The red-y compact series mass flow meters and regulators provide portability, flexibility, and convenience
The advanced compact unit can be equipped with various modules, including battery, power, alarm, or analog/pulse options. It is available in stainless steel or aluminum and features an intuitive backlit touch screen display, USB connectivity, and precise, reliable operation.
With AA battery and USB power supply
The touch display offers intuitive navigation. All device parameters can be adjusted through the integrated menu. Automatic display orientation adjustment via position sensor.
The flow meters offer high accuracy and dynamic range:
Accuracy ±1% of full scale
(dependent on application/range)
Dynamic range 1 : 100
The new red-y compact features 3 configurable alarms. The following alarm modes are available: Max Alarm, Min Alarm, Range Alarm, and Totalizer Alarm
The alarms can be configured with different parameters: Normally open (NO), normally closed (NC), hysteresis, reset (automatic/manual or via input contact), alarm delay, and alarm duration
In the red-y compact regulator / all-in version with manual valves, high-precision needle valves are used. These valves allow fine adjustment of the flow rate.
The red-y compact flow meters are powered by a standard AA battery. Optionally, 24 VDC and Micro-USB power supplies are available
4 expansion modules: Battery, Power Supply, Alarm, Analog/pulse out
The red-y compact units can be powered with any common Micro-USB power supply (DIN62684) Device updates can be performed using the USB interface
The MEMS semiconductor chip is the centerpiece of the thermal mass flow meter. Analog-digital conversion takes place in the sensor
In addition to the actual flow, the total consumption is displayed. Ideal for gas consumption measurements
One red-y compact measuring device can be used for up to 3 different gases or gas mixtures
Choose between a large number of standardized and normalized flow units of the Imperial, US customary and SI measuring systems (with user adjustable reference conditions). The units are selectable from the integrated menu both for the actual flow and the totalized flow
To avoid unauthorised change of settings, the menu of the new red-y compact can be locked with a password
In contrast to variable area flow meters, the digital mass flow devices are insensitive to pressure and temperature changes
High-quality components ensure long and trouble-free operation (does not apply to calibration, options and accessories)
Digital Mass Flow Meter
Measurement ranges up to 450 ln/min (480 SLPM)
Anodized aluminium or electropolished stainless steel
Digital Mass Flow Meter with manual valve
Measurement ranges up to 450 ln/min (480 SLPM)
Anodized aluminium or electropolished stainless steel
All mass flow meters are available in both anodized aluminium and electropolished stainless steel.
The red-y compact is modular in design, allowing you to choose from various modules that can be added to the base model. The modules are interchangeable and can be added later, but only one module can be used at a time.
The battery module is the default for the compact. With this module the compact can run on a single standard AA battery.
The unit also have a micro-USB connector that can be used as power supply and can also be used to update the firmware (See tab “Firmware”)
With the power supply module the compact can be powered from an external 15…30 VDC power source. The module comes with a 2 or 5 meter cable with fly leads
This power module comes with a wall plug socket power supply by which the unit runs of 100…250 VAC power. The module comes with a 1.5 meter cable and you can select a plug for EU, US, GB, AU or CN.
The alarm module option provides:
The analog/pulse module provides:
One active 4-20 mA output (adjustable 0-22 mA)
Open collector pulse output
You already have a red-y compact and would like to upgrade it with a module. Then you can buy a module: Each module can be purchased and exchanged individually. Please note that you will need to update the firmware of your compact for some modules. You can find more information under the FIRMWARE tab.
| Part number | Description |
| 328-2189 | Modification kit: AA battery supply module |
| 328-2181 | Modification kit: External power supply module 24 VDC 2m cable with fly leads |
| 328-2186 | Modification kit: External power supply module 24 VDC 5m cable with fly leads |
| 328-2190 | Modification kit: Alarm module (3xcontact, 2xinput and power supply 24 VDC). 2m cable with fly leads |
| 328-2192 | Modification kit: Alarm module(3xcontact, 2xinput and power supply 24 VDC). 5m cable with fly leads |
| 328-2201 | Modification kit: Analog/pulse module (4-20 mA out + Pulse output). 2m cable with fly leads |
| 328-2202 | Modification kit: Analog/pulse module (4-20 mA out + Pulse output. 5m cable with fly leads |
| Measuring Ranges | |
