PASCO CI-6605A Stainless Steel Temperature Sensor - Manual

®
Instruction Sheet
012-08060C
Stainless Steel Temperature Sensor
CI-6605A
Introduction
The PASCO Model CI-6605A Stainless Steel Temperature
Sensor is used for measuring the temperature of liquids (such
as water and mild chemical solutions), air, and other materials.
The temperature can be measured in degrees Celsius, Fahren-
heit, or Kelvin. The sensor consists of a stainless steel probe,
a 3-foot cable, and an 8-pin connector.
The CI-6605A consists of a thermistor built into a stainless
steel tube. The thermistor allows for resistance measurements
in Kohms. A precision voltage reference and reference resis-
tor are built into the 8-pin DIN connector.
Sensor Electronics and Internal Circuitry
The Thermistor used is a typical 10K thermistor with a nega-
tive temperature coefficient. It is called a 10K thermistor
because the resistance value at standard temperature (25°C) is
10K ohms. As the temperature increases, the resistance of the
thermistor decreases.
Figure 1 illustrates a typical resistance vs. temperature curve
for a thermistor.
Figure 1: Temperature vs. Resistance Curve
The 10K thermistor circuit uses a precision voltage reference
and a voltage divider to determine the thermistor’s resis-
tance. The thermistor (Rt) is one resistor and a 13K resistor
(R
ref
) is the other in a two-resistor voltage divider network.
Plastic tubing
8 Pin DIN adapter
Stainless steel probe
Additonal equipment required Part Number
ScienceWorkshop
®
Interface or a
PASPORT
®
USB interface with an
Analog Adapter
PS-2158
DataStudio
®
Software
Included Equipment
Stainless Steel Temperature Sensor
8 Pin DIN adapter
Plastic Tubing Cover, 0.5 ft.
0
20
40
60
80
100
120
0 10,000 20,000 30,000 40,000
Resistance(ohms)
Temperature(ºC)