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11/14/2006 Rev. 14
Safety Summary
All cautions and instructions that appear in this manual must be complied with to prevent
personnel injury or damage to the Probe Transmitter or connected equipment. The
specified limits of this equipment must not be exceeded. If these limits are exceeded or if
this instrument is used in a manner not intended by Marathon Sensors Inc., damage to this
instrument or connected devices could occur.
Do not connect this device directly to AC motors, valves, or other actuators. All AC alarm
functions must be connected through an interposing DC coil relay with a maximum coil
load of 0.5 amps DC. The Probe Transmitter is not rated to act as a safety device. It
should not be used to provide interlocking safety functions for any temperature or process
functions. Alarm capabilities are provided for probe test and input faults only and are not
to be considered or used as safety contacts in any application.
Connections
The Probe Transmitter has four removable terminal blocks grouped with four terminals
each. Each terminal is a wire clamp type with a standard slot screw. Each clamp can
accommodate AWG 24 to 12 flexible stranded wire. Maximum torque on the terminal
screws should not exceed 0.8 Nm.
The figure below shows the arrangement of the terminals.
LOWER
UPPER
UPPER
LOWER
- + N/C N/C
AO2
1 2 3 4
5 6 7 8
- + - +
TC MV
AO1 COM NO
- + EVT EVT
13 14 15 16
RS485 24VDC
- + - +
9 10 11 12
Figure 2 Terminal Layout