PASCO Specialty & Mfg. CI-6532A User's Manual
Contents
1. Workshop and has access to the User s Guide for Science Workshop Users can gain basic skills by working through the tutorial within Science Workshop Another useful resource is the Quick Reference Card for Science Workshop DIN Connector Specifications 1 2 3 4 5 6 7 8 no connection 5 V DC power power ground 12 VDC power 12 VDC power R no connection analog output 10 to 10 V analog output signal ground PASC CON secrentifie Pressure Sensor Absolute 0 to 700 kPa 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 PASCO2. 012 06859B 10 98 Instruction Sheet 1 00 for the PASCO Model CI 6532A PRESSURE SENSOR ABSOLUTE 0 TO 700 kPa cable with DIN connectors polyurethane syringe tubing to computer interface quick release connectors 4 pressure port Pressure Sensor connector unit Introduction Equipment The PASCO Model CI 6532A Pressure Sensor INCLUDED Absolute is designed to be used with a PASCO Science Workshop computer interface The CI e Pressure Sensor Absolute unit e quick release connectors 4 6532A includes the pressure sensor unit e polyurethane tubing 0 6m extension cable with 8 pin DIN connectors quick e plastic syringe 20cc calibrated ADDITIONAL REQUIRED e computer PC or Macintosh release connectors polyurethane tubing and a syringe pP gt The pressure sensing element in the pressure Science Workshop computer interface sensor unit has two pressure ports One port is connected to the atmosphere via the pressure port connector at the front of the pressure sensor unit The other port is internal to the pressure sensing element and is sealed with a reference vacuum The sensor element is designed to be used with non corrosive gases such as air helium nitrogen etc Do not expose the sensor to liquids e Science Workshop software version 2 2 or higher Extra parts are available as follows Item Part Number plastic syringe 699 084 polyu
3. by monitoring the increase or decrease in pressure For example Boyle s Law is a classic physics and chemistry concept that can be demonstrated using the sensor and the syringe See Figure 2 quick release tip connector barb tubing Figure 2 Using the syringe To connect the syringe to the sensor cut a short length of tubing about one inch Put the barb end of one of the quick release connectors into one end of the short piece of tubing Put the other end of the tubing over the tip on the end of the syringe Note You can lubricate the end of the barb to make it easier to put into the short piece of tubing Put a very small amount of silicon oil or saliva onto the barb and then wipe the barb with a cloth so there is only a thin layer of lubricant on the barb Align the quick release connector with the pressure port connector of the sensor Push the connector onto the port and then turn the connector clockwise until it clicks into place less than one eighth of a turn The barb of the quick release PASC ON screntific Pressure Sensor Absolute 0 to 700 kPa connector is free to rotate even when the connector is firmly attached to the port See Figure 3 Push the connec tor onto the pressure port Turn the connec tor clockwise until it clicks less than 1 8 turn quick release connector pressure port connector tubing Figure 3 Using the quick
4. f the sensor is 0 5 kPa when used with a PASCO computer interface This resolution translates into other pressure units as follows Units Resolution inches of Hg 0 148 mm of Hg 3 750 milliBar 5 088 pounds per square inch psi 0 072 atmospheres 0 004 The sensor box contains a precision operational amplifier op amp that can drive a heavy capacitive load such as a six meter extender cable CI 6515 There is a resistor in parallel with the transducer to compensate the sensor for temperature induced variations The sensor has a negative temperature coefficient resistance decreases as temperature increases and the resistor has a positive temperature coefficient Operation Setting up the Equipment 1 Connect the Pressure 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 Figure 1 Connecting the amplifier box to the interface box PASC Ce scientific 012 06859B 2 Connect the quick release connector to the pressure port connector on the Pressure Sensor unit The sensor is temperature compensated therefore changes in room temperature will not interfere with the data Using the Syringe and Quick Release Connectors The Pressure Sensor is designed for experiments such as those that study the gas laws or for the rate of a chemical reaction
