Figure 8. Molbox Rfm Internal Pneumatic Schematic - Leak Check Molbox - Fluke MOLBOX RFM Operation And Maintenance Manual

molbox™ RFM™ OPERATION AND MAINTENANCE MANUAL
Once the molbox RFM pressure connections are vented, press [ENTER].
molbox RFM counts down for 60 seconds while monitoring the ratio of the two
pressures and then determines whether an internal leak was present.
A significant leak in a pressure isolation valve or a bypass valve between the two
channels will cause the ratio between the two pressures to vary.
The molbox RFM LEAK CHECK function
should end with the prompt:
If any other prompt is present, repeat the process.
equipped with the microrange option, run the leak test with the microrange in the
opposite condition (active or bypassed). If the leak check fails consistently, note
the failure message and contact a DHI Authorized Service Provider.
© 1998-2007 DH Instruments, a Fluke Company
Internal Pneumatic Schematic – LEAK CHECK molbox
1. The pressure read by the upstream RPT (left),
the downstream RPT (right) and the pressure
unit of measure (middle).
2. The ratio of the upstream RPT reading to the
downstream RPT reading.
3. Leak check count down in seconds.
Page 48
1. High Isolation:
2. Low Isolation:
3. Bypass:
4. Mirorange Bypass: Closed if Active
Figure 8. molbox RFM
347.466 kPaa
1.03579:1
molbox passed the
leak check
Closed
Closed
Closed
Open if Bypassed
35.459
WAIT: 60
If the molbox RFM is