Crystal XP2i-DP Digital Differential Pressure Gauge - Manual (Page 8)

Applications  6
XP2i-DP Operation Manual
Applications
—
dIfferentIal pressure
The XP2i-DP may be used to determine accurate differential pressure measurements across a range of applications or installations such as filters,
orifice plates, valves, etc. For example, in a piping system with an upstream static pressure of approximately 80 psig, the XP2i-DP may be used to
determine the 10 psid pressure drop across the device under test (DUT). In this case, the product would be connected as shown below.
FLOW 80
PSI
70
PSI
XP2i-DP
Device Under Test (DUT)
100 PSID
XP2i Digital Test Gauge
Hi
Lo
peak
clear
zero units
The pressure measurement accuracy of the gauge in this example is a combination of the standard accuracy statement and the static line pres-
sure effect. The 10 psid pressure, when compared to the 100 psi full scale product used, will require the 0 to 20% of Full Scale, ± (0.02% of Full
Scale) accuracy statement. The static line pressure effect relates to the lowest test pressure applied in the test, or in this case 70 psi.
The pressure measurement accuracy for this test condition is as follows:
± (0.02% x 100 psi) + (0.0003 psi x 70 psi) = ± 0.04 psi.
When using a 15 psi full scale gauge, this will require the 20 to 100% of Full Scale, ± (0.1% of Reading) accuracy statement.
± (0.1% x 10 psi) + (0.0003 psi x 70 psi) = ± 0.031 psi.