Vogtlin red-y compact Series User manual

Vögtlin Instruments AG
–
flow technology
Langenhagstrasse 1 | 4147 Aesch (Switzerland)
Phone [phone] | Fax [phone]
www.voegtlin.com or www.vogtlinusa.com | [e-mail]
Thermal Mass Flow Meters and Manual
Controllers for gases.
red-y compact series operating instructions (For serial number>300000)

Manual Version Page
red-y compact EN A1-7 © Vögtlin Instruments AG 02
Version: red-y compact series EN A1-7
For the latest information on our products, see our website at www.voegtlin.com or www.vogtlinusa.com
© 2015 Vögtlin Instruments AG, Switzerland
Operating instructions
red-y compact series (Serial Number >300000)
red-y compact meter GCM
red-y compact manual controller GCR

Manual Version Page
red-y compact EN A1-7 © Vögtlin Instruments AG 03
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 AG 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.

Manual Version Page
red-y compact EN A1-7 © Vögtlin Instruments AG 04
Oxygen service
Vögtlin Instruments AG 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 AG. 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, power to the device must be
disconnected. Always switch off the power before you disconnect terminal connections in
potentially dangerous surroundings to avoid sparks.

Manual Version Page
red-y compact EN A1-7 © Vögtlin Instruments AG 05
Table of contents
Copyright and Liability Disclaimer 3
Table of contents 5
1. Introduction 7
1.10 Features of red-y compact 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 13
2.12 Measurement ranges (air) 13
2.13 USB interface 14
2.14 Battery 14
2.15 External Power Module 14
2.16 Calibration 14
2.17 Operation with other gases 15
2.18 Pressure loss 15
2.19 Temperature compensation 15
2.20 Pressure compensation 15
2.21 Response time 15
2.22 Filter settings 16
3. Installation and commissioning 16
3.10 Scope of delivery 16
3.11 Mounting position and mounting location 16
3.12 Requirements for pipework 16
3.13 Fittings and filters 17
3.14 Filters / Gas cleanliness 18
3.15 Electrical power supply 18
3.16 How to replace the battery? 19
3.17 Warm-up time 19
4. Operation 20
4.10 Introduction 20
4.11 Main Menu 22
4.12 Settings 24
5. Maintenance 27
5.10 Cleaning to remove contamination 27
5.12 Returns 28
5.13 Firmware upgrade 28

Manual Version Page
red-y compact EN A1-7 © Vögtlin Instruments AG 06
6. Appendix 28
6.10 Troubleshooting 28
6.11 Pressure loss 30
6.12 Dimensional drawings in mm 32
6.13 Dimensional drawings in inches 33
6.14 Type code overview 34
6.15 Wetted parts red-y compact series 35
6.16 Contamination statement 36
6.17 Overview Default settings 37
6.18 CE Declaration of Conformity 38
6.19 Change history 39
7. Index 40
8. Overview menu red-y compact 41

Manual Version Page
red-y compact EN A1-7 © Vögtlin Instruments AG 07
1. Introduction
Thank you for choosing devices from the red-y compact series. These operating instructions will
help you to install and operate the measuring devices. Please read through these instructions
carefully before installing the devices. 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 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 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 throughtout the touch screen
Back-light screen in USB and 12-30 Vdc power mode
Power also possible with USB micro-B connector or external 12-30 Vdc (Separate module)
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

Manual Version Page
red-y compact EN A1-7 © Vögtlin Instruments AG 08
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.
The installation, commissioning and operation and maintenance must be done by appropriately
qualified personnel.
1.13 Documentation and cables supplied
Each delivery includes a CD-ROM with the manual in PDF format.
However, we recommend to visit our website where you can see the latest version of the manual
and, if available, the latest firmware version for the red-y compact.
Every unit 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.
Figure 1: The measurement principle Figure 2: Sensor signals
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.

Manual Version Page
red-y compact EN A1-7 © Vögtlin Instruments AG 09
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”
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.

Manual Version Page
red-y compact EN A1-7 © Vögtlin Instruments AG 10
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/hr). 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.
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.

Manual Version Page
red-y compact EN A1-7 © Vögtlin Instruments AG 11
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.
Figure 3: Block diagram

Manual Version Page
red-y compact EN A1-7 © Vögtlin Instruments AG 12
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 (signal suppression less than 1.7% of full scale)
Special: 1:100 (signal suppression less than 0.83% of full scale)
Response time: 500 ms (Application dependent)
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 6.15)
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)

Manual Version Page
red-y compact EN A1-7 © Vögtlin Instruments AG 13
2.10 Safety
Safety
Test Pressure: 16 Bara (232 psia)
Leak rate: 1 x 10-6 mbar*l/s He
Protection class: IP-50
EMC EN 61326-1
2.11 Electrical data
Supply voltage: Power supply red-y compact meter & regulator Standard AA
battery or USB micro-B power supply (DIN 62684)
Option: External power 12...30 Vdc (required current power
supply 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. Each element has a defined operating range that
can be defined during calibration. The flow ranges selectable below are for air/O2 and N2 only. For
other gasses consult the factory.
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

