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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Vaccine Storage Temperature Monitoring Solutions from Lascar with the EL-WiFI-VACX

The safe storage of medicines and vaccines isn’t something to be taken lightly. Vaccines are biological substances that may lose their effectiveness quickly or even become potentially dangerous if they are allowed to become too hot or too cold at any time, especially during transport and storage. Vaccines are transported and stored according to a recommended temperature range of +2 to +8 °C until the point of administration, they cannot be frozen and also must be protected from light. If the storage recommendations for vaccines are not accurately followed the manufacturers will disclaim any responsibility for any failures.

Monitoring the Temperature
Every year winter rolls in bringing with it an increase in viruses such as flu which can be a life threatening for those with compromised immune systems, so in the run-up to these colder months people are encouraged to get themselves a flu jab. The storage of vaccines, as mentioned earlier, needs to be carefully monitored, what if there was a power failure and your vaccine storage facilities went offline? When was the power cut, how long were the fridges offline? As vaccines can withstand a short exposure to temperatures beyond their predetermined storage level, without knowing the when and the how you risk having to destroy a batch of expensive vaccines.

As an answer to this expensive and also potentially life threatening scenario, Lascar offers a solution for the accurate temperature measurement of refrigerated vaccine storage and transportation facilities in the form of the dependable EL-WiFI-VACX. This premium WiFi enabled device operates as a remote high-accuracy vaccine temperature monitoring device, features include a large LCD, email alert notification via WiFi, built-in alarm warning light and sounder. This clever device keeps you informed, allowing you to take prompt action to protect those vaccines, such as moving them to another location while maintaining accurate data logging of their temperatures during transit.

vaccine storage fridge

The EL-WiFi-VACX allows remote vaccine monitoring and data collection over a WiFi network, viewable from any internet-enabled device via the EasyLog Cloud. With this device you can set-up high and low temperature alarms and receive instant email alerts when the storage temperatures become too hot or cold. The EL-WiFi-VACX stores data internally and if it loses WiFi connection it will automatically upload it to the Cloud once reconnected.

Trustworthy Design
A Glycol-filled temperature probe comes with the EL-WiFi-VACX which has been created to match the temperature response of vaccines in storage, ensuring highly accurate and representative readings. The probe is replaceable, which can be calibrated separately if required, a traceable calibration certificate and a wall mounting bracket are also included. This precision instrument meets and exceeds the CDC standards for vaccine monitoring.

• Measurement range -40 to +60°C (-40 to 140°F)
• Measurement resolution 0.01°C (0.02°F)
• Display resolution 0.01
• Measurement accuracy (typical) ±0.1°C (-10 to +60°C) ±0.2°F (+14 to +140°F)
• Measurement accuracy (maximum) ±0.6°C (-40 to +60°C) ±1.1°F (-40 to +140°F)
• Operating temperature (unit) -20 to +60°C (-4 to +140°F)
• Readings – unlimited
• Logging rate – user selectable between 10 seconds and 12 hours
• Battery Life >6 months can be powered by USB
• IP rating – data logger IP42, Probe IP67


If you are looking for a trustworthy temperature monitoring solution for your vaccine storage needs that will keep you informed should the worst happen then look no further than the Lascar EL-WiFi-VACX, which is readily available from Kempston Controls. As Lascar supplier partners we have access to their entire product portfolio, contact us on +44 (0) 1933 411411 or email sales@kempstoncontrols.co.uk for all your Lascar product needs.

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Food Storage Temperature Monitoring the Easy Way with the Lascar EL-WiFi-TPX+

Monitoring environmental temperatures can be vitally important for many businesses, particularly those which deal with food storage, with all those businesses needing to comply with HACCP food safety regulations. Monitoring and relying on the manual recording of fridge and freezer temperature changes, which can be effective to a point, does however also allow for an element of human error to enter the equation. Temperature changes could be entered incorrectly and even forgotten to be recorded at all, which isn’t the ideal solution when it comes to storing food safely and avoiding the possibility of making someone ill and facing litigation. For a temperature monitoring methodology you can trust you are going to need the Lascar EL-WiFI-TPX +.

