2
7. Slide the cap onto the electrode body, and then screw the cap onto the
storage bottle so the tip of the electrode is not touching the sponge.
Important:
Do not fully submerge the sensor. The BNC connection is not
waterproof.
Important:
Do not leave the ISE soaking for more than 24 hours.
Note:
If the ISE needs to be transported to the field during the soaking process,
use the Short-Term ISE Soaking Bottle. Remove the cap from the bottle and fill
it 3/4 full with High Standard. Slide the bottle’s cap onto the ISE, insert it into
the bottle, and tighten it. For long-term storage, greater than 24 hours, make sure
the sensor is stored in its storage bottle with the sponge slightly damp.
Channels
Go Direct Ammonium Ion-Selective Electrode has six sensor channels. The
channel names are
l
Potential (mV)
l
Chloride (mg/L)
l
Ammonium (mg/L)
l
Calcium (mg/L)
l
Nitrate (mg/L)
l
Potassium (mg/L)
Note:
The Ammonium 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 amplifier.
Calibrating the Sensor
A calibration is stored on each sensor before it is shipped. As the membrane
ages, this factory calibration may become inadequate. For best results, we
recommend performing a two-point calibration.
Powering the Sensor
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.
Connecting the Sensor
See the following link for up-to-date connection information:
www.vernier.com/start/gdx-nh4
Connected and charging
Blue and Green LED solid when sensor is con-
nected to Graphical Analysis via USB and unit
is charging. (Green LED is obscured by the blue
one.)
Connected, fully charged
Green LED 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.
Identifying the Sensor
When two or more sensors are connected, the sensors can be identified by
tapping or clicking Identify in Sensor Information.
Using the Product
1. Remove the storage bottle from the electrode by unscrewing the lid and
removing the bottle and lid.
2. Thoroughly rinse the lower section of the probe using distilled or deionized
water.
3. Soak the tip of the electrode for 30 minutes in the High Standard solution.
l
The ISE should not rest on the bottom of the container.
l
The small white reference contacts near the tip of the electrode should be
immersed.
l
Make sure no air bubbles are trapped below the ISE.
4. Connect the sensor following the steps in the Getting Started section.
5. For best results, perform a two-point calibration using the High and Low
Standard solutions. For calibration instructions, see
www.vernier.com/til/4011
6. When you are finished making measurements, rinse the electrode with
distilled water.
