HIH-4602-A/C Series
Humidity Sensors
DESCRIPTION
HIH-4602-A/C Series Relative Humidity (RH) sensors combine
both relative humidity and temperature sensing in a TO-5
housing with a hydrophobic sintered stainless steel filter.
The laser-trimmed, thermoset polymer capacitive sensing
elements have on-chip integrated signal conditioning.
The temperature sensor is thermally connected with the RH
sensor making the HIH-4602-A/C often ideal for measuring
dew point and other absolute moisture terms.
The HIH-4602-A contains an integral thermistor, while the HIH-
4602-C contains an integral precision RTD.
Factory calibration data supplied with each sensor allows
individually matched downstream electronics and ±3.5 %RH
total accuracy.
FEATURES
• Near linear voltage output vs %RH
• Laser-trimmed interchangeability
• Enhanced accuracy, fast response
• Chemically resistant
• Stable, low drift performance
• Built-in static protection
• Often ideal for dew point and absolute moisture
measurements
• TO-5 housing
POTENTIAL APPLICATIONS
• Refrigeration
• Drying
• Meteorology
• Battery-powered systems
• OEM (Original Equipment Manufacturer) assemblies
HIH-4602-A/C Series
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TABLE 1. PERFORMANCE SPECIFICATIONS (At 5 Vdc supply and 25 ºC [77 ºF] unless otherwise noted.)
Parameter Minimum Typical Maximum Unit Specific
Note
Interchangeability (first order curve) – – – – –
0% RH to 59% RH -5 – 5 % RH –
60% RH to 100% RH -8 – 8 % RH –
Accuracy (best fit straight line) -3.5 – +3.5 % RH 1
Hysterisis – 3 – % RH –
Repeatability – ±0.5 – % RH –
Settling time – – 70 ms –
Response time (1/e in slow moving air) – 50 – s –
Stability (at 50% RH in one year) – ±1.2 – % RH –
Voltage supply 4 – 5.8 Vdc –
Current supply – 200 500 µA –
Output voltage temp. coefficient at 50% RH, 5 V – -4 – mV/ºC –
Voltage output (1st order curve fit) VOUT=(VSUPPLY)(0.0062(sensor RH) + 0.16), typical at 25 ºC
Temperature compensation True RH = (sensor RH)/(1.0546-0.00216T), T in ºC
Operating temperature -40[-40] See Figure 1. 85[185] ºC[ºF] –
Operating humidity 0 See Figure 1. 100 % RH 2
Storage temperature -50[-58] – 125[257] ºC[ºF] –
Storage humidity See Figure 2. % RH 2
Specific Notes:
1. Device is calibrated at 5 Vdc and 25 ºC.
2. Non-condensing environment.
General Notes:
• Sensor is ratiometric to supply voltage.
• Extended exposure to >90% RH causes a reversible shift of
3% RH.
• Sensor is light sensitive. For best performance, shield sensor
from bright light.
FACTORY CALIBRATION DATA
HIH-4602 Sensors are supplied with a calibration and data
printout. See Table 2.
TABLE 2. EXAMPLE DATA PRINTOUT
Model HIH-4602-C
Channel 92
Wafer 030996M
MRP 337313
Calculated values at 5 V
VOUT at 0% RH
VOUT at 75.3% RH
0.826 V
3.198 V
Linear output for 3.5% RH
accuracy at 25 °C
Zero offset
Slope
RH
0.826 V
31.483 mV/%RH
(VOUT - zero offset)/slope
(VOUT - 0.826)/0.0315
Ratiometric response for
0% RH to 100% RH
VOUT
VSUPPLY (0.1652 to 0.7952)
TABLE 3. HIH-4602-A NTC THERMISTOR TEMPERATURE
SPECIFICTIONS
Rb = 100 kOhm ±5% at 25 ºC
Beta = 4250, 25 ºC to 85 ºC
1/T = a + b(Ln R) + c(Ln R) ^ 3, T in degrees K
Low
Mid
High
Temp. ºC
0
50
100
Resistance
351000
33590
5569
a = 0.000828083
b = 0.000208691
c = 8.0812E-08
TABLE 4. HIH-4602-C RTD TEMPERATURE SENSOR
SPECIFICATIONS
Thin film platinum RTD – Class 2B (Ro: ±0.25%)
DIN EN 60571 (PER IEC 751)
TCR = 3750 ppm/ºC
1000 Ohm at 0 ºC [32 ºF]
Humidity Sensors
Honeywell Sensing and Control 3
FIGURE 1. OPERATING ENVIRONMENT (Non-condensing environment.)
FIGURE 2. STORAGE ENVIRONMENT (Non-condensing environment.)
HIH-4602-A/C Series
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FIGURE 3. TYPICAL OUTPUT VOLTAGE VS RELATIVE HUMIDITY (At 25 ºC and 5 V.)
0.5
1
1.5
2
2.5
3
3.5
4
0 20406080100
Relative Humidity (%RH)
Output Voltage (Vdc)
Sensor Response
Sensor Response
Best Linear Fit
FIGURE 4. TYPICAL OUTPUT VOLTAGE (BFSL) VS RELATIVE HUMIDITY (At 0 ºC, 70 ºC and 5 V.)
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
0 102030405060708090100
Relative Humidity (%)
Output Voltage (Vdc)
0 C
70 C
Humidity Sensors
Honeywell Sensing and Control 5
FIGURE 5. HIH-4602-A/C 1MOUNTING DIMENSIONS (For reference only. mm/[in])
1. Case ground
2. Vdc out
3. (-) Power or ground
4. (+) Vdc supply
5., 6. HIH-4602-A thermistor for temperature compensation
5., 6. HIH-4602-C RTD for temperature compensation
FIGURE 6. RH SENSOR CONSTRUCTION
Sensor construction consists of a planar capacitor with a second polymer layer to protect against dirt, dust, oils and other hazards.
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FIGURE 7. TYPICAL APPLICATION CIRCUIT
ORDER GUIDE
Catalog Listing Description
HIH-4602-A Monolithic IC humidity sensor with integral thermistor in TO-5 can
HIH-4602-C Monolithic IC humidity sensor with integral precision RTD in TO-5 can
FURTHER HUMIDITY SENSOR INFORMATION
See the following associated literature at www.honeywell.com/sensing:
• Product installation instructions
• Application sheets:
– Humidity Sensor Performance Characteristics
– Humidity Sensor Theory and Behavior
– Humidity Sensor Moisture and Psychrometrics
– Thermoset Polymer-based Capacitive Sensors
Humidity Sensors
Honeywell Sensing and Control 7
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Automation and Control Solutions
Sensing and Control
Honeywell
1985 Douglas Drive North
Minneapolis, MN 55422
www.honeywell.com/sensing
009022-1-EN IL50 GLO Printed in USA
January 2007
© 2007 Honeywell International Inc. All rights reserved.
WARNING
MISUSE OF DOCUMENTATION
• The information presented in this product sheet is for
reference only. Do not use this document as a product
installation guide.
• Complete installation, operation, and maintenance
information is provided in the instructions supplied with
each product.
Failure to comply with these instructions could result
in death or serious injury.
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defective materials and faulty workmanship. Honeywell’s
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customer to determine the suitability of the product in the
application.
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WARNING
PERSONAL INJURY
DO NOT USE these products as safety or emergency stop
devices or in any other application where failure of the
product could result in personal injury.
Failure to comply with these instructions could result
in death or serious injury.
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of sales offices, representatives and distributors. For
application assistance, current specifications, pricing or name
of the nearest Authorized Distributor, contact your local sales
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E-mail: info.sc@honeywell.com
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