| Air / Full scale freely selectable | GCX-A from 0 … 5 mln/min* to 0 … 600 mln/min G¼” GCX-B from 0 … 600 mln/min to 0 … 6000 mln/min G¼” GCX-C from 0 … 6 ln/min to 0 … 60 ln/min G¼” GCX-D from 0 … 60 ln/min to 0 … 450 ln/min G½” *regulator 0 to 25 mln/min |
| Performance Data | |
| 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 (air & equivalents) | Eco: ± 2.0% of full scale; ranges > 200 ln/min (200 SLPM) ± 3.0% of full scale Eco plus: ± 2.0% of full scale; ranges > 200 ln/min ± 3.0% of full scale Special: ± 1.0% of full scale up to 50 ln/min (50 SLPM) |
| Turndown ratio | Eco: 1 : 50 Eco plus and special: 1 : 100 (not available below 0-10 mln/min) |
| Response time | Max. 300 msec (depending on filter settings) |
| Flow update by sensor | 40 msec (battery mode 500 msec) |
| Display update | 240 msec (battery mode 500 msec) |
| Repeatability | ± 0.5% of full scale |
| Longterm stability | 0.1 % of full scale per year, if clean gas is used |
| Power supply Meter GCM & Regulator GCR | Standard AA battery (lifetime depending on operation) or Micro-USB power supply (DIN 62684) Option: External power 15…30 VDC |
| Operation pressure | 0.2 – 11 bara (3 – 160 psia) |
| Temperature (environment/gas) | 0 – 50°C (32 – 122°F) |
| Body Materials | Anodized aluminium, optional stainless steel electropolished |
| Seals | FKM, optional EPDM (FDA) |
| Pressure sensitivity | < 0.2% / bar (<0.014% / psi) of reading (typical N2) |
| Temperature sensitivity | < 0.025% FS measuring range type per 1°C (<0.012% FS per 1°F) |
| Warm-up time | < 1 sec. for full accuracy |
| Integration & Installation | |
| Display | Touch display (128×64 px) with automatic position adjustment (position sensor) Backlighted only with external power supply (Micro-USB or 24 Vdc) |
| Process connection | G¼” (BSPP* female) up to 60 ln/min (64 SLPM) G½” (BSPP* female) up to 450 ln/min (480 SLPM) *British Standard Pipe Parallel |
| Inlet section | None required |
| Mounting orientation | Any position (consult manufacturer above 5 bar or vertical mounting) |
| Safety | |
| Test pressure | 16 bara (240 psia) |
| Leak rate | < 1 x 10-6 mbar l/s He |
| Ingress protection class | IP50 (conforms to NEMA 1) |
| EMC | EN 61326-1 |
Panel Mounting Kit for the Digital Mass Flow Meters and Regulators of the red-y compact series
We offer a range of different inlet/outlet fittings and vacuum fittings
| Type/Connection | Seals in FKM | Seals in EPDM |
| G1/4″ to 6mm | Part-N° 328-1011 | Part-N° 328-1031 |
| G1/4″ to 1/4″ | Part-N° 328-1012 | Part-N° 328-1032 |
| G1/4″ to 12mm | Part-N° 328-1013 | Part-N° 328-1033 |
| G1/4″ to 1/2″ | Part-N° 328-1014 | Part-N° 328-1034 |
| G1/2″ to 12mm | Part-N° 328-1006 | Part-N° 328-1026 |
| G1/2″ to 1/2″ | Part-N° 328-1007 | Part-N° 328-1027 |
| Type/Connection | Seals in FKM |
| G1/4″ / 1/4″ VCR | Part-N° 328-1190 |
| G1/2″ / 1/2″ VCR | Part-N° 328-1191 |
VCO® & VCR® are registered Trademarks of Swagelok
| Type/Connection | Seals in FKM | Seals in EPDM |
| G1/4″ / 1/4″ VCR | Part-N° 328-1192 | Part-N° 328-1193 |
VCO® & VCR® are registered Trademarks of Swagelok
| Type/Connection | Seals in NBR |
| G1/4″ to 6mm | Part-N° 328-1211 |
| G1/4″ to 8mm | Part-N° 328-1212 |
| G1/4″ to 10mm | Part-N° 328-1213 |
| G1/2″ to 8mm | Part-N° 328-1216 |
| G1/2″ to 12mm | Part-N° 328-1214 |
| G1/2″ to 14mm | Part-N° 328-1215 |
The digital gas mass flow meter series compact latest firmware version is 3.0.7. This version is free of charge for all compact users, is easy to install, make your compact suitable for the new analog/pulse module and enhances the performance of you unit.
Important Note: After the firmware update, it is recommended to recalibrate the touch screen See operating instructions chapter 4.12.9
To update your compact you need:
Micro-USB cable to your windows PC*
Service tool (see below)
For detailed information on updated features check the release note provided with the firmware update.
With the new firmware we also release updated operating instructions version A3-1. Hereby all technical details from previous manuals are no longer valid.
Previous versions of the firmware are available here.
 | red-y compact series Product Information | Product Datasheets |  |  |  |
| red-y compact series Panel Mounting Kits | Accessories Datasheets | | | |
| red-y compact series Alarm Module | Accessories Datasheets | | | |
| red-y compact series Operating Instructions SN>300000 | Operating Instructions | | | |
| red-y compact series Declaration of Conformity CE | Certificates/Statements | | | |
| red-y compact series Declaration of Conformity UKCA | Certificates/Statements | | | |
| red-y compact series Quick Start Guide | Operating Instructions | | | |
| red-y compact series Modules Quick Start Guide | Operating Instructions | | | |
 | red-y compact series Service Tool with Firmware Update 3.0.7 / WIN | Software | | | |
What is the impact of a different reference temperature?
