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Table of Contents
Related Manuals for Thermo Scientific 9101BN
Summary of Contents for Thermo Scientific 9101BN
- Page 1 User Guide Refillable Ag/AgCl pH Electrodes...
- Page 3 Introduction This user guide contains information on the preparation, operation and maintenance of the Thermo Scientific Orion refillable Ag/AgCl (silver/silver chloride) pH electrodes. All refillable Ag/AgCl pH electrodes have a pH range of 0 to 14 and silver/silver chloride reference system. Refillable Ag/AgCl electrodes have a pH precision of 0.02 or 0.01.
- Page 4 Cat. No. Description 90BN / Ag/AgCl pH half-cell electrode with glass 90SC body and BNC connector / screw cap connector 90BNWP / Refillable Ag/AgCl combination pH electrode 90SC with glass body and waterproof BNC connector / screw cap connector 903BNWP / Refillable Ag/AgCl combination pH electrode 903SC with glass body, semi-micro tip, and...
- Page 5 Electrodes with a waterproof BNC connector can be used on any pH meter with a BNC connection. • The 9101BN / 9101SC and 9161BN / 9161SC pH half-cell electrodes can be used with the 900100 single junction reference electrode or 900200 double junction reference electrode.
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Page 6: Required Equipment
Required Equipment Thermo Scientific Orion pH meter, such as the 3-Star pH meter, 4-Star pH/ISE meter, 4-Star pH/DO meter, 4-Star pH/ conductivity meter or 5-Star pH/ISE/DO/conductivity meter. Refillable Ag/AgCl pH electrodes can be used on any pH meter with a BNC or U.S. standard connection. The electrodes can also be used on meters with a variety of inputs when an adapter cable is used. -
Page 7: Sample Requirements
Sample Requirements Electrodes with an epoxy body should only be used in aqueous solutions. Electrodes with a glass body may be used in non-aqueous solutions and solutions that contain organic solvents. A minimum of 20% water must be present in the sample for the best measurement results. -
Page 8: Electrode Preparation
Electrode Preparation Electrode Preparation for Non-Sure-Flow Models ® Remove the protective shipping cap from the sensing element and save the cap for storage. Clean any salt deposits from the exterior of the electrode by rinsing with distilled water. Uncover the filling hole by removing the tape and then add electrode filling solution, Cat. - Page 9 Electrode Preparation for Sure-Flow Models ® Remove the protective shipping cap from the sensing element and save the cap for storage. Clean any salt deposits from the exterior of the electrode by rinsing with distilled water. Uncover the filling hole by removing the tape and then add electrode filling solution, Cat.
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Page 10: Measuring Hints
Measuring Hints • Always use fresh buffers for calibration. Choose buffers that are one to three pH units apart. • Check the electrode slope daily by performing a two buffer calibration. The slope should be 92 to 102%. • Remove the filling hole cover during measurements to ensure a uniform flow of filling solution. - Page 11 Filling hole should Filling solution level be uncovered must be higher than sample level Reference junction must be immersed Fresh pH buffer Place insulation between stirrer Stir all samples and beaker and buffers Measuring Hints Using a Flat Surface Electrode Refillable Ag/AgCl pH Electrode User Guide...
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Page 12: Electrode Calibration
Electrode Calibration General Calibration Procedure For detailed instructions on pH calibration, manual pH calibration and temperature compensation, consult your meter user guide. When using PerpHecT electrodes with a PerpHecT pH meter, refer to the PerpHecT meter user guide for instructions on temperature calibration and LogR temperature compensated pH measurements. - Page 13 Two Buffer Calibration This procedure is recommended for precise measurements. Select two buffers that bracket the expected sample pH. The first buffer should be near the electrode isopotential point (pH 7) and the second should be near the expected sample pH (pH 4 or pH 10). The buffers should be at same temperature as the sample.
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Page 14: Electrode Storage
pH Measurement Calibrate the electrode as described in the Electrode Calibration section. Rinse the electrode with distilled water and then with the sample. Place the electrode into the sample. When the reading is stable, record the pH and temperature of the sample. Electrode Storage To ensure a quick response and free-flowing junction, the sensing element and reference junction must not dry out. -
Page 15: Electrode Cleaning Procedures
Electrode Cleaning Procedures General Cleaning Soak the electrode in 0.1 M HCl or HNO for half an hour. The electrode can also be soaked for 15 minutes in a 1:10 dilution of household laundry bleach or a 0.1 to 0.5% liquid detergent solution mixed with hot water. -
Page 16: Electrode Characteristics
Buffer values at different temperatures are given in Table 1. Thermo Scientific Orion pH meters automatically calibrate with the correct pH buffer values based on the measured temperature. All pH meters are unable to correct pH values back to a reference temperature because every sample has a unique pH value vs. - Page 17 Temperature Sensor Errors When a pH and temperature probe are placed into a sample that varies significantly in temperature, the readings can drift for two reasons. First, the temperature response of the electrode and temperature probe may not be similar, which prolongs equilibration and drift.
- Page 18 PerpHecT Electrode Operation with ® PerpHecT pH Meters ® When PerpHecT electrodes are used with a PerpHecT pH meter, enhanced temperature compensation is achieved without the need of a separate ATC probe. Using LogR technology, the temperature of the solution is measured through the resistance of the pH electrode.
- Page 19 Interferences Sodium ions are the principal interference of the pH electrode and cause increasing error at higher pH (lower hydrogen ion activities) and at higher temperatures. Because the pH membrane is composed of special low sodium error glass, error due to sodium is negligible when measuring at pH values less than 12.
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Page 20: Troubleshooting
Meter The meter is the easiest component to eliminate as a possible cause of error. Thermo Scientific Orion pH meters include an instrument checkout procedure and shorting cap for convenience in troubleshooting. Consult the pH meter user guide for directions. -
Page 21: Warranty
Sample/Application The electrode and meter may operate with buffers, but not with the sample. In this case, check the sample composition for interferences, incompatibilities or temperature effects. Refer to the Interferences section. Technique If trouble persists, review operating procedures. Review calibration and measurement sections to be sure proper technique has been followed. -
Page 22: Ordering Information
Ordering Information Electrodes Refer to the Introduction section for a complete list of refillable Ag/AgCl pH electrodes. Accessories Cat. No. Description Ag/AgCl filling solution, 5 x 60 mL bottles 900011 pH electrode storage solution, 475 mL bottle 910001 pH cleaning solution kit, includes 1 x 15 mL 900020 bottle each of cleaning solutions A, B, C and D;... - Page 23 Thermo Fisher Scientific Environmental Instruments Water Analysis Instruments 166 Cummings Center Beverly, MA 01915 USA Tel: 978-232-6000 Toll Free: 800-225-1480 Dom. Fax: 978-232-6015 Int’l. Fax: 978-232-6031 www.thermo.com/water 254788-001 Rev.A...