Lascar EL-WiFI-TPX + Wireless Temperature Monitoring and Recording Made Easy
Installing these clever wall-mountable wireless enabled sensors in all food related storage areas allows for the reliable monitoring and capture of temperature data points which can be downloaded via a WiFi network to the Lascar EasyLog Cloud . Not only that, the EL-WiFi-TPX+ also provides a visual and audio alarm facility should some issue with the temperature of your storage facility occur. This capable device features a high-resolution LCD for quick temperature reading and comes with a thermistor temperature probe which is placed in the area being monitored, such as a freezer or fridge. The EL-WiFi-TPX + stores data internally and if it loses WiFi connection it will automatically upload its stored data to the EasyLog Cloud once reconnected.

The easy to use Lascar EasyLog Cloud allows access to each data logger and data collected from any internet-enabled device. You can change data logger settings remotely, receive email alerts of alarm conditions, link sensors from multiple sites into one account and assign multiple user privileges.

food storage freezers

Consistency is Key
The EL-WiFi-TPX+ has been designed to remotely monitor an environment over a -40 to +125°C (-40 to +257°F) measurement range. The built-in alarm warning light and sounder make sure you never miss a temperature breach and the accurately gathered data is uploaded periodically using a standard WiFi network to the EasyLog Cloud.

The high-accuracy thermistor temperature probe, which can be removed and calibrated separately if required and a wall mounting bracket are included with the EL-WiFi-TPX+.

EL-WiFi-TPX + Specifications
• Measurement range -40 to 125 °C (-40 to +257 °F)
• Measurement resolution 0.01 °C
• Display resolution 0.01
• Measurement accuracy ±0.2°C (-15 to +80°C) ±0.6°C (-40 to 125°C)
• Unlimited readings
• Logging range user selectable between 10 seconds and 12 hours
• Battery Life >6 months can be powered by USB

If you are looking for a trustworthy and reliable temperature monitoring solution for your food storage needs then look no further than the Lascar El-WiFi-TPX+ which is readily available from Kempston Controls. As supplier partners we have access to the entire Lascar product portfolio, contact us on +44 (0) 1933 411411 or email sales@kempstoncontrols.co.uk for all your Lascar product needs.

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The Photoelectric Diffuse Laser Sensor that Sees Everything!

The detection of transparent, highly reflective, shiny and dark objects has always been an issue for infrared and vision-based process control sensor. The sensors would suffer instability during detection and fail to detect properly, which isn’t what you what in an industrial processing and automation installation. To address this problem, the ever-innovative development engineers at SensoPart put on their thinking caps.

photoelectric diffuse laser sensor on bright metal

The Sensing Solution

The FT 55-RLHM Photoelectric Diffuse Laser Sensor with background suppression (BGS) was created to effectively and reliably detect target product surfaces of any kind and identify even the smallest objects with ease. This unique sensor features an operating mode known as ‘Detect all’ and it can cope with any type of targets including:

  • Shiny and reflective target objects
  • Transparent products
  • Black products on a black background

The FT 55-RLHM range can respond to all deviations from a given reference, including changes in an objects distance, differing surface finishes or even a deflected laser light beam, the most efficient sensor in this category.  In this mode, this impressive and versatile sensor has no blind zone and target objects can be detected from zero mm. Ideal for countless challenging detection applications such as automotive, metal processing, machine construction and packaging technology.

