®
HS20
Relative Humidity Sensor
Telaire HS20 is a bulk-resistance type of Relative Humidity (RH) Sensor providing a variable impedance
value in response to the adsorbed water within the sensor’s proprietary thin-film polymer. Applied to an
interdigitated electrode, the polymer’s chemical functional groups disassociate into ionic groups in the
presence of water, increasing the sensor’s electrical conductivity. Excited by a low voltage alternating
current, the sensor’s resulting impedance is measured via supporting circuitry.
Features
• Low cost
• Low power
• Inverse exponential humidity response curve
• Fast response time
• Exceptional linearity
• Low hysteresis
• Excellent interchangeability
• Simple signal conditioning circuitry
• Wide operating range
• Small size
Applications
• HVAC controls
• White goods
• Handheld instruments
• Medical devices
• Wireless transmitters
• Asset monitoring
• Data loggers
• Consumer goods
• Automotive climate control
• Agriculture and horticulture
• Environmental chambers
• Enthalpy measurement
Amphenol
Advanced Sensors
HS20 Specifications
PARAMETER
Storage Temperature
Storage Humidity
Operating Humidity
Operating Temperature
Power Rating
Nominal Impedance Value
Tolerance on Impedance Value
53.9
MIN
0
20
30
0
LIMITS
TYP
MAX
50
90
90
50
UNIT
°C
%RH
%RH
°C
CONDITION
Without condensation
Do not allow dewdrops to form.
AC 1V
67.3
70.7
KΩ
KΩ
50Hz ~ 1KHz
25°C, 50%RH
Reliability
PARAMETER
Dry Heat Storage
Cold Storage
Damp Heat Storage
Heat Cycle Test
Low Humidity Storage
Dry Heat Operation
CRITERIA
<±5 %RH
<±5 %RH
<±5 %RH
<±5 %RH
<±5 %RH
<±5 %RH
CONDITION
80°C, 1000 hours
-40°C, 1000 hours
60°C, 90 %RH, 1000 hours
-40°C/30min ~ +80°C/30min, 100 cycles
25°C, 20 %RH, 1000 hours
80°C, 1000 hours, AC 1V, 1KHz
Absorption process
Desorption process
Figure 1: Typical Humidity Response Curve
Figure 2 Typical Sensitivity Characteristics
2
HS20 Specifications
Typical Sensitivity Characteristics
%RH
20
30
40
50
60
70
80
90
(Cont.)
5°C
100000
15500
2300.0
372.00
80.00
19.50
6.00
2.06
15°C
35000
5000.0
900.0
170.00
41.00
11.00
3.90
1.45
25°C
6000
1100.0
260.00
67.30
20.00
6.13
2.70
1.10
35°C
4000
800.0
180.00
44.00
14.00
4.50
1.90
0.860
45°C
2100
400.00
80.00
23.00
7.00
2.92
1.39
0.693
Dimensions
No.
1
2
3
4
5
6
7
Construction List
Substrate
Resistance
Polymer Film
Electrode
Epoxy Paste
Terminal
Epoxy Resin
Material
Alumina (A
l2
O
3
)
RuO
2
Organic Polymer
Pd-Ag
Ag
Black
Notes
1. Use only within specified conditions.
2. Do not disassemble or change any parts.
3. Do not touch sensor element.
4. Do not apply any direct current to the sensor.
5. Do not touch the film or the surface of the sensor.
6.
In use and stock, freezing, dust, mist, oil, alcohol,
corrosive gases or any other dirty/anomalous ambient
may cause degradation of the sensor’s characteristics.
7. Protect the sensor film from flux/fume and high tempera-
ture during soldering.
8. Do not immerse sensor in water.
3
Amphenol
Advanced Sensors
www.telaire.com
www.amphenol-sensors.com
© 2019 Amphenol Corporation. All Rights Reserved. Specifications are subject to change without notice.
Other company names and product names used in this document are the registered trademarks or
trademarks of their respective owners.
AAS-920-733A - 09/2019
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