Vernier Software and Technology
Vernier Software & Technology
Tech Info Library

What is the difference between the Go Direct Electrode Amplifier (GDX-EA) and the Go Direct ISE Amplifier (GDX-ISEA)?

Go Direct® Electrode Amplifier, order code GDX-EA, $64 is the amplifier that comes as part of:
      Go Direct® pH Sensor, order code GDX-PH, $89
      Go Direct® Tris-Compatible Flat pH , order code GDX-FPH, $109
      Go Direct® Glass-Body pH Sensor, order code GDX-GPH, $139
      Go Direct® ORP Sensor, order code GDX-ORP, $99
It has two measurement channels: pH and Potential (mV) and is shipped with the appropriate channel set as the default. It can also be purchased separately, in which case it is set to Potential (mV).

Go Direct® Ion-Selective Electrode Amplifier, order code GDX-ISEA, $69 is the amplifier that comes as part of:
      Go Direct® Chloride Ion-Selective Electrode, order code GDX-CL, $249
      Go Direct® Calcium Ion-Selective Electrode, order code GDX-CA, $249
      Go Direct® Ammonium Ion-Selective Electrode, order code GDX-NH4, $249
      Go Direct® Nitrate Ion-Selective Electrode, order code GDX-NO3, $249
      Go Direct® Potassium Ion-Selective Electrode, order code GDX-K, $249
It has six measurement channels: Chloride (mg/L), Calcium (mg/L), Ammonium (mg/L), Nitrate (mg/L), Potassium (mg/L), and Potential (mV), and is shipped with the appropriate channel set as the default. It can also be purchased separately, in which case it is set to Potential (mV).

Note that for both of these amplifiers, the selected channel must match the attached electrode. For example, changing the ISE Amplifier to the Nitrate (mg/L) channel will not actually measure nitrate concentration unless there is a Go Direct® Nitrate Ion-Selective Electrode BNC, order code GDX-NO3-BNC, $196 attached.

If you wish to purchase other electrodes and change the channels of your amplifier to match, see TIL 3984: How do I change the displayed measurement channel on my Go Direct Electrode Amplifier or ISE Amplifier?.

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