Related Manuals for E+E Elektronik HCT01
Summary of Contents for E+E Elektronik HCT01
- Page 1 AN1111-2 Developer’s Guide for HCT01 Humidity and Temperature Sensors Rev. 0.2 / 09 /2015...
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Page 2: Table Of Contents
AN1111-2 Table of content: Driving circuitry for HCT01 ......................4 Pre-adjusted HCT01 with an initial accurate circuitry with frequency output ........6 Schematic circuit diagram ....................... 6 2.1.1 Bill of Material ..........................6 2.1.2 Correlation between sensor capacity and period ................7 RH measurement with pre-adjusted HCT01 and microcontroller based, initially accurate circuitry 8 Schematic circuit diagram ....................... -
Page 3: Driving Circuitry For Hct01
AN1111-2 1 Driving circuitry for HCT01 HCT01 is a capacitive, thin-film sensor for relative humidity (RH) in a robust SMD enclosure. The enclosure can accommodate an optional high precision temperature (T) sensor – a prerequisite for precisely calculating dew point. - Page 4 AN1111-2 Choice of HCT01 version and driving circuitry Figure 1: Circuitry options for HCT01 Rev. 0.2 / 09 /2015...
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Page 5: Pre-Adjusted Hct01 With An Initial Accurate Circuitry With Frequency Output
AN1111-2 2 Pre-adjusted HCT01 with an initial accurate circuitry with frequency output The circuitry in Fig. 2 delivers a frequency output signal, where the period of the signal is proportional to the capacity of the RH sensor and consequently with the relative humidity at the sensor. The accurate measurement of the period requires a precise time base such as a quartz crystal. -
Page 6: Correlation Between Sensor Capacity And Period
Figure 3: The sensitivity is approx. 0,064 µs/% rH (with a rise of 0.25 pF/% rH) Nominal characteristic @5,0 V relative humidity [% rH] Figure 4: Nominal characteristic of the measuring device with frequency output Figure 5: Example of RH & T measuring device with HCT01 and frequency output Rev. 0.2 / 09 /2015... -
Page 7: Rh Measurement With Pre-Adjusted Hct01 And Microcontroller Based, Initially Accurate Circuitry
HCT01 microcontroller based, initially accurate circuitry A measuring device with pre-adjusted HCT01 and with a microcontroller based initially accurate circuitry can achieve an accuracy of ±2,24 % rH. A detailed description of the circuitry is available in the E+E patent EP 1 574 847 B1 // US 7,084,644 3.1 Schematic circuit diagram... -
Page 8: Bill Of Material
3.1.1 Bill of Material Quantity Symbol Device Dimension Supplier 1 pc HCT01 Humidity sensor HCT01-02 or HCT01-03 E+E Elektronik 1 pc Fast Si-Diode 1SS400TiG 1 pc Resistor 1 µF, ceramic / X7R 1 pc Existing... - Page 9 AN1111-2 The nominal characteristic of the device (HCT01 sensor together with electronics) can be determined by measurement at various levels of relative humidity. Example of nominal characteristic @3V3 relative humidity [% rH] Figure 7: Example of nominal characteristic The deviation from the reference RH after correcting for PCB influences and hysteresis is shown in Figure 8.
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Page 10: Hints For The Development Engineer
Figure 9: Initial accurate electronics – 1 point C_Cal; PCB corrected 4 Hints for the development engineer Choose HCT01 version and the driving circuitry according Figure 1 depending on the accuracy and output requirements as well as on existing electronics. -
Page 11: Contact Information
Please visit our website to find your local contact. 6 Revision history Date Revision number Changes November 2011 V_0.1 Initial release September 2015 V_0.2 Revised version Copyright© 2014, E+E Elektronik. Subject to technical changes and misprints All rights reserved Rev. 0.2 / 09 /2015...
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