PIM 417-O
PITOT-STATIC LEAK TESTER TYPE D51600
Issue 5
November 2009
Page 11
OPERATION
1. INTRODUCTION
The PSLT is designed to perform the following basic functions:
A. Positive and negative pressure generation
B. Differential pressure measurement
C. Pressure rate control
D. Control of Set Point pressure
E. Accurate measurement of external leak: rate
F. Automatic timing during tests.
Throughout the operations cycle, the PSLT Built-In Test Equipment (BITE) carries out self-diagnostic
checks to accurately assess the output states of the battery and the Transducer dedicated supply. It
also monitors pressure to detect an Overpressure condition, initiating an automatic vent if one is
detected.
All PSLT functions can be accessed and controlled via menu screens and the front panel keypad, see
Figure 3
.
Figure 3 PSLT Front Panel
Six membrane keys are provided:
A.
PWR
Applies power to the equipment.
B.
+
Nudges parameter values by set increments.
C.
-
Nudges parameter values by set decrements.
D.
SEL
Selects menu option; Pitot or Static mode of operation; and the preferred measuring
units for each test or pressure control sequence. Is used within a test to skip from one
stage to the next. In Pressure Control Mode is used to toggle between the pressure
monitor and leak rate displays.
E.
START
Initiates all tests and pressure control sequences. When pressed in conjunction with
the PWR key during power up, gives access to a Maintenance Mode.
F.
STOP
Aborts the test and initiates a Vent Cycle.