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Humidity Sensors
Copyright ©2008 Honeywell International Inc. All rights reserved.
 Honeywell.com
Relative Humidity Sensor Technology Comparison
• Four types of humidity sensors
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Capacitive: The best RH sensor; low cost
Resistive: Lowest cost; declining market share
Tin oxide: Poor interchangeability and stability
Aluminum oxide: Used in ultra-low RH conditions
• Honeywell’s HIH-Series use capacitive RH sensing
plus circuitry
– Thermoset polymer capacitor is more rugged
– Laser trimming provides enhanced interchangeability
– Relative Humidity Integrated Chip (RHIC) provides on-chip
signal conditioning with the capacitor
Thermoset polymer capacitor solution uses capacitive relative humidity sensing
and circuitry to provide the best humidity range and lowest cost implementation.
 Honeywell.com
Honeywell’s HIH Series Humidity Sensors
• HIH Series of relative humidity sensing products are solid-state
devices designed to offer a pre-packaged, small and highly accurate
method of detecting the percentage of relative humidity.
• How the Complimentary Metal Oxide Semiconductor (CMOS)- based
RH sensor works:
– As the bottom thermoset polymer layer absorbs water, the dielectric of the
capacitor and the observed capacitance increases.
– The upper thermoset polymer layer provides
additional physical protection.
– Thermoset polymers provide much better
environmental resistance than typical
thermoplastic polymers.
 Honeywell.com
Honeywell’s HIH Series Portfolio
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Wide relative humidity sensing range
Enhanced accuracy
Enhanced response time
Excellent, laser-trimmed 5% interchangeability
Ratiometric, near-linear analog voltage output vs. %RH
Chemically resistant
Stable, low-drift performance
Low current draw (typical 200 µA)
Operating temperature range: -40 °C to 85 °C
Supply voltage required: 4 Vdc to 5.8 Vdc
RoHs compliant
 Honeywell.com
Relative Humidity Sensor Potential Applications
• HVAC
– Humidistats
– Commercial and
residential building
controls
– Humidifiers
– Dehumidifiers
– Enthalpy sensors
– Fan systems
• Additional applications
– Transport and stationary
container refrigeration systems
– Medical respiratory and incubator
equipment
– Weather stations/radiosondes
– Telecommunications cabinets
– Office automation
– Drying equipment
– Air compressors
– Processing/packaging equipment
 Honeywell.com
HIH-4000 Series Humidity Sensors
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SIP packages with 0.1 and 0.05 inch lead spacing
Uncovered
Lowest cost solution for CMOS type
Mounts directly into PCBs
5% interchangeability (0% RH to 59% RH)
Optional calibration data available
Effective August 4, 2008, the HIH-4000 will adopt the same
lead frame as that used on the HIH-4010 series
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HIH-4602-A/C Series Temperature/Humidity Sensors
• TO-5 can package
• Hydrophobic sintered stainless steel filter provides enhanced
sensor protection
• On-board temperature sensor for direct temperature output
• “A” version features a 100 kOhm thermistor
• “C” version features 1k ohm platinum RTD
60µ pore hydrophobic
sintered SST filter
• 5% interchangeability (0 to 59% RH)
• Includes calibration data
• Often ideal for dew point and absolute humidity/moisture
measurements
 Honeywell.com
HIH-4602-L Harsh Environment Sensor
• TO-39 can package
• Slotted cap enables fast response while maintaining the
robustness of an enclosed component
• On-board RTD temperature sensor for direct temperature
output
• 5% interchangeability (between 0 to 59%RH)
• Calibration data available with HIH-4602-L-CP
 Honeywell.com
HIH-4010/4020/4021 Series Humidity Sensors
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HIH-4010: uncovered, SIP with 0.05 or 0.1 inch leads
HIH-4020: covered with 0.05 or 0.1 inch leads
HIH-4021: covered, condensation-resistant with 0.05 or 0.1 inch leads
5% interchangeability (0 to 59% RH)
Optional calibration data available
Smaller plastic package as compared to HIH-4000
Faster response time (5 sec) as compared to HIH-4000 (15 sec)
Effective August 4, 2008, HIH-4000 will adopt same lead frame as that
used on HIH-4010 Series
HIH-4010
HIH-4020
HIH-4021
 Honeywell.com
HIH-4010/4020/4021
Hydrophobic
Filter
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=
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Proposed P/N
50004018
HIH-4020-002
Cover
HIH-4010-002
Filter is
glued onto
cover
HIH-4021-002
Filter is
glued onto
cover
Hydrophobic
