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3. OPERATION
Page 73 © 2004-2007 DH Instruments, a Fluke Company
3.5.7 <7INTERNAL>
PURPOSE
To view, set, adjust, and maintain various aspects of RPM4’s internal operation.
OPERATION
To access the internal selections press [SPECIAL],
<7internal>. The display is:
1baro 2ReadRt 3RPT2x
4lo vnt 5log
The INTERNAL menu choices include:
<1baro> View the real time output of the on-board barometer, if present (see Section
3.5.7.1).
<2ReadRt> Turn ON and OFF RPM4’s automated, rate of change dependent, reading
integration rate feature (see Section 3.5.7.2).
<3RPT2x> Enable and disable RPM4 parallel measurement mode in which two Q-RPT
modules are used to measure in parallel and their readings are averaged
(see Section 3.5.7.3).
<4lo vnt> Operate Q-RPT module Gxxx and BGxxx low VENT valve directly
(see Section 3.4.7.4).
<5log> View the RPM4 incident log (see Section 3.5.7.5).
3.5.7.1 <1BARO>
PURPOSE
To view the value of atmospheric pressure as measured by the RPM4 on-board
barometer.
There is no on-board barometer in RPM4’s that have Gxxx (gauge) internal
Q-RPTs only.
PRINCIPLE
RPM4’s that include an Axxx (absolute) and/or BGxxx (bi-directional gauge)
Q-RPT are equipped with a separate, on-board barometer. The atmospheric
pressure measurements made by the on-board barometer are used for dynamic
compensation of atmospheric pressure when using an Axxx Q-RPT to make gauge
pressure measurements (see Sections 3.3.3, PRINCIPLE and 3.2.2) and for static
pressure compensation when using a G15K or BG15K Q-RPT.
See Section 5.5, Figure 7 and Section 5.6, Figure 8 for a photo and
schematics showing the position of the on-board barometer in RPM4.
The on-board barometer is a low accuracy sensor used only for measuring
small changes in atmospheric pressure over short periods of time
(see Section 3.2.2) and for line pressure compensation when using a G15K or
BG15K Q-RPT. RPM4 measurement uncertainty does not depend on the
measurement uncertainty of the on-board barometer.