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TECHNICAL 1 DATA
RELATIVE HUMIDITY MODULE HM 1500
Based on the rugged HS1101 capacitive humidity sensor, HM1500 is a dedicated humidity transducer designed for OEM applications where a reliable and accurate measurement is needed. Direct interface with a micro-controller is made possible with the module's linear voltage output.
MAIN FEATURES
G G G G G G G G G Small size Not affected by water immersion Full interchangeability High reliability and long term stability Typical 1 to 4 Volt DC output for 0 to 100 % RH at 5 V DC supply Calibrated within +/- 2 % RH @ 55 % RH Very low temperature dependence Ratiometric to voltage supply within the specified range Suitable for 3 to 7 Volts supply voltage
HM 1500
HUMIDITY SENSOR SPECIFIC FEATURES
G G G G Instantaneous de-saturation after long periods in saturation phase. Patented solid polymer structure. High resistance to chemicals. Fast response time.
OPERATING RANGE
100
1
2
MAXIMUM RATINGS
Ratings Symbol Value Unit
RELATIVE HUMIDITY IN %
INTERMITTENT OPERATION 75
ST EA DY
Storage Temperature Supply Voltage (Peak) Humidity Operating Range
Tstg Vs RH
-30 to 70 7 0 to 100 -30 to 60
C Vdc % RH C
50
E AT ST
25
Temperature Operating Range Ta
Peak conditions : less than 10% of the operational time.
0 -40
-20
0
20
40
60
80
AMBIENT TEMPERATURE IN C
CHARACTERISTICS
Characteristics
(Ta = 23C, Vs = 5Vdc, RL
> 1M otherwise stated)
Symbol Min. Typ. Max. Unit.
Humidity measuring range Relative Humidity accuracy (10 to 95 % RH) Voltage supply Nominal output @ RH = 55 % Current consumption Temperature coefficient (10 to 50 C ) Averaged Sensitivity from 33% to 75% RH Sink current capability (RL = 15 k) Recovery time after 150 hours of condensation Humidity Hysteresis Long term stability Response time (33 to 76 % RH, static, @ 63 %) Output impedance
RH RH Vs Vout Ic Tcc
1 +/- 3 4.75 2.42 5.00 2.48 0.4 + 0.1 + 25
99 +/- 5 5.25 2.54 0.8
% RH % RH V V mA % RH/C mV /% RH
mV /% RH
Is t
300 10 +/-1.5 0.5
A s % RH % RH/yr s
Z
10 70
HPC009 Rev. H October 2001
TECHNICAL 2 DATA
MEASUREMENT CONDITIONS
G HM1500 is specified for accurate measurements within 10 to 95% RH. G Excursion out of this range (< 10% or > 95% RH, including condensation) does not affect the reliability of HM1500 characteristics. G Dedicated HM15XX Product are available for extreme RH conditions (as HM1520 for low dewpoints) Consult HUMIREL for further information.
Output Voltage (mV)
HM 1500 Typical Measuring Ranges in Humidity
4000
HM 1504
3500
3000
METROLOGY HM 1500 RANGE
2500
2000
1500
METROLOGY HM 1520 RANGE
1000 0 10 20 30 40 50 60 70 80 90 100
Relative Humidity in %
HM1500 MODELLED LINEAR VOLTAGE OUTPUT (VS = 5V)
4000
REFERENCE OUTPUT VALUES RH (%) Vout(mV) RH (%) Vout(mV) 1325 10 2480 55 1465 15 2605 60 1600 20 2730 65 1735 25 2860 70 1860 30 2990 75 1990 35 3125 80 2110 40 3260 85 2235 45 3405 90 2360 50 3555 95
3500
Output Voltage (mV)
3000
2500
2000
1500
Vout = 25.68 RH + 1079 from 10 to 95 % RH
with Vout in mV and RH in %
1000 0 10 20 30 40 50 60 70 80 90 100
Relative Humidity in % RH
Reversed Polynomial Equation
Vout = 9E-4RH3 -1.3E-1RH2 + 30.815RH + 1030
ERROR BUDGET AT 23C
6 5 4
HM1500 ERROR LIMITS
Delta in % RH
3 2 1 0 -1 -2 -3 -4 -5 -6 0 10 20 30 40 50 60 70 80 90 100
Temperature coefficient compensation
RHCor% = RH%
Read
* (1 -(Ta -23)* 2.4E-3)
Relative Humidity in % RH
2 1.5
Non linearity and temperature compensation
RH% = -1.919E-9Vout3 + 1.335E-5Vout2 + 9.607E-3Vout - 21.75
Delta in % RH
1 0.5 0 -0.5 -1 -1.5 -2 0 10 20 30 40 50 60 70 80 90 100
1 + (Ta-23) * 2.4E-3
All equations Vout in mV, RH in %, Ta in C.