Filter
+
HIH-4010-001
+
=
Cover
HIH-4020-001
=
Proposed P/N
50004018
HIH-4021-001
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HIH-4030/4031 Series Humidity Sensors
• HIH-4030: uncovered, surface mount (SMD)
• HIH-4031: covered, surface mount (SMD)
• Supplied in 1000 piece, tape and reel packaging (often ideal for
high volume applications)
• SMD packaging on tape and reel allows for use in high volume,
automated pick and place manufacturing, eliminating lead
misalignment to printed circuit board through-hole and lowers
OEM manufacturing process cost
• 5% interchangeability (0 to 59% RH)
• Optional calibration data available
• Sample packs available for stocking: HIH-4030-001S,
-003S, HIH-4031-001S, -003S
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HCH-1000 Series Humidity Sensors
• HCH-1000-001: uncased, capacitive-output with 0.1 inch lead pitch
• HCH-1000-002: cased, capacitive-output with 0.1 inch lead pitch (for
dust protection/handling during OEM assembly)
• Capacitive polymer sensor consists of a grid top electrode, a
polyimide layer, and a bottom electrode (grid top electrode on the
bottom provides enhanced sensitivity)
• No active signal conditioning on board = capacitance type (pF) output
• 2% hysteresis/linearity, typical
• Operating temperature range: -40 °C to 120 °C
• Often ideal for high-volume, cost-sensitive applications where
capacitance output is acceptable (i.e., ≤ $2 target price)
• RoHs compliant
HCH-1000-001
HCH-1000-002
Applying Humidity Sensors
Copyright ©2008 Honeywell International Inc. All rights reserved.
 Honeywell.com
Ratiometric Output
• The output voltage is proportional to the supply voltage in a set
ratio
• For example, the device output at 5 Vdc supply will typically be
0.8 Vdc to 3.9 Vdc
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Typical Sensor Output
Typical Sensor Output over RH Range
4
Sensor Output
Linear (Sensor Output)
3.5
Device Output (Voltage)
3
y = 0.03x + 0.7172
R2 = 0.9978
2.5
2
1.5
1
0.5
0
0
10
20
30
40
50
%RH
60
70
80
90
100
 Honeywell.com
Interchangeability
What does Interchangeability = ±5% at 0% RH mean?
• Defines the range of voltages for any population of sensors at this
RH point.
– This is compared to the baseline output for the RHIC chip, which is 0.8 V to
3.9 V (0 to 100% RH) with a supply voltage of 5 Vdc.
• If you take the typical slope*, 0.031 V/%RH times ±5%RH you get
±0.155 V.
• This means that the output voltage for this device is 0.8 V ±0.155 V
or a range of 0.645 V to 0.955 V.
• When exposed to an RH of 0%, the output of the entire population
of sensors will fall within this range.
• The interchangeability increases with increasing RH since the RHIC
die is actively trimmed only at 0% RH. Trimming at other RH values
is impractical.
*Typical slope = (3.9V - 0.8V)/100% RH = 0.031V/%RH
 Honeywell.com
Interchangeability and Accuracy
• Interchangeability at 0% RH
– Interchangeability lets you lower design costs by avoiding calibrating
your system to each individual sensor.
– The RHIC sensor keeps its interchangeability and accuracy advantages
at higher humidity.
0%RH
• Accuracy at 0% RH
– Accuracy = Interchangeability ±5% when you don’t calibrate your
system to each sensor.
 Honeywell.com
Temperature Effects
Typical Effects of Temperature
4.5
0C
4
Device Output (Voltage)
25C
3.5
50C
3
70C
2.5
2
1.5
1
0.5
0
0
20
40
60
%RH
80
100
 Honeywell.com
Humidity Application Questions
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What is the operating temperature range?
What is the storage temperature range?
What is the operating humidity range?
What accuracy is needed from the sensor?
Is there a required output from the sensor other than voltage?
Is there a preference with SIP or surface mount (SMD)?
Will there be condensation in the application?
– (Preface condensation questions that the device is specified for noncondensing environments today.)
– How many condensation cycles?
– Does the sensor need to function while in a condensing environment?
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Timing of the project?
What is the price target?
What is the volume and ramp up scenario?
Who is the competitor and do we know their part number?
 Honeywell.com
Humidity Sensors Contact Information
• Product Manager – Valerie Rothermel-Nelson
– [email protected]
• Application Engineer – Bob Ward
– [email protected]
• Thermal applications (Europe) – Alex Geddes
– [email protected]
• Thermal applications (Asia-Pacific) David Rong
– [email protected]
• General technical support and product cross reference
– 1-800-537-6945
– [email protected]