Fluke RPM4-AD, Руководство по эксплуатации и обслуживанию

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RPM4-AD™ OPERATION AND MAINTENANCE MANUAL
© 2005-2007 DH Instruments, a Fluke Company Page 64
3.5.4 <4SDS>
 PURPOSE
To open and close SDS temporarily or to turn the SDS function ON and OFF full time.
See Section 3.2.8 for complete information on RPM4’s SDS (Self Defense System) feature.
 PRINCIPLE
SDS is a self defense system to protect RPM4-AD Q-RPTs from overpressure (see Section 3.2.8).
Normally, opening and closing SDS is performed automatically by the RPM4-AD or by the operator
using the
[SDS] key.
[SPECIAL] , <4SDS> gives further control over the SDS function. This includes:
a) temporarily opening or closing SDS on either the Hi or Lo Q-RPT (see Section 3.5.4.1), and; b)
turning OFF SDS so that it is open full time and RPM4-AD can be operated as if SDS were not
installed (see Section 3.5.4.2).
The temporary opening or closing of SDS allows the SDS open/closed state to be set to the desired
state immediately. Following the change, normal automated operation of SDS and control using the
[SDS] continues. This function is often used to open SDS on the inactive Q-RPT.
Setting the SDS function to full time OFF eliminates the SDS function completely for both Q-RPTs
(except for reaction to an overpressure condition) until SDS is set to full time ON again.
3.5.4.1 <1TEMP OPEN/CLOSE>
 OPERATION
See Section 3.2.8 for complete information on RPM4’s SDS (Self Defense
System) feature.
To temporarily open or close the SDS of the Hi or Lo Q-RPT press [SPECIAL] ,
<4SDS> , <1temp open/close> . Select the Hi or Lo Q-RPT. The next display is:
The cursor is on the current state of SDS for the
designated Q-RPT. Select
<1close> to close
SDS or <2open> to open SDS and return to the
MAIN RUN screen. Press [ESC] to return
without making changes.
SDS temporary: Hi
1close 2open
If <2open> is selected and SDS for the Q-RPT is not already open, the SDS
opening screen with indication of the maximum pressure of the Q-RPT is displayed.
This is the same screen used when opening SDS using the
[SDS] key (see
Section 3.3.8). Check that the pressure applied to the Q-RPT module TEST port
does not exceed the Q-RPT’s Pmax! value before confirming that SDS should be
opened.
SDS temporary open and close in parallel measurement mode (HL)
In parallel measurement mode (HL Q-RPT), the active TEST port is the
TEST(Ps) port in absolute measurement mode and the TEST(Pt) port in gauge
measurement mode. Opening SDS using [SDS] opens the active TEST port and
the internal bypass valve between the two Q-RPTs (see Section 5.6 for
schematics and valve states) while the inactive
TEST port is left closed. Closing
SDS using [SDS] closes the active TEST port amd the internal Q-RPT bypass
valve. When SDS is open, SDS temporary open can be used to open the