Hach LBOD101, Руководство пользователя

Страница: 11 / 18

6.3 Low-level measurements
If samples are expected to have less than 1 mg/L O
2
, calibrate the probe with a zero-oxygen solution.
A zero-point calibration is not recommended for samples that have more than 1 mg/L O
2
. Use the
guidelines and steps that follow only when the sample is expected to have less than 1 mg/L O
2
.
• Calibrate the probe with a zero-oxygen solution. Use the "100% with 0" calibration option in the
meter. Measure the 100% value first, then measure the zero-oxygen solution. Refer to Zero-point
calibration procedure on page 7.
• Measure the salinity of the sample and enter the salinity correction factor in the probe settings.
• Wait approximately 10 minutes for the measurement contents to adjust to ambient temperature,
then measure the sample. Measure the sample again to make sure the result is the same.
• Clean the probe regularly. Refer to Clean the probe on page 9.
Section 7 Maintenance
7.1 Clean the probe
N O T I C E
The LBOD sensor cap has a protective black layer to increase the life of the LBOD sensor. Do not
rub the black layer to clean the LBOD sensor cap. Do not use alcohol or other organic solvents to
clean the LBOD sensor cap.
Keep the LBOD sensor cap clean for best results. Use only water and neutral detergents to clean the
probe.
1. Put the probe in a neutral cleaning solution and stir the solution. Do not rub or remove the black
layer on the LBOD sensor cap.
2. Rinse the probe with deionized water. Blot dry with a lint-free cloth.
7.2 Replace the sensor cap and iButton
N O T I C E
Do not use sharp metal tools to remove the LBOD sensor cap.
Replace the LBOD sensor cap after 365 days, or more frequently if the cap becomes damaged or
dirty. The LBOD sensor cap and iButton operate together and must be replaced at the same time.
1. Use fingers to remove the LBOD sensor cap from the probe. Do not touch the probe lens. Refer
to
Figure 2 . Discard the used LBOD sensor cap.
Note: The stirrer assembly can stay installed.
2. If water is between the LBOD sensor cap and the probe lens, or if the probe lens looks dirty, rinse
with dilute isopropyl alcohol (10% or less) or deionized water and blot dry with a non-abrasive
cloth. Do not wipe the probe lens or use abrasive cleaners.
3. Hold the new LBOD sensor cap by the sides and install the new cap on the probe. Refer to
Figure 2 . Make sure the LBOD sensor cap is on tightly.
Note: Do not touch the protective black layer on the LBOD sensor cap.
4. Install the new iButton
®
in the pressure sensor module. Refer to Figure 3 . Make sure that the
label on the iButton is on top when the cap is open. Make sure to fully close the cap.
English 9