PASCO Specialty & Mfg. CI-6559 User's Manual
Contents
1. at 0 RH To open the Calibration window double click on the Humidity Sensor icon in the Experiment Setup win dow The other point for calibration is gained by exposing the Humidity Sensor to an atmosphere of known relative humidity When the humidity reading is relatively constant enter the known RH value in the High Value area in the Calibration window and click Take Reading DataStudio or Read ScienceWorkshop Click OK to close the Calibration window Two Point Calibration The two point calibration is more difficult because the sensor must be exposed to two distinctively different atmospheres of different levels of known relative humidities to read high and low values for calibration This difficulty may be overcome by using a device known as a saturated salt cell A saturated salt cell is an enclosed system containing a saturated salt solution and air The air in the closed system will come to equilibrium at a particular relative humidity The specific RH at which the system comes to equilibrium is based on the ability of the saturated salt solution to extract or add through evaporation water vapor from or to the air This is a common tool for calibration of relative humidity instruments The high and low RH readings should be entered in the Calibration window as explained in the Single Point Calibration section PAS C Ci scientific Constructing a Saturated Salt Cell 1 A one liter glass or plastic2. covered container may be used as a vessel for a cell 2 Place distilled or deionized water approximately one centimeter deep into the vessel 3 Add enough salt to create the desired saturated solution Hint Excess salt should be present visible as it settles to the bottom of the vessel to ensure saturation of the solution A closed cell constructed with NaCl as the excess salt will have a RH of about 75 A similar con structed cell using MgCl will have a RH of about 33 The single point calibration method may also be accomplished with a saturated salt cell When performing the calibration the Humidity Sensor should be placed in the saturated salt cell and allowed to equilibrate This could take as long as 30 minutes or more Mounting on an Experimental Apparatus Use the 1 4 20 screw connector located on the bottom of the sensor box to secure the Humidity Sensor to an experimental apparatus Figure 2 The alignment hole fits over an alignment pin included on some PASCO apparatuses alignment hole 1 4 20 screw connector Figure 2 Mounting connector and alignment hole Humidity Sensor 012 06437B Copyright Warranty and Equipment Return tions below Please Feel free to duplicate this manual subject to the copyright restric Copyright Notice The PASCO scientific 012 06437A instruction sheet is copyrighted and all rights reserved However permis sion
3. is granted to non profit educational institutions for reproduction of any part of the Humidity Sensor instruction sheet providing the reproductions are used only for their laboratories and are not sold for profit Reproduction under any other circumstances without the written consent of PASCO scientific is prohibited 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 cus tomer Equipment must be properly packed to prevent damage and shipped postage or freight prepaid Damage caused by improper packing of the equip ment for return shipment will not be covered by the warranty Shipping costs for returning the equipment after repair will be paid by PASCO scientific Equipment Return Should the product have to be returned to PASCO scientific for any reason notify PASCO scientific by letter phone or fax BEFORE returning the product Upon notification the return authorizat
4. 10 and display the result as relative humidity The Humidity Sensor can be plugged directly into any ScienceWorkshop computer interface or connected to the interface box using the supplied cable with 8 pin DIN connectors Setup Procedure 1 Connect the Humidity Sensor and any analog channel into the PASCO Computer Interface with interface cable Figure 1A or Insert the DIN plug of the Humidity Sensor directly into any analog channel on the PASCO Computer Interface Figure 1B 2 Open the Experiment Setup window in DataStudio or ScienceWorkshop Click and drag the analog plug icon to the analog channel icon that matches the analog port you are using for the Humidity Sensor Plug into any analog channel Plug into any analog channel Figure 1 Connecting the Humidity Sensor into the computer interface 3 Select Humidity Sensor from the Sensors list DataStudio or drop down menu ScienceWorkshop 4 Open a display window such as the graph display In DataStudio doubleclick the graph icon in the display list In ScienceWorkshop drag and drop the graph icon over the Humidity Sensor icon 5 Additional display windows can be opened by fol lowing the procedure in step 4 Operational Notes To prevent damage to the Humidity Sensor or other equipment do not immerse the Humidity Sensor in fluid The sensing element resists contamination vapors such as organic solvents chlori
