Solar Constant Model No. TD-8497
4
®
Introduction
The Solar Constant Set is used for discovering the rate at which radiant energy is received
from the sun. Using the included bracket and a standard ring stand, these cylinders can be
used to discover the solar constant or to simply compare the energy transfer to various
cylinders.
In a typical experiment, the cylinders are each placed on a temperature probe and secured in a
mounting bracket. The cylinders are taken outside and positioned such that each cylinder is
perpendicular to the sun’s light rays. Using a fourth temperature probe (such as our Fast
Response Temperature Probe (PS-2135), the ambient temperature can be measured
throughout the entire experiment. The student typically collects temperature vs. time data for
approximately one-half hour.
Setup Procedure
1. Insert a rod into a rod stand. Slide the rod clamp on
the mounting bracket over the rod, and tighten the
rod clamp.
2. With the big knob, set the angle so that the
temperature probe points directly at the sun.
Note: The cylinders are designed to only fit the new
stainless steel temperature probes (PS-2153 and CI-
6605). The PS-2153 probe can be used with either a
PASPORT Temperature Sensor (PS-2125), Pressure/
Temp. Sensor (PS-2146), Quad Temp. Sensor (PS-
2143), or the CI-thermistor Sensor (CI-6527A). The
CI-6605 Stainless Steel Temperature Probe plugs
directly into a CI-interface.
3. Insert each probe through the hole in the bracket
hole and tighten with a thumbscrew. Place a 1.5-in.
piece of blue tubing over the bottom third of the probe to protect the probe. Blue tubing is
provided with both the Stainless Steel Temperature Probe and the Solar Constant Set).
Note: When securing the probe in the plastic holder, make sure that the thumb screw seats
over the tubing, not directly on the stainless steel probe. Do not overtighten the screw, or you
may collapse the probe.
4. Use the holes in the cylinders to fit the cylinders on the tip of the probes. You can position
the cylinders either horizontally or vertically on the probe.
5. Connect each of the probes to a temperature sensor. (Note: The Quad Temp. Sensor (PS-
2143) accommodates all four probes.)
Figure 1: Setup with
cylinders on temperature
probes
(2 pages)
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