Nitrate Ion-Selective Electrode Troubleshooting and FAQs

Nitrate Ion-Selective Electrode, order code NO3-BTA, $179
Specifications and User Guide

TROUBLESHOOTING
-Primary Test: Check the raw voltages while calibrating in the standards. The high (100 mg/L) should be around 1.6 volts. The low (1 mg/L) should be around 2.4 volts.
-Secondary Test: Refer to TIL 665: General tips for using Ion Selective Electrodes (ISE).

RELATED TIL ENTRIES
-TIL 1060: Do any of your sensors require special storage?
-TIL 759: Do you sell ISE Standards?
-TIL 665: General tips for using Ion Selective Electrodes (ISE).
-TIL 1296: How can I have my ISE read mV output instead of mg/L?
-TIL 1895: What Vernier sensors are GLOBE certified?

SPECIFICATIONS
-new order code: NO3-BTA
-old order code: NO3-DIN
-Range: 0.10 to 14,000 mg/L or ppm (7 X 10-6 M to 1.0 M)
-Resolution, 12-bit, (LabPro, Go! Link,ULI II, or Serial Box Interface): (% of reading, low scale reading, high scale reading): 0.7% of reading (0.10 ±0.0007 or 14,000 ±98 mg/L)
-pH Range: 2.5 to 11
-Interfering Ions: ClO4-, I-, ClO3-, CN-, BF4-
-Electrode Slope: –56 mV/decade
-Approximate Calibration Voltages: High(100 mg/L)1.6, Low (1 mg/L) 2.4 V
-Electrode Resistance: 1 to 4 MΩ
-Reproducibility: ± 5% of reading
Temperature range (can be placed in): 0 to 50°C (no temperature compensation)
Minimum immersion: 1 inch
Electrode Length: 155 mm
Body Diameter: 12 mm
Cap Diameter: 16 mm
Cable Length: 100 cm

CALIBRATION
-Calibrate? Yes. Conduct a two-point calibration, using the standard solutions that are shipped with the sensor. First point: the ISE should be soaking in the High Standard. Enter the concentration value of the High Standard. Second point: remove the ISE from the High Standard, rinse well with distilled water from a wash bottle, and gently blot dry with a paper towel or lab wipe. Place the electrode into the Low Standard. Enter the concentration value of the Low Standard.
-Important: Make sure the ISE is not resting on the bottom of the container, and that the small white reference contacts are immersed. Make sure no air bubbles are trapped below the ISE. Hold the ISE still and wait for the voltage reading to stabilize.

RELATED VERNIER PRODUCTS
-ISE Nitrate Replacement Module, Nitrate Replacement Module, order code NO3-MOD, $59
-ISE Nitrate Low Standard, Standard Low NO3 ISE Solution, order code NO3-LST, $16
-ISE Nitrate High Standard, Standard High NO3 ISE Solution, order code NO3-HST, $16