A Special Announcement From Servoflo

Posted by David Ezekiel on May 21, 2024 9:00:00 AM

Today we have important news to share with you. After 34 years, Servoflo will discontinue its distribution business at the end of 2024. The global nature of our business has dictated that we seek a larger partner to serve our loyal customers who frequently design, source, and manufacture in all corners of the globe.

To that end, we will transition many customers to Angst+Pfister this year. Angst+Pfister (A+P) is an international distributor and manufacturer, headquartered in Zurich, Switzerland. They have a US division and lengthy experience with many of our factory partners in Europe. Our long-standing global relationship with A+P makes us confident you will be in good hands with them.

What does this mean for you, our cherished customer?

All current orders will be shipped as committed by Servoflo.  Expediting is possible as long as our inventory can meet an earlier date. All orders remain non-cancellable and non-returnable. If we have an excess inventory of parts you have previously ordered, we can accept orders anytime. In principle, A+P will begin accepting orders in May 2024. For the next several months, we will work closely with A+P to ensure a smooth transition of key personnel and business practices. Those with blanket orders, please be assured we will work closely with you to ensure you receive all your deliveries and we will put you in touch with the appropriate contacts for future orders. We will handhold every customer during this transition.

A+P will become the North American representative for Fujikura, Sensormate, Metallux, Consensic, HYB, and Siargo. While our two companies will not overlap in order taking, Servoflo will support A+P and our customers during this critical transition. A+P is a large, worldwide organization with in-house technical experts in various sensor technologies, applications, and architectures. Angst+Pfister can be contacted via their email box info.apus@angst-pfister.com for any sample, quote, order, or technical information request. For all other factories not mentioned, you may contact them directly.

Our factory partners have been fully supportive of this transition as they see the potential of A+P to support you:

"Fujikura has worked with Angst & Pfister in Europe for over 30 years. We are pleased to extend our relationship to North America with the new U.S. division of Angst & Pfister. We are confident our customers will be in capable hands." - Jason Peng, President of Fujikura America, Inc.

“Metallux is grateful for Servoflo’s past work in North America, and we are looking forward to continuing our growth and presence with our new Angst & Pfister partnership. We are confident in their technical knowledge and professional expertise.” – Massimo Romano - General Manager, Metallux SA

“Sensormate is excited to be part of the Angst & Pfister team in North America" - Leo Wu, President of Sensormate Enterprise Co., Ltd.

If you have any questions or concerns, contact us at info@servoflo.com or reply to this email. You may also call our office at 781-862-9572.

We are eternally grateful and humbled to have been in this business for 34 years. We have enjoyed this journey and have been privileged to learn from our customers who design and manufacture the best products in their markets.


David Ezekiel, Owner

About Angst+Pfister

Angst+Pfister is a leading supplier of technical components and comprehensive solution provider for a wide range of industries and has been ensuring business continuity and serving the world’s leading manufacturers for over 100 years. Their professional capabilities center on being an engineering-led solution provider with in-depth customer application knowledge; globally sourcing a wide range of high-quality standard and customized industrial components; and proactively serving original equipment manufacturers (OEMs) around the globe through multiple sales channels.

Angst & Pfister

Angst+Pfister North America Inc. | 10391 Brecksville Rd. | Brecksville, OH 44141 | USA

Phone +1 (440) 375-5212



Topics: Sensor Signal Conditioning, Barometric Pressure Sensors, Ceramic Pressure Sensors, Pressure Sensors, Oxygen Sensors, Mass Flow Sensors, Vacuum Sensors and Transducers

Pressure & Oxygen Sensors in Oxygen Concentrators

Posted by Seta Davidian on Jan 7, 2016 10:51:57 AM

An oxygen concentrator is a medical device to deliver oxygen to a patient. A typical concentrator consists of a compressor, absorption columns with air filters, circuitry, a product tank and regulator. Oxygen concentrators differ from machines delivering compressed oxygen from tanks filled at a separate location. Instead, an oxygen concentrator takes standard room air, filters out the nitrogen and other gases, leaving oxygen to be delivered to the patient.

The block diagram shows a design of a typical oxygen concentrator. Pressure and oxygen sensors are used at various points to ensure proper creation and delivery of oxygen. For example, a pressure sensor is used at the product tank to measure the tank's level and to ensure there is proper flow moving into the regulator.



