Thermo Scientific LevelPRO Series, Installation Manual

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Wiring
Cascade Mode Wiring
Thermo Fisher Scientific LevelPRO Installation Guide
4-11
For applications requiring a detector length greater than twelve feet,
multiple units can be wired together to act as one continuous detector. In
this situation, the highest or top gauge in the line, or cascade, is the master.
All wiring for the serial ports, relays, etc. is done in the master unit.
Remaining units are slave units. All slaves must be powered in the same
manner as the master (either AC or DC).
The lowest gauge in the line must be wired with its CASCADE OUT to
the CASCADE IN of the gauge directly above it. Each gauge in the cascade
is wired in this manner (CASCADE OUT to the CASCADE IN of the
next unit), up to the master gauge. The master has only a CASCADE IN.
Each gauge takes the count rate coming into it on the CASCADE IN line
from the detector immediately below it, adds the value to its own internal
count rate, and then outputs the total on the CASCADE OUT line to the
detector immediately above in the cascade.
Refer to drawings
868503 and 868529 in the drawing appendix for the
wiring requirements. Additional information on cascade mode wiring can
be found in Technical Bulletin TB-0416-019.
There is an auxiliary connection on connector J10 for applications
requiring an outside 4–20 mA signal be input into the LevelPRO and used
as a form of compensation adjustment (vapor density, pressure, etc.). The
outside 4–20 mA signal should be wired so that the positive connection of
the loop is connected at J10 pin 1 and the negative side connected to J10
pin 2. The special equation is then utilized to incorporate this input into
the LevelPRO program. Refer to the LevelPRO user guide for information
on special equations.
Cascade Mode
Wiring
Auxiliary Input
Wiring