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.
Temperature compensated piezo-resistive cell
10, 20, 30, 50, 100, 300 or 600 Bar
Titanium housed PRT
-5°C to +35°C
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.
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.
Up to 200m cable, direct to serial port via USB adapter
Up to 1000m cable, addressable half duplex comms
2400 - 115200 (FSK fixed at 19200, USB 460800)
8 data bits, 1 stop bit, No parity, No flow control
8x C cells, 1.5V alkaline or 3.6V lithium
9 – 30V DC
0.3W (sampling), <1mW (sleeping)
125 days operation (alkaline) or 360 days (lithium) based on a 40 second burst sample every 10 minutes
System is supplied with DataLog Express Windows based PC software, for instrument setup, data extraction and display. DataLog Express is license free.
88mmØ x 550mm, 7kg (Acetal), 11kg (Titanium)
750mm x 140mm x 120mm
500m (Acetal), 6000m (Titanium) Sensor range permitting.
100 x 18 x 49cm, 20kg (Acetal), 24kg (Titanium)
MIDAS WLR in Acetal 0.01% pressure sensor PRT temperature sensor Supplied with: · Mooring cage · SubConn switch plug · 3m communications lead · USB adapter · DataLog x2 software · Manual, tool kit and transit case.
XX denotes pressure transducer range. Select from 10, 20, 30 or 50 Bar
MIDAS WLR in Titanium 0.01% pressure sensor PRT temperature sensor Supplied with: · Mooring cage · SubConn switch plug · 3m communications lead · USB adapter · DataLog x2 software · Manual, tool kit and transit case.
XX denotes pressure transducer range. Select from 100, 300 or 600 Bar
Valeport’s industry-leading TideMaster Tide Gauge is as the core of Tidestation, bringing Pressure, Radar and hybrid tidal observation techniques coupled with interfaces to other meteorological and 3rd party systems.