PASCO CI-6628 User Manual

Instruction Sheet for the PASCO Model CI-6628
INFRARED SENSOR
mounting
thumbscrew
with washer
TARE
GAIN
1
10
100
INFRARED SENSOR
CI-6628
cable with DIN
connectors
012-06915B
to computer
interface
shutter bracket
Introduction
The sensing element used in the PASCO CI-6628 Infrared Sensor is a thermopile. Thermopile detectors are voltage-generating devices that can be thought of as a miniature array of thermocouples. The thermopile is a high output, thin film, silicon based device which has 48 thermopile junctions. The active or ‘Hot’ junctions are blackened to efficiently absorb radiation. The reference or ‘Cold’ junctions are maintained at the ambient temperature of the detector
The blackening material used on the ‘Hot’ junctions is capable of absorbing radiant energy from ultra violet to the far infrared. In order to limit the spectral sensitivity, optical filters and windows may be placed in front of the detector. The window installed in the detector is a ruby­based material which has a spectral response from
CI-6628
Infrared Sensor
unit
visible light to the far infrared (about 40,000 nano­meters). The hermetically sealed detector is heat treated and filled with argon gas to improve long term stability.
The absorption of radiation by the blackened area causes a rise in temperature in the ‘hot’ junctions as compared to the ‘cold’ junctions of the thermopile. This difference in temperature across the thermocouple junction causes the detector to generate a positive voltage. If the active or ‘hot’ junction were to cool to a temperature less than the reference or ‘cold’ junction the voltage output would be negative.
The output of the thermopile detector is presented to a gain selectable amplifier. The GAIN switch located on the top of the sensor is used to adjust the
© 1999 PASCO scientific
Infrared Sensor 012-06915B
output of the sensor to a level appropriate for the experiment being performed. Gain settings of 1X, 10X and 100X are provided. The gain settings on the sensor coupled with the user selectable gain of the PASCO Computer Interface allow a very broad range of measurements to be made with the Infrared Sensor.
Operation
Note: This instruction sheet was written assuming
that the user has a basic familiarity with Science Workshop and has access to the User’s
The TARE switch located on the top of the sensor allows the output of the sensor to be zeroed. This is
Guide for Science Workshop. Users can gain basic skills by working through the tutorial within
particularly useful at high gain settings where small voltage offsets may interfere with measurements.
The shutter provided with the sensor has two functions. The tab on the front edge is used to give
ScienceWorkshop
500
Interface
E
S
R
S
1
P
T
G
O
O
L
DIGITAL CHANNELS
2
ANALOG CHANNELS
®
s
n
A
ON
=
GAIN
1,10:ISOLATED
B
GAIN
1,10: REF TO GND
C
=
=
GAIN
1: REF TO GND
constant spacing between the sensing element and a hot object when performing comparative radiant energy measurements. The spring loaded shutter keeps unwanted radiated energy from heating the sensing element before a measurement is taken.
Equipment
INCLUDED
• Infrared Sensor unit
• 1/4-20 X .375” thumbscrew (washer included)
• shutter bracket
• cable with DIN connectors
ADDITIONAL REQUIRED
• computer (PC or Macintosh)
Science Workshop
Science Workshop higher
Spare parts are available as follows:
Item Part Number
8-pin DIN cable 514-06329 .250” I.D. washer 615-011 1/4-20 X .375” thumbscrew 617-008 shutter bracket 648-06954
®
computer interface
®
software version 2.2 or
CI-6628
INFRARED SENSOR
TARE
GAIN
1
10
100
Figure 1
Connecting the amplifier box to the interface bo x
Science Workshop. Another useful resource is the Quick Reference Card for Science Workshop.
Setting up the Equipment
1. Connect the Infrared Sensor unit to analog
channel A, B, or C of the Science Workshop computer interface box using the cable with the DIN connectors (Figure 1). Alternatively, the unit can be plugged directly into the analog channel jack without using the cable.
2. Select the appropriate gain setting on the
sensor box for the light levels to be measured
2
012-06915B Infrared Sensor
10
1
100
GAIN
TARE
1
4
3
5
2
6
7
8
Tare
button
Adjust the gain
for the light
conditions
TARE
GAIN
1
10
100
FRARED SENSOR
Figure 2
Setting the Gain On the Infrared Sensor
shutter bracket
1/4-20
thumb-
screw
and washer
28
1/4-20 threaded
connector
Note the orientation of components as illustrated in
alignment hole
1/4-20 threaded
connector
Figure 4
Mounting connector and alignment hole
Figure 3. Mount the shutter bracket to the Infrared Sensor unit, with the included hardware, as shown. Do not over tighten thumbscrew.
Mounting on an Experimental Apparatus
Use the 1/4-20 threaded connector located on the bottom of the sensor box to secure the Infrared Sensor to an experimental apparatus (Figure 4). The alignment hole fits over an alignment pin included on some PASCO apparatuses.
DIN Connector Specifications
1: analog output (+), -10 to +10 V 2: analog output (-), signal ground
Figure 3
Installation of Shutter Bracket
3: (no connection) 4: + 5 V DC power
(Figure 2). The correct gain setting is the one for which the intensity levels on the display vary appropriately for measuring the relative light intensity changes in your experiment.
Using the Shutter Bracket
3
Infrared Sensor 012-06915B
5: power ground 6: +12 VDC power 7: -12 VDC power 8: (no connection)
Limited Warranty
PASCO scientific warrants the product to be free from defects in materials and workmanship for a period of one year from the date of shipment to the customer. PASCO will repair or replace, at its option, any part of the product which is deemed to be defective in material or workmanship. The warranty does not cover damage to the product caused by abuse or improper use. Determination of whether a product failure is the result of a manufacturing defect or improper use by the customer shall be made solely by PASCO scientific. Responsibility for the return of equipment for warranty repair belongs to the customer. Equipment must be properly packed to prevent damage and shipped postage or freight prepaid. (Damage caused by improper packing of the equipment for return shipment will not be covered by the warranty.) Shipping costs for returning the equipment after repair will be paid by PASCO scientific.
Address: PASCO scientific
10101 Foothills Blvd. Roseville, CA 95747-7100
Phone: (916) 786-3800
FAX: (916) 786-8905
email: techsupp@pasco.com
web: www.pasco.com
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