CALIBRATION
ALTERNATE CALIBRATION METHOD
4 - 8
WBPEEUI110505A0
Digital Mode Transmitters
1. Connect the transmitter in a calibration setup such as the
one shown in Figure
2. Orient the transmitter in a position that corresponds to the
orientation it is expected to have in service.
3. Through the low pressure (-) side, apply a pressure equal
to the desired input span of the transmitter. Span equals
upper range value minus lower range value.
4. Since the transmitter configuration is for digital operation,
the milliammeter should read below 4 mA.
5. Press the CALIBRATE key on the Type STT terminal and
adjust the output of the transmitter to 0.00,
±
0.20% by follow-
ing the procedures in the
Type STT Smart Transmitter Ter-
6. Vent the low pressure (-) side to the atmosphere.
7. Use the up arrow and down arrow keys to set the output to
100.00,
±
0.20%.
8. Since the transmitter is configured for digital operation,
the milliammeter should read below 4 mA.
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 (
Section 5
).
9. Repeat Step 3 and see that the output is zero percent and
has not shifted. If the output has shifted, repeat Steps 5
through 9.
10.
For Zero Based Calibrations
— Vent the low pressure (-)
side to the atmosphere, press the CALIBRATE key and set the
output to 0.00,
±
0.20%.
11.
For Other Than Zero Based Calibrations
— Apply a
pressure to the low pressure (-) side equal to the desired span
minus the desired upper range value. Press the CALIBRATE
key and set the output to 0.00,
±
0.20%.
Содержание Platinum standard Series
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