of the operating instructions thoroughly before installing and commissioning equipment.
Misconceptions and incorrect use can lead to breakage of the measuring device or risk of personal
injury. Should one of these cases occur, the responsibility lies solely with the operator of the
device.The installation, commissioning and operation and maintenance must be done by
appropriately qualified personnel.
1.13. Documentation and cables supplied
A printed quickstart quide is shipped together with each device. However, we recommend to visit
our website to obtain the latest version of the manual and the latest firmware version for the red-y
compact 2.
Every device comes with a USB A to USB Micro-B cable. This cable can be used to power the unit
and to upgrade the firmware.
1.14. The measurement principle
The thermal mass flow measurement principle is particularly suitable for the measurement and
control of clean and dry gaseous media. The most significant advantage is that the measurement
process measures the real mass flow and is largely independent of temperature and pressure.
Stated simply, the thermal measurement principle measures the heat transport by gas flowing past.
In the case of red-y mass flow measuring instruments, a constant heat input gives a flow-
dependent temperature difference (∆T). Two temperature sensors are positioned in the measuring
channel (T1, T2), one before the heating system (H) and one after it.
If there is no flow, the heat spreads symmetrically in directions T1 and T2. The temperature
difference T1-T2 is therefore zero.
Flow rates > 0 create a temperature difference.
The sensor T1 at the inlet is cooled by the gas flowing past it, and the temperature of the second
sensor T2 rises due to the heat drawn from the heating system.
The temperature difference is related non-lineary to the mass flow, with very high repeatability. The
electronics will, based on the calibration, convert this temperature difference in a linear and
proportional indication of the mass flow of the gas.
Figure 1: Measurement principle
Figure 2: Sensor operation

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1.15. Real, Standardized and Normalized flow
The user-selectable engineering units of the red-y compact has been divided in two groups: “Real
and Normal” units and “Other units”
This separation is not only there to find the unit you want to select quicker, it also separated the
“Normalized flow” from the “Standardized flow”
Figure 3: Units menu
The red-y compact has basically 2 reference conditions: One for “Real and Normal” units and one
for “Other units”
The factory setting is as follows:
1) For all units that are used in "normal" (like ln/min), the reference conditions are always 0°C
and 1013.25 mbara. This cannot be adapted.
2) For all the other units that are “standard” (like ls/min and sccm) and the l/min the reference
conditions has to be be defined when the unit is ordered.
The reference value for all units that are not “Normal” or “Real” it has to be defined with the
purchase order. It cannot be changed after the units has been delivered.
On the sticker of the red-y compact we will mention a reference condition. This reference condition
is for the “Standard” units only. The “normal” units will always be 0°C and 1013.25 mbara.
In future version of the firmware the reference conditions will be adjustable in the menu.
> Flow
> Totalizer
> Real and Norm
> Other units
> Real and Norm
> Other units
If the unit name is “normal” than we select
0°C and 101325 pa as reference conditions.
If it is anything else the customer can set the
reference conditions. (Factory default is 20°C).
Real mass units (f.i. kg) have no reference settings.
mls
ls
m3s
sl
l
cc
scc
scf
□
□
□
□
□
□
□
□
mln
ln
m3n
g
kg
lb
□
□
□
□
□
□□
□
□
□
□
□
□
□
□
□
□
□
□
□
□
nlpm
ln/h
nlph
mln/s
mln/min
mln/h
ln/s
ln/min
m3n/h
g/s
g/min
g/h
kg/h
kg/min
lb/min
lb/h
□
mls/s
mls/min
mls/h
ls/s
cc/s
m3s/h
ls/min
slpm
slph
sccs
ls/h
sccm
cc/min
cc/h
l/min
l/h
l/s
□
□
□
□
□
□
□
□
□
□
□
□
□
□
□
□
□
scfm
scfh
□
□