Small targets? No problem…

Small targets can be reliably and easily identified within the sensors defined detection range including objects at acute angles. This capable Diffuse Laser Photoelectric Sensor not only utilises the distance value but can also cleverly integrates the energy emitted from the target object itself during the detection process. This sensor can be used to check stack height such as identifying multiple product layers like stacks of cardboard packaging by detecting the presence of too many or too few layers.

photoelectric diffuse laser sensor in action

Detecting black on black products and welded nuts


Impressive Features

  • Detection of the smallest objects even at long distances (up to 1 m – model dependant)
  • Extremely stable presence detection even in challenging applications
  • No blind zone in ‘Detect all’ mode
  • Special mode for stacking height measurement
  • Easy to operate thanks to LCD display and feedback function
  • Two independent switching outputs
  • Configurable switching outputs -switch-on/switch-off delays and more
  • Fast set-up thanks to continuous distance indicator in display
  • Laser class 1 – for optimum security
  • IO-Link – a future-proof interface that meets the demands of Industry 4.0
  • Robust metal housing – sensor durability even in challenging processes

Download the DataSheet

This comprehensive range of functions combined with a high-quality metal housing and non-hazardous laser class 1, makes the  FT 55-RLHM range ideal for diverse industrial automation applications, whether in machine construction or in the automotive, plastic, pharmaceutical or packaging industry.

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Kempston Controls are the people to talk to if you are looking for a SensoPart Photoelectric Sensor Solution. With access to SensoPart’s entire product portfolio we can get you the products you need, when you need them and at the best possible price. Give our hard-working sales team a call on +44 (0) 1933 411411 or email sales@kempstoncontrols.co.uk to discuss your Photoelectric Sensor requirements.


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Siemens HVAC Products, Tailor-Made Control

Kempston Controls is delighted to be able to offer a comprehensive range of Siemens HVAC products that encompass an extensive line-up of Field Installable Devices including Globe Valves, PICVs (Pressure Independent Combi Valves), Control Ball Valves, Magnetic Valves, Rotary Valves, Damper Actuators, Variable Speed Drives and Sensors. Easy to install and reliable, with long life and backwards compatibility these products have been used in millions of successful HVAC installations around the world.

Siemens HVAC round up

Globe Valves – perfect for adjusting flow rate, mixing and shutting off the fluid supply. These reliable, easy to install units can be used for a wide range of tasks in a host of HVAC applications.

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Energy-efficient PICVs (Pressure Independent Combi Valves)– the ideal device for regulating volumetric flow complete with differential pressure control for shielding pressure fluctuations. Records pressure measuring points for differential pressure measuring in one valve body.

View the ranges below:

Electromotive Valves

Electrohydraulic Valves

Control Ball Valves –  2, 3 or 6 port valves, 100% air bubble-tight energy-efficient ball valves with minimum friction loss. These Control Ball Valves can be fitted with an internal or external thread and are excellent for strict media control with high precision.

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Magnetic Valves – with preinstalled magnetic actuator, threaded or flange fitment. Rapid opening and closing, these valves are ideal for HVAC applications that call for the control of water, antifreeze and water, heat transfer fluid, steam. High-precision and very efficient.

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Rotary Valves – the perfect solution for shut-off and mixing in energy generation and distribution applications such as multiple boilers, heating and cooling changeover, shut-off and variable temperature circuit control.

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Siemens HVAC actuators

Damper Actuators  OpenAir Series – a capable and wide range of easy to mount dampers, including Rotary and Linear, VAV controllers, Fire and Smoke Actuators and more, suitable for a huge variety of applications. All tailored to meet your requirements with a long service life and improved energy efficiency.

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Variable Speed Drives –  high-end drives offered in a range of outputs from 0.75 to 90 kW. The drives modular design simplifies the replacement of single components ultimately reducing expenditure. With numerous digital and analogue outputs, no requirement for main chokes, advanced communication protocols and reduced circuit feedback you can’t go wrong.

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Thermostats – this impressive portfolio ranges from simple mechanical and digital room thermostats for basic climate control to advanced KNX communicating thermostats for integrating into building climate automation systems. Cost-effective, power saving and with Smart options the best in climate control got better.

View the ranges:

RA Series

RD Series

HVAC Sensors – whatever the application, Siemens will have a sensor. Temperature, humidity, air quality for monitoring rooms, ducting, air velocity, pressure/flow rate sensors and advanced certified sensors for monitoring fluids and gases. For the perfect sensory solution in the office and in demanding industries, they have the answer.

