Further Testing
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ADTS 405 R/F Mk2 Instruction Manual-English | 63
f.
Select
F1
. The display shows:
g.
Select
F1
. The display shows:
h.
When complete, press
CLEAR/QUIT
three times to reset the system.
6.8 Further Testing
Perform the following tests if a pneumatic leak or a controller instability is suspected.
6.8.1 Environmental and Preliminary Operations
Do the tests in a room with a stable temperature environment and within the operating
temperature range. The room must be free from drafts. Read the whole of the test procedure
before commencement.
Note:
The unit must be thermally stable; switch on and leave the unit for at least 1 hour
to achieve thermal stability.
Change the units to mbar as follows:
a.
Press
SETUP
then select [UNITS].
b.
Repeatedly select [NEXT] until the display shows “mbar”.
c.
Select [SAVE] and then press
CLEAR/QUIT
twice and the display now shows Ps and
Pt in units of mbar.
6.8.2 Pressure Leak Check
This check confirms that the unit does not leak under positive pressure conditions:
a.
Press
LEAK MEASURE/CONTROL
to enter control mode. The display shows “Aim” in
place of “Leak Measure”.
b.
Enter a Ps aim of 1016 mbar by pressing:
ALT/Ps, 1, 0, 1, 6, ENTER
.
c.
Enter a Qc aim of 272 mbar by pressing:
SPEED/Qc, 2, 7, 2, ENTER
. Wait for the aim
values to be achieved then wait for 1 min.
d.
Press
LEAK MEASURE/CONTROL
to return to Leak Measure mode.
e.
Press
RATE TIMER
and select [WAIT 05:00], [TIME 01:00]. Observe that the “Waiting”
time is shown on the display as it counts down, followed by the “Timing” time.
(SYSTEM)
F1 Vent System
F2 Set System Ready
F3 View Temperature
Going To Ground
PLEASE WAIT
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