PASCO CI-6559 User Manual
Instruction Sheet
for the PASCO
Model CI-6559
012-06437B
11/99
$1.00
HUMIDITY SENSOR
Humidity
Sensor
vented top
plate
aperture for
sensing element
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CI-6559
HUMIDITY
SENSOR
DIN connector
Introduction
The PASCO CI-6559 Humidity Sensor is designed to be
used with the PASCO ScienceWorkshop® computer
interface and DataStudio™ or ScienceWorkshop® software. The Humidity Sensor may be used for making
single readings or continuous monitoring of relative
humidity (RH).
Equipment Included:
• CI-6559 Humidity Sensor
• 6-foot cable with 8-pin DIN connectors
• instruction sheet
• storage bag
Additional Equipment Required:
• Any PASCO ScienceWorkshop®
computer
interface.
PASCO DataStudio™ software
Or
PASCO ScienceWorkshop®
2.2.5 or higher.
software, version
to computer interface
interface cable with
to Humidity Sensor
DIN connectors
Specifications
Range: 0% - 100% RH
Accuracy:
-no calibration ± 5% RH at 60% R H
± 8% at 90% RH
-with saturated salt calibration
± 2% 0% - 100% @25 °C
Resolution: 0.1% RH
Response Rate: 15 seconds in slow moving air
Repeatability: ± 0.5% RH
Connector Type: 8-pin DIN, ScienceWorkshop
interface compatible
Voltage Output: 0 - 10V (0% - 100% RH)
DIN Connector
1: analog output (+), 0-10 V
2: analog output (-), signal ground
3: no connection
4: +5 VDC power
5: power ground
6: +12 VDC power
7: -12 VDC power
8: no-connection
© 1997 PASCO scientific
Author: Steve Miller
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HUMIDITY
RELATIVE
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®
10101 Foothills Blvd. • P.O. Box 619011 • Roseville, CA 95678-9011 USA
Phone (916) 786-3800 • FAX (916) 786-8905 • email: techsupp@PASCO.com
better
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Humidity Sensor
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DIGITAL CHANNELS
ScienceWorkshop
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Theory
The Humidity Sensor consists of two basic elements:
the humidity sensing element and the signal condition
amplifier.
The humidity sensing element is powered by +5 volts
DC and outputs a DC voltage that is proportional to
the relative humidity of the air surrounding the sensing element. The element is an integrated circuit,
which features high reliability and fast response, and
is contamination resistant. The output voltage of the
sensing element varies between 0.8 and 3.9 VDC,
which corresponds to a relative humidity ranging from
0 to 100%, respectively.
Two stages of amplification are provided to condition
the signal from the humidity sensing element for input
to the ScienceWorkshop computer interface. The
output of these two stages will range from 0 to 10
VDC, which will correspond to 0 to 100% humidity.
The first stage is used to reference the sensor output
range from 0 to 3.1 volts. This establishes 0 volts as
the 0% relative humidity point. The second stage
applies a gain of about 3.2, which causes the maximum sensor output, 3.1VDC, to increase to 10VDC,
which corresponds to a 100% relative humidity. Both
DataStudio and ScienceWorkshop software take the
0 - 10V output from the sensor, multiply it by 10 and
display the result as relative humidity.
The Humidity Sensor can be plugged directly into any
ScienceWorkshop computer interface or connected to
the interface box using the supplied cable with 8-pin
DIN connectors.
Setup Procedure
1. Connect the Humidity Sensor and any analog
channel into the PASCO Computer Interface with
interface cable (Figure 1A),
or
Insert the DIN plug of the Humidity Sensor directly
into any analog channel on the PASCO Computer
Interface (Figure 1B).
2. Open the Experiment Setup window in DataStudio
or ScienceWorkshop. Click and drag the analog
plug icon to the analog channel icon that matches
the analog port you are using for the Humidity
Sensor.
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ANALOG CHANNELS
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ScienceWorkshop
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GAIN
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GAIN
1,10:ISOLATED
1,10: REF TO GND
1: REF TO GND
Plug into any
analog channel.
Plug into any
analog channel.
SENSOR
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Figure 1. Connecting the Humidity Sensor into the
computer interface.
3 . Select "Humidity Sensor" from the Sensors list
(DataStudio™) or drop-down menu
(ScienceWorkshop®).
4. Open a display window, such as the graph display.
In DataStudio, doubleclick the graph icon in the
display list. In ScienceWorkshop, drag and drop
the graph icon over the Humidity Sensor icon.
5. Additional display windows can be opened by following the procedure in step 4.
Operational Notes
To prevent damage to the Humidity
Sensor or other equipment, do not
immerse the Humidity Sensor in fluid.
The sensing element resists contamination
vapors, such as organic solvents, chlorine, and
ammonia. The element is also unaffected by
water condensation.
➤ For best results: The Humidity Sensor is
capable of responding fairly quickly to changes
in the humidity. However, in order to respond,
a sample of the environment (air) must reach the
sensing element (positioned near the sensor
aperture). The sensor responds quickest when it
is in a slow moving air stream. This may be
accomplished by moving the sensor slowly with
your hand during data collection.
➤ To avoid errors: The sensing element can be
affected by the bright light of the sun. Do not point
the aperture for the sensing element directly toward
the sun or a bright light.
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