5. Instruction Sheet for the PASCO Model ClI 6559 012 06437B 11 99 1 00 HUMIDITY SENSOR vented top Humidity Sensor aperture for sensing element plate DIN connector to computer interface Oe interface cable with DIN connectors Introduction The PASCO CI 6559 Humidity Sensor is designed to be used with the PASCO ScienceWorkshop computer interface and DataStudio or ScienceWorkshop soft ware The Humidity Sensor may be used for making single readings or continuous monitoring of relative humidity RH Equipment Included e CI 6559 Humidity Sensor e 6 foot cable with 8 pin DIN connectors e instruction sheet e storage bag Additional Equipment Required e Any PASCO ScienceWorkshop computer interface e PASCO DataStudio software Or PASCO ScienceWorkshop software version 2 2 5 or higher Specifications Range 0 100 RH Accuracy no calibration 5 RH at 60 RH 8 at 90 RH with saturated salt calibration 2 0 100 25 C Resolution 0 1 RH Response Rate 15 seconds in slow moving air Repeatability 0 5 RH Connector Type 8 pin DIN ScienceWorkshop interface compatible Voltage Output 0 10V 0 100 RH DIN Connector 1 analog output 0 10 V 2 analog output signal ground 3 no connection 4 5 VDC power 5 power ground 6 12 VDC power 7 12 VDC power 8 no connection 1997 PASCO scientific Author Stev
6. e Miller BD f amp oTo 10101 Foothills Blvd P O Box 619011 Roseville CA 95678 9011 USA Phone 916 786 3800 FAX 916 786 8905 email techsupp PASCO com scientific Humidity Sensor 012 06437B Theory The Humidity Sensor consists of two basic elements the humidity sensing element and the signal condition amplifier The humidity sensing element is powered by 5 volts DC and outputs a DC voltage that is proportional to the relative humidity of the air surrounding the sens ing element The element is an integrated circuit which features high reliability and fast response and is contamination resistant The output voltage of the sensing element varies between 0 8 and 3 9 VDC which corresponds to a relative humidity ranging from 0 to 100 respectively Two stages of amplification are provided to condition the signal from the humidity sensing element for input to the ScienceWorkshop computer interface The output of these two stages will range from 0 to 10 VDC which will correspond to 0 to 100 humidity The first stage is used to reference the sensor output range from 0 to 3 1 volts This establishes 0 volts as the 0 relative humidity point The second stage applies a gain of about 3 2 which causes the maxi mum sensor output 3 1VDC to increase to 1OVDC which corresponds to a 100 relative humidity Both DataStudio and ScienceWorkshop software take the 0 10V output from the sensor multiply it by
7. ion and shipping instructions will be promptly issued gt NOTE NO EQUIPMENT WILL BE ACCEPTED FOR RETURN WITHOUT AN AUTHORIZATION FROM PASCO When returning equipment for repair the units must be packed properly Carriers will not accept responsi bility for damage caused by improper packing To be certain the unit will not be damaged in shipment observe the following rules The packing carton must be strong enough for the item shipped Make certain there are at least two inches of packing material between any point on the appara tus and the inside walls of the carton Make certain that the packing material can not shift in the box or become compressed allowing the instrument to come in contact with the edge of the packing carton Address PASCO scientific 10101 Foothills Blvd P O Box 619011 Roseville CA 95678 9011 Phone 916 786 3800 FAX 916 786 8905 email techsupp pasco com PASC Ce scientific
8. ne and ammonia The element is also unaffected by water condensation For best results The Humidity Sensor is capable of responding fairly quickly to changes in the humidity However in order to respond a sample of the environment air must reach the sensing element positioned near the sensor aperture The sensor responds quickest when it is in a slow moving air stream This may be accomplished by moving the sensor slowly with your hand during data collection To avoid errors The sensing element can be affected by the bright light of the sun Do not point the aperture for the sensing element directly toward the sun or a bright light PASC Ce scientific 012 06437B Humidity Sensor Calibration of the Humidity Sensor For most applications calibration of the Humidity Sensor is not required If the sensor is to be calibrated with DataStudio or ScienceWorkshop one of two methods may be used 1 single point calibration method or 2 two point calibration method Each method is described in detail in the DataStudio online help manual and the ScienceWorkshop software user manual Use of either method requires that the sensor be exposed to a sample of known relative humidity Single Point Calibration The single point calibration method is fairly easy to implement The single point calibration is a two point calibration see below where the output of the Humidity Sensor is assumed to be 0 volts
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