35 results about "Relative humidity measurement" patented technology

A dehumidifier system is connected to an interior space of a building through supply and return ducts, either directly and/or through an HVAC system. Controllable dampers can be used to select how the dehumidifier system is connected to the interior space and the HVAC system. The dehumidifier determines the dew point of the ambient air from temperature and relative humidity measurements taken at location(s) of relative humidity and temperature sensors. Based on the determined dew point, the dehumidifier system determines whether to operate. The temperature and relative humidity sensors can be located in the interior space or within the dehumidifier, where they project into the air stream flowing through the dehumidifier. The dehumidifier system operates in response in part to blower calls to the HVAC system and controls the HVAC system and a ventilation system to distribute the dehumidified air and outside air throughout the building.

A method for measuring and controlling dew point temperature of integrated air-conditioning includes obtaining dew point temperature measurement value corresponding to temperature and relative humidity measurement value of control object point as well as dew point temperature setting value corresponding to temperature and relative humidity setting value, comparing obtained dew point temperature measurement value with obtained setting value, using proportional integration and differential algorithm to control aperture of valve in separating range for making said measurement value be gradually tended to said setting value.

A climate controller (1), comprises a control unit (7) capable of activating and de-activating an HVAC unit (13), a temperature sensor (3) and a humidity sensor (5) capable of communicating temperature and relative humidity measurements to the control unit (7), and an interface (9) to a network (10) through which the control unit (7) is connected to a networked server (14) and transmits measurements of temperature and relative humidity; said activation and de-activation can be controlled by the control unit (7) which measures a temperature and humidity level, obtains a value for a temperature setting and mode of operation for the HVAC unit (13), and communicates a signal to the HVAC unit (13) to effect said activation and de-activation. Climate control is affected with a comfort level in preference to an absolute temperature, and energy efficiency is achieved by machine learning methods operated on data sets gathered by the climate controller (1).

The invention discloses an on-line remote monitoring method and an on-line remote monitoring device for the pollution state of a disk insulator. Pollution degree is quantitatively, conveniently and clearly displayed on line by a relative conductance method for the pollution state, so the mid-range forecast of the insulator pollution is realized, and the method and the method can also be applied to monitoring of pollution states of all external insulation of electric transmission and transformation equipment; the defect that solar energy is used as energy is avoided by taking distributed capacitance current and polluted leakage current of a transmission line as energy; the capacitance current and the polluted leakage current or the sum of the capacitance current and the polluted leakage current of a low potential end can be measured respectively; and whether the insulator is connected in series with a zero-resistance insulator or a line is electrified or grounded is judged according to the change of the capacitance current. An outdoor monitoring device is connected in series with the low potential end of the insulator by using a hanger, so measurement points of temperature and relative humidity are arranged in air current which is connected in series with the insulator, and the measurement points of temperature and relative humidity are protected by a sun shade, so the good correlation of the polluted leakage current with measure data of the temperature and relative humidity can be kept, and the implementation of the relative conductance method for the pollution state can be guaranteed on hardware.

A moisture meter (1) has a hand-held casing (2) with a digital microcontroller (50), LCD display (4), and a keypad (3). Spring-loaded contacts (6) contact material and allow capacitive impedance measurement via electrodes (5) and drive/pickup circuits (20). Also, a relative humidity probe (9) provides an input so that the processor generates both moisture contact near-surface measurements and also relative humidity measurements. This allows optimum analysis of material.

The invention discloses a resistive humidity sensitive element capable of measuring the humidity in a low-humidity environment and a manufacturing method thereof. It uses ceramics as a substrate on which there are multiple pairs of interdigitated gold electrodes. On the surface of the ceramic substrate and interdigitated gold electrodes Coated with a moisture-sensitive film, the moisture-sensitive film is a cross-linked (trihydroxysilylpropyl) n-butylammonium bromide and graphene composite moisture-sensitive material. The humidity sensor is simple to prepare and has good stability, and can realize the measurement of relative humidity in almost all humidity ranges, especially it has a low resistance in a dry environment with a relative humidity lower than 10%, and can be sensitively measured Low humidity environment humidity. The element has the advantages of high response sensitivity, good response linearity, small hysteresis, rapid response, good response reproducibility, etc. It can be widely used in industrial and agricultural production, storage, atmospheric environment monitoring and other fields for environmental humidity, especially drying Accurate measurement and control of ambient humidity.

