Heating, Ventilation and Air Conditioning

HVAC systems are often the largest energy consumers in a facility, and HVAC systems haven’t always been designed environmentaly friendly. Current HVAC trends are geared toward lowering the amount of energy used to heat and cool. Engineers and scientists are looking for new and different ways to enhance and better control the HVAC landscape. The Internet of Things and Industry 4.0 continues its growing path and is enabling us to communicate with HVAC systems in new ways while enhancing HVAC efficiency. Thanks to technologies like smart controls and data analysis HVAC systems are beginning to incorporate these capabilities which become more mainstream now.

Take advantage of our know-how to integrate temperature, humidity and flow sensors to build more sustainable and smart HVAC designs. For example, architects are rethinking the way ventilation systems are applied by using more natural airflow to improve efficiency and at the end saving energy. Millennials are willing to pay more for products and services that come from companies with commitments to positive environmental impacts. With the global demand for air conditioning alone expected to triple by 2050, we all need to contribute to optimization and take responsibility.

Smart HVAC systems provide more than just smart and remote temperature control. Imagine your HVAC system alerting you when it needs a repair or routine maintenance check. New sensors in the thermostat, compressor or other parts can regulate how the system runs and tell you only when maintenance is really needed. All technologies aim to run the systems more efficient and at lower costs. However, no matter how smart and efficient a system is and no matter how much functionality and connectivity you plan to incorporate in the new generation of HVAC products, in the end you will always be in a strong need of reliable and stable sensing components. All the smart algorithms are only as good as the raw data provided from the sensor chip in the first place.

Temperature regulation through zoning, which allows different temperatures to be set in different areas of a building, various bedrooms can even have their own temperature settings based on the occupant’s personal preference. These developments not only boost convenience and lower utility bills, but also  have the potential for a global impact on sustainability .

The right sensor for your device

Our mission is to produce well engineered sensors, which provide strong dependable values through profound material science and intelligent calibration along with state-of-the-art manufacturing capabilities and consistent quality. IST AG is today a one-stop shop for temperature, humidity, flow and differential pressure sensors chips and therefore an ideal partner to launch new quality products or potentially redefine an existing HVAC sensor portfolio. 

P14 high quality humidity sensing components

The P14 humidity capacitors are passive humidity components. The sensor chip design and the material choice are the result of continuous development supported by an increased demand of quality products in the HVAC market over the last decades. Years of experience today enable measurements even in combination with dew formation and when applied in different gases including several corrosive atmospheres. It provides great stability and long-lasting measurements, because of its waterproof materials such as the ceramic body and proprietary polymer design. This is the number one choice for HVAC sensing manufacturers intending to integrate the P14 humidity chip capacitor into their own electronics and calibration capabilities. Our P14 humidity sensors are used in high quality air ducts, temperature and humidity transmitters, thermostats.

Check our environmental and chemical test and compatibility data.

HYT calibrated digital humidity and temperature modules

The HYT humidity modules are the result of a development to integrate the high quality P14 humidity sensing components into a digital and fully calibrated temperature and humidity module for high end HVAC applications. A nine-point calibration takes place to assure high accuracy over a wide temperature and humidity band width, while the correct material choice such as alumina ceramics as substrates provides longevity and satisfactory results not only on the data sheet. The sensor component as well as its surrounding materials are engineered to guarantee almost zero moisture absorption and to prevent misreading due to false water/moisture sources.
HYT modules are provided in exposed sensor element versions, as well as two filter cap versions (mechanical protection) for simple integrations in air duct transmitters, compressed air transmitters or wall mount thermostats.

Our three HYT models can be ordered with a tailored calibration, which allows an accuracy of better than +/- 1.4 % rh when used in combination with a limited range of 0-50 % rh. Our humidity modules can be operated at a very high accuracy, when prepared and calibrated for specific environments.

More information about the HYT humidity modules can be found here.

FS7 simplified thermal mass flow sensors

FS7 flow sensors were developed with the idea of a simplified chip integration towards a thermal flow transmitter for HVAC applications.  One single chip with a dual resistor structure was achieved that can work with a basic circuit that enables the measurement of a constant anemometer principle. Highest possible sensitivity is achieved through a direct immersion of the chip into the air flow. A measurement in the typical HVAC air duct flow speed range between 0 m/s to 25 m/s or more is possible.

The main advantage of the FS7 is the high sensitivity especially at lower flow rates 0 m/s to 2 m/s, while performing within a wide dynamic range at the same time. Applied in CTA mode (constant temperature anemometer mode), the FS7 can read from 0…100 m/s flow speeds. 
The FS7 is found in various applications, such as classic air duct flow transmitters or handheld devices to control air conditioning systems, at the tip of a retractable monopod.

Due to its low-cost implementation it is used for filter monitoring in combination with air purifiers. High performance applications are aspiration fire detectors and compressed air mass flow metering transmitters where often a custom chip design or a separated heater and sensor chip are used to increase sensitivity. Take advantage of decades of chip, electronics and design integration experience for HVAC applications at IST.

> Click here for more information on flow sensors 

MFS02 and SFS01 low power mass flow sensor for wireless applications

The motivation to develop MFS02 and SFS01 technology sensor chips was to enable ultra-fast and ultra-sensitive flow measurements and at the same time enable battery powered flow metering devices for HVAC systems. The MFS02 is developed on a compact chip design using a glass substrate while the SFS01 using a silicon substrate. The active chip components are situated on a very thin membrane. This allows to perform flow measurements while taking advantage of a very small thermal mass. The result is a response time of less than 10 ms in the case of MFS02 and less than 5 ms in the case of SFS01, but also provides a low power solution to the typically very power-hungry hot wire anemometers. Especially advantageous if  battery powered wireless HVAC devices are planned to be developed. An ultra-sensitive measurement in differential pressure applications can also be achieved through a noise free resolution down to 5 mPa.

The sensors are integrated in positive pressure ventilation systems (clean rooms, hospitals), filter monitoring, flow/glow box, micro fluidic gas, applications, ​battery supplied devices. 

Check here for various application notes and evaluation kits supporting a fast an easy evaluation and implementation.