HPP809A031 Datasheet HPP809A033, HPP809A031 | P1-P3

HTM2500LF – Temperature and Relative Humidity Module

HTM2500LF HPC169 Rev C www.meas-spec.com October 2012

1/9

•

Hermetic Housing

• Humidity calibrated within +/-2% @55%RH

• Temperature measurement through NTC

10kOhms +/-1% direct output

• Small size product

• Typical 1 to 4 Volt DC output for 0 to 100%RH

at 5Vdc

DESCRIPTION

Based on the rugged HTS2035SMD humidity / temperature sensor, HTM2500LF is a dedicated humidity and

temperature 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 humidity linear voltage output.

FEATURES

• Full interchangeability

• High reliability and long term stability

• Not affected by water immersion

• Ratiometric to voltage supply

• Suitable for 3 to 10 Vdc supply

voltage

Humidity Sensor Specific Features

• Instantaneous de-saturation after long periods in saturation

phase

• Fast response time

• High resistance to chemicals

• Patented solid polymer structure

Temperature Sensor Specific Features

• Stable

• High sensitivity

APPLICATIONS

•

Industrial

• Process control

• Hygrostat

• Data logger

…

HTM2500LF – Temperature and Relative Humidity Module

HTM2500LF HPC169 Rev C www.meas-spec.com October 2012

2/9

PERFORMANCE SPECS

MAXIMUM RATINGS

Ratings Symbol Value Unit

Storage Temperature

Tstg

-

40 to

8

5

°C

Storage Humidity

RHstg

0 to 100

% RH

Supply Voltage (Peak)

Vs

12

Vdc

Humidity Operating Range

RH

0 to 100

% RH

Temperature Operating Range

Ta

-

40 to

8

5

°C

Peak conditions: less than 10% of the operating time

ELECTRICAL CHARACTERISTICS

(Ta=23°C, Vs=5Vdc +/-5%, R

L

>1MΩ unless otherwise stated)

Humidity Characteristics Symbol Min Typ Max Unit

Humidity Measuring Range

RH

1

99

%RH

Relative Humidity Accuracy (10 to 95% RH)

RH

+/

-

3

+/

-

5

%RH

Supply Voltage

Vs

4.75

5.00

5.25

Vdc

Nominal Output @55%RH (at 5Vdc)

Vout

2.4

2

2.48

2.54

V

Current consumption

Ic

1.

0

1.

2

mA

Temperature Coefficient (10 to 50°C)

Tcc

+0.1

%RH/°C

Average Sensitivity from 33% to 75%RH

∆Vout/∆RH

+2

6

mV/%RH

Sink Current Capability (R

L

=15kΩ)

Is

300

µA

Recovery time after 150 hours of con

densation

tr

10

s

Humidity Hysteresis

+/

-

1.5

%RH

Long term stability

T

+/

-

0.5

%RH/yr

Time Constant (at 63% of signal, static) 33% to 76%RH

(1)

τ

5

s

Output Impedance

Z

70

Ω

(1) At 1m/s air flow

(Ta=25°C)

* For temperature upper than 60°C, specific high te mperature cable is required: HTM2500LFL products

Temperature Characteristics

Symbol

Min

Typ

Max

Unit

Nominal Resistance @25°C R 10 kΩ

Beta value: B25/50 β 3347 3380 3413 K

Temperature Measuring Range* Ta -40 85 °C

Nominal Resistance Tolerance @25°C R

N

1 %

Beta Value Tolerance β 1 %

Response Time

τ

10 s

HTM2500LF – Temperature and Relative Humidity Module

HTM2500LF HPC169 Rev C www.meas-spec.com October 2012

3/9

TYPICAL PERFORMANCE CURVES

HUMIDITY SENSOR

• Typical response look-up table (Vs = 5V)

RH (%)

Vout (mV)

RH (%)

Vout (mV)

10

1235

55

2480

15

1390

60

2605

20

1540

65

2730

25

1685

70

2860

30

1825

75

2990

35

1960

80

3125

40

2090

85

3260

45

2220

90

3405

50

2350

95

3555

• Modeled linear voltage output (Vs = 5V)

• Linear Equations

Vout = 26.65 * RH + 1006

RH = 0.0375 * Vout – 37.7

with Vout in mV and RH in %

• Polynomial Equations

Vout = 1.05E

-3

*

RH

3

- 1.76E

-1

*

RH

2

+ 35.2 * RH + 898.6

RH = -1.92E

-9

*

Vout

3

+ 1.44E

-5

*

Vout

2

+ 3.4E

-3

*

Vout – 12.4

with Vout in mV and RH in %

• Measurement Conditions

HTM2500LF is specified for accurate measurements within 10 to 95% RH.

Excursion out of this range (<10% or >95% RH, including condensation) does not affect the reliability of

HTM2500LF characteristics.

1000

1500

2000

2500

3000

3500

4000

0 10 20 30 40 50 60 70 80 90 100

Relative Humidity (%RH)

Output Voltage (mV)

0

10

20

30

40

50

60

70

80

90

100

1000 1500 2000 2500 3000 3500 4000

Output Voltage (mV)

Relative Humidity (%RH)

HPP809A031

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