LeveLine
®
Instruction Manual
10401-01026 Rev D
If your data was logged using a -CTD Probe, actual salinity will be known so density
correction for temperature and salinity will be automatically applied and the density
correction options will be disabled.
If your data was logged with a standard Probe, you have the option to correct water density
for water temperature alone or for both water temperature and salinity.
If you are taking level measurements in fresh, clean water, there is no need to correct for
salinity so select 'Temp only'.
If you are taking level measurements in brackish or salt water and the salinity of the sample
water is known, select 'Temp & Salinity' then input the salinity in Practical Salinity Units
(PSU).
If you are taking level measurements in brackish or salt water and the specific EC
(Electrical Conductivity) of the sample water is known, select 'Temp & EC' then input the
specific EC in mS/cm
2
(corrected for 25°C). LeveLink
™
will
calculate the salinity based on
the EC and use this to correct for water density.
2.11.5. Offset Correction
An installation offset is often required to be added to, or subtracted from the logged level
data.
This offset should have been measured during installation and could, for instance, be the
distance between the LeveLine
®
Logger and the surrounding ground level, the local sea
level or the bottom of a river bed. See section
To apply an offset to your data, tick the 'Apply offset of:' tick-box and enter the required
offset.
If the water level is being referenced to some point above the LeveLine
®
Logger (such as
the top of the borehole), the offset should be recorded as a negative number.
If the water level is being referenced to a point below the LeveLine
®
Logger, such as a river
bed, the offset should be recorded as a positive number.
2.11.6. Data Averaging
When the LeveLine
®
Logger logs data, there is no averaging applied. Each logged point is
an instantaneous snapshot of temperature and pressure.
If you subsequently want to apply averaging to the logged data, to eliminate wave action for
instance, tick the 'Average over:' tick-box and select the number of readings you want to
include in the running average. When making this selection, bear in mind your logging rate.
© 2019 Aquaread
®
Ltd.
www.aquaread.com
Page 37 of 90