5. release connectors Mounting on an Experimental Apparatus Use the 1 4 20 threaded connector located on the bottom of the sensor box to secure the Pressure Sensor to an experimental apparatus Figure 4 The alignment hole fits over an alignment pin included on some PASCO apparatuses alignment hole 1 4 20 threaded connector Figure 4 Mounting connector and alignment hole Pressure Sensor Absolute 0 to 700 kPa Suggested Experiments Boyle s Law pressure vs volume Boyle s Law is a classic experiment in physics and chemistry that can be demonstrated using the sensor and the syringe Set the syringe to a position such as 15 cc Connect the syringe to the pressure port connector on the sensor Take data as you change the volume beginning with a volume that is greater than your beginning volume e g move the syringe to 20 cc Continue to take data as you decrease the volume to 15 cc and below Gay Lussac s Law pressure vs absolute temperature Gay Lussac s Law states that if the volume remains constant the pressure of a container of gas is directly proportional to its absolute temperature Set up a sealed container of air by attaching the longer piece of plastic tubing to a stopper in a 125 mL Erlenmeyer flask Connect the other end of the tube to the pressure port connector Place the flask in water baths of different temperatures Record data on how the pressure changes with the temperature changes P
6. ressure in Liquids Put the end of the longer piece of tubing under water The pressure reading should increase by 0 0978 kPa 0 02896 in of mercury per centimeter of depth below the surface You can also use a J shaped tube to study how pressure relates to the difference in heights of the liquid in the two parts of the tube Studying Chemical Reactions by Monitoring Pressure Many chemical reactions produce gases that can cause an increase in pressure in a sealed container The pressure change can be used to monitor the rate of the reaction 012 06859B Other PASCO scientific also produces a Differential Pressure Sensor Model CI 6533 and a Barometer Model CI 6531 The Differential Pressure Sensor is similar to the CI 6532A except that both ports of the transducer are open to the atmosphere It is designed for experiments where pressure differs from one part of the apparatus to another such as in a Venturi tube or for a demonstration of Bernoulli s principle The Barometer has a range from 800 to 1100 milliBar 24 to 32 inches of mercury It is designed to be a reliable accurate pressure sensor for weather studies It is temperature compensated and has a voltage regulator so changes in temperature or changes in the computer s power supply will not interfere with the data PASC Ce scientific 012 06859B Note This instruction sheet was written assuming that the user has a basic familiarity with Science
7. rethane tubing 640 023 quick release connector 640 021 1998 PASCO scientific ZAS C CR crentific 10101 Foothills Blvd Roseville CA 95747 7100 Phone 916 786 3800 FAX 916 786 8905 www pasco com Pressure Sensor Absolute 0 to 700 kPa Table 1 Pressure range comparison 012 06859B 700 00 207 25 5250 4 6 999 101 48 6 908 101 32 30 00 760 0 1 013 14 69 1 000 Range and Resolution The range of the CI 6532A Absolute Pressure Sensor is between 0 and 700 kiloPascals or 0 to 6 9 atmospheres Atmospheric pressure is normally around 101 326 kiloPascals kPa Pressure can be measured in many different units e g atmospheres inches of mercury millimeters of mercury kiloPascals Bar pounds per square inch Some equivalent values for pressure are 1 atmosphere 30 00 in of Hg at 16 C 760 millimeters of Hg 101 326 kiloPascals kPa 1 013 Bar 1013 milliBar 14 696 pounds per square inch psi The top of the range of pressure expressed in these equivalent units is as in Table 1 The maximum short term pressure that the sensor can tolerate without permanent damage is about 1 000 kPa 150 psi Please be careful to not apply high pressure to the sensor The output voltage from the sensor is 1 00 Volts when the pressure is 100 kiloPascals kPa and the output voltage is linear Therefore the output voltage should be 7 00 Volts at the top of the range 700 kPa The resolution o
8. scientific Address PASCO scientific 10101 Foothills Blvd Roseville CA 95747 7100 Phone 916 786 3800 FAX 916 786 8905 email techsupp pasco com web WWwW pasco comMm Pressure Sensor Absolute 0 to 700 kPa 012 06859B 6 PASC CH scientific
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