Vernier Software and Technology
Vernier Software & Technology
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Go Direct Ammonium Ion-Selective Electrode Troubleshooting and FAQs

Go Direct® Ammonium Ion-Selective Electrode, order code GDX-NH4, $249
Specifications and User Guide

-Primary Test: Check the readings in the standards. The high should be around 100 mg/L. The low should be around 1 mg/L.
-Secondary Test: Refer to TIL 665: General tips for using Ion Selective Electrodes (ISE).

-TIL 4011: How do I calibrate my sensor?
-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 3389: How do I sterilize an Ion-Selective Electrode?

-Range: 1 to 18,000 mg/L or ppm
-pH range: 2 to 7 (no pH compensation)
-Interfering ions: K+, Li+, Na+, Cs+, Mg3+, Ca2+, Sr2+, Ba2+
-Electrode slope: +55 +/- 3 mV/decade
-Approximate calibration voltages: High (100 mg/L) 116 mV, Low (1 mg/L) 0 mV
-Electrode resistance: 0.1 to 5 MΩ
-Accuracy: ± 10% of full scale (calibrated 1 to 100 mg/L)
-Temperature range (can be placed in): 0 to 40°C (no temperature compensation)
-Minimum immersion: 1.1 inch
-dimension ISEA: 8.5 cm height x 3 cm wide x 1.75 cm depth
-dimension electrode: 15.5 cm length, 12 mm OD
-shaft diameter: 12mm OD

-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. Stirring the solution during this process is ideal.

-ISE Ammonium Replacement Module, Ammonium Replacement Module, order code NH4-MOD, $79
-ISE Ammonium Low Standard, Standard Low NH4 ISE Solution, order code NH4-LST, $18
-ISE Ammonium High Standard, Standard High NH4 ISE Solution, order code NH4-HST, $18

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