00809-0100-4835 Rev BD
3-5
For transmitter ranges 2 to 6, the span is continuously adjustable to
allow calibration anywhere between the transmitter URL and 1/10 of
URL. For example, the span on a Range 2 transmitter can be
continuously adjusted between 25 and 250 inH
2
O (6,22 kPa and 62,2
kPa).
For Range 1 transmitters, the span is continuously adjustable to allow
calibration anywhere between the transmitter URL and 1/5 of URL.
For example, the span on a Range 1 transmitter can be continuously
adjusted between 5 and 25 inH
2
O (1,25 kPa and 6,22 kPa).
The transmitter zero can be adjusted to achieve a maximum 90%
Zero Offset for suppressed zero calibrations and -100% Zero Offset
for elevated zero calibrations. To achieve these levels of zero
elevation and zero suppression, the 3150 Series is equipped with a
“Coarse Zero Select Jumper” located on the Electronics Assembly in
the electronics housing (see Figure 3-2).
A graphical representation of three calibrations is shown in Figure 3-
3. Procedures for setting the “Coarse Zero Select Jumper” are
provided in the Calibration Procedure section. The zero may be
elevated or suppressed with the limitation that no applied pressure
within the calibrated range exceeds the URL or LRL. During zero
elevation the transmitter may be calibrated to cross zero, ex. -75 to
75 inH
2
O (-18,6 kPa to 18,6 kPa).
Figure 3-3 – Graphical Representation of Elevated Zero, Zero Based, and
Suppressed Zero Calibrations for a Range 2 Transmitter
(-62,2)
-
-12,4)
Differential Pressure Input
inH
2
O
Elevated Zero
Calibration
2
-62,2 to -37,3 kPa)
0 to 100 inH2O
(0 to 24,9 kPa)
Suppressed Zero
Calibration
2
(-37,3)
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