1.Seminar UNRI UKM Ke–5 Tahun 2008

Permanent URI for this collection

https://repository.unri.ac.id/handle/123456789/5609

Browse

Browsing 1.Seminar UNRI UKM Ke–5 Tahun 2008 by Author "Umar, Lazuardi"

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    DEVELOPMENT OF LOW-COST CAPACITANCE-TYPE SENSOR FOR LIQUID LEVEL MEASUREMENT
    (2014-03-10) Umar, Lazuardi
    In this paper, an attempt has been made to design a low-cost noncontact capacitancetype level sensor for a conducting liquid. The sensor is in the form of a uniform circular stainless steel cylinder of type IC-00179H-2005/I and BS4127-ALSI304, with diameter of 15-25mm and 700mm length. The inner electrode is made of insulating material of PTFE-insulated wire with diameter 0.52 - 3.0 mm. The minimum of measured capacitance is 52.81 pF with sensitivity of 0.283 pF/mm by the maximum water level of 550mm.
  • No Thumbnail Available
    Item
    RECONSTRUCTION OF THE R-T-CURVE OF THE THERMISTOR SENSOR BASED ON PARAMETER EXTRACTION OF THE CURRENT-VOLTAGE CURVE
    (2014-03-10) Umar, Lazuardi
    A parameter extraction of the current-voltage curve of the thermistor sensor for reconstruction of its resistance-temperature dependency curve is proposed. The sensor is supplied with variable voltage of 0-30V and measured in a climatic room with temperature from -20°C to +80°C to obtain the current-voltage characteristic. Parameter extraction is used to control parameter changes of important sensor parameters such as resistances RTo and the temperature coefficient b of the thermistor itself in accordance to the temperature TM of the medium. The result of the parameter extraction gives RTo value 143.286 Ω at temperature of 373K, temperature coefficient b1 0.01 K-1 and b2 9.993 10-3 K-2 respectively and are used to reconstruct the R-T-curve.