2
Do not leave the electrode in acids or bases with concentrations greater than
1.0 M for periods longer than 5 minutes. See
for
other types of pH electrodes.
By default, the units displayed will be in pH. See
to
change the displayed units.
Calibrating the Sensor
For many experiments, calibrating the Go Direct Tris-Compatible Flat pH Sensor
is not required. A calibration equation is stored on each pH Sensor before it is
shipped, which is used as a default by Vernier software.
For the most accurate measurements with this sensor, we recommend calibration.
It is a simple process that takes only a few minutes. For additional calibration
information, see
To calibrate the sensor in Graphical Analysis, complete the following steps.
1. Click or tap the sensor meter to view sensor options.
2. Select Calibrate and follow the applicable prompts on the Calibrate Sensor
screen.
In order to calibrate a pH Sensor, or to confirm that a saved pH calibration is
accurate, you should have a supply of pH buffer solutions that cover the range
of the pH values you will be measuring. For more information about pH buffer
solutions, including recipes for preparation, see
Once you have calibrated your Go Direct Tris-Compatible Flat pH 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.
To restore factory defaults in Graphical Analysis, complete the following steps.
1. Click or tap the live readouts meter and choose Calibrate.
2. Click or tap Reset Calibration.
3. A window will appear warning you that you are about to reset the
calibration. Choose Reset Calibration.
Specifications
Type
Double-junction, sealed, gel-filled, polycarbonate
body, Ag/AgCl reference
Response time
90% of final reading in 1 second in a buffer
Temperature range
5 to 80°C (readings not compensated)
Range
pH 0–14
Typical accuracy (factory
calibration)
± 0.2 pH units
Isopotential pH
pH 7 (point at which temperature has no effect)
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:
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, especially around the bulb
shaped tip, using distilled or deionized water.
3. Connect the sensor following the steps in the Getting Started section of this
user manual.
4. When you are finished making measurements, rinse the electrode with
distilled water.
5. Slide the cap onto the electrode body, and then screw the cap onto the
storage bottle so the tip of the electrode is immersed in the storage solution.
Important:
Do not fully submerge the sensor. The BNC connection is not
waterproof.