HVAC transmitters and sensor controllers

Temperature and relative humidity transmitters are available in different enclosures. They measure temperature and relative humidity. Temperature and relative humidity have a direct impact on the sense of well-being and comfort of the residents. Dry air leads to dry skin, itchy eyes, and irritated nasal passages. Too high relative humidity degrees will result in condensation forming on windows, walls and ceilings that are colder than the air temperature and potentially damaging building materials and causing odours in poorly ventilated spaces. Since temperature and relative humidity are the basic parameters determining the comfort and well-being of residents, most Sentera sensors can measure or control these.

CO2 transmitters are available in different enclosures. These NDIR CO2 sensors measure temperature, relative humidity and CO2. Carbon dioxide or CO2 is a result of human metabolism. Moderate to high levels of CO2 can cause headaches and fatigue. To prevent or reduce high concentrations of carbon dioxide in a building or room, fresh air should be supplied to the room. NDIR is an industry term for “nondispersive infrared”, and is the most common and adequate type of sensor used to measure CO2.

Air quality transmitters are available in different enclosures. These TVOC sensors measure temperature, relative humidity and TVOC concentration. VOC or Volatile Organic Compounds evaporate from substances such as cleaning products, adhesives, paints, new carpets, copiers and printers to building materials and furnishings. VOCs are also emitted from humans and animals in their breath, sweat and directly from their skin. VOCs are known to cause eye, nose and throat irritations, headache, drowsiness, dizziness, nausea, difficulty concentrating and fatigue. Therefore, it is important to monitor the VOC levels and to extract the contaminated air from the area. TVOC is the sum of the different VOCs and is a good indicator of indoor air quality or IAQ.

These sensors measure toxic gases in buildings or parking garages. LPG, CO and NO2 transmitters are available in different enclosures. They measure temperature, relative humidity, CO and LPG or NO2 concentration. Combustion processes - for example cars moving around in an enclosed parking garage - release toxic gases like nitrogen dioxide (NO2) and carbon monoxide (CO). In order to maintain an adequate health and comfort level, the concentration of these toxic gases must be monitored so that fresh air can be supplied in time.

Monitor differential pressure over the air filter. When the air filter gets polluted, the differential pressure increases. When the threshold value is exceeded, a notification is sent. This filter monitoring unit is the ideal tool to optimize the maintenance of your ventilation system.

Differential pressure switches detect overpressure, vacuum or differential pressure. The switching pressure setpoint can be adjusted by means of a scaled calibrated knob. A typical application is to detect a clogged air filter or to generate an alert if the air flow drops below a critical level.

These pressure transmitters measure differential pressure, air volume flow or air velocity. A typical application is to monitor differential pressure over an air filter and generate an alert in case the filter gets polluted. Another typical application is to monitor volume flow and guarantee the supply of fresh air. The measured value is transmitted via an analogue output and via a Modbus RTU register. All settings can be adjusted via Modbus RTU.

These HVAC controllers control differential pressure or air volume flow. Air velocity control is also possible in combination with a pitot tube. HPSP, DPSP and SPS2 series control EC fans or AC fan speed controllers. HPSA and DPSA series control damper actuators. Typically these products are used to guarantee a constant volume flow under fluctuating demands or to maintain a difference in air pressure between two rooms. All parameters can be adjusted via Modbus RTU.

Accessories for professional installation of differential pressure transmitters and controllers: transparent PVC tubes, differential pressure connection sets and pitot tubes to measure or control differential pressure, volume flow or air velocity.

Temperature transmitters are available in different enclosures. They measure temperature, ambient temperature, air temperature in ducts or temperature of fluid pipes.