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MIDAS WLR – Water Level Recorder

Designed for long or short-term deployments in offshore environments, or locations where a traditional shore-based tide gauge is impractical, the MIDAS WLR can be moored in line or to the seabed.

The standard instrument is fitted with a 0.01% accuracy pressure sensor and acetal housing for up to 500m depth rating, with a deep water titanium housed option also available.


Support

MIDAS WLR Datasheet
MIDAS WLR Operating Manual
DataLog X2 Operating Manual

Software

DataLog X2
1.1.0.1315

Technical Specifications

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

Type:
Temperature compensated piezo-resistive cell
Ranges:
10, 20, 30, 50, 100, 300 or 600 Bar
Precision:
±0.01%FS
Resolution:
0.001%FS

Temperature

Type:
Titanium housed PRT
Range:
-5°C to +35°C
Accuracy:
±0.01°C

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

RS232:
Up to 200m cable, direct to serial port via USB adapter
RS485:
Up to 1000m cable, addressable half duplex comms
Baud Rate:
2400 - 115200 (FSK fixed at 19200, USB 460800)
Protocol:
8 data bits, 1 stop bit, No parity, No flow control

Electrical

Internal:
8x C cells, 1.5V alkaline or 3.6V lithium
External:
9 – 30V DC
Power:
0.3W (sampling), <1mW (sleeping)
Battery Life:
125 days operation (alkaline) or 360 days (lithium) based
on a 40 second burst sample every 10 minutes
Connector:
SubConn MCBH10F

Software

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

Physical

Instrument:
88mmØ x 550mm, 7kg (Acetal), 11kg (Titanium)
Cage:
750mm x 140mm x 120mm
Depth Rating:
500m (Acetal), 6000m (Titanium)
Sensor range permitting.
Shipping:
100 x 18 x 49cm, 20kg (Acetal), 24kg (Titanium)

Ordering

0730043-XX
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.
Note:
XX denotes pressure transducer range.
Select from 10, 20, 30 or 50 Bar
0730046-XX
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.
Note:
XX denotes pressure transducer range.
Select from 100, 300 or 600 Bar

Product Enquiry

Valeport's Tide Range