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Gas flow in general can be expressed in one of the following:
Volumetric flow: (f.i. l/min). This theoretically cannot be measured by the red-y compact
because it is volume. The compact measures mass flow. However, due to regional
requirements we still have it as a flow unit that is selectable. Units shown as volume (l/min)
refer to the customer defined reference conditions (Same as “standard”)
Real Mass flow: (f.i. kg/h). This refers to true mass units per time unit. The red-y compact
can measure this and you can select this type of unit from the menu.
Normalized volumetric flow: Normalized means that the units are “translated” to predefined
pressure and temperature conditions. Normalized or Normal Conditions refers to 0°C and
1013.25 mbar absolute. You can select this type of unit from the menu of the red-y
compact. These units are mostly used in Europe and China.
Standardized volumetric flow: Standardized means that the units are “translated” to
predefined pressure and temperature conditions. Standardized or Standard conditions
refers to 20°C (68°F) and 1013.25 mbar (=760 mmHg) absolute. You can select these type
of units from the menu of the red-y compact. These units are mostly used in the USA.
Standardized can also refer to other reference conditions (f.i. Natural Gas industry often
uses 15°C and 1013.25 mbar absolute. In the semicon world they often use 25°C and
1013.25 mbara. Please define and mention these reference condition at the time of your
order.
Please note that reference condition relating to Normalized or Standardized volumetric flow are
NOT the operating conditions. According to the ideal gas law, the gas volume will change by
0.35% per K.
Please note that Vogtlin standard uses the following densities for their main 3 gasses:
Air: 1.293 gr/m3, N2: 1.2504 gr/m3, O2: 1.429 gr/m3 (All at 0°C and 1013.25 mbar absolute). If you
use other densities or need additional information for other gasses, please contact the factory.
Densities need to be defined before manufacturing and cannot be adjusted once the unit has been
delivered.
1.16. CMOS technology
The red-y measuring and control devices are equipped with an innovative CMOS semiconductor
sensor that sets new standards for accuracy, speed and measurement dynamics.
With our CMOS technology the sensor element, amplifier and A/D converter form a single silicon
chip.

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1.17. Block diagram
The following GCM block diagram shows the structure of the device. The block diagram does not
show the optional manual control/needle valve (Model GCR) that would normally be placed on the
outlet of the unit.
Turbulence
filter By-pass
Touch Display
(dotmatrix 128x64 Px) Micro processor
EEPROM
USB
Interface
Power
conditioning
Sensor
Figure 4: Block diagram

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2.General device specifications
Media (real gas calibration): Air, O2*, N2*, He, Ar, CO2, H2, CH4, C3H8
(other gases and gas mixtures on request)
*O2 & N2 are calibrated with air.
Accuracy:
Eco:
±2.0% of full scale; Ranges > 200 ln/min ±3.0% of full scale
Special:
±1.0% of full scale (only G¼” instruments and real gas calibrations)
Dynamics:
Eco:
1:50 (Meter reads zero if flow is less than 1.7% of full scale)
Special:
1:100 (Meter reads zero if flow is less than 0.83% of full scale)
Response time:
Maximum 300 msec (filter setting dependend)
Flow update by sensor
40 ms (Battery mode 500 ms)
Display update
240 ms (Battery mode 500 ms)
Repeatability:
±0.5% of full scale
Long-term stability:
< 1% of reading / year
Temperature coefficient:
< 0.025% FS measuring range type per °C
< 0.012% FS measuring range type per 1°F
Pressure coefficient:
< 0.2% / bar of reading (typical N2)
< 0.014% / psi of reading (typical N2)
Working pressure range:
0.2 - 11 bara (3-160 psia)
Test pressure:
16 bara (232 psia)
Storage conditions:
-20 to 80°C (-4 to 176°F), 0-95% RH, non-condensing
Temperature range:
0 –50°C (32 bis 122°F), 0-95%, RH, non-condensing
Do not expose device to direct sun light.
Warm-up time:
< 5 sec. for full accuracy
Materials
Electronics housing:
ABS (Acrylnitril-Butadien-Styrol)
Body Material:
Anodized aluminium or stainless steel 1.4404 (316L)
Sensor area:
Silicon, glass, epoxy
Seal material:
FKM, optional EPDM (FDA compatable)
Wetted parts:
See appendix (see chapter 6.17 Wetted Parts List)
Integration
Display:
Touch display 128x64 px
Backlighted only with external power supply (Micro-USB or 24 Vdc)
Process connection:
G¼" (BSPP* female) up to 60 ln/min,
G½" (BSPP* female) up to 450 ln/min
*British Standard Pipe Parallel
Inlet section:
None required
Mounting orientation:
Any position (consult manufacturer above 5 bara (72 Psia) if the
compact will be mounted vertical)
Connection cable:
For external power supply: 2 m with loose ends (fly leads)

