D U N I W A Y S T O C K R O O M C O R P .
W W W . D U N I W A Y . C O M
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Operation
A. Turn Power On
The loudspeaker will “beep” and all indicators will light for a few seconds while the controller
executes its self test. After the self-test, the display will show:
- the model number, e.g.
906
,
- the software version, e.g.
1.20
for a second;
- then it will display the units of measure, torr or mbar, e.g.
TOR
or
BAR
for one second
- then the sensor curve chosen,
275
or
CEP
.
The 906A will then begin measuring pressure. If the gauge cable is not connected, the display will
show
OFF
. If the system pressure is greater than 990 Torr (mbar) or if the gauge is disconnected
from the cable, the display will show
HI.
B. Choice of Model 317 HPS/MKS CEP or Model 275 Convectron
®
Response Curves
Default:
G-P Model 275 Convectron
®
(“275”)
The “CEP” tube and the “275” tube have slightly different response curves over the 7 decades of
pressure indication. In order to provide the most accurate pressure indication, the user is offