摘要:
A combination valve includes an isolation shutoff valve to prevent a fluid flow; a check valve to prevent backflow and gravity circulation of fluid flow; a pressure sensor to sense a pressure measurement of fluid flow and determine pressure sensor signaling containing information about a sensed pressure measurement; a temperature sensor to sense a temperature measurement of fluid flow and determine temperature sensor signaling containing information about a sensed temperature measurement; and a flow measurement sensor to sense a flow measurement of fluid flow and determine flow measurement signaling containing information about a sensed flow measurement.
摘要:
In a device and method for taking temperature readings on an HVAC system, a first probe is connectable in thermal communication with the HVAC system for taking a first temperature reading thereof. A second probe is connectable in thermal communication with the HVAC system for taking a second temperature reading thereof that is independent of the first temperature reading. A digital display is connectable to the first and second probes for displaying the first and second temperature readings.
摘要:
In an exemplary embodiment, a temperature sensor and a 4-20mA transmitter on a single flexible circuit subassembly with a separate housing suitable for use in industrial control or HVAC applications. In a preferred embodiment, a narrow flex circuit substrate includes a silicon diode-based surface-mount sensor at a sensor end, a surface-mount programmable transmitter IC on a flex circuit substrate in the transmitter section, conductive traces connecting the sensor to the transmitter IC, and two conductive pads at an output end for connecting the 4-20mA output to a pair of external wires. Additional traces on the flex subassembly are provided for testing and programming the transmitter IC and sensor. The sensor end of the flex subassembly is mounted in a metal sensor tube, filled and sealed in the same manner as RTD or thermistor sensors with leads are currently assembled for use in industrial control or HVAC applications. The sensor tube assembly is attached to a connection head following industry standard practices. A separate plastic housing, compliant with existing industrial control or HVAC industry standards for transmitters, is mounted in the connection head and is configured to hold the transmitter end of the flex circuit. A two position terminal block is used to connect external wires to the 4-20mA output pads. A programmable transmitter is used to calibrate both the sensor and transmitter which are mounted together on the same subassembly. This provides total system accuracy better than +/- 0.3°C over a 200°C span, compared to +/-.8°C accuracy for existing IEC class A RTD- based systems. The programmable transmitter reduces the component cost by eliminating the need for any high precision components in the system. Manufacturing and testing costs are reduced by fabricating, assembling, and testing many flex circuits together on one panel at the same time.
摘要:
In a device and method for taking temperature readings on an HVAC system, a first probe is connectable in thermal communication with the HVAC system for taking a first temperature reading thereof. A second probe is connectable in thermal communication with the HVAC system for taking a second temperature reading thereof that is independent of the first temperature reading. A digital display is connectable to the first and second probes for displaying the first and second temperature readings.
摘要:
An electromagnetic induction heating unit and air conditioning apparatus are provided whereby the responsiveness of temperature detection can be enhanced even when the temperature of the refrigerant tube varies sharply in electromagnetic induction heating. The electromagnetic induction heating unit (6) heats a refrigerant tube (F) whose external surface is composed of SUS tubing (F2), and the electromagnetic induction heating unit (6) is provided with a coil (68) and a fuse (15). The coil (68) is disposed in the vicinity of the refrigerant tube (F). The fuse (15) is in contact with the external surface of the refrigerant tube (F), and the surface of the fuse (15) in contact with the refrigerant tube (F) has substantially the same shape as the contacted portion of the external surface of the refrigerant tube (F).
摘要:
Hourly CO 2 concentration, amount of solar radiation, and plant distribution information are calculated through observation from predetermined satellites. A concentration of CO 2 absorbed by plant-chlorophyll per each time unit is calculated. By adding up the CO 2 concentration on the earth and the concentration of CO 2 absorbed by the plant-chlorophyll, a CO 2 concentration obtained provided that no plant-chlorophyll exist is calculated for a certain period. Thereafter, a mean concentration of CO 2 that is absorbed according to changes in the distribution of plant-chlorophyll is calculated on the basis of a monthly mean solar radiation amount and plant-chlorophyll distribution information. By subtracting the CO 2 concentration, which is a mean, from the total CO 2 concentration, a CO 2 concentration, which is a normal, is calculated.
摘要:
Es werden ein Verfahren und eine Vorrichtung zur Detektion der Kennlinie f (ϑ) eines Messfühlers (2) für zeitlich veränderliche Temperaturmesswerte, die in Heizungs- oder Klimaanlagen oder deren Regelungen verwendet werden, vorgeschlagen, bei denen eine Messwertfolge des Messfühlers (2) und eine Messwertfolge eines Referenzmessfühlers (4) mit bekannter Kennlinie erfasst und die einzelnen Messwerte des Messfühlers (2) in Relation zu den Messwerten des Referenzmessfühlers (4) gesetzt werden. Um auch in nichtstationären Zuständen eine Kennliniendetektion zu ermöglichen wird vorgeschlagen, dass bei einer nichtstationären Messwertfolge ein möglicher Zeitversatz (Δ T R , Rohsignale ,Δ T R,Filt ) zwischen einer Messwertfolge des Messfühlers (2) und einer Messwertfolge des Referenzmessfühler (4) ermittelt und korrigiert wird. ( Fig. 1 )