Rosemount 3150 Series
Reference Manual
00809-0100-4835 Rev BD
July 2016
3-3
Definitions
The following definitions and descriptions are provided to aid in
calibration:
DP
Differential pressure between the high pressure “H” and low pressure
“L” process inputs, as marked on the transmitter module.
Upper Range Limit (URL)
The highest pressure the transmitter can be adjusted to measure,
specified in the model ordering information by pressure range code.
Upper Range Value (URV)
The highest pressure the transmitter is adjusted to measure. This
pressure corresponds to 20mA output point.
Lower Range Value (LRV)
The lowest pressure the transmitter is adjusted to measure. This
pressure corresponds to the 4mA output point.
Span = |URV - LRV|
Zero Based Calibration
Calibration where the LRV is zero DP (see Figure 3-3)
Elevated Zero Calibration
Calibration where the LRV is less than zero DP (i.e. the LRV is
achieved when a positive pressure is applied to the low pressure side of
the DP cell or a vacuum is applied to the high pressure side of the DP
cell – see Figure 3-3).
Suppressed Zero Calibration
Calibration where the LRV is greater than zero DP (i.e. the LRV is
achieved when a positive pressure is applied to the high pressure side
of the DP cell or a vacuum is applied to the low pressure side of the DP
cell – see Figure 3-3).
% Zero Offset
= (LRV/URL) X 100
Note: % Zero Offset is used when making coarse zero adjustments and
replaces the traditional % Zero Elevation and % Zero Suppression
terms. This concept is used due to the limited interaction between zero
and span adjustments on the 3150 series pressure transmitter.
Sign Convention
Positive numbers indicate positive pressure is applied to the high
pressure side of the DP cell or a vacuum is applied to the low pressure
side of the DP cell. The high pressure side is indicated on the sensor
module by an “H”.
Negative numbers indicate positive pressure is applied to the low
pressure side of the DP cell or a vacuum is applied to the high pressure
side of the DP cell. The low pressure side is indicated on the sensor
module by an “L”.
Summary of Contents for 3152
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