PASCO CI-6605A User Manual

Instruction Sheet
012-08060C
Stainless Steel Temperature Sensor
CI-6605A
8 Pin DIN adapter
Plastic tubing
Stainless steel probe
Included Equipment
Stainless Steel Temperature Sensor
8 Pin DIN adapter
Plastic Tubing Cover, 0.5 ft.
Additonal equipment required Part Number
ScienceWorkshop® Interface or a
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PASPORT Analog Adapter
USB interface with an
PS-2158
DataStudio® Software
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, Fahren­heit, or Kelvin. The sensor consists of a stainless steel probe, a 3-foot cable, and an 8-pin connector.
Sensor Electronics and Internal Circuitry
The Thermistor used is a typical 10K thermistor with a nega­tive 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.
120
100
80
60
40
Temperature(ºC)
20
0
0 10,000 20,000 30,000 40,000
Resistance(ohms)
Figure 1: Temperature vs. Resistance Curve
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 resis­tor are built into the 8-pin DIN connector.
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The 10K thermistor circuit uses a precision voltage reference and a voltage divider to determine the thermistor’s resis­tance. The thermistor (Rt) is one resistor and a 13K resistor (R
) is the other in a two-resistor voltage divider network.
ref
Stainless Steel Temperature Sensor Equipment Setup
The voltage reference is connected to the top of the divider network and the voltage output is taken from the middle of the divider.
The relationship of the 10K thermistor’s resistance (Rt) to the voltage output (V
) is
out
Vout.Rref Vin -Vout
where V ohms.
The Steinhart-Hart equation is used to convert from resistance to temperature. Temperature (T) in degrees Celsius is:
(3.35x10
where R10=Rt/10,000.
DataStudio software converts the voltage to resistance and the resistance to temperature.
is the reference voltage, 10VDC and R
in
-3
+2.56x10
-4
.
ln(R10) + 2.38x10
1
-6
.
ln(R10)
2
+ 8.37x10
-8
.
ln(R10)
is 13K
ref
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Equipment Setup
6. In DataStudio, open a display and click the Start button.
Sample Temperature Data
-273.15
)
Using the Temperature Sensor with DataStudio Workbook Activities
Note: If you are using the Stainless Steel Temperature Sensor (SST) with a pre-existing DataStudio activity file or workbook for a different type of temperature sensor, do the following:
Note: The sensor is very accurate and generally does not need to be calibrated.
1. Plug the sensor’s DIN 8-pin connector into any analog channel (A, B, or C) on a ScienceWorkshop interface or a PASPORT USB interface with an analog adapter (PS-2158).
2. Open DataStudio. In the Welcome to DataStudio win­dow, double click “Create Experiment.”
CAUTION: Do not place the Stainless Steel Temperature Sensor in a direct flame or on a hot plate. To prevent damage to the sensor, do not exceed the range of -35°C to +135°C.
3. In the Sensors list of the Experiment Setup window, click and drag the Stainless Steel Temperature icon ( ) to the analog channel in which you have your sensor connected.
4. To change measurement units or view resistance values, double click on the Stainless Steel icon in the Setup win­dow. In the Measurement tab, select the desired measure­ment unit (°C,°F, K, or Kohms) and click the OK button.
5. Place the end of the probe in the solution, gas, or object you are measuring.
WARNING: To avoid burns or bodily injury, do not touch the end of the probe with your hand, fingers, etc. when measuring temperatures of hot liquids, materials, etc.
1. In the Setup window, click on and delete the existing Temperature Sensor icon.
2. In the sensors list, scroll to the SST Sensor icon( ). Click and drag the SST icon to an analog channel on the picture of the interface.
3. From the Data list, drag the SST icon to any open dis­plays.
Using the Temperature Probe in Chemical Solutions
The Stainless Steel Probe can be used in basic and mildly acidic solutions. Use an optional Teflon cover when placing the Stainless Steel Temperature (SST) probe in strong acids or chemical solutions that may damage the probe. When a Teflon cover is used, the probe can be placed in most chemical solutions. The Teflon cover will not change the temperature reading, but the sensor’s response to changes in temperature will be slower than when the cover is not used.
A package of ten Teflon Sensor Covers is available from PASCO scientific (part number CI-6549). See the PASCO cat­alog for more information.
CAUTION: Without the optional Teflon cover over the probe, do not use the probe in the following chemicals: Acetic Acid, Aluminum halides, Hydrochloric Acid, Iodine, Nitrating Acid, Phosphoric Acid, and
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Model No. CI-6605A Using the Temperature Sensor with a pH, Dissolved Oxygen, or Conductivity
Sulfuric Acid. For more information about chemical compatibility with #304 stainless steel, see the Cole-Parmer web site (www.coleparmer.com/techinfo).
Using the Temperature Sensor with a pH, Dissolved Oxygen, or Conductivity Sensor
The Stainless Steel Temperature Sensor is electrically grounded. Use an optional Teflon sleeve to isolate the probe of the Stainless Steel Temperature Sensor when it is used with electrically susceptible sensors, such as the pH (CI-6507A) and Conductivity Sensor (CI-6729)
Using the Temperature Probe in Air-Tight Containers
The diameter of the sensor’s stainless steel probe is slightly smaller than the 1/4-inch hole found in many rubber and cork stoppers. If an airtight seal in a stopper is required, the diame­ter of the stainless steel probe must be increased. A 6-inch piece of plastic tubing is included with the Stainless Steel Temperature Sensor for this purpose.
The tubing may be trimmed as required. A little bit of glycer­ine may be used on the tubing to assist in the process of slip­ping the tubing over the probe. For the best temperature response, place the tubing and stopper as close to the probe handle as is practical.
Specifications
Temperature range -35ºC to +135ºC,
-31ºF to +275ºF 238 to 408 K
Accuracy ±0.5ºC or better
Resolution 0.05ºC
Probe composition #304 stainless steel
Technical Support
For assistance with any PASCO product, contact PASCO at:
Address: PASCO scientific
10101 Foothills Blvd. Roseville, CA 95747-7100
Phone: 916-786-3800 (worldwide)
800-772-8700 (U.S)
Fax: (916) 786-3292
Web: www.pasco.com
Email: support@pasco.com
Limited Warranty
For a description of the product warranty, see the PASCO catalog.
Copyright
The PASCO scientific 012-08060C Stainless Steel Temperature Sensor Instruction Sheet is copyrighted with all rights reserved. Permission is
granted to non-profit educational institutions for reproduction of any part of this manual, providing the reproductions are used only in their laboratories and classrooms, and are not sold for profit. Reproduction under any other circumstances, without the written consent of PASCO scientific, is prohib­ited.
Figure 3: Probe with stopper and tubing
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Trademarks
PASCO, PASCO scientific, DataStudio, PASPORT, and ScienceWorkshop are trademarks or registered trademarks of PASCO scientific, in the United States and/or in other countries. All other brands, products, or ser­vice names are or may be trademarks or service marks of, and are used to identify, products or services of, their respective owners. For more infor­mation visit www.pasco.com/legal.
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Stainless Steel Temperature Sensor Technical Support
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