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2.10. Safety
Test Pressure:
16 Bara (232 psia)
Leak rate to external:
1 x 10-6 mbar*l/s He
Protection class:
IP-50
EMC
EN 61326-1
2.11. Electrical data for meter GCM and regulator GCR
Supply voltage:
Power supply red-y compact 2 meter & regulator Standard AA
battery or USB micro-B power supply (DIN 62684)
Option: External power 8...30 Vdc, 120 mA. We recommend a
power supply with a minimum current of 150 mA.
(Power supply hereafter refered to as the 24 Vdc power supply)
2.12. Measurement ranges (air)
The red-y compact has 4 different flow elements available. Each element has a defined maximum
operating flow range that will be defined during calibration. The flow ranges selectable below are
the maximum flow ranges for air/O2 and N2 only. For other gasses consult the factory.
These ranges are adjustable electronically during factory configuration to your desired full scale
range.
Type Measurement full scale (air), scale freely selectable
compact meter GCx: GCx-A from 50 mln/min to 600 mln/min
GCx-B from 600 mln/min to 6000 mln/min
GCx-C from 6 ln/min to 60 ln/min
GCx-D from 60 ln/min to 450 ln/min

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2.13. USB interface
The unit has a female USB micro-B connection (DIN 62684) that can be used as an external power
supply and to upgrade the firmware. USB micro-B is the same connector you find on older Android
and Windows portable phones, you can use the charger of your telephone to power the red-y
compact 2.
It is not possible to read data from the flow meter through the USB connection.
2.14. Battery
The battery operated compact 2 can operate on any common AA battery. The lifetime is strongly
dependent on the usage and the quality of the battery. In general we can state that the battery
lasts for about 3-6 months under non-continuous use. (see Note 1+2)
We recommend to use external power (USB micro-B or 24 Vdc) if you application needs
continuous measurement like measuring totalized flow. To extend the lifetime of the battery, the
back-light is disabled during battery operation, you cannot activate it. We strongly recommend to
use the “auto power off”in the menu for battery driven devices (see chapter 4.12.7 Battery auto off)
More information on the battery in chapter 3.15 Electrical power supply and 3.16 How to replace
the battery?.
Note 1: When we supply the unit, the “auto power off” will be set to 15 minutes
Note 2: The unit can be set to performance mode when powered from the battery, this will strongly
increase the battery usage. See chapter 4.12.1 Measurement for more information.

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2.15. Optional modules
As an additional option you can purchase a power supply or an alarm module.
2.15.1. Power supply module
The power supply module, is provided with a voltage from 8 to 30 Vdc, will power the unit. The
unit comes with a 2 meter cable.
2.15.2. Alarm module
The alarm module provides 3 individually
settable alarms and 2 inputs. Each alarm can
be set by the customer. The module is
supplied with a 2 meter fly-lead cable and
needs to be powered by 8…30 Vdc which
also powers the compact flow meter.
Each of the 3 alarm contacts can be
configured as high, low, window and totalizer
alarm. Once the alarm becomes active, the 3
potential free alarm contacts can be reset in
many different ways. Automatic, through the
touch screen or with one of the 2 input
signals. Other options like hysteresis settings
and delays (timers) are also available.
The 2 input contacts or customer set alarm
conditions can also be used to reset the
totalizer.
For detailed information see 4.11.2 Alarm
Menu in this manual.
Power in
Figure 5: Power and Alarm module wiring