The embodiment of the invention provides an absolute-humidity detection device and method for a cooking utensil and the cooking utensil, and belongs to the field of home appliances. The device comprises a circuit board, a relative-humidity measuring device, a temperature measuring device and a controller, wherein the circuit board is installed to the side wall of an air discharging chamber of thecooking utensil, and a bottom layer of the circuit board faces the side wall; the relative-humidity measuring device comprises a humidity sensor and a capacitance detection module, and the capacitancedetection module is used for detecting the capacitance of the humidity sensor and outputting capacitance detection signals; the temperature measuring device is arranged on a bottom layer of the circuit board and used for detecting the temperature of steam at the air discharging chamber and outputting temperature detection signals; the controller is used for determining the relative humidity of steam at the air discharging chamber according to the capacitance detection signals, determining the temperature of the steam at the air discharging chamber according to the temperature detection signals and determining the absolute humidity of the steam at the air discharging chamber according to the relative humidity and the temperature. By means of the absolute-humidity detection device and method for the cooking utensil and the cooking utensil, the absolute humidity can be simply and accurately determined.

A corrugated fiberboard comprising cellulosic fibers, wherein said corrugated fiberboard has at least one of a geometrical tensile index in the range of from 32 to 65 Nm/g, a fracture toughness indexin the range of from 4 to 24 Jm/kg, and a ring crush index in the range of from 5 to 10 Nm/g5 measured at relative humidity of 85% RH; wherein the cellulosic fibers comprises a mixture of less refinedfibers having a Schopper-Riegler (SR) value in the range of 15 to 28 and microfibrillated cellulose fibers, wherein mixture comprises said microfibrillated cellulose in a range of from 1% to 5% by weight of the dry content of the cellulosic fibers.

Disclosed are standing-wood electric energy and an environment parameter measuring device for standing wood. The device includes a remote data acquisition device, electric-potential-difference acquisition circuits and a soil temperature and humidity sensor. The device is capable of measuring an electric-potential difference between the standing wood and the ground, air temperature and humidity, soil temperature and humidity and light intensity and sending the data to a remote server through a GPRS network. Hardware of the remote data acquisition device includes a single-chip microcomputer module, a sensor and an interface module of the sensor, a wireless communication module and a power module. The single-chip microcomputer module controls other modules to work normally as a control unit of the remote data acquisition device; the sensor and the interface module of the sensor provide an electric-potential difference measurement circuit, an air-temperature measurement circuit, an air relative-humidity measurement circuit, a soil temperature and humidity measurement circuit and an environment light-intensity measurement circuit so that data are acquired and transmitted to the single-chip microcomputer module. The wireless communication module is capable of transmitting the data to the remote server through the GPRS network under the control of the single-chip microcomputer. The power module supplies power to the other modules.

The invention relates to a device for measuring early-age relative humidity of a cement-based material. In order to measure the early-age relative humidity of the cement-based material, a brand new design structure is adopted, the early-age internal high temperature of the cement-based material and damage of high humidity on a sensor probe can be effectively avoided, and an early-age relative humidity curve of the cement-based material can be accurately obtained. The invention also relates to a method for measuring the early-age relative humidity of the cement-based material. Aiming at previous data, a spot measurement method is adopted, the condition that the sensor probe is damaged by the continuous saturated relative humidity and the high temperature can be avoided, and when the humidity of the cement-based material is lower than 100 percent, the humidity is automatically collected by a computer, a high-precision humidity curve can be obtained, and the sensor can be prevented from being damaged.

