Wired or wireless thermostats.

The BASstat BACnet-compliant¹ wired or wireless communicating thermostats provide turnkey integration into BACnet/IP (Wi-Fi) or BACnet MS/TP (EIA-485) networks.

The BASstat has four configurable temperature setpoints: Occupied Heat, Occupied Cool, Unoccupied Heat, and Unoccupied Cool. Only the currently active setpoint is displayed on the BASstat LCD panel during normal operation. This active setpoint can be adjusted directly by pressing the UP/DOWN buttons on the control panel.

However, the inactive Occupied Heat or Occupied Cool setpoint cannot be adjusted from the BASstat control panel. The inactive Occupied mode must be activated using the MODE button, then it can be adjusted using the UP/DOWN buttons on the control panel. For example, if the BASstat is in Occupied Heating mode, the Occupied Heating temperature setpoint can be adjusted on the control panel; but the Occupied Cooling mode cannot be viewed or set until the BASstat operating MODE is changed over to Occupied Cooling.

The Unoccupied Cooling setpoint (ESIC) and Unoccupied Heating setpoint (ESIH) can be read and adjusted at the control panel via the Engineering Menu at any time. All setpoints can also be set directly from the BACnet supervisor controller or from the BACnet Discovery Tool (BDT) to the BASstat at any time it is reachable on the network, irrespective of the operating mode.

The BASstat's internal temperature measuring thermistor maintains an accuracy of +/- 1.8°F (+/- 1.0°C). If any temperature offset adjustments are necessary, it is best practice to wait at least 30 minutes after powering up the BASstat before making any adjustments from either BACnet point AV15 or the OFSt command from the Engineering Menu.

In order for the BASstat to accept remote BACnet temperature and setpoint data input from a Building Management System (BMS), the BASstat must receive a timed pulse (heartbeat) from the BMS supervisor "head-end" during an established time interval. This minimum interval (Heartbeat Rate) is set at BACnet point AV29. This pulse (a data "1") needs to be received at BACnet point BV16 during this interval for the BASstat to maintain communication of the head-end's control output data (occupancy, setpoints, temperature data, etc.) If a new heartbeat pulse is not received before the last one times out, the BASstat will assume that the head-end supervisor is offline and use only locally measured data. This AV29 interval can be set to any rate between 10 to 3600 seconds (default setting is 10s). It is best practice to have the head-end send out this pulse to BV16 at a rate 2x-3x the AV29 interval. For example, if the AV29 interval is set to 240 seconds, it would be a good idea to send out the BV16 pulse between 90-120 seconds. This can compensate for possible delayed or missed network communication. This is especially important when working with BACnet/IP over Wi-Fi.

---

¹ About BACnet (Building Automation and Control Network).

#Contemporary Controls  #BAC #HVAC

Enclosure heaters on display.

STEGO Elektrotechnik will be presenting its enclosure heater with a novel loop design at this year's SPS in Nuremberg (D).* STEGO's showcase for the return of the SPS trade fair also features an update to the KTO/KTS control cabinet thermostats and new smart sensors.

LTS064 loop-heater touch-safe

Their LPS and LTS product series give an update to its PTC-based convection heaters with capacities of between 10 and 150 W. The cooler bodies in the new loop profile design absorb the heating capacity of the PTC elements better and ensure a higher stability of the device against vibration. This means the LTS series of heaters is able to comply with the standards for mobile railway applications (DIN EN 60068-2-27:2010-02 and DIN EN 60068-2:64:2009-04). STEGO consistently uses push-in terminals for electrical contacts in the LPS and LTS series. Easily accessible on the front of the devices, the push-in terminals provide time savings of up to 50% by allowing for tool-free insertion of the cables. The terminals exert constant pressure on the supply lines, which provides added security even when transporting pre-assembled control cabinets, for example. You therefore do not need to worry about the connecting cables coming loose and resulting short circuits.

New editions of their KTO/KTS fine-tune STEGO's mechanical thermostats to better meet the needs of control cabinet construction in practice. The thermostats are designed as two-point regulators with a thermobimetal sensor element. The KTO 111 is a contact breaker (NC) for controlling heaters. The KTS 111 is a contact maker (NO) for controlling filter fans, heat exchangers, coolers and switching signal devices. Push-in terminals are used for making electrical contact. They ensure that connecting the power cables is safe, tool-free and fast. Users can expect a reduction in installation time of up to 50%. STEGO engineers have also optimized the housing design so that the thermostat now literally has more air. Larger air vents in the main unit, which tapers towards the back,

The newly developed DSS 015 Distance Smart Sensor (right) measures the distance of objects using the time of flight (ToF) of ultrasound waves. The DSS 015 Distance Smart Sensor is designed for monitoring distances or fill levels in industrial applications. The DSS 015 can even detect transparent objects such as glass, films and fluids. It is also unaffected by changing light conditions, and easy to connect to higher-level control systems (eg SPS) via its IO-Link interface.

STEGO is expanding its range of sensors for industrial applications that use IO-Link. Their SHC 071 Sensor Hub offers a cost-effective interface through which STEGO sensors can easily be connected to IO-Link installations. The SHC 071 Sensor Hub records measuring data on the process level from up to four external, non-IO-Link-capable STEGO sensors and transmits the data via the IO-Link Master to higher-level control units such as Edge computers, the cloud , SPS control etc. The Sensor Hub can be used to connect up to four external STEGO sensors while using only one port on the IO-Link Master, saving the IO-Link Master's connection capacity. The number of connected sensors and the allocation of sockets can be freely chosen by the user. Sensors from the SEN 073 series are available for the Sensor Hub. The sensors are pre-calibrated and are easy to connect to the Sensor Hub using a plug. Clustering IO-Link functionality in the Sensor Hub allows the sensors to take on a compact form factor. Sensors in the SEN 073 series can be used to record data in the following fields of application: temperature and relative humidity, temperature and absolute air pressure, visible light, illuminance and VOC.