View the ranges

Temperature Sensors

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Siemens HVAC sensors

The Siemens HVAC product range also includes a comprehensive offering of Building Automation/Control and Standard System Controllers, so whatever your application demands from Damper Actuators and Globe Valves to Variable Speed Drives, Kempston Controls can help. The impressive portfolio of Siemens HVAC products can be individually tailored to your requirements, get in touch on +44 (0) 1933 411411 or email us at sales@kempstoncontrols.co.uk to discuss your requirements.

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Creating an Oxygen Monitoring Device in Record Time

In March 2020 the team at Oxford Optronix, a global pioneer in the design, development and manufacture of sophisticated instrumentation for life sciences were faced with a challenge. At the peak of the Covid-19 pandemic they were asked to join a high-tech consortium to supply continuous Positive Airway Pressure (cPAP) oxygen monitoring medical devices to the National Health Service.

Monitoring Oxygen

Desperately needed for Covid patients with breathing difficulties, an oxygen monitoring device continuously monitors the concentration of oxygen delivered to the patient, providing alarms should the oxygen levels deviate from prescribed limits.

Dr Andy Obeid, CEO of Oxford Optronix said – ‘On 21st March, I received an urgent call from Professor Mervyn Singer of University College London Hospital explaining to me the vital importance of cPAP in supporting COVID-19 patients with breathing difficulties, especially in those cases where conventional ventilation isn’t justified or potentially injurious to the patient. Minutes later, I was being quizzed on how to design, develop and manufacture a monitor to continuously measure the concentration of oxygen being delivered to the patient via cPAP. I soon realised that Mervyn was rather politely asking me to do something in five days that would normally take two years!’

Time was of the essence just how do you design and build a brand-new medical device from scratch in just five days?

optronix flo-ox oxygen monitor2 Years Work in 5 Days

It was decided that a Touchscreen Display interface was need to display the patients current oxygen levels and allow medical staff to set the upper and lower limits. Typically this would involve sourcing hardware and writing code to drive and generate the display whilst integrating it with the oxygen sensor and other electronics. Each of these stages could potentially take months to complete.

As luck would have it Oxford Optronix was already familiar with Lascar’s PanelPilotACE, a unique integrated touchscreen which had the built-in processing power needed for the oxygen monitor. More importantly, Lascar’s free-to –download Design Studio software meant no one had to design any code. Design Studio has a built-in library of ready-made graphical and functional elements you can drag and drop and easily combine with system inputs and outputs.

The basic interface for the oxygen monitor was ready in just a few hours, with no electronic integration required the 4 to 20 mA output from the oxygen sensor could be plugged straight into the PanelPilotACE.

Stephen Douglas, Technical Director at Oxford Optronix said – ‘I knew we needed something that would enable us to design and build a touchscreen interface with process control in under a week. PanelPilotACE was that product.’

Technical Expertise

Lascar was more than happy to provide technical support to the development team and working collaboratively the first prototype oxygen monitoring devices, called Flo-Ox, were being tested only a week after the initial phone call. Other parts of the cPAP device were being manufactured by the Mercedes Formula 1 team and combined with the technical and medical expertise at University College London (UCL) the system was quickly approved for patient use.

oxygen monitoring devices fully assembled

Working frantically around the clock and mobilising every individual in the company Oxford Optronix were able to manufacture and deliver 2,000 Flo-Ox monitors to the NHS in just 8 days, an amazing achievement!

At Kempston Controls, we were amazed at the rapid results achieved by Oxford Optronix and the other members of the high-tech consortium whose creation helps to save people’s lives, well done to you all! The Lascar PanelPilotACE range has proven itself in numerous applications around the world, and this latest triumph only goes to show how versatile this product range can be. As supplier partners for Lascar we can help you find the perfect products for your specific installation, give us a call on +44 (0) 1933 411411 or email sales@kempstoncontrols.co.uk to discuss your requirements.

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