The invention discloses a portable measurement instrument for micro water in oil, belonging to the technical field of transformer monitoring and relating to a device for monitoring the moisture change in transformer oil. The portable measurement instrument for micro water in oil comprises a sensor for micro water in oil, two probes, a ball valve, two analog outputs and a serial output, wherein the sensor for micro water in oil is a high molecular thin-film humidity sensor and provided with a stainless grid protecting device; and the two probes are a temperature measurement probe and a relative humidity measurement probe respectively. The portable measurement instrument for micro water in oil is free from the influence of oil type, oil age and oil temperature, and is firm and reliable in structure and convenient for carrying.

Methods and systems are provided for conducting measurements of relative humidity via the use of an ultrasonic sensor. In one example, the ultrasonic sensor for conducting the relative humidity measurement is selected from a plurality of ultrasonic sensors positioned at various locations on the vehicle, and where the selecting is accomplished in some examples via the use of one or more onboard cameras configured to identify suitable objects that are stationary with respect to the vehicle. In this way, robustness and accuracy of relative humidity measurements may be improved, lifetime of individual ultrasonic sensors may be extended, and vehicle operating conditions that depend on accurate relative humidity measurements may be improved.

The invention relates to systems and methods for humidity determination and uses thereof. Methods and systems are provided for conducting measurements of relative humidity via the use of either an ultrasonic sensor positioned on the vehicle, or via another sensor. In one example, responsive to a request for a relative humidity measurement and an indication of fueled engine operation, the ultrasonic sensor may be utilized, whereas responsive to an indication of non-fueled engine operation, another sensor may be utilized. In this way, robust measurement of relative humidity with desired accuracymay be actively determined, rather than opportunistically, and such measurements of relative humidity may be utilized to adjust vehicle operating parameters, which may improve overall vehicle operation.

The invention relates to systems and methods for humidity determination and uses thereof. Methods and systems are provided for conducting measurements of relative humidity using an ultrasonic sensor.In one example, a plurality of ultrasonic signals having different frequencies are transmitted from a single sensor, and attenuation values of reflected signals are determined only for those signals determined to have the same transit time from transmission to receipt, and where frequency of the plurality of ultrasonic signals may be changed responsive to an indication that the signals may be below a signal-to-noise threshold. In this way, by determining a difference between attenuation values between pairs of signals, where the signals comprise different frequencies and where the signals comprise the same transit times, relative humidity may be accurately determined.

The invention discloses a system for measuring relative humidity at high temperature and high pressure, and relates to the field of humidity measurement. The system comprises a zirconia sensor, an environmental temperature collecting module, an environmental pressure collecting module, a main controller and a preheating module, wherein the preheating module is connected with a first output end of the main controller; the preheating module is used for preheating a zirconia sensor; the zirconia sensor is connected with a second input end of the main controller; the environmental temperature collecting module is connected with a third input end of the main controller; the environmental pressure collecting module is connected with a fourth input end of the main controller. Meanwhile, the invention also discloses a method for measuring relative humidity at high temperature and high pressure. The method and the system provided by the invention fully consider influences of environmental pressure and environmental temperature when solving environmental relative humidity, so as to measure the obtained relative humidity more accurately. Meanwhile, since measurement for a pressure value and a temperature value is easily drifted in high temperature and high pressure environment, measured values of the environmental pressure and the environmental temperature are further corrected in the invention to improve the solving accuracy of the relative humidity.

The invention discloses a relative humidity measurer which comprises a 555 time base circuit, a first resistor to a seventh resistor, a capacitor, a power supply and an adjustable capacitor. An output end of the power supply is respectively connected with a first end of the third resistor and a first end of the seventh resistor. A second end of the third resistor is respectively connected with a first end of the second resistor and a seventh pin end of the 555 time base circuit. A third pin end of the 555 time base circuit is connected with a first end of the fourth resistor, a second end of which is a signal output end of the relative humidity measurer. A second end of the seventh resistor is respectively connected with an eighth pin end of the 555 time base circuit and a first end of the sixth resistor. By the use of the relative humidity measurer, problems such as insufficient measurement accuracy and high power consumption existing in a relative humidity measurer in the prior art are solved. The relative humidity measurer provided by the invention has popularization and use value.