Section 1 Product overview The Intellical ISEF121 series probes are digital, combination ion-selective electrodes (ISE) that measure the concentration of fluoride in wastewater, drinking water and general water samples. The probes have a built-in temperature sensor, a non-refillable gel reference and non-replaceable membranes.
Specifications Details Minimum sample volume 25 mL Minimum immersion depth 25.4 mm (1 in.) Body material (standard) Epoxy Sensor material Solid-state LaF crystal Reference electrolyte Non-refillable Dritek gel reference element Cable connection M12 digital output and connector Dimensions Diameter: 12 mm (0.47 in.) Length: 175 mm (6.9 in.) total;...
3.4 Product hazards C A U T I O N Chemical exposure hazard. Obey laboratory safety procedures and wear all of the personal protective equipment appropriate to the chemicals that are handled. Refer to the current safety data sheets (MSDS/SDS) for safety protocols. C A U T I O N Chemical exposure hazard.
5.2 Calibration procedure 1. Go to the 2. Add 25 mL of 3. Add one Fluoride 4. Add a stir bar to calibrate menu. each standard Ionic Strength the first standard Select the probe, if solution to plastic Adjustor (ISA) solution.
Section 6 Sample measurement The procedure that follows is applicable to meters that can connect to Intellical ISE probes. Refer to the applicable meter documentation for meter operation and probe-specific settings. 6.1 Sample measurement notes Read the notes that follow before sample measurements. •...
5. Put the probe in 6. Shake the probe 7. Stir for 30 to the sample with the from side to side to 60 seconds, then sensor fully in the refresh the reference read the fluoride sample. Do not put junction and remove concentration of the the probe on the...
probe response when the level of hydroxide is more than 10% of the level of fluoride. The error increases with an increase in pH and a decrease in fluoride. When the Fluoride ISA is added to standards and samples, the pH is buffered between 5.0 and 5.5, which prevents interference from hydroxide ion.
5. Rinse the probe 6. Put the probe in 7. Shake the probe 8. Stir for 30 to with deionized water. the standard solution from side to side to 60 seconds, then Dry the probe with a with the sensor fully remove air bubbles.
Section 9 Troubleshooting Refer to Table 2 for general troubleshooting information. To check the probe performance, refer to Slope check on page 12. To check the accuracy of sample measurements, refer to Standard additions check on page 12. Table 2 Troubleshooting information Problem Possible cause Solution...
9.1 Slope check Use the mV value of two standard solutions to make sure the probe gives the correct slope. 1. Prepare two standard solutions that are ten times apart in concentration (e.g., 1 mg/L and – 10 mg/L F ).
Section 10 Consumables Note: Product and Article numbers may vary for some selling regions. Contact the appropriate distributor or refer to the company website for contact information. Description Quantity Item no. Fluoride Ionic Strength Adjustor Powder Pillows 100/pkg 258999 Fluoride Ionic Strength Adjustor Solution 3.78 L 2829017 Fluoride Standard Solution, 0.5 mg/L as F...
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