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Both the power and the alarm module are mounted similar to the battery module (see 3.16 How to
replace the battery). They replace the battery module, so you cannot use these modules in
combination with battery power.
An external magnet can unintentionally influence the alarm contacts.
Generic specifications optional alarm module GCA
Power input:
Voltage supply range : 8… 30 Vdc (Power supply hereafter refered to as the 24 Vdc power supply)
Max. current : 300 mA
Protection input: Polyfuse (trip current > 500mA) and reverse polarity protected
Switch ratings switch 1 + 2 (SPST hard contact):
Maximum current
0.5 A
Maximum voltage
30 Vdc
Relais lifetime
> 5 million
Switch ratings switch 3 (DPST contact):
Maximum current
1 A
Maximum voltage
30 Vdc
Relais lifetime
> 5 million
Inputs 1 + 2 (Opto-couplers):
Voltage range (polarity sensitive): 5 –30 Vdc (@ 5mA max)
Min. recommended pulse width
100 msec (Sample interval: 20 msec)
2.16. Calibration
Each measuring device is supplied with a factory calibration report. The calibration is traceable to
American and/or European standards. On request we can also provide DAkkS calibration (German
Accreditation Body).
2.17. Operation with other gases
Each measuring device can store data for up to 3 types of gas or operational states that need to be
defined at the time of purchase.
CMOS gas flow sensors are not linear (The output is linearized) and respond different to each gas.
If the gas or gas composition is different than the gas that the unit was calibrated for, the unit will
not measure accurately. It is possible to program up to 3 different gases and gas mixtures, but this
needs to be done at the factory or at a Vögtlin certified calibration center. Please note that the so-
called K-factors as used in the traditional capillairy MFM/MFC cannot be used for CMOS mass flow
meters. Please contact the factory for additional information.
Note:
Please note that, among other effects, the zero-point error (offset display) will be higher if the
device is not operated with the type of gas, for which it had been calibrated. A difference in zero
indication is also possible if the used pressure is different than specified.

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2.18. Pressure loss
Our thermal mass flow meters have a low pressure drop. The pressure drop depends mainly on
the medium, the pressure conditions and the flow rate. In chapter 6.11 Pressure Loss you find the
pressure drop for the most common gases. Your sales partner has a calculation program for the
other gases. Please note that the size of the pipes has a large effect on the pressure loss. For
example from around 60 ln/min, we recommend a pipe inside diameter of at least 10 mm.
Please also note that some fittings have a reduced diameter and can cause considerable pressure
drop in your system. Be especially careful with vacuum applications, please select a relative big
pipe diameter).
2.19. Temperature compensation
The red-y compact thermal mass flow meters measure the mass flow of gases, the result being
largely independent of pressure and temperature. In addition to the fundamental principle an
internal sensor measures the gas temperature and, with the help of a 3-dimensional table of
interpolation values, a correction factor is calculated automatically. The flow indication is thus
temperature-compensated.
2.20. Pressure compensation
During calibration, the specified operating pressure is taken into account. Changes to the pressure
conditions may introduce an additional error. This is around ±0.2% per bar.
Please note that the control behavior is influenced by substantially different pressure conditions.
(relevant for units with an intergrated needle valve only)
2.21. Response time
The response time is time required to display 98% of its final value after a sudden change in flow.
This response time for the compact 2 is around 300 ms but is dependent on your filter settings. On
battery operation you might experience a slower response time than on external power. (See
chapter 4.12.1 Measurement for more information.
2.22. Filter settings
The filter settings smoothens the reading of pulsating or noisy flows. It can be set through the set-
up menu.
Higher filter settings will slow down the response time of the unit.
(Please always first try to find and remove the cause of your noisy or pulsating flow e.g. add
volume to your system). More information on the filter settings in chapter 4.12.4 Filter
3.Installation and commissioning
3.10. Scope of delivery
We ship the device with the following accompanying documentation:
With each device: 1 factory calibration certificate per ordered calibration
With each device: final inspection report
With each device: USB cable + 1 x AA battery (if battery powered)
With each device: 1 quickstart guide

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3.11. Mounting position and mounting location
Although the recommend mounting position is horizontal, the unit can used be upright, vertical or
upside down. With a vertical mounting position, dependent on the type of gas and at pressures
above 5 bara (72 psia, 500 kPa(abs)), a zero-point offset can be possible. This effect is caused by
convection in stationary media.
With regard to mounting location, the following situations can cause problems:
Strong heat sources, or ambient temperatures outside the specification
Strong sources of electromagnetic radiation such as spark discharges
Humid environments and the associated condensation lead to damage of the electronic
components
In general, aggressive environments reduce the service life.
Liquid running backwards can penetrate into the measuring instrument. An elevated
mounting location generally helps, or using check valves.
If your ambient air contains high humidity and at night the temperature goes down, it is
possible that you will get some condensation inside the unit. Please take precautions to
avoid this.
At installation make sure to respect the flow direction of the gas. It is
indicated by an arrow on the back side of the instrument’s housing.
3.12. Requirements for pipework
The most common causes of faults concern the way that devices are connected to the gas supply.
Please note the following points:
The pipes must be absolutely clean. Please flush them before installing the measuring
instruments!
Please ensure there are no pieces of thread sealant (f.i. Teflon tape) in the piping!
Use appropriate pipe materials (pressure rating, durability)
Even when connected to fixed pipework, we recommend that the devices are mounted
using the appropriate mounting holes
From 50 ln/min, we recommend the following flow-calming sections of straight and
unobstructed straight tubing: Inlet: 10 x diameter; outlet: 5 x diameter
Use appropriate fittings (see chapter 3.13 Fittings and filters).
Malfunctions can be caused by unstable pressure controllers, pumps that oscillate, and
volumes before and/or after the measuring device that are generally too small. Install an air
reservoir with 2 liter volume in the feed pipe (2 liter is an example, the volume depends on
the application).
The size of the pipe must be matched to the measuring/control device. A diameter that is
too small results in an increased pressure drop.
Check for any leaks before commissioning the devices.
For maintenance work, we recommend that a bypass system is used. This is particularly
important where the gas supply must not be interrupted.

