Hach-Lange SENSION+ MM378 - Manual (Page 12)

Set the calibration reminder
pH: The calibration reminder can be set between 0 to 23 hours or
1-7 days (default 1 day). EC: The calibration reminder can be set
between 0 to 99 days (default 15 days). The display shows the
remaining time to the new calibration.
Note: When 0 days is selected, the calibration reminder is turned off.
1. From the main menu use the or to select CALIBRATION.
Confirm.
2. Use the to enter the calibration menu.
3. Use the or to select Cal. frequency and confirm.
4. Use the and to advance to the next step and use the or to
change a value. Confirm.
Push to start the calibration.
Sample measurements
Each probe has specific preparation steps and procedures for taking
sample measurements.
1. From the main menu use the or and and to select
MEASURE. Confirm.
2. Use the to change the following settings. Confirm every entry.
Option Description
Resolution Select the resolution: 1, 0.1, 0.01 (default) or 0.001
Measure Stability—select By stability Criterion: Fast (variation <
0.02 pH in 6 s), Standard (variation < 0.01 pH in 6 s) or Strict
(variation < 0.002 pH in 6 s). In continuous—enter the time
interval for the In continuous Acquis. interval (data storage or
printing data). By time—enter the time interval for data storage
or printing data.
Display mV Display mV—select YES or NO to show mV.
Limits Limits—select YES or NO. YES: Enter the upper and lower
limits. An acoustic warning appears when the measurement is
out of limit. The report output shows an A next to the
measured value when the measurement was out of limit.
Option Description
Isopotential Isopotential—change the Isopotential pH value in Data
introduction. Select Calculate to calibrate the probe again.
TC TC—select Linear or Natural waters. Linear: enter a value in
%/°C (default 2.00%/Temperature). Natural waters: Non-linear
for natural waters, according to EN27888
Tref Reference temperature—select between 20 or 25 °C or Other
temperature.
Pressure Barometric pressure—select a pressure between 600 and
1133 mBar (450 mmHg and 850 mmHg). Preset to 1013 mBar
Sal.Corr. Salinity correction—enter a correction factor between 00.0 and
45.0 g/L (preset to 1.0 g/L)
Display nA Display nA—select YES or NO to show DO current in nA
(nanoampere)
Note: The salinity value can be calculated from the conductivity value. Refer to
Table 7 on page 23
3. Push to start the measurement.
Note: If the measurement is not stabilizing after 120 seconds, the meter turns
automatically into the continuous measurement mode.
Advanced operation
Change the measurement units
The measurement units can be changed individually for each channel.
1. From the main menu use the or to select SYSTEM. Confirm.
2. Use the or to select Measurement units and confirm.
3. Select Channel 1 and confirm.
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