Manual Version Page
red-y compact EN A1-7 © Vögtlin Instruments AG 14
2.13 USB interface
The unit has an 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 most
Android and Windows portable phones, you can use the charger of your telephone to power the
red-y compact). It is not possible to read data from the flow meter through the USB connection.
2.14 Battery
The battery operated compact 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.
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 4.12.5 Bat auto off)
Note: When we supply the unit, the “auto power off” will be set to 15 minutes
2.15 External Power Module
As an extra option you can purchase a power supply module that, if provided with a voltage from
12 to 30 Vdc, will power the unit. This unit comes with a 2 meter cable. The Module is mounted
similar to the battery module (see 3.16 How to replace the battery?)
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).
The numbers 1 and 12 on the drawing only refer to the connection location and
identification. The power is connected to connections 1 (+ red wire) and 2 (- black wire)

Manual Version Page
red-y compact EN A1-7 © Vögtlin Instruments AG 15
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.
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 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 carefull 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 CMOS sensor itself has a very fast response time of 50 ms. However to save energy the
frequency of measurements is brought down. On average the response time is approximately 500
msec. The filter settings will also influence the response time.

Manual Version Page
red-y compact EN A1-7 © Vögtlin Instruments AG 16
2.22 Filter settings
The filter settings smooth the reading of the flow. It can be set through the set-up menu.
The filter is basically a floating average filter (also referred to a boxcar filter). It takes a defined
number of readings and calculates the average. At high filter settings, more readings will be taken
into the average. Higher filter settings will also 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)
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 shipment, 1 CD-ROM with manual(s) + Quick Start Guide
3.11 Mounting position and mounting location
We always recommend a horizontal mounting position. This can be upright, sideways or upside
down. With a vertical mounting position, dependent on the type of gas and at gauge pressures
above 5 bara (72 psia, 500 kPa(abs)), a zero-point offset can develop. 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.
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

Manual Version Page
red-y compact EN A1-7 © Vögtlin Instruments AG 17
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)
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
Sealants
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.
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 (see more information below) Please contact you
local distributor for more details.
Please note that the length of the tread on yout 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.
Types
Part No. Type/Connections Material
328-1001 G¼˝ to 6 mm Stainless steel, FKM
328-1002 G¼˝ to ¼˝ Stainless steel, FKM
328-1003 G¼˝ to 12mm Stainless steel, FKM
328-1004 G¼˝ to ½˝ Stainless steel, FKM
Pressure loss (air)
Flow rate Pressure loss G¼” Flow rate Pressure loss G½”
5 ln/min 2.2 mbar 50 l/min 5 mbar
20 ln/min 25 mbar 100 l/min 10 mbar
40 ln/min 85 mbar 200 l/min 30 mbar
60 ln/min 180 mbar 300 l/min 70 mbar
400 l/min 140 mbar
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.

Manual Version Page
red-y compact EN A1-7 © Vögtlin Instruments AG 18
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 can be provided with power from a standard AA battery or from a common USB
micro-B charger that you typically use for the changing of your phone. There is an optional module
by which you can apply a 12 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)
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 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 once every 10 minutes, so the stored
value will never be older than 10 minutes)
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.

Manual Version Page
red-y compact EN A1-7 © Vögtlin Instruments AG 19
3.16 How to replace the battery?
The battery is in plastic compartment
mounted above the body and connected to
the main display/electronics housing. This
plastic part has 3 notches on each side. With
one hand hold the housing on the sides of
the display and with your other hand grab
the side where the plastic notches are
located. Pull the battery compartment from
the main housing. Replace the battery and
push the battery compartment back on the
main housing.
By pushing the battery compartment into
place you automatically connect the battery
to the electronics. It will take a few seconds
for the meter to start up.
You have to press the screen in order to
switch the unit on. Replacing the battery will
not automatically turn on the unit.
Inserting the battery incorrectly will not
damage the unit.
Please dispose of the
battery on an
environmental
friendly way

Manual Version Page
red-y compact EN A1-7 © Vögtlin Instruments AG 20
3.17 Warm-up time
All instruments of red-y line are ready for use within seconds of connecting the power. There is no
significant warm-up time (<5 sec).
4. Operation
4.10 Introduction
The red-y compact has a touch screen based on pressure. You can operate the screen with your
finger or an object that does not create any scratches on the display.
The display has a backlight that only operates if the unit is powered by an external power source.
To start the unit, insert a battery or connect an external power supply. Press the screen for at least
3 seconds until the unit switches on. When connecting the unit to an external power source it will
be turned on automatically.
Once you switch the unit on you are able to access a menu structure with which you can adjust the
meter for your specific applications and preferences.
Before you put the unit into operation verify that the unit is suitable for your application (gas, range,
pressure and temperature). You find these details on the supplied calibration sheet. If any of these
details deviate from your application please contact the factory
4.10.1 Start-up screen
When the unit starts up, it will show a startup screen for 4 seconds (Screen name: Sensor mode).
After this screen you will see the main home screen that indicates the flow and totalized value.
On the right top you see if the unit is running on battery or external power. The bar graph on the
left of the display represents the current flow graphically. The display also shows the selected gas
and the selected measuring units.
The resolution of the numbers is automatically adjusted and cannot be set by the user.