Honeywell H7508A PRODUCT DATA

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H7508A

COMBINED OUTSIDE AIR HUMIDITY/

TEMPERATURE SENSOR

PRODUCT DATA

FEATURES

• Pt 1000, BALCO 500 or NTC temperature sensing

element

• Wide sensing range

• Capacitance type sensing element for relative

humidity

• Special housing for outside application

Fig. 1 Outside Air Humidity / Temperature Sensor

GENERAL

The H7508A Combined Outside Air Humidity / Temperature
Sensor incorporates a capacitance type relative humidity
sensor with a Pt 1000, BALCO 500 or NTC temperature
sensor in one housing.

The H7508A can be used for control, indication and alarm
monitoring in commercial or industrial installations.

Models

OS-No. Temperature Sensor Type

H7508A1026 Pt 1000

SPECIFICATION

General:

Power supply 24Vac, +20...-30%; 50/60Hz,

34Vdc, +20...-30%
Current consumption 20mA @ 24V
Ambient

operating limits -30...50°C (-22...122°F), 5...95%rh

non condensing

(below 0°C the humidity

measurement is inaccurate)
Ambient

storage limits -25...+70°C (-13...+158°F), 5...95%rh

non condensing
Dimensions see Fig. 2
Weight 130g
Case plastic ( ABS )

flame retardend acc. to UL94-HB
Mounting Wall, surface or wall outlet box

Protection Standard IP 34 acc. to EN60529
Safety Class III acc. to EN60730-1

H7508A1034 BALCO 500
H7508A1042

20kΩ NTC

This product meets the requirements of

EN0C-0795 0497R0-MA

CE

H7508A Room Humidity / Temperature Sensor

Temperature:

Temperature sensing
range -30...70°C (-22...158°F)

Nominal value

Pt 1000 1000Ω @ 0°C
BALCO 500 500Ω @ 23.3°C
NTC 20kΩ @ 25°C

Accuracy

Pt 1000
BALCO 500
NTC

Sensitivity

Pt 1000

BALCO 500 2Ω/K
Characteristic see EN0C-0603
Response time

τ

0.5 Pt 1000

τ

0.5 Balco 500

τ

0.5 NTC

0.3K acc. to DIN IEC 751 Class B

±

0.4K @ 23.3°C

±

0.2K at 25°C

±

3.85Ω/K

≈

9min

<≈

9min

<≈

11min

<≈

Overview

Following sensors can be applied for the following control
systems:

Control systems Temperature Humidity

Pt 1000 20kΩ NTC BALCO 500 0...1Vdc 0...10Vdc

Relative Humidity:

Humidity sensing
range 5...95%rh

Output signal 0...1V / 0...10V = 0...100%rh
Output impedance

1V range 183

10V range 274
Outputs short circuit protected
Sensitivity 10mV / %rh or 100mV / %rh
Accuracy

5...10%rh

10...30%rh

30...70%rh

70...90%rh

90...95%rh

Response time

10%

±

5%

±

3%

±

5%

±

±

τ

Ω
Ω

10%

0.5

= 80s

Excel Classic X X X X
Excel Plus X X X X
High Performance Excel Plus X X X X
Excel EMC X X X X
Excel 500/600 (XF521) X X X
Excel 500/600 (XF526) X X X X
Excel 20 & 50 X X
Excel 80B & 100B X X X
Excel IRC Multicontroller

R7451A1030
MicroniK 100 X X
MicroniK 100 ”NEW”

R7420B1036/R7420F1045
MicroniK 200 X X X X

XXX

XX

EN0C-0795 0497R0-MA 2