*SPS - Nürnberg (D) November 8th-10th 2022

@stego_de @spsmesse @PresseBox #PAuto

Bimetal Thermostats.

Small compact thermostats KTO 111 and KTS 111 from STEGO feature a practical innovation: Push-In terminals ensure faster and tool-free connection. The small-sized regulators can be quickly connected within an enclosure or control cabinet to switch heating and cooling systems. These provide a constant climate, prevent the formation of harmful condensation, and enable trouble-free operation of sensitive electronics.

Push-In terminals for faster connection
With the new KTO / KTS thermostats, STEGO has taken the opportunity to adapt its regulators to meet the requirements of the enclosure manufacturing industry. KTO 111 and KTS 111 connect to the power supply tool-free using Push-In terminals on the front of the housing. The terminals provide constant pressure on the connection wires ensuring safety even during transportation of preassembled enclosures. It prevents wires from becoming loosened. Another advantage of the Push-In terminals is a 2/3rd reduction of installation time due to tool-free wiring.

NC and NO Contacts for optimal climate
The mechanical thermostat may appear to be small and possibly unspectacular, however only at a first glance! Thermostats are important components in every enclosure. They regulate the climatization of electronic components within the desired temperature range and thus help protect against harmful condensation. The two new thermostats are designed as two-state regulators with a sensor element made of thermostatic bimetal. The flexible bimetal bends under the influence of temperature and switches a snap-action contact. The KTO 111 is a contact breaker (NC – normally closed - the contact opens when the temperature is rising) for regulating heaters. The KTS 111 is a contact maker (NO – normally open, the contact closes when the temperature is rising) for regulating filter fans, heat exchangers, cooling appliances, or switching signal devices. So, what is the advantage of using a thermostat duo over a thermostat with change-over contact? The combination of two single thermostats (NC and NO) is more economical and allows the user to individually set the temperature ranges for heating and cooling. On the other hand, the change-over contact provides a specific changing point between heating and cooling and is a good choice when space is at a premium.

More air to “breath”
The company has put a lot of effort into the re-design of the thermostat housing. Now the thermostat has “more air to breath”. Enlarged air gaps on the rear of the thermostat housing ensure an optimized air intake and thus improved response time to temperature changes. Noticeable is also the curved, ergonomic housing design on the front with a large setting dial, which is easier to read and increases safety against unintentional adjustments: the temperature setting can only be changed with a screwdriver. STEGO´s Head of Development Peter Witsch points out the company’s special relationship to the enclosure and cabinet thermostat: “Our company co-founder and former Head of Development Hartmut Eisenhauer developed the bimetal thermostat for enclosures and control cabinets around 30 years ago. Since then, this product invention has become an established industry product. Therefore, we are committed to further extend the product benefits for customers with each re-design.”

Tried and tested in harsh environments
The operating temperature of the thermostats ranges from -45 to +80 °C (-49 to + 176 °F) in an environment with a maximum of 90 % relative humidity (non-condensing). KTO / KTS are developed for protection type IP20 and protection class 2, achieve a verified service life of 100,000 cycles, and are suitable for the following switching currents: AC 250 V, AC 120 V, and DC 24 to 72 V. The maximum inrush current is AC 16 A for 10 seconds. The switch temperature difference is 7 K with a tolerance of ±4 K. They are mounted by the clip for a DIN rail. A special feature of the new thermostats is their suitability for use in high altitudes. The thermostats can be used up to 5,000 meters (in overvoltage category II) and up to 2,000 meters (in overvoltage category III), thanks to the optimized air gap and increased creepage distance. The thermostats KTO 111 and KTS 111 have standard agency approvals, such as safety approvals by UL and VDE.

@stego_de @PresseBox #PAuto 

WiFi thermostat.

The popular BASstat BACnet-Compliant Thermostat  is now available with WiFi.

The BACnet/IP Wi-Fi thermostat has a B-ASC device profile for effortless integration into BACnet/IP networks using a Wi-Fi connection. The thermostat is suitable for single or multi-stage heating, cooling, and ventilation binary control applications such as RTU or AHU. Configurable control algorithm parameters allow adaptability to your specific application. Multi-stage on/off control saves energy and ensures seamless comfort for the occupants.

BACnet/IP Wi-Fi communication requires connecting the thermostat as an access point for initial configuration. A Wi-Fi enabled laptop/computer or smart portable device can discover the BASstat initially as a Wi-Fi access point with a Service Set identifier (SSID) of "WiFi-122B-xxxx" and no passphrase. Simply click to connect to the BASstat. The digits "xxxx" are the last 4 digits of the thermostat's MAC address and can be found on the label on the back of the thermostat's Wi-Fi chip. This allows multiple units to be connected to the same Wi-Fi network. Once connected to the thermostat, open its web page for network configuration. The local Wi-Fi network parameters can be entered and stored, and a unique Device Instance number can be assigned to the BASstat to distinguish it from all other BACnet devices on the network. Thanks to its EEPROM, the BASstat will store all information in a non-volatile memory that is safe from power loss.

User-side comfort control is accomplished with six clearly labeled pushbuttons, which can be selectively locked to prevent unauthorized configuration activity. A large and easy to read backlit LCD display incorporates graphical icons to provide visual indication of the BASstat operation. In addition to the current temperature (selectable between °F and °C), icons indicate the current state of operation and can be a useful tool for both occupants and supervisory personnel.

#CControls #BAS