• Go Direct ISE Amplifier
• Micro USB Cable

Choose a platform below to see its compatibility requirements.

LabQuest

Interface	LabQuest App
LabQuest 3	Full support 1
LabQuest 2 (discontinued)	Full support 1 2
LabQuest (discontinued)	Incompatible

Compatibility Notes

1. Requires a BNC electrode
2. Wireless connection of this sensor to a LabQuest 2 requires a Go Direct Bluetooth Adapter when used with some older LabQuest 2 models.

Computers

	Software
Interface	Graphical Analysis
No interface required	Full support 1 2
LabQuest 3	Full support 1 3
LabQuest 2 (discontinued)	Full support 1 3 4

Compatibility Notes

1. Requires a BNC electrode
2. For Bluetooth^® connectivity, only computers running Windows 10 or Mac OS X 10.10 or newer are supported. The computer must also have a compatible Bluetooth 4.0⁺ radio.
3. Connect this sensor directly to a computer or Chromebook via a USB or wireless Bluetooth^® connection for best results. Alternatively, this sensor is fully supported when used with LabQuest 2 or LabQuest 3 when the LabQuest is connected to a computer or Chromebook via Wireless Data Sharing.
4. Wireless connection of this sensor to a LabQuest 2 requires a Go Direct Bluetooth Adapter when used with some older LabQuest 2 models.

Chromebook

	Software
Interface	Graphical Analysis
No interface required	Full support 1
LabQuest 3	Full support 1 2
LabQuest 2 (discontinued)	Full support 1 2 3

Compatibility Notes

1. Requires a BNC electrode
2. Connect this sensor directly to a computer or Chromebook via a USB or wireless Bluetooth^® connection for best results. Alternatively, this sensor is fully supported when used with LabQuest 2 or LabQuest 3 when the LabQuest is connected to a computer or Chromebook via Wireless Data Sharing.
3. Wireless connection of this sensor to a LabQuest 2 requires a Go Direct Bluetooth Adapter when used with some older LabQuest 2 models.

iOS

	Software
Interface	Graphical Analysis	Graphical Analysis GW
No interface required	Full support 1	Full support 1
LabQuest 3	Full support 1 2 3	Full support 1 2 3
LabQuest 2 (discontinued)	Full support 1 2 3 4	Full support 1 2 3 4

Compatibility Notes

1. Requires a BNC electrode
2. Connect this sensor directly to a supported mobile device via a wireless Bluetooth^® connection for best results.
3. iOS and Android^™ devices can only connect to LabQuest 2 or LabQuest 3 via Wireless Data Sharing.
4. Wireless connection of this sensor to a LabQuest 2 requires a Go Direct Bluetooth Adapter when used with some older LabQuest 2 models.

Android

	Software
Interface	Graphical Analysis	Graphical Analysis GW
No interface required	Full support 1	Incompatible 1
LabQuest 3	Full support 2 3	Full support 1 2
LabQuest 2 (discontinued)	Full support 2 3 4	Full support 1 2 4

Compatibility Notes

1. Requires a BNC electrode
2. iOS and Android^™ devices can only connect to LabQuest 2 or LabQuest 3 via Wireless Data Sharing.
3. Connect this sensor directly to a supported mobile device via a wireless Bluetooth^® connection for best results.
4. Wireless connection of this sensor to a LabQuest 2 requires a Go Direct Bluetooth Adapter when used with some older LabQuest 2 models.

Python

	Software
Interface	Python
No interface required	Full support

Javascript

	Software
Interface	Javascript
No interface required	Full support 1

Compatibility Notes

1. A wireless Bluetooth^® connection can be made with Go Direct sensors on any platform running a browser with WebBluetooth support. However, only a few operating systems have been tested and testing has been limited.

LabVIEW

	Software
Interface	NI LabVIEW
No interface required	Full support 1

Compatibility Notes

1. For Bluetooth^® connectivity, only computers running Windows 10 or Mac OS X 10.10 or newer are supported. The computer must also have a compatible Bluetooth 4.0⁺ radio.