The reference pressure in all units is designed for 1013.25 mbar. If you want to calculate the difference between 0 °C and 20 °C, e.g., the formula is as follows:
(flow at 0°C /273.15)*293.15
(Law of Boyle/Gay-Lussac)
Example: 100 ln/273.15*293.15 = 107,32 ls (=7.3%) This corresponds to a correction of 0.366 % per degree Celsius
How significant is the impact if the operating conditions change (pressure and temperature)?
The thermal mass flow meters and controllers directly measure the number of gas molecules (=mass), which flows past the sensor. The thermal flow measurement principle is therefore insensitive to changes in pressure and temperature. Vögtlin calibrates each unit on two temperatures and a temperature sensor in the gas stream compensates any minor temperature error due to temperature effects in the electronics. Due to this compensation there are almost no measurable temperature effects in the range of between 0…50 °C.
What reference conditions (pressure and temperature) are the devices specified for?
Unlike liquids, gases can be compressed. The volume changes when the temperature and/or the pressure change. When specifying a gas volume, the reference temperature and the reference pressure must thus also always be specified. The flow unit is than referred to as normalized (f.i. ln/min) or standardized flow (f.i. ls/min)
When we refer to “Normal” flow we in general use:
Temperature Tn = 273,15 K, corresponds to 0 °C
Pressure Pn = 1013,25 mbar abs
When we refer to “Standard” flow we in general use:
Temperature Tn = 293,15 K, corresponds to 20 °C
Pressure Pn = 1013,25 mbar abs
See also: http://en.wikipedia.org/wiki/standard conditions
Please note: Not everyone understands standard conditions in the same way. In the case of reference pressure, everyone agrees, but in the case of reference temperature, there are differences:
To avoid misunderstandings, the reference conditions are specified clearly in our correspondence.
On request, we also deliver the devices with another reference temperature.
Can the devices also be used in low pressure?
On principle, it is possible to utilize our thermal mass flow meters and controllers in the low pressure range. The sensor allows for an accurate flow measurement down to 100 mbar abs (we never verified lower pressures).
In the case of the flow regulators, a the low pressure is most of the time downstream of the control valve. The valves are vacuum-tight. The following must nonetheless be taken into consideration:
What information are required for selecting & sizing the mass flow meters & controllers?
Always provide a description of your application, why and how you want to use the units in your process.
At the very minimum we need the following information:
Does the mounting position need to be considered?
Basically, the red-y for gasflow mass flow meters and mass flow controllers can be installed in any position. At higher pressures and with dense gases such as krypton, a slight zero-point drift may occur. We therefore recommend using the devices horizontally wherever possible.
For the red-y smart pressure controllers with a small measuring range, the mounting position must be known. The dead weight of the pressure measuring cell can cause a zero point drift.
Does a massflow unit need a warm up time?
No, all red-y for gasflow devices are ready for immediate operation.
What is the impact of the moisture of the gas?
Moist gas of up to approx. 80 % rh has only a slight impact on the measuring accuracy. However, make sure that no condensation can take place in the measuring device. The condensation could settle on the sensor which could lead to inaccurate measurements. In the event that a measuring device has come into contact with condensation, it can for the most part be rinsed with a dry gas, such as N2. See also the remarks in the operating instructions.
Do I have to place a filter in the gas line to the flow meter/controller?
If you use gas from a bottle which is clean and dry, there is, in general no need for a filter.
However, there is a risk during start-up of the devices, because dirt particles could be present in the line. It is recommended to install a bypass system, so that the line can be rinsed or can be exposed in response to possible repairs.
In the event that ambient or compressed air is used, the installation of a moisture and dust filter is strongly recommended.
Troubleshooting: Is there a checklist?
Within the troubleshooting pages in the operating instructions, we have summarised error patterns, possible causes and possible measures. If you do not recognise your error pattern or the suggested action is unsuccessful, please contact your Sales Ppartner. If you return the appliance, please refer to the ‘Returns’ section in the operating instructions.
How can the devices be cleaned?
Depending on the type of contamination, the devices can be cleaned on site. You can find more information on this topic in the operating instructions.
Is there a possibility for a remote maintenance in the event of malfunction?
Yes. In some cases it is convenient when we can access the client’s PC directly and solve issues online. Please contact us!
You can download the free software TeamViewer for remote support here.
Periodic calibration: How often do the devices need to be calibrated?
In principle, the user himself determines the calibrating interval. People often use one per year or in case of very clean gas, one per 2 years. The following questions/points can be helpful:
We suggest the following calibration interval:
1. First inspection after one year
2. After several calibrations have been made in succession, the deviation of calibration to calibration must be evaluated. Based on these data, a decision can be made to adapt the calibrating intervals.
The following influences can lead to an increased deviation:
1. No stable flow, caused by pulsating pumps, e.g.
2. The gas condenses or carries along liquid or dusty particles (applications with ambient air are particularly susceptible to contaminations. A filter needs to be provided here).
3. The effective pressure deviates considerably from the calibrated pressure (+/- 0,2%/bar).
4. The gas/gas mixture is not consistent with the calibrated gas.
5. The aging of electronic components can cause changes, sometimes even improvements. Electrical changes appear as a result of aging or gradual burning of components, which impact the quality of the output signal.
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gas flow technology
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4132 Muttenz, Switzerland
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is a company of TASi Measurement
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