Vaisala HydroMet Service Manual download pdf (Page 10)

Technical Description ________________________________________________________________

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The MAWS is the most modern HydroMet system including all

necessary functions designed on a single printed board logger. Using

the latest Surface Mounted Technology the board is very compact and

uses little current. It has a very high Mean-Time-Between-Failure

(MTBF) value (over 20,000 hours strictly according to MIL-HNDB-

217F).

The MAWS HydroMet systems are field proven in various

installations around the world. The MAWS stations are already in use

in over 65 countries around the world.

For example, the MAWS301 stations are used in the Surface Weather

and Airport systems in the SIVAM (Sistema de Vigilancia da

Amazonia) in Brazil. Climatological networks in Poland, Romania

and Brazil are equipped with the MAWS systems. The Swedish

Hydrological and Meteorological Institute (SMHI) automated their

whole hydrological network using the MAWS301. In addition, the US

Air force’s new generation Tactical Meteorological (TACMET)

Observation System is based on the same MAWS technology with

300 systems already in field operations. For further details of MAWS

references, please see the MAWS Reference List.

Based on Vaisala’s continuous product development, the MAWS

HydroMet system offers a versatile system concept with a planned

upgrade path to meet future customer requirements.

Expandability

MAWS HydroMet systems are already economical in applications,

requiring only few sensors. However, they are easily and

economically expandable to incorporate a large number of sensors,

including intelligent sensors with different types of serial interface.

The total number of inputs in the basic data logger is 20 analog inputs

(single ended) with the possibility to use them as digital inputs (state),

2 counters and a dedicated input for a Vaisala atmospheric pressure

sensor (frequency). Intelligent sensors can be interfaced using the RS-

232, RS-485 and SDI-12 serial interfaces, up to 7 ports.

The new optional expansion modules include:

• QMI108 Digital I/O Module with 8 digital inputs and 8 digital

outputs for digital measurements and control purposes.

• QMU101 Sensor Multiplexer with additional 20 single ended (10

diff.) analog inputs

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Vaisala HydroMet Service Manual Page 10