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7ML19981CM01.1
MERCAP – INSTRUCTION MANUAL
Page 25
Installation
and Interconnection
This section discusses the following:
•
housing types supplied with the MST9500
•
supply voltage requirements
•
cable requirements
•
connection diagrams
Transmitter Module Housing
The MST9500 electronics is housed in a plastic box and fully potted in epoxy resin. This
construction is necessary for EEx approval and protects the components against mechanical
shock and the influence of moisture. The microprocessor is placed on an IC socket so the unit
can be upgraded at a later stage by implementing software changes.
The processor chip is covered with a special sticker that contains product information and
acts as a protection seal for moisture.
Note
: Damage or removal of the sticker voids the warranty for the MST9500.
In most cases, the transmitter is in a Milltronics-supplied metal housing, providing reliable
operation in environments with dust, moisture, and high frequency interference.
The electronics operate at temperatures ranging between -40
°
C to 85
°
C, which means that
protection equipment, such as sun shields, are not normally required.
Metal Housing and Electrode Assembly
The MST9500 is mounted in a powder-coated aluminium housing. The housing provides a
separate customer wiring area in line with the cable conduit inlet/outlet openings.
Terminals for:
•
Instrument connection (2-wire current loop)
•
Ground connection (wire with a sufficiently large conductor diameter)
As the measurement occurs between the Measurement and Ground connection, it is
important to have good, low-resistance, reliable connections in this circuit.
IMPORTANT: A reliable and stable ground connection is required to achieve a stable and
reliable measurement.
For the Ground connection, a solid electrical connection must be made between the
ground
point
on the housing and the process connection with either a stilling well and/or tank wall.
In the Milltronics housing, the ground connection between the transmitter and the housing
has already been made with the
ground connection point
. The instrument system ground
must be connected to this
ground connection point
.
The instrument loop connection for the MST9500 is a 2-wire cable. The positive wire must be
connected to terminal
1
(the terminal slot nearest the housing wall), and the negative wire to
terminal
2
. (See the connection diagrams on page 27.)
Siemens Automation