Specifications

molbox™ RFM™ OPERATION AND MAINTENANCE MANUAL
© 1998-2007 DH Instruments, a Fluke Company Page 138
5.2.4.1 VIEWING RPT OUTPUTS
 OPERATION
To view the molbox RFM RPT outputs press [SPECIAL] and select
<4cal>, <1pressure>.
The display is:
Select RPT: 1upstrm
2dnstrm 3micro
The <3micro> option is not present if the molbox RFM does not have the
microrange option (see Section 3.1.5). Select the desired RPT and then
select <1run>.
Selecting <3micro> causes a warning message to appear concerning possible
overpressure of the microrange RPT. To view the microrange RPT differential
reading, the microrange bypass valve will be operated to connect the microrange
RPT to the differential pressure (see
Figure 15). If the differential pressure
is
too high, the microrange RPT may be overpressured and damaged
(see Section 3.1.6). Be sure the differential pressure between the molbox RFM
UP (HI) and DOWN (LO) ports does not exceed 13 kPa (2 psi), then press
[ENTER] to proceed.
If the selection was <1upstrm> or <2dnstrm>, molbox RFM’s internal valves
operate to connect both absolute RPTs to the upstream pressure port (see
Figure 14).
The display is:
Upstrm zRPTz dwnstrm
97.830 kPaa 97.825
The upstream absolute RPT reading is on the left and the downstream absolute
reading is on the right.
If the AutoZ function is turned on, the AutoZ correction is applied to these
pressure values and the “z” indicators are present as shown above (see Section
3.4.4.4). If AutoZ is off, the correction is not applied and the indicators are not
present.
The values displayed are the readings for the RPTs with the current PA and PM
calibration coefficients applied but without the tare applied (see Sections
5.2.1.1
and). Both the upstream and downstream absolute RPTs are shown
together
because they are usually calibrated simultaneously.
Pressing [ESCAPE] or [ENTER] returns to the previous screen.
Selecting <3micro> will put the microrange RPT into service by operating the
microrange bypass valve. If the differential pressure present is > 13 kPa (2
psi), damage to the microrange RPT may result. Be sure differential
pressure is < 13 kPa (2 psi) before pressing [ENTER] to proceed (see Section
3.1.6). Do not apply > 13 kPa (2 psi) to the microrange RPT or damage may
result.
The RPT readings viewed by pressing [SPECIAL] and selecting <4cal> DO NOT
have the tare applied and are valid for RPT calibrations. The RPT readings
viewed by pressing [P&T] DO have tare values applied and therefore should
not be used for taking RPT calibration data (see Section 3.4.4.1 for
information on tare values)