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Reference Manual
00809-0100-4514, Rev BA
January 2008
Rosemount 1154
5-2
SAFETY MESSAGES Instructions and procedures in this section may require special precautions to
ensure the safety of the people performing the operations. Information that
raises potential safety issues is indicated by a warning message. The following
warning messages appear in this section.
TEST TERMINALS The test terminals are connected across a diode through which the loop signal
current passes. The indicating meter or test equipment shunts the diode when
connected to the test terminals. As long as the voltage across the terminals is
kept below the diode threshold voltage, no current passes through the diode.
To ensure that there is no current leaking through the diode while making a test
reading or when connecting an indicating meter, the resistance of the test con-
nection or meter should not exceed 10 Ω.
BOARD CHECKOUT NOTE
Numbers in parentheses refer to item numbers in Figure 5-2 on page 5-5.
NOTE
The Rosemount 1154 Pressure Transmitter contains electronic circuit boards
which may be static sensitive.
You can easily check the printed circuit boards (5 and 6) for a malfunction by
substituting spare boards into the circuit. If this procedure turns up a malfunc-
tioning board, return the defective board to Rosemount Nuclear Instruments,
Inc. for replacement. Because of parts traceability, qualification becomes the
responsibility of the customer in the event of unauthorized board repairs.
Figure 5-1. Header Board
Connections.
Use only the procedures and new parts specifically referenced in this manual to
ensure specification performance and certification compliance. Unauthorized
procedures or parts can render the instrument dangerous to life, limb, or property.
Process O-rings may retain some process fluid after disassembly of process
flanges. If this fluid is determined to be contaminated, take appropriate safety
measures.
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