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Reference Manual
00809-0100-4388, Rev BA
January 2008
Rosemount 1153 Series D
5-2
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 insure 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 connection or meter should not exceed 10 Ω.
BOARD CHECKOUT NOTE
Numbers in parentheses refer to item numbers in Figure 5-2 on page 5-7.
NOTE
The Rosemount 1153 Series D 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
malfunctioning 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.
The “R” and “P” electronics circuits boards are interchangeable and either
may be used. They must, however, be used as a pair (i.e., you must use an
“R” calibration board with the “R” amplifier board and not with the “P”
amplifier board). This also applies to the “P” calibration board.
Figure 5-1. Header Board
Connections.
SENSING MODULE
CHECKOUT
NOTE
Numbers in parentheses refer to item numbers in Figure 5-2 on page 5-7.
The sensing module (12) is not field-repairable and must be replaced if
defective. If no defect such as a punctured isolating diaphragm or loss of fill
fluid is observed, check the sensing module in the following manner.
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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