Vaisala HMD70U Service Manual Page 91

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89
The Vaisala HUMICAP
®
Hand-Held
Moisture for Oil Meter MM70 is
designed for field checking MMT330
transmitters.
The display alarm allows tracking
of any measured parameter, with a
freely configurable low and high limit.
Data Collection and
(Wireless) Transfer to PC
The recorded measurement data
can be viewed on the display or
transferred to a PC with Microsoft
Windows
®
software. The transmitter
can also be connected to a network
with an optional (W)LAN interface,
which enables a (wireless) Ethernet
connection.
Versatile Outputs and
Easy Installation
The MMT330 provides up to three
analog outputs. Galvanic isolation of
supply power and analog outputs is
also available. For serial interface the
USB connection, RS232 and RS485
can be used. In addition, alarm relay
option is available.
The MMT330 has several options for
transmitter mounting. Transmitters
are delivered pre-configured with all
settings installation ready.
MMT330 is also capable in applying
the MODBUS communication protocol
and together with an appropriate
connection option provides either
MODBUS RTU (RS485) or MODBUS
TCP/IP (Ethernet) communication.
Water Content as ppm
Conversion
In addition to water activity, the
MMT330 can output ppm, the average
mass concentration of water in oil.
Vaisala has this conversion readily
availabe for mineral transformer oil.
For other oils, the oil specific
conversion coefficients can be
programmed to the transmitter if the
water solubility of the oil is known.
Graphical Measurement
Trend and Historical
Display
The MMT330 can be ordered with a
large numerical and graphical display
with a multilingual menu. It allows
the user to monitor operational data,
measurement trends and up to 1-year
measurement history. The optional
data logger with real-time clock
makes it possible to generate over
four years of measured history, and
zoom in on any desired time or time
frame.
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