Ammonium – YSI 6000UPG User Manual
Page 60
4-11
ORP readings. After no changes occur for approximately 30 seconds, press Enter to confirm the
calibration. Then, as instructed, press any key to return to the Calibrate menu.
On selecting this option, you will by given the choice of 1-point, 2-point, or 3-point calibrations.
Select the 1-point option only if you are adjusting a previous calibration. If a 2-point or 3-point
calibration has been performed previously, you can adjust the calibration by carrying out a one
point calibration. Immerse the sonde in a buffer of known pH value and press Enter. You will be
prompted to type in the pH value of the solution you are using. Press Enter again, and the screen
will display real-time readings which will allow you to determine when the pH readings have
stabilized. Pressing Enter will confirm the calibration. Then, as instructed, press any key to return
to the Calibrate menu.
Select the 2-point option to calibrate the pH probe using only two calibration standards. In this
procedure, the pH sensor is calibrated using a pH 7 buffer and one additional buffer. A two point
calibration procedure (as opposed to a 3-point procedure) can save time if the pH of the media
being monitored is known to be either basic or acidic. For example, if the pH of a pond is known to
vary between 5.5 and 7, a two point calibration with pH 7 and pH 4 buffers is appropriate. Three
point calibration with an additional pH 10 buffer will not increase the accuracy of this measurement
since the pH is not within this higher range. Be certain that the buffer and sensor are thermally
equilibrated prior to entering pH values.
To begin the calibration, immerse the sonde in pH 7 buffer, as instructed, and press Enter. The
screen will display real-time readings which will allow you to determine when the pH readings have
stabilized. Pressing Enter will confirm the calibration. Following the instructions on the screen,
place the sonde in the second pH buffer, input the pH value, press Enter, and view the stabilization
of the values on the screen in real time. After the readings have stabilized, press Enter to confirm
the calibration. Then, as instructed, press any key to return to the Calibrate menu.
Select the 3-point option to calibrate the pH probe using three calibration solutions. In this
procedure, the pH sensor is calibrated with a pH 7 buffer and two additional buffers. The 3 point
calibration method should be used to assure maximum accuracy when the pH of the media to be
monitored cannot be anticipated. The procedure for this calibration is the same as for a 2 point
calibration, but the software will prompt you to select a third pH buffer to complete the 3 point
procedure. Be certain that the buffer and sensor are thermally equilibrated prior to proceeding with
the calibration.
On selecting this option, you will by given the choice of 1-point, 2-point, or 3-point calibrations for
your ammonium (NH
4
+
) sensor.
Select the 1-point option only if you are adjusting a previous calibration. If a 2-point or 3-point
calibration has been performed previously, you can adjust the calibration by doing a one point
calibration. Immerse the sonde in any solution of known ammonium concentration and press
6.
pH
7.
Ammonium