Reference Manual
00809-0100-4835 Rev BE
February 2018
Rosemount 3150 Series
Calibration
24
WARNING
Process leaks could result in death or serious injury.
•
Install and tighten all four flange bolts before applying
pressure.
•
Do not attempt to loosen or remove flange bolts while
the transmitter is in service.
WARNING
Replacement equipment or spare parts not approved by
Rosemount Nuclear for use could reduce the pressure
retaining capabilities of the transmitter and may render the
instrument dangerous or adversely impact its qualified status.
•
Use only components supplied with the 3152, 3153 or
3154 transmitter or designated by Rosemount Nuclear
as spare parts for the 3152, 3153 or 3154.
NOTE
The pressure unit “inches H
2
O at 68ºF (20ºC)” is used
throughout this section. For ease of reading this pressure unit
will be abbreviated to “inH
2
O”.
CALIBRATION OVERVIEW
Calibration Considerations
Review this section to become familiar with the fundamentals
of calibrating the Rosemount 3150 Series transmitter. Contact
Rosemount Nuclear with questions regarding calibrations that
are not explained in this manual.
Rosemount 3150 Series transmitters are factory calibrated to
the range shown on the nameplate (see
). This
range may be changed within the limits of the transmitter.
Zero may also be adjusted to elevate (for all models except
absolute pressure reference) or suppress (for all models).
Calibrations that have a lower range value below zero are
termed zero elevated while calibrations that have a lower
range value above zero are termed zero suppressed.
NOTE
Transmitters are factory calibrated at ambient temperature
and pressure to the customer’s specified range. If calibration
is not specified, transmitters are calibrated 0 to Upper Range
Limit (URL).
The zero and span are adjusted during calibration using zero
and span adjustment screws. The adjustment screws are
accessible externally and are located behind the access cover
plate on the side of the electronics housing (see
).
Transmitter output increases with clockwise rotation of the
adjustment screws. For normal calibration adjustments, the
zero adjustment screw has negligible effect on the span and
the span adjustment has negligible effect on the zero.