Hach pHD Manual Básico Del Usuario página 12

Figure 4 Sensor in reference solution
2. Wait for the sensor and solution temperature to equalize. This can take 30 minutes or more if the
temperature difference between the process and reference solution is significant.
3. Select the main menu icon, then select Devices. A list of all of the available devices shows.
4. Select the sensor and select Device menu > Calibration.
5. Select the type of calibration:
Option
1-point buffer calibration
(or 1-point auto
correction)
2-point buffer calibration
(or 2-point auto
correction)
1-point value calibration
(or 1-point manual
correction)
2-point value calibration
(or 2-point manual
correction)
6. Select the option for the output signal during calibration:
Option Description
Active The instrument sends the current measured output value during the calibration procedure.
Hold The sensor output value is held at the current measured value during the calibration procedure.
Transfer A preset output value is sent during calibration. Refer to the controller user manual to change the
preset value.
7. With the sensor in the first reference solution, push OK.
The measured value is shown.
8. Wait for the value to stabilize and push OK.
Note: The screen may advance to the next step automatically.
9. If applicable, enter the pH value and push OK.
Note: If the reference solution is a buffer, find the pH value on the buffer bottle for the temperature of the buffer.
If the reference solution is a sample, determine the pH value of the sample with a different instrument.
10. For a 2-point calibration, measure the second reference solution as follows:
a. Remove the sensor from the first solution and rinse with clean water.
b. Put the sensor in the next reference solution, then push OK.
12 English
Description
Use one buffer for calibration (e.g., pH 7). The sensor automatically identifies
the buffer during calibration.
Note: Make sure to select the buffer set in the Calibration > Calibration options
> Select standard buffer menu (or Settings > Select standard buffer menu).
Use two buffers for calibration (e.g., pH 7 and pH 4). The sensor automatically
identifies the buffers during calibration.
Note: Make sure to select the buffer set in the Calibration > Calibration options
> Select standard buffer menu (or Settings > Select standard buffer menu).
Use one sample of a known value (or one buffer) for calibration. Determine the
pH value of the sample with a different instrument. Enter the pH value during
calibration.
Use two samples of known value (or two buffers) for calibration. Determine the
pH value of the samples with a different instrument. Enter the pH values during
calibration.