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3.13. Fittings and filters
You can order a wide range of process fittings and adapters for
the compact. Some compression fittings are available with an
internal 50μ filter. Please refer to our website contact you local
distributor for more details. Please also consider that fittings and
filters can create additional pressure drops over the flow meter.
.
Installation
The fittings are supplied in pairs: they preferably should be installed with filter at the inlet and
without filter at the outlet. The fitting with a filter must be installed at the inlet (as determined by the
flow direction). The sealing rings (O-rings) must not be damaged during assembly.
For more information, see the data sheet for the fittings.
3.14. Filters / Gas cleanliness
We always recommend that a filter, or at least a fine-mesh sieve (50 microns), is installed before
the measuring devices. It often happens that solid matter such as welding residues, metal or
plastic chips, rust, sealing tape, etc. affect the function.
In pressurized-air applications using compressors, the air must be dry and free of oil. Please
ensure that a suitable processing unit is located before the devices. In the case of gases from
cylinders, in general no filter is needed. For more information, see chapter 5. Maintenance.
3.15. Electrical power supply
The red-y compact 2 can be provided with power from a standard AA battery or from a common
USB micro-B charger that you typically use for the charging of your android phone. There are
optional modules by which you can apply a 8 to 30 Vdc external power.
The lifetime of the battery strongly depends on the type and quality of the AA battery you use. We
recommend (and determine the specifications with) an Alkaline-Manganese Dioxide Battery with a
capacity of 3000 mAh (ANSI: 15A IEC: LR6)
Figure 6: 316SS Compression fittings
The design of the devices enables sealing at the ends with O-rings or flat seals. It is
essential that you avoid:
the use of sealing tape to seal threads. Small pieces can cause incorrect
measurements and control-valve malfunctions. As well as that, if the device
has to be checked or recalibrated, there will be an extra charge for the
additional cleaning work.
sealing with liquid sealants will incur a higher cleaning charge for cleaning the
device in an ultrasonic tank.
Please note that the length of the tread on you fitting that is screwed inside the body is
for the G¼˝ no longer than 10mm (⅜”) and for the G½˝ no longer than 13mm (½˝) to
avoid internal damage.

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Other types of batteries (for instance Zinc Carbon, Zinc Chlorine, NiCd, NiMH or Li-ion) can be
used, as long as the voltage is 1.2 to 1.8 Vdc. Using other batteries will influence the life of the
battery when used in the red-y compact 2 flow meter.
It is also possible to use rechargeable batteries, but the unit will however not charge the battery if
powered by the USB micro-B.
We strongly recommend to remove the battery from the case if you do not use the meter for longer
periods of time to avoid damage to the flow meter in case the battery starts to leak. The unit will
retain its settings so when you re-insert the battery the settings will be the same as when you took
it out. (The totalizer will be stored to the non-volatile memory in an interval that you can set. See
chapter 4.11.3 Totalizer)
There is no need to remove the battery if you connect the USB power supply. When you run the
unit on power from the USB micro-B and have a battery inserted, you can remove the USB
connector and the battery automatically takes over.
When the unit is powered by the battery you will not see the backlight to conserve energy. The
backlight is only operational when there is a power supply other than a battery and the unit is not in
ECO mode. (See chapter 4.12.1 Measurement for more information)
When you replace or install a battery, all power to the unit should be disconnected.