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CALIBRATION
RERANGING THE ANALOG OUTPUT
REZERO PROCEDURE
RERANGING THE ANALOG OUTPUT
4 - 6
9. Since the transmitter is configured for digital operation,
the milliammeter should read below four milliamperes.
NOTE: If the four to 20-milliampere output changes with respect to
pressure, then the unit is not in the digital mode. To enter this mode,
press the CONFIGURE key on the Type STT terminal and follow the
step-by-step procedures in the Type STT Smart Transmitter Ter-
minal Instruction . Use the SEND CONFIG key to download the
new configuration to the transmitter
10. Press the OUTPUT key on the Type STT terminal and select
MONITOR OUTPUT.
11. The Type STT terminal should display 100.00% (±0.15%).
12. If the digital output is not within the limits stated in
Steps 7 and 11, calibrate the transmitter. To do so, press the
CALIBRATE key on the Type STT terminal and follow the pro-
cedures in the Type STT Smart Transmitter Terminal
Instruction.
13. Turn the - (negative) test terminal jumper screw clockwise
until tight.
By pressing the RERANGE key on the Type STT terminal, the
current (four to 20-milliampere) output can be quickly
reranged to represent a different portion of the input span.
This procedure bypasses the need to completely configure the
Type PTSD pressure transmitter. Damping, engineering units,
and the temperature alarms can also be adjusted during
rerange.
NOTE: The transmitter output is based on the values entered in this
procedure. The terminal will not reject invalid ranges; therefore, it is
imperative that the operator know the range limits specified for the
transmitter. Refer to Table
This procedure zeroes the transmitter only and does not com-
pensate for slight inaccuracies in the four to 20-milliampere
current loop. To adjust for these inaccuracies, refer to
ADJUSTMENT (FINE TUNING THE ANALOG
By pressing the REZERO key on the Type STT terminal, the
transmitter can be zeroed without performing a complete
bench calibration. There is no effect on the span of the
transmitter.
(Section
5).
1-2
for the proper ranges.
LOOP).
D/A
WBPEEUI110504A0
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