TECHNICAL DATA
Humirel Sensor Device Data / HPC009-20 RevA December 2000 1
PRELIMINARY DATA SHEET
RELATIVE HUMIDITY MODULE
HM1520
Based on the rugged HS1101 humidity sensor, HM1520 is a dedicated humidity transducer
designed for measurements at low humidity. Direct measurement of dew point or water
concentration can be easily obtained in really cost effective conditions. Direct interface with a
micro-controller is made possible with the module’s linear voltage output.
Main features
• Tubular form for through wall mounting.
• Not affected by water condensation
• Full interchangeability.
• Typical 1 to 1.6 Volt DC output for 0 to 20% RH at 5 V DC supply.
• Calibrated, linear voltage for easy electronic interface.
• Controlled temperature dependency
• Ratiometric to voltage supply
Humidity sensor specific features
• No affected by long period at low humidity values.
• Patented solid polymer structure.
• High resistance to chemicals.
• Fast response time.
Maximum ratings
Ratings Symbol Value Unit
Supply Voltage (Peak) Vs 12 Vdc
Operating Range (see graph below) RH 0 to 100 % RH
Operating Range (Dew Point) Td -50 to 30 °C
Operating Range in Temperature Ta -30 to 60 °C
Accuracy of HM1520 when used from 1 to 95% RH
-10,0
-8,0
-6,0
-4,0
-2,0
0,0
2,0
4,0
6,0
8,0
10,0
010 20 30 40 50 60 70 80 90 100
Relative Humidity in % Rh
Optimized
accuracy
range
+/- 3 to 5% RH
accuracy range
+/- 5 to 10% RH
accuracy range
TECHNICAL DATA
Humirel Sensor Device Data / HPC009-20 RevA December 2000 2
Characteristics (Vs = 5.0Vdc , RL > 1 MΩ otherwise stated)
Characteristics Symbol Min Typ Max Unit
Humidity measuring range / Ta –30 to 60°C RH 1 99 %RH
Relative Humidity accuracy(1-20%RH) at 23°C RH +/-2 +/- 3
%RH
Relative Humidity accuracy at 55% RH at 23°C RH +/-5 %RH
Voltage supply Vs4.75 5.00 5.25 V
Nominal output @ RH = 10 % / Ta 25°C Vout 1.17 1.24 1.31 V
Current consumption Ic0.4 0.8 mA
Temperature coefficient(10 to 50 °C and 1 to 20% RH) Tcc < 0.1 %RH / °C
Averaged Sensitivity from 5% to 10 % RH ∆mV/%RH
+26 mV/%RH
Output Impedance Z 70 Ohms
Sink current capability (RL = 15 kohm) Is300 µA
Humidity Hysteresis +/-1.5 % RH
Long term stability 0.5 %RH/yr
Response time (5 to 10% RH, static, @63%) τ5 s
HM1520 Preliminary Specification when used from 1 to 30% RH
Vout= VS ( 5.12 RH + 197) *
or
RH = 0.195 Vout / VS - 38.5 *
with Vout in mV, VS in V and RH in %
1000
1100
1200
1300
1400
1500
1600
1700
1800
1900
2000
0 5 10 15 20 25 30 35
Relative Humidity in % RH
• Those equations can be used above 30% RH and allow to obtain an over all accuracy as described in page one of this
document in all the humidity measuring range
• Temperature (in the range 0 to 50°C) does not affect HM1520 measurement when used from 1 to 30% RH. No temperature
compensation is required.
•
Signal output from 1 to 20% RH at 23°C :
RH (%) 0 1 2 3 4 5 6 7 8 9 10
Vout (mV) 1013 1038 1064 1089 1115 1141 1166 1192 1217 1243
RH (%) 11 12 13 14 15 16 17 18 19 20
Vout (mV) 1269 1294 1320 1346 1371 1397 1422 1448 1474 1499
With Vs = 5.0 Volts DC
Calibration data are traceable to NIST standards through CETIAT laboratory.
TECHNICAL DATA
Humirel Sensor Device Data / HPC009-20 RevA December 2000 3
IMPORTANT NOTICE : HM1520 is based on HS1101 capacitive sensor and thus is fully
useable on a large range of relative humidity ( 1 to 99% RH). In that range, HM1520 presents a
typical accuracy of +/-5% RH at 55% RH.)
However HM1520 is a dedicated module for humidity measurements at low Relative Humidity levels.
Thus, HM1520 is also well adapted to measure water concentrations (ppm) or low dew points
when associated with an ambient temperature probe.
HM1520 features an optimized accuracy for water concentration below 6000ppm water or 0°C dew
point at 23°C (equivalent to 20% RH) .
TYPICAL OUTPUT of HM1520 when measuring
water concentration at ambient temperature of 23°C :
ppm 0 275 550 825 1100 1375 1650 1925 2200 2470 2750
Vout (mV) 1013 1038 1064 1089 1115 1141 1166 1192 1217 1243
ppm 3025 3300 3570 3850 4120 4395 4670 4945 5220 5495
Vout (mV) 1269 1294 1320 1346 1371 1397 1422 1448 1474 1499
ppmwater = 10.75 Vout - -10615 with Vout in mVolts
TYPICAL OUTPUT of HM1520 when measuring
dew point at ambient temperature of 23°C :
°C -36 -29 -24 -21 -18.5 -16 -14.5 -13 -11.5 -10
Vout (mV) 1013 1038 1064 1089 1115 1141 1166 1192 1217 1243
°C -9 -7.8 -6.8 -5.8 -4.9 -4.1 -3.2 -2.5 -1.6 -1.1
Vout (mV) 1269 1294 1320 1346 1371 1397 1422 1448 1474 1499
TECHNICAL DATA
Humirel Sensor Device Data / HPC009-20 RevA December 2000 4
Internal Block Diagram
Package outline HM1520
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,
subsidiaries, affiliates and distributors harmless against all claims, costs, damages and expenses, and reasonable attorney fees arising out of, directly or
indirectly, any claim of personal 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.
Reference Oscillator
Sensor Oscillator
L.P. Filter Gain
Vout
Vout-->
A 9.70 10.20
B 5.00 5.50
C 52 54
D 10.7 11.1
E 100 250
DIM
MAX
MIN
DIMENSIONS IN MILLIMETERS
A
B
C
D
W1 W2
W3
WIRING
WIRE COLOR FUNCTION
W1 WHITE GND
W2 BLUE VOLTAGE
W3 YELLOW OUTPUT
HM1500