Hach LDO sc Model 2 Sensor Benutzerhandbuch Seite 11

• SC200 and SC1000 Controllers—Go to the main menu, then select SENSOR SETUP > [select
instrument] > CONFIGURE.
2. Select an option.
Option
Name
(or EDIT NAME)
Unit
(or SET UNITS)
Altitude/Pressure
(or ALT/PRESS)
Salinity
(or SALINITY)
Signal average
(or SIGNAL AVERAGE)
Cleaning interval
(or CLEAN INTRVL)
Reset cleaning interval
(or RESET CLN INTRVL)
Data logger interval
(or LOG SETUP)
Reset
(or SET DEFAULTS)
5.2.1 Identify the salinity correction value
Dissolved oxygen measurements in saline samples can show an apparent DO value that is very
different from the actual DO value. To correct for the influence of dissolved salts in a sample, enter a
salinity correction factor.
Note: If the presence or amount of salinity in the process is unknown, consult with the treatment facility engineering
staff.
1. Use a conductivity meter to measure the conductivity of the sample in mS/cm at a reference
temperature of 20 °C (68 °F).
2. Use Table 1 to estimate the salinity correction factor in parts per thousand (‰) saturation.
Note: The chloride ion concentration, in g/kg is equal to the chlorinity of the sample. Salinity is calculated with
the formula: Salinity = 1.80655 × chlorinity.
Description
Changes the name that corresponds to the sensor on the measurement screen.
The name is limited to 16 characters in any combination of letters, numbers,
spaces or punctuation.
Temperature (or TEMPERATURE)—Sets the temperature units to °C (default) or
°F.
Measurement (or MAIN MEASURE)—Sets the measurement units to mg/L, ppm
(default) or %.
Altitude/Pressure (or ALT/PRESS)—Sets the units for atmospheric pressure to
altitude (m or ft) or pressure (mmHg or torr).
Note: Use the Unit (or SET UNITS) option to change the units entered for
Altitude/Pressure (or ALT/PRESS).
Enter the altitude or atmospheric pressure. This value must be accurate to
complete % saturation measurements and calibration in air. Default: 0 ft (sea
level).
Use only absolute pressure, not adjusted. If the absolute air pressure is not
known, enter the altitude. The manufacturer recommends the use of absolute or
actual air pressure as a best practice.
Sets the salinity correction value—0.00 (default) to 250.00 parts per thousand
(‰). Refer to Identify the salinity correction value
Sets a time constant to increase signal stability. The time constant calculates the
average value during a specified time—0 (no average) to 999 seconds (average
of signal value for 999 seconds). Default: 60 seconds.
The Signal average (or SIGNAL AVERAGE) setting increases the time for the
device signal to respond to actual changes in the process.
Sets the interval for the cleaning reminder (default: 0 days).
The Days remaining to clean (or DAYS TO CLEAN) counter is automatically set
to the Cleaning interval (or CLEAN INTRVL) value (e.g., 30 days). The Days
remaining to clean (or DAYS TO CLEAN) counter is shown on the
Diagnostics/Test (or DIAG/TEST) menu.
To disable the reminder, set to 0.
Sets the Days remaining to clean (or DAYS TO CLEAN) counter back to the
Cleaning interval (or CLEAN INTRVL) value.
Sets the time interval for data storage in the data log—30 seconds, 1, 2, 5, 10,
15 (default), 30 or 60 minutes
Sets the sensor settings back to the factory default settings. Does not change the
calibration slope or offset.
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