The Vent And Atm Ports; Check/Set Security Level; Sds Full Time Off - Fluke RPM4-AD Operation And Maintenance Manual

Using the RPM4-AD connected to a system with liquid contaminants without taking
proper precautions to purge the system and test line may cause contamination of the
RPM4-AD that will require non-warranty service.
2.3.6

THE VENT AND ATM PORTS

The RPM4-AD Hi Q-RPT module has a VENT port. The VENT port is connected to the Q-RPT
Self Defense System (SDS) Q-RPT vent valves. The VENT port should always be left completely
unobstructed and open to ambient atmospheric pressure.
RPM4-AD Lo Q-RPT module has an ATM port. The ATM port is connected to the RPM-AD
internal barometer. The VENT port should always be left completely unobstructed and open to
ambient atmospheric pressure. When operating RPM4-AD A160K/A160K in parallel gauge
pressure mode to measure airspeed, the vent port may be connected to the DUT Ps or
altitude port to assure that the RPM4 and the DUT are at the same altitude setting. In this
case, altitude must remain between -700 and 3000 m (110 to 70 kPa abs).
See Section 5.6 for schematics of RPM4-AD TEST and VENT ports, Q-RPT and internal
valve configurations.
NEVER plug, obstruct or connect a supply pressure to an RPM4-AD VENT port. This will
adversely affect GAUGE mode operation and AutoZeroing functions.
2.3.7

CHECK/SET SECURITY LEVEL

RPM4-AD has a security system based on user levels. By default, the security system is set
to "low", which includes access restriction to internal calibration coefficients, and there is no
password required to change the security level. See Section 3.5.5.5 for information on the
security level system. As part of the RPM4-AD startup, determine the security level that is
appropriate for the RPM4-AD and set a password if desired.
RPM4-AD is delivered with the security level set to "low" to avoid inadvertent altering of
critical internal settings but with access to changing security levels unrestricted. It is
recommended that the low security level be maintained at all times and password
protection be implemented if control over setting of security levels is desired.
2.3.8

SDS FULL TIME OFF

RPM4-AD includes the SDS Self Defense System on both its TEST ports to shut
them off from a pressure connected to them when they are not in use. If this
function is not desired, SDS can be turned full time off so that in regular
operation, SDS is not present. With SDS full time off, the SDS overpressure
protection is still active.
See Section 3.5.4.2 for instructions on turning SDS full time off if desired.
Page 9 © 2005-2007 DH Instruments, a Fluke Company
2. INSTALLATION