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
DIMENSIONS
g
H7508A Room Humidity / Temperature Sensor
Dimensions in mm (inch)
mountin
holes
4.6
(0.18)
(2x)
132
(5.2)
(3.35)
85
172
(6.77)
11
(0.43)
(2x)
4.2
(0.17)
(3x)
60
(2.36)
(0.79)
20
118.5
(4.67)
100.5
(3.96)
23.5
(0.93)
INSTALLATION
230Vac
Transformer f or
sensors and actuators
24Vac
95
(3.74)
Fig. 2 Dimensions of special housing
Sensor
1
5 / 6
0...1V/
0...10V
27
Common
Fig. 3 Installation Example
Controller
rh Input
Common
60
(2.36)
24Vac 230Vac
Transformer f or
controller
3 EN0C-0795 0497R0-MA
H7508A Room Humidity / Temperature Sensor
Mounting and Installation Advice:
Mount the sensor where it is protected against rain and
•
direct sun radiation, preferably on the north side of the building.
If this is not practical, it should be shielded from sun’s rays.
Mount the sensor preferably on that outside wall of the buildings
•
having windows of the main occupancy rooms to be controlled.
Provide sufficient air circulation for accurate measurement.
•
Seal the cable conduit to avoid false measurement due to draught
•
of warm air from the conduit.
Ensure that the cable inlet holes on the sensor housing are sealed
•
properly and that the cable runs from the bottom to the top into the
cable entry as shown in Fig. 4 below to prevent that rain water
enters the sensor housing.
Do not mount the sensor over windows, doors, air extractors or
•
other heat sources or underneath the eaves of the roofs or a
balcony.
Offset due to wire resistance per 10m distance from sensor
to controller:
Type of wire Temperature offset
Pt 1000 BALCO 500 NTC
2
0.5mm
(AWG20)
1.0mm
(AWG17)
1.5mm
(AWG15)
0.18°C (0.324°F) 0.3°C (0.54°F)
2
0.09°C (0.162°F) 0.15°C (0.27°F) negligible
2
0.06°C (0.108°F) 0.1°C (0.1°F)
NOTE
CAUTION
Use shielded wiring in areas with high
EMI.
Keep 15cm (5.9’’) minimum distance
between sensor lines and 230Vac
power lines.
Use two transformers: one for sensors
and actuators and one for the
controller (see Fig. 3).
Wiring run
Sensor to controller
Maximum length
200m (660ft)
Wiring connection
24V
10
1
2
3
4
5
6
7
8
9
24V
Pt 1000 / NTC
BALCO 500
0...1V
0...10V
COM = 24V
POWER SUPPLY
TEMPERATURE SENSOR
REL. HUMIDITY SENSOR
Fig. 4 Installation
Honeywell Regelsysteme GmbH Helping You Control Your World
Honeywellstr. 2-6
D-63477 Maintal
Tel. (0 61 81) 401-1
Fax (0 61 81) 4 54 56
Subject to change without notice. Printed in Germany.
EN0C-0795 0497R0-MA
Manufacturing location is certified according to
DIN
EN ISO 9001
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