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1 ph Probe
2 Uses Whether you re monitoring ph for chemistry, physical science, life science, or earth science activity, this ph meter offers accurate readings in a convenient format. Use the RED ph Probe to collect data for: ph of solutions general solution preparation study of biological buffers soil analysis water analysis Common National and State Standards That Can Be Taught With This Data Collector Describing and measuring properties of matter Identification of acids and bases Investigating and measuring changes in or stability of states of matter Characteristics and relationship among air, water, and land Atmosphere Weather Ecosystems NOTE: This product is to be used for educational purposes only. It is not intended for medical, industrial, or mercial applications. 2
3 General Procedures Collect Data in 3 Easy Steps Turn the collector on, it s ready to use right out of the box. Use touch screen mands to select desired parameters. Insert the USB drive and press Play and Record. Analyze Data in 3 Easy Steps Remove USB from data collector unit. Place USB drive in your puter. Open the.csv file in your program of choice. About Plug-in/Excel: RED Chart Add In V 1.00 is patible with Windows from XP to 7 and Excel from 2003 to 2007 Mac OS X to 10.7 and Excel for Mac from 2004 to 2011 RED Chart Add In installer can be found in the RED USB thumb drive included in the package and on the. website. To install please click on the executable file and follow the installation wizard instructions. 3
4 Unique Features/Options: Removable Sensor Tip The ph Probe has a removable sensor tip for easy proper storage. The tip can be stored in an upright manner by removing the sensor tip for the sensor hub, and then stored upright in a beaker or other vessel that will keep the probe from tipping. Help Screen and Error Code Identification Screen The RED USB contains a Help screen file as well as an Error Code Identification Screen. To Access the Error Code Identification Screen: These screens will assist the user in identifying the error codes that may appear on the main screen. Press the? on the top of the main screen. The error codes will appear. By pressing the top or bottom of the screen, the user will be able to either advance the Error Code Identification Screen page or return to the previous Error Code Identification Screen page If an error code does appear, refer to the RED User Manual for Corrective Actions to follow. To Access The Help Screen File: These screens will assist the user with the General Operation and identify the functions of the icons used on the RED probe Insert the included RED USB into the USB port on the RED Data Collector. Press the? on the top of the main screen. The Help Screen will appear. By pressing the top or bottom of the screen, the user will be able to either advance the Help Screen page or return to the previous Help Screen page. 4
5 Specifications ph Measuring System Range: ph 0 to 14 ph Accuracy: ±0.2 ph Resolution: 0.01 ph How The Probe Actually Works: 1.A ph electrode: an electrode whose output voltage changes as the ph (hydrogen ion concentration) changes. 2.A reference electrode: an electrode whose voltage output stays constant. 3.A ph meter: a mv meter with a special high impedance input circuit and circuits to change the electrode's millivolts into ph unit readouts. How Does a ph Electrode Work? Special position glass senses H+ and a millivoltage is generated (59.2 mv per ph unit at 25 C). A filling solution picks up the signal from the special ph glass. A pure silver wire dipped in silver chloride passes the signal from the solution whose ph is being measured to the electrode s cable or connector. 5
6 How Does A Reference Electrode Work? A porous reference junction separates the filling solution in the electrode from the solution whose ph is to be measured. The filling solution s constant chloride ion concentration generates a millivoltage at a pure silver wire with silver chloride on it. The silver wire passes the signal from the solution being measured to the electrode s cable or connector. Calibration Instructions Each probe model has a predefined set of calibration values. No Additional Calibration is Generally Needed before any measurements are taken. User can modify each of these values by feeding the probe with a reference quantity and inserting the correct measure. The save function will store the value in flash memory and allow the user to feed the probe with the next quantity and store the next value. The cancel function will abort the calibration procedure. 6
7 ph Meter Calibration: NOTE: ALWAYS RINSE THE PROBE WITH DI WATER IN BETWEEN EACH MEASUREMENT. 1.ALWAYS start with ph 7 buffer as the first calibration buffer. 2.Use fresh (< 1 week), room temperature buffers. They are stored in the refrigerator and should be taken out in time to reach room temperature. 3.Ideally the buffers should be stirred using a stir plate and magnetic stirrer while they are being measured for calibration. Otherwise enough time should be allowed to stabilize the measure (up to 120 sec.) 4.Use the two buffers that bracket the expected range of measurements. For example, if your samples are expected to be acidic, use the ph 7 and ph 4 buffers to calibrate. If they are expected to be basic use the ph 7 and ph 10 buffers. 5.Rinse the electrode and place into the first buffer (ph 7). 6.Press to enter the calibration setup. Press or + to adjust the calibration point to the value of the used standard. Allow enough time to stabilize the reading (not shown). Press the green check icon to set the value. 7.Rinse the electrode and place into the second buffer. Press or + to adjust the calibration point to the value of the used standard. Press the green check icon to set the value. Save/Abort calibration values 8.Rinse the electrode and place into sample to be measured. 7
8 TM Maintenance and Storage Be cautious when using RED Probeware in wet environments. When placed in boiling water, the probe could collect condensation around the sensor head resulting in damage to the sensor electronics. Proper ph electrode storage will maximize electrode performance and extends electrode life. ph glass electrodes need to be kept moist at all times. Fill the protection cap with the KCl storage solution. Should a ready-to-use storage solution not be available, it can be prepared dissolving 1 gram of potassium chloride (KCl) per 200ml of either the phosphate buffer 4 or 7. Warranty Info: Full 3-year warranty on all RED Data Collectors For further support you can download the full user s manual at. This device plies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received including interference that may cause undesired operation. Exclusively Distributed by: Natural Science wardsci In Canada: wardsci.ca sciencekit In Canada: Boreal/Northwest boreal sargentwelch In Canada: sargentwelch.ca
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