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| Philips Components Product specification Humidity sensor APPLICATIONS * Humidity measurements in electronic hygrometers for domestic use * Self-regulating air humidifiers, etc. DESCRIPTION This capacitive atmospheric humidity sensor consists of a non-conductive foil, which is covered on both sides with a layer of gold. The dielectric constant of the foil changes as a function of the relative humidity of the ambient atmosphere and, accordingly, the capacitance value of the sensor is a measure for relative humidity. The foil is clamped between contact springs and assembled in a plastic housing. It is provided with two connecting pins which fit printed-circuit boards with a grid pitch of 2.54 mm, provision is also made for fastening with 3 mm bolts. The characteristics are not affected by incidental water condensation on the sensor foil. It should not be exposed to either acetone or chlorine vapours. QUICK REFERENCE DATA PARAMETER Humidity range (RH) Capacitance at +25 C; 43% RH; 100 kHz Sensitivity between 12 and 75% RH Frequency Maximum AC or DC voltage Storage humidity range (RH) Ambient temperature range: operating storage Drop test: height of free fall Mass 1 2322 691 90001 VALUE 10 to 90 122 15% 0.4 0.05 1 to 1000 15 0 to 100 0 to +85 -25 to +85 % UNIT pF pF/%RH kHz V % C C m g 1.3 1996 Nov 12 1 Philips Components Product specification Humidity sensor MECHANICAL DATA Marking PHILIPS H1. Mounting The device can be soldered directly on to a printed-circuit board or fastened with 3 mm bolts. Soldering Solderability: 240 C; 4 s. Resistance to heat: 240 C; 4 s. 5.08 3 1.15 max 23.0 0.5 15.5 0.5 2322 691 90001 Robustness of terminations Tensile strength: 10 N. 3.1 0.1 17.0 11.5 0.5 0.5 5.0 0.5 MBD125 Dimensions in mm. Fig.1 Component outline. 1996 Nov 12 2 Philips Components Product specification Humidity sensor 2322 691 90001 ELECTRICAL CHARACTERISTICS Unless otherwise stated, measurements are in accordance with "IEC publication 539". Stability is in accordance with "CECC 43000" and "IEC 68-2". PARAMETER Humidity range (RH) Capacitance at +25 C; 43% RH; 100 kHz Tan at +25 C; 100 kHz; 43% RH Sensitivity between 12 and 75% RH Frequency range Temperature dependence Response time in minutes (to 90% of indicated RH change at +25 C, in circulating air): between 10 and 43% RH between 43 and 90% RH Hysteresis (for RH excursion of 10 to 90 to 10%) Maximum AC or DC voltage Storage humidity range (RH) Ambient temperature range: operating storage Mass 0 to +85 -25 to +85 1.3 C C g <3 <5 3 15 0 to 100 % V % VALUE 10 to 90 122 15% 0.035 0.4 0.05 1 to 1000 0.1 pF/%RH kHz %RH/K % pF UNIT 150 C (pF) 140 MEA832 130 120 110 0 50 RH (%) 100 Fig.2 Typical capacitance as a function of relative humidity. 1996 Nov 12 3 |
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