00809-0100-4835 Rev BD
3-6
The following calibration procedures describe the recommended
steps necessary to calibrate the Rosemount 3150 Series pressure
transmitters.
The 3150 Series pressure transmitters contain electronic circuit
boards which may be static sensitive.
Electronics housing covers do not need to be removed to access the
zero and span adjustment screws.
The pressure unit “inches H2O @ 68ºF (20ºC)” is used throughout
this section. For ease of reading and to conserve space, this
pressure unit will be abbreviated to “inH2O”.
Zero Based Calibration Procedure
(LRV is zero DP)
The adjustment screws are accessible externally and are located
behind the access cover plate on the side of the electronics housing
(see Figure 3-1). The transmitter output increases with clockwise
rotation of the adjustment screw. The Coarse Zero Select jumper is
in the Nominal position for all zero based calibrations.
1. Apply a pressure equivalent to the LRV to the high side
pressure connection and turn Zero adjustment until output
reads 4 mA.
2. Apply a pressure equivalent to the URV to the high side
process connection and turn Span adjustment until output
reads 20 mA.
3. Check to assure desired outputs are achieved and repeat
steps 1 and 2 if necessary.
Figure 3-4 contains an example of calibrating a transmitter with a zero
based calibration. Figure 3-4a uses English Units (inH
2
O) while
Figure 3-4b uses SI Units (kPa).
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