HVAC – Sensor Solutions from Siemens

Heating, Ventilation and Air Conditioning (HVAC) in simple terms, is the control of an interior environment, ensuring that the desired temperature is maintained and the air quality isn’t compromised.

HVAC is everywhere, from complex industrial installations, refrigeration plants, hospitals, hotels and apartment complexes to a simple modern home, anywhere where the maintenance of building conditions is required. The 3 major functions of HVAC are, as you may have guessed, interrelated and deal with the maintenance and upkeep of temperature, oxygen replenishment and reducing humidity, smoke, heat, dust, airborne bacteria, carbon dioxide, and other gases and particulates.

Siemens are well known for their impressive range of HVAC control products, including an impressive range of state of the art Temperature Sensors, CO2 Sensors and Thermostats. These devices have all been designed to make life easier for the installation engineer, making set-up, service and replacement a doddle and, of course, the end user and the environment they live in. Below we take a look at 3 of the most popular items in their range.

The QAA2030 Temperature Sensor

HVAC temperature sensorMaintaining a consistent temperature is important for many reasons, such as ensuring an environment is kept at a consistent temperature for employee comfort or a refrigeration installation maintains its sub-zero levels. Temperature maintenance is vital in numerous applications where increases or decreases in temperature may be damaging, such as server racks, food production, calibration industries and laboratories.

The QAA2030 Wall Mounted Room Temperature Sensor from Siemens is a capable contender when it comes to HVAC room temperature monitoring. Using a NTC 10K sensing element, this capable Temperature Sensor changes resistance as the ambient temperature of the room being monitored changes. The Sensor produces a signal which can be interpreted by a suitable control unit that will then initiate a series of operations to maintain the desired temperature. The QAA2030 Room Temperature Sensor has been designed to function with a multitude of controllers that are capable of handling analogue passive sensor signals.

Room Temperature Sensor Features
• NTC 10K Sensing Element
• Measurement range 0 – 50 °C, accuracy ±0.8 K
• Wall mounted
• Time constant 7 min
• IP30 rated housing to EN 60529
• Passive measurement output
• Dimensions 90x100x32 mm

View Siemens HVAC Temperature Sensors Range


The QPA1004 CO2 Sensor

HVAC CO" sensorCO2, being odourless and colourless is one of those gases that can be often overlooked, considered in the past by many scientists to be basically harmless until it reached high atmospheric concentrations. However, research went on to prove that that isn’t necessarily the case, exposure to CO2 concentrations above 1000ppm can have adverse effects on the unaware. Exposure to high CO2 concentrations can impair how you think, cause headaches, dizziness and a lack of focus and impaired cognitive function. High CO2 levels also raise the possibility that a poorly ventilated room may also have high levels of Volatile Organic Compounds (VOC) present as well.

The QPA1004 CO2 Sensor from Siemens is essential when it comes to ensuring that an environment isn’t rich in high concentrations of CO2 thus reducing the risks associated with high levels of this invisible and odourless gas on personnel operating within. A maintenance free sensing element that is based on optical infrared absorption measurement (NDIR), which doesn’t require calibration, constantly monitors an enclosure triggering a system control response should CO2 level become too high. This clever sensor also helps to reduce energy consumption by helping to provide demand-controlled ventilation.

CO2 Sensor Features
• No calibration required
• Measuring range 0-2000ppm
• Optical infrared absorption measurement (NDIR)
• Wall mounted
• Operating voltage 24 Vac or 15-35 VDC
• IP30 rated housing to EN 60529

View the Range of CO2 Sensors


The RDG160T Room Thermostat

HVAC thermometer


Room thermostats are familiar to most people, utilised to help maintain a desirable temperature in homes and businesses around the world. The Thermostat interprets the temperature of a room and either turns a heating unit, such as a boiler within a central heating system on or off. Thermostats help reduce fuel consumption by facilitating on-demand heating, meaning that central heating systems and the components within are only used when required.

The Siemens RDG160T is a feature packed Room Thermostat with an easy to read backlit LCD, simple to use and capable, packed with modern features, this device is ideal for numerous applications in both the home and within business.


Room Thermostat Features
• Infrared remote control receiver
• Auto timer mode with 8 programmable timers
• Heating and cooling modes, comfort, economy and protection settings
• Minimum and maximum setpoint limitations
• Heating or manual heating/cooling changeover
• 3 multifunction inputs for keycard contact, external sensors etc.
• Rated voltage 24 V ac/dc
• 48 Hour reserve clock power during power failure
• Outputs for 1 speed, 3 speed or ECM fan

View the ranges
RD RangeRA Range

Whatever your HVAC requirements are Kempston Controls is the place to come too, as Siemens supplier partners we have access to their entire product portfolio. For all the answers give us a call on +44 (0) 1933 411411 or email our sales team at sales@kempstoncontrols.co.uk and let us help you get the right components for your application.

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Have you seen these articles?

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The temperature of food

Kempston Controls

Kempston Controls is committed to finding you the ideal solution for your application. Call us today on +44 (0) 1933 411 411, email us at sales@kempstoncontrols.co.uk, or alternatively contact us here, we will be happy to help.

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