RPM4™ OPERATION AND MAINTENANCE MANUAL

The following operating conditions are specific to differential mode:

Main run screen measured pressure display

The display of measured pressure in the main run screen is the difference between the Hi and the Lo Q-RPTs (Hi – Lo) with a differential mode AutoZ correction (see Section 3.3.9.3). The pressure measurement mode indicator is <d>. The Q-RPT position indicator is <Hd>.

Default DISPLAY function

The default display function is RPT with the Lo Q-RPT

 

displayed on the bottom display line (see Section

 

3.3.6.4). This allows the line pressure (Lo Q-RPT

 

indication) to be viewed simultaneously with the

 

differential pressure. All other DISPLAY functions

 

(average, rate, deviation, HiLo, freeze) apply to

 

the differential pressure

SDS function

[SDS] key operation to OPEN SDS opens SDS of

 

both the Hi and Lo Q-RPTs simultaneously. (see

 

Section 3.3.8). Overpressure is driven by the pressure

 

range of the Lo Q-RPT (see Section 3.4.4.1).

AutoZ function

AutoZ manages zeroing of differential mode and is

 

intended to “tare” the two Q-RPTs at a common

 

line pressure (see Section 3.3.9.3). Switch to a

 

mode other than differential for AutoZ functions of

 

an individual Q-RPT.

Leak Check function

The leak check function uses the differential mode

 

measurement (see Section 3.3.5).

Head function

The head function applies to the differential

 

pressure (see Section 3.3.7).

AutoRange function

Differential measurement mode is not available in

 

AutoRange (see Section 3.3.4).

UL function

The UL limits apply to positive and negative

 

differential pressure (see Section 3.4.4) and the

 

default is the maximum value of the differential

 

pressure. Both the Lo and Hi RPT base

 

measurement mode ULs also remain active. The

 

Hi RPT UL provides a upper limit for the maximum

 

pressure on the Hi side of the differential pressure.

 

Both the differential and base mode Hi RPT UL

 

cause the display of differential pressure to flash

 

when exceeded. The Lo RPT UL provides an

 

upper limit for the line pressure.

AutoTest function

The AutoTest function (see Section 3.3.10) is not

 

available in differential measurement mode.

3.3.4 [AU T O RAN GE]

PURPOSE

To automatically set up RPM4 to optimize its measurement characteristics and features for specific, user specified range of operation.

PRINCIPLE

RPM4 is designed to support the calibration and test of a very wide variety of test ranges in various measurement modes.

© 2004-2007 DH Instruments, a Fluke Company

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Fluke RPM4 Main run screen measured pressure display, Default Display function, SDS function, AutoZ function, UL function