Often times there is also a pressure sensor between the regulator and outlet oxygen. A stationary oxygen concentrator may use a pressure sensor in the 50 kPa rap-ag-sensors-ad.jpgange to detect a kink in the tubing. (See AP2/AG2 analog pressure sensor or AP3/AG3 pressure sensor with threshold detection). For portable oxygen concentrators, a pressure sensor in the 1 kPa range is used to detect inhalation which then controls the regulator. Here, it is important to use a pressure sensor that is sensitive enough to detect the low flow rate of breathing but can also withstand high overpressures. The AL4 is a good option meeting this requirement.

oxygen-sensor-element-single.pngFinally, and perhaps most obviously, an oxygen sensor can be installed to sense the oxygen percentage of the air being delivered to the patient. The oxygen sensor allows the designer to create alarms and set points for the filtering portion of the concentrator.

The abundance of sensing technology has allows for the development of more flexible medical equipment with more features and functionality. This description of oxygen concentrators is one example of where the evolution of technology has created better health for all.

Get Fujikura Pricing Now




Topics: Pressure Sensors, Oxygen Sensors

Oxygen Sensors - How They Work & Where Are They Used

Posted by Seta Davidian on Dec 10, 2015 2:06:44 PM

Oxygen measurement is critical in a wide range of applications. From ensuring enough oxygen exists for life sustainability and development, to monitoring harmful and dangerous gases, oxygen sensing can be found in medical equipment, HVAC systems, industrial processing, instrumentation, and the new exciting field of additive layer manufacturing with metals and alloys.

oxygen sensorThe oxygen sensors offered by Servoflo are a zirconium-based sensor. The sensing element is heated to more than 350°C which allows oxygen molecules to penetrate the sensing chamber. A voltage is applied to pump the oxygen out of the chamber. The measurement current produced is proportional to the quantity of oxygen molecules pumped away. 

Key advantages of the zirconium-based approach include:

  • Long-term stability with minimal drift
  • The operating lifetime of the sensor is greater than 4 years
  • Temperature operation up to 300°C
  • Ambient pressure has no effect on oxygen measurement, eliminating the need for pressure compensation

Stand-alone oxygen sensors with a raw signal output are available. Users have to take the sensor signal and provide compensation and amplification. Alternatively, Servoflo is offering signal conditioned sensor modules with either an analog or digital signal output, the FXC-MLxx or FCX-MCxx Series.fcx-ml.png

The FXC-ML or FXC-MC has the following features:

  • Can be configured for flow (force air into the sensor) or diffusion operation (sitting open-ended)
  • Configurable for analog output or digital output
  • Sensor head and connecting cable can be configured for 200°C
  • Measurement ranges include 0.1-25% and 0.2-95% O2
  • Accuracy of ±0.5% FS
  • High quality Swiss manufacturing
  • Standard off the shelf modules can be easily customized to meet your specific requirements
0.1 to 25% O2 0.1 to 25% or .2 to 95% O2
24VDC supply 24VDC Supply
4-20 mA output (logarithmic) Linear analog of 0-10V, 0-20 mA, 4-20 mA included. Digital outputs available.
Learn more about FXC-MLxx Learn more about the FCX-MCxx

A wonderful aspect of these products is the ability for customization of many features. Here are some examples of customized versions of the FCX-ML/MC oxygen sensor modules:

CO2 incubators/cell culturing: The customer required I2C only for an output, and a sensor head to withstand 200°C while the cable and sensor head connector needed to withstand 180°C. 

Critical containment and ventilated small animal enclosures: A customer required an RS485 output with DIN41612 for rack mounting.

Additive layer manufacturing with metals and alloys: 3D printing with metals and alloys is a new, growing field. The quality of the finished part is directly proportional to the oxygen concentration (the lower the better, ideally >1%). Special cable terminations were provided to prevent EMC issues.

Additional examples of customization are shown in the image below.

oxygen sensor customization

Should I use the oxygen sensor element only or buy a packaged solution? The answer is, it depends. A packaged solution such as the FCX-ML or MC is great for users who need to find a quick solution to evaluate the oxygen sensor without having to create electronics and circuitry. If a user has in-house expertise to compensate the raw signal, provide the electronics and desired packaging, then purchasing the sensor alone is a viable option. The packaged solution is great for those with limited resources to develop electronics and need help with packaging and design. Here, you can let Servoflo solve your sensor integration issues for you.

Contact Us About Oxygen Sensors

Topics: Oxygen Sensors