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1 .2
Product description
The MTL831C/MTL831C-PS Analog Transmitter can transfer a number of hazardous
area input signals to the safe area down a data highway consisting of a single
shielded, twisted-pair cable. It is intrinsically safe and can therefore be mounted in
Zone 0 hazardous areas or hazardous locations.
The MTL831C/MTL831C-PS can monitor up to 16 inputs from THC or millivolt
sources or 2, 3 or 4-wire RTDs or potentiometers. Multiple versions of the MTL831C/
MTL831C-PS are available to support fixed and pluggable screw terminal input
options. See the Components and Accessories section for part numbers.
A data highway is provided that can carry both signal and power over distances up to
2km, depending on the application, the cable and the (noise) environment. Shielded
twisted pair is highly recommended.
At the other end of the data highway, an MTL838C Receiver translates the
information transmitted from the MTL831C/MTL831C-PS. Multiple versions of the
MTL838C are available to support different control system interfaces. See the
Components and Accessories section for part numbers. One or two MTL831C/
MTL831C-PSs may be connected to a single MTL838C. The MTL838C provides
a *Modbus
serial data output representation of the inputs together with status
®
information.
When the MTL831C/MTL831C-PS transmitter is mounted in the hazardous area, the
data highway must be protected by an MTL5553 Isolator/Power Supply mounted in
the safe area.
* Modbus
is a registered trademark of Schneider Automation Inc.
®
2
GETTING STARTED
Installation of the MTL831C/MTL831C-PS multiplexer transmitter is divided into
three main topics.
•
Mechanical Installation - how to mount the MTL831C/MTL831C-PS and how
it may be fitted into an enclosure.
•
Electrical Connections - the sensor and highway connections. If units are
installed in our enclosures, it details any special wiring arrangements.
•
Configuration - the address is configured with a user supplied jumper wire.
The remaining configuration is either over a Modbus® link or software on a PC.
A new user might find it helpful to set up the system, or a simple version of it, in
an indoor test area to gain familiarisation before undertaking installation on site.
NOTE
INM MTL831C Rev 7
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