Please see the following link for platform-specific connection information:

www.vernier.com/start/gdx-isea

Bluetooth Connection

USB Connection

Install Graphical Analysis 4 on your computer, Chromebook™, or mobile device. See www.vernier.com/ga4 for software availability. Charge your sensor for at least 2 hours before first use. Prepare a BNC ion-selective electrode (not included) by connecting it to the Go Direct ISE Amplifier and soaking it in the High Standard solution for 30 minutes. Refer to the electrode’s manual for more information. Turn on your sensor by pressing the power button once. The Bluetooth® LED will blink red. Launch Graphical Analysis 4. Click or tap Sensor Data Collection. Click or tap your Go Direct sensor from the list of Discovered Wireless Devices. Your sensor's ID is located near the barcode on the sensor. The Bluetooth LED will blink green when it is successfully connected. This is a multi-channel sensor. The active channel is listed in the Connected Devices Sensor Channels list. To change channels, select the check box next to the Sensor Channel(s) you would like to activate. Click or tap Done to enter data-collection mode. For best results, perform a two-point calibration using the High and Low Standard solutions. Refer to the electrode’s manual for more information.

Prepare a BNC ion-selective electrode (not included) by connecting it to the Go Direct ISE Amplifier and soaking it in the High Standard solution for 30 minutes. Refer to the electrode’s manual for more information. Install Graphical Analysis 4 on your computer or Chromebook. If using LabQuest 2, make sure LabQuest App is up to date. See www.vernier.com/ga4 for software availability or www.vernier.com/downloads to update LabQuest App. Connect the sensor to the USB port. Launch Graphical Analysis 4 or turn on LabQuest 2. This is a multi-channel sensor. To change the default channel selections, see www.vernier.com/start/gdx-isea. For best results, perform a two-point calibration using the High and Low Standard solutions. Refer to the electrode’s manual for more information.

Connect the Go Direct ISE Amplifier to the included USB micro cable and any USB device for two hours.

You can also charge up to eight Go Direct ISE Amplifiers using our Go Direct Charge Station, sold separately (order code: GDX-CRG).

Charging	Blue LED is on steady while sensor is connected to the Charging Cable or Charge Station.
Fully charged	Blue LED is off when charging is complete.

Turning on the sensor	Press button once. Red LED indicator flashes when unit is on.
Putting the sensor in sleep mode	Press and hold button for more than three seconds to put into sleep mode. Red LED indicator stops flashing when sleeping.

See the following link for up-to-date connection information:

www.vernier.com/start/gdx-isea

Connecting via Bluetooth

Ready to connect	Red LED flashes when sensor is awake and ready to connect.
Connected	Green LED flashes when sensor is connected via Bluetooth.

Connecting via USB

Connected and charging	Blue and Green LEDs are solid when sensor is connected to Graphical Analysis via USB and unit is charging. (Green LED is obscured by the blue one.)
Connected, fully charged	Green LED is solid when sensor is connected to Graphical Analysis via USB and the unit is fully charged.
Charging via USB, connected via Bluetooth	Blue LED is solid and green LED is flashing, but the green flashing LED looks white because it is overwhelmed by the blue.

Channels

Go Direct ISE Amplifier has six measurement channels:

• Potential (mV)
• Chloride (mg/L)
• Ammonium (mg/L)
• Calcium (mg/L)
• Nitrate (mg/L)
• Potassium (mg/L)

Note: The Potential channel is the default channel for this sensor. All channels are mutually exclusive except Potential (i.e., You can display one concentration channel and Potential at the same time, but you cannot display two concentration channels at the same time). In order to collect data from the other concentration channels, you must also attach the applicable corresponding BNC electrode to the ISE.

If an ion-selective electrode is attached, a two-point calibration is recommended for the most accurate results. For additional calibration information, see www.vernier.com/til/4011

In order to calibrate an ISE electrode/ISE amplifier combination, or to confirm that a saved calibration is accurate, you should have a supply of ISE standard solutions that cover the range of the concentration values you will be measuring. For more information about ISE standard solutions, including recipes for preparation, see www.vernier.com/til/665

Once you have calibrated a Go Direct sensor, the calibration is automatically stored to the sensor and will be used each time you connect to your device. You can always choose to restore factory defaults if you feel the custom calibration is invalid.