Relative Humidity in % RH
LINEARITY ERROR OF HM1500 MODULE
HPC009 Rev. H October 2001
TECHNICAL 3 DATA
HUMIDITY MEASUREMENT USING HM1500
Typical HM 1500 relative Humidity measurement
100 80
Relative Humidity (% RH)
70
60
50
40
30
% RH = 0.0391 Vout -42.5 from 10 to 95 % RH
20
with Vout in mV and RH in %
10 0 1000 1500 2000 2500 3000 3500 4000
Output Voltage (mV)
Internal block diagram of HM1500
Reference Oscillator L.P. Filter Sensor Oscillator Gain Vout -->
Suggested applications for HM1500 Steps of 1% RH are achievable by using 8-bit A/D. If more resolution is required a 10 -bit A/D needs to be used and a third display will be added, giving steps of 0.2% RH
Read AINO
VCC5
VCC5
U1
3 4 16 15 RTCC MCLR OSC1 OSC2/CLK RA/AIN0 RA/AIN1 RA/AIN2 RA/AIN3 RBO RB1 RB2 RB3 RB4 RB5 RB6 RB7
17 18 1 2
C2
X1
PIC16CXXX With A/D
6 7 8 9 10 11 12 1317
HM150X
C1
VCC5
1 3
Calculate RH% using equation or using alook up table
VI
7805
GND
VO
VCCIN
Convert RH% to BCD code Send data to display
2
HPC009 Rev. H October 2001
TECHNICAL 4 DATA
G RESISTANCE TO PHYSICAL AND CHEMICAL STRESSES - HM1500 has passed through qualification processes of HUMIREL including vibration, shock, storage, high temperature and humidity, ESD. - Additional tests under harsh chemical conditions demonstrate good operation in presence of salt atmosphere, SO2 (O.5%), H2S (0.5%), O3, NOx, NO, CO, CO2, Softener, Soap, Toluene, acids (H2SO4, HNO3, HCl), HMDS, Insecticide, Cigarette smoke, a non exhaustive list. - HM1500 is not light sensitive. G SPECIFIC PRECAUTIONS - HM1500 is not protected against reversed polarity - Check carefully when connecting the device. - If you wish to use HM1500 in a chemical atmosphere not listed above, consult us.
A
B
PACKAGE OUTLINE HM1500
Dim
Min (mm)
Max (mm)
A B C D
9.70 5.00 52 11.2 200
10.20 5.50 54 11.6 250
D
C
E*
* specific length available on request
Wire
E
Color
Function
W1 W2
W1 W2 W3
White Blue Yellow
GROUND SUPPLY VOLTAGE OUTPUT VOLTAGE
W3
ORDERING INFORMATION (MULTIPLE PACKAGE QUANTITY OF 10 PIECES). HM1500 : HUMIDITY ANALOG VOLTAGE OUTPUT MODULE.
SAMPLE KIT OF HM1500 IS AVAILABLE THROUGH HUMIREL WEB SITE
www.humirel.com
email : sales@humirel.com
The information in this sheet has been carefully reviewed and is believed to be accurate; however, no responsability is assumed for inaccuracies. Furthermore, this information does not convey to the purchaser of such devices any license under the patent rights to the manufacturer. Humirel reserves the right to make changes without further notice to any product herein. Humirel makes no warranty, representation or guarantee regarding the suitability of its product for any particular purpose, nor does Humirel assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability, including without limitation consequential or incidental damages. Typical parameters can and do vary in different applications. All operating parameters, including Typical must be validated for each customer applications by customer's technical experts. Humirel does not convey any license under its patent rights nor the rights of others. Humirel products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other application intended to support or sustain life, or for any application in which the failure of the Humirel product could create a situation where personal injury or death may occur. Should buyer purchase or use Humirel products for any such unintended or unauthorized application, Buyer shall indemnify and hold Humirel and its officers, employees, subsidaries, affiliates and distributors harmless against all claims, costs, damages and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of presonal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Humirel was negligent regarding the design or manufacture of the part.Humirel is a registred trade mark of Humirel.
HPC009 Rev. H October 2001

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