PL97740B2 - - Google Patents

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Publication number
PL97740B2
PL97740B2 PL185255A PL18525575A PL97740B2 PL 97740 B2 PL97740 B2 PL 97740B2 PL 185255 A PL185255 A PL 185255A PL 18525575 A PL18525575 A PL 18525575A PL 97740 B2 PL97740 B2 PL 97740B2
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PL
Poland
Prior art keywords
temperature
thermistor
measurement
thermistors
resistors
Prior art date
Application number
PL185255A
Other languages
Polish (pl)
Other versions
PL97740B1 (en
Inventor
Krupa Ryszard
Gorecki Tadeusz
Original Assignee
Wyzsza Szkola Inzynierska
Filing date
Publication date
Application filed by Wyzsza Szkola Inzynierska filed Critical Wyzsza Szkola Inzynierska
Priority to PL18525575A priority Critical patent/PL97740B1/en
Priority claimed from PL18525575A external-priority patent/PL97740B1/en
Publication of PL97740B1 publication Critical patent/PL97740B1/en
Publication of PL97740B2 publication Critical patent/PL97740B2/pl

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Description

Przedmiotem wynalazku jest uklad do pomiaru temperatury, zwlaszcza zdalnego z wybieraniem punktów pomiarowych. Uklad do pomiaru temperatury za pomoca termistora, czy termistorów znajduje zastosowanie przy zdalnym pomiarze temperatury w wielu punktach obiektów trudnodostepnych, na przyklad w powlokach chlodni kominowych, czy innych budowlach wiezowych. Termistory sa czujnikiem temperatury, powszechnie stosowanym w wielu urzadzeniach pomiarowo-kon¬ trolnych. Tradycyjnie, stosowane jest bezposrednie polaczenie termistora, zamontowanego na obiekcie, którego temperatura ma byc mierzona, z pozostalymi elementami ukladu, takimi jak zródlo zasilania czy miernik wielkosci elektrycznej. W takim ukladzie polaczen sygnal elektryczny, zbierany z termistora zalezy wykladniczo od mierzonej temperatury, co powoduje, ze czulosc ukladu i dokladnosc odczytu wartosci temperatury w róznych przedzialach skali temperatury jest niejednakowa. Ponadto, przy tradycyjnym ukladzie polaczen, sygnal elektryczny zbierany bezposrednio z termistora jest stosunkowo niewielki, co utrudnia lub wrecz unie¬ mozliwia pomiary w warunkach wystepowania wysokiego poziomu zaklócen elektrycznych, na przyklad na terenie elektrowni. Istote wynalazku stanowi uklad do pomiaru temperatury za pomoca termistora, polaczonego równolegle z jednym z elementów zlozonego z dwu rezystorów dzielnika napiecia, stanowiacego obciazenie zródla zasilania ukladu pomiarowego. Zaleta ukladu w porównaniu z dotychczasowym stanem techniki jest jego prosta budowa, jak i stosowanie ukladu w warunkach istnienia wysokiego poziomu zaklócen elektrycznych. Dobór rezystorów wchodzacych w sklad dzielnika napiecia pozwala osiagnac liniowa zaleznosc sygnalu elektrycznego od temperatury. Tym samym zapewniona jest stalosc czulosci ukladu i dokladnosci odczytu wartosci temperatury w calym przedziale pomiarowym. Przyklad rozwiazania wedlug wynalazku, uwidoczniony jest na rysunku, na którym fig. 1 przedstawia schemat blokowy urzadzenia, a fig. 2 — charakterystyke ukladu.2 97 740 Uklad sklada sie z zasilacza 1 obciazonego szeregowo polaczonymi rezystorami 2 i 3, stanowiacymi dzielnik napiecia. Równolegle do rezystora 3 podlaczony jest termistor 4, umieszczony na badanym obiekcie 5. Wynik pomiaru jest rejestrowany za pomoca woltomierza cyfrowego 6 polaczonego równolegle z rezystorem 3. Sprzezenie woltomierza cyfrowego 6 z ukladem rejestracji danych na tasmie perforowanej 7, pozwala na szybkie opracowanie wyników pomiarów za pomoca maszyny cyfrowej. Wlaczenie w uklad wybieraka sygnalu 8 pozwa¬ la na wybieranie w zaprogramowanej kolejnosci sygnalów pochodzacych od wielu termistorów 4 umieszczonych w wielu róznych punktach na badanym obiekcie 5. Czujniki temperatury, termistory 4, zamontowane na badany- m obiekcie 5, polaczone sa z pozostala czescia ukladu pomiarowego, w sklad którego wchodza zasilacz 1, re¬ zystory 2 i 3, woltomierz cyfrowy 6, perforator 7 i wybierak sygnalu 8, za pomoca dlugiej linii przewodowej* Zaleznosc mierzonego i rejestrowanego przez uklad sygnalu Uw od temperatury obiektu I, na przyklad komina, na którym umieszczony jest czujnik temperatury, termistor 4, przedstawiona jest na fig. 2. PLThe invention concerns a temperature measurement system, particularly a remote one with the selection of measurement points. A temperature measurement system using a thermistor or thermistors is used for remotely measuring temperature at multiple points in difficult-to-access objects, such as the shells of cooling towers or other tower structures. Thermistors are a temperature sensor commonly used in many measurement and control devices. Traditionally, a direct connection is used between the thermistor, mounted on the object whose temperature is to be measured, and the remaining system components, such as a power source or an electrical meter. In such a connection system, the electrical signal collected from the thermistor depends exponentially on the measured temperature, which causes the system's sensitivity and the accuracy of temperature readings to vary across different temperature scale ranges. Moreover, with traditional connection systems, the electrical signal collected directly from the thermistor is relatively small, making measurements difficult or even impossible in environments with high levels of electrical interference, such as those found in power plants. The invention is based on a temperature measurement system using a thermistor connected in parallel to one of the elements of a two-resistor voltage divider, which serves as the load for the measuring system's power supply. The advantage of this system over prior art is its simple design and its suitability for use in environments with high levels of electrical interference. The selection of resistors within the voltage divider allows for a linear relationship between the electrical signal and temperature. This ensures consistent system sensitivity and temperature reading accuracy throughout the measurement range. An example of the solution according to the invention is shown in the drawing, where Fig. 1 shows a block diagram of the device, and Fig. 2 — the characteristics of the system.2 97 740 The system consists of a power supply 1 loaded with series-connected resistors 2 and 3, constituting a voltage divider. A thermistor 4, located on the tested object 5, is connected in parallel to resistor 3. The measurement result is recorded using a digital voltmeter 6 connected in parallel with resistor 3. Coupling the digital voltmeter 6 with the data recording system on perforated tape 7 allows for quick processing of measurement results using a digital machine. The inclusion of the signal selector 8 in the circuit allows for selecting, in a programmed order, signals from many thermistors 4 placed in many different points on the tested object 5. Temperature sensors, thermistors 4, mounted on the tested object 5, are connected to the remaining part of the measuring system, which includes the power supply 1, resistors 2 and 3, digital voltmeter 6, perforator 7 and signal selector 8, by means of a long wire line*. The dependence of the signal Uw measured and recorded by the circuit on the temperature of the object I, for example a chimney, on which the temperature sensor, thermistor 4, is placed, is shown in Fig. 2. EN

PL18525575A 1975-12-03 1975-12-03 SYSTEM FOR MEASURING TEMPERATURE, ESPECIALLY REMOTE, WITH SELECTING THE MEASURING POINTS PL97740B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL18525575A PL97740B1 (en) 1975-12-03 1975-12-03 SYSTEM FOR MEASURING TEMPERATURE, ESPECIALLY REMOTE, WITH SELECTING THE MEASURING POINTS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL18525575A PL97740B1 (en) 1975-12-03 1975-12-03 SYSTEM FOR MEASURING TEMPERATURE, ESPECIALLY REMOTE, WITH SELECTING THE MEASURING POINTS

Publications (2)

Publication Number Publication Date
PL97740B1 PL97740B1 (en) 1978-03-30
PL97740B2 true PL97740B2 (en) 1978-03-31

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PL18525575A PL97740B1 (en) 1975-12-03 1975-12-03 SYSTEM FOR MEASURING TEMPERATURE, ESPECIALLY REMOTE, WITH SELECTING THE MEASURING POINTS

Country Status (1)

Country Link
PL (1) PL97740B1 (en)

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