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The MIDAS TMS represents an evolution in the field of Tide Gauges and Environmental Monitoring Stations. Based on Valeport’s proven data acquisition techniques, the MIDAS TMS can be configured with a wide selection of commonly used sensors. Features such as touch screen operation and rugged environmental housing make it ideal for stand alone applications, but it can just as easily become an integrated part of your LAN, with ethernet, WiFi, radio and dial up communications options.
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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 piezo-resistive cell with internal temperature compensation, giving the accuracy and resolution levels normally associated with a resonant quartz sensor, but with increase durability, stability and recalibration intervals. |
| Pressure: |
Type : Temperature compensated piezo-resistive cell |
| Ranges : 100, 200, 300 or 500 dBar |
Precision : ±0.01%FS |
Resolution : 0.001%FS |
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| Temperature: |
| Type : Titanium housed PRT |
| Range : -5° C to 35° C |
| Accuracy : ±0.01%C |
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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 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 recommeded that the 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 meters or feet of water.
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| Memory: |
| Standard memory is 16Mbyte FLASH, wich is capable of approximately 2.8million records. The memory is non-volatile, so data and configuration are retained in the event of power failure. |
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| Power: |
Uses 8 x 1.5v alkaline or 3.6v lithium C cells. Nominal power consumption at 12v is 20mA during sampling, dropping to less than 0.1mA during sleep mode. A typical regime of 40 second sampling every 10 minutes will allow a life in excess of 60 days with alkaline cells, extending to over 120 days with lithium cells. External power input is 9 - 30vDC. |
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| Communications: |
RS232, RS485 and RS422 communications as standard. Baud rate is selectable from 2400 to 460, 800 (PC serial port permitting). Use RS232 comms for cable lengths up to 200m, extending to 1000m for RS485/RS422. FSK modem comms are optionally available for real time data output over 6km cable. |
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