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CALIBRATION
CALIBRATION PROCEDURES
WBPEEUI110506A0
4 - 3
7. Apply a pressure to the cell equal to the configured or
desired upper range value.
8. The milliammeter should read 20.000 mA plus or minus
the tolerance for the particular transmitter listed in Table
.
9. If the output is not within the limits specified in Steps 6
and 8, calibrate the unit. To do so, press the CALIBRATE
key
on the Type STT terminal and follow the procedure in the
STT Smart Transmitter Terminal Instruction
10. Turn the - (negative) test terminal jumper screw clockwise
until tight.
D/A ADJUSTMENT (FINE TUNING THE ANALOG LOOP)
This procedure does not require removal of the covers from the
electronics housing. Compensation for slight inaccuracies in
the four to 20-milliampere current loop (or in receiving devices
such as recorders) is accomplished by accessing the calibra-
tion menu on the Type STT terminal while it is connected to
the target Type PTSP pressure transmitter. This procedure
does not adjust the zero or span of the transmitter and only
applies when first installing the system or if something in the
four to 20-milliampere current loop has changed. To adjust
the zero of the transmitter, refer to
.
Either connect the DMM, set to measure DC milliamperes, in
series with the four to 20-milliampere current loop, or make a
parallel connection across the precision 250-ohm resistor
shown in Figure
, with the DMM set to measure VDC. With
the latter setup, the four to 20-milliampere output corre-
sponds to one to five VDC.
NOTES:
1.
These notes only apply when measuring VDC across the
250-ohm resistor shown in Figure
2-4
.
Table 4-1. Analog Mode
Calibration Tolerances
Type
Tolerance
mA
VDC (across
precision resistor)
PTSPAG
0.016
0.004
PTSPAJ
PTSPGG
PTSPGJ
PTSPAE
0.032
0.008
PTSPGF
Содержание platinum standard PTSP Series
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