MIDAS WLR – Water Level Recorder

Sensors

The MIDAS WLR comes with a choice of pressure sensor ranges to suit the
depth requirement of the operator. The sensor used is a revolutionary piezoresistive
cell with internal temperature compensation, giving the accuracy and
resolution levels normally associated with a resonant quartz sensor, but with
increased durability, stability and recalibration intervals.

Pressure

Temperature

Data Acquisition

In line with other Valeport MIDAS series instrumentation, the MIDAS WLR
samples data points at up to 8Hz, and has a variety of operating modes
including continuous data output, triggered sampling, and data bursting. The
typical configuration for this instrument is to sample data in a burst mode for a
user defined integration period, selectable from a single sample up to 600
seconds. This data burst may then be repeated at a suitable regular interval,
from once per minute to once per day.
Sampled data may either be recorded in its entirety, or simply averaged and
recorded along with standard deviation data. It is usually recommended that
data is averaged over an integration period of 40 seconds to filter the effects of
any wave activity.
Note that Valeport’s distributed processing concept allows the pressure data to
be automatically converted into the user’s choice of units, including metres or
Feet of water.

Memory

Standard memory is 16Mbyte FLASH, which is capable of storing approximately
2.7 million records. The memory is non-volatile, so data and configuration are
retained in the event of power failure.

Communications

Electrical

Software

System is supplied with DataLog Express Windows based PC software, for
instrument setup, data extraction and display. DataLog Express is license free.

Physical

Ordering