If you are measuring potential, calibration is not required. Calibration is disabled in this mode to ensure the best results. For additional calibration information, see www.vernier.com/til/4011

Range	–1000 mV to +1000 mV
Resolution	0.01 mV
USB specification	2.0
Wireless specification	Bluetooth 4.2
Maximum wireless range	30 m
Dimensions	8.5 cm × 3.5 cm × 1.75 cm
Battery	300 mA Li-Poly
Battery life (single full charge)	~24 hours
Battery life (long term)	~500 full charge cycles (several years depending on usage)

Battery Information

Go Direct ISE Amplifier contains a small lithium-ion battery. The system is designed to consume very little power and not put heavy demands on the battery. Although the battery is warranted for one year, the expected battery life should be several years. Replacement batteries are available from Vernier (order code: GDX-BAT-300).

Storage and Maintenance

To store Go Direct ISE Amplifier for extended periods of time, put the device in sleep mode by holding the power button down for at least three seconds. The red LED will stop flashing to show that the unit is in sleep mode. Over several months, the battery will discharge but will not be damaged. After such storage, charge the device for a few hours, and the unit will be ready to go.

Exposing the battery to temperatures over 35°C (95°F) will reduce its lifespan. If possible, store the device in an area that is not exposed to temperature extremes.

Water Resistance

Go Direct ISE Amplifier is not water resistant and should never be immersed in water.

If water gets into the device, immediately power the unit down (press and hold the power button for more than three seconds). Disconnect the sensor and charging cable, and remove the battery. Allow the device to dry thoroughly before attempting to use the device again. Do not attempt to dry using an external heat source.

Go Direct ISE Amplifier is a circuit that allows the voltage output of the electrode to be monitored. Firmware on the amplifier automatically uses the Nernst equation to convert the Potential reading to Concentration when the appropriate sensor channel is connected. The electrode is connected to the BNC connector on one end of the amplifier. Go Direct ISE Amplifier will initially default to report values in units of mV.

For troubleshooting and FAQs, see www.vernier.com/til/665

If you have followed the troubleshooting steps and are still having trouble with your Go Direct ISE Amplifier, contact Vernier Technical Support at support@vernier.com or call 888-837-6437. Support specialists will work with you to determine if the unit needs to be sent in for repair. At that time, a Return Merchandise Authorization (RMA) number will be issued and instructions will be communicated on how to return the unit for repair.

Item	Order Code
Go Direct Potassium Ion-Selective Electrode BNC	GDX-K-BNC
Go Direct Nitrate Ion-Selective Electrode BNC	GDX-NO3-BNC
Go Direct Ammonium Ion-Selective Electrode BNC	GDX-NH4-BNC
Go Direct Chloride Ion-Selective Electrode BNC	GDX-CL-BNC
Go Direct Calcium Ion-Selective Electrode BNC	GDX-CA-BNC
Micro USB Cable	CB-USB-MICRO
Go Direct 300 mAh Replacement Battery	GDX-BAT-300
USB-C to Micro USB Cable	CB-USB-C-MICRO

Vernier warrants this product to be free from defects in materials and workmanship for a period of five years from the date of shipment to the customer. This warranty does not cover damage to the product caused by abuse or improper use. This warranty covers educational institutions only.

When disposing of this electronic product, do not treat it as household waste. Its disposal is subject to regulations that vary by country and region. This item should be given to an applicable collection point for the recycling of electrical and electronic equipment. By ensuring that this product is disposed of correctly, you help prevent potential negative consequences on human health or on the environment. The recycling of materials will help to conserve natural resources. For more detailed information about recycling this product, contact your local city office or your disposal service.

Battery recycling information is available at www.call2recycle.org

Do not puncture or expose the battery to excessive heat or flame.

The symbol, shown here, indicates that this product must not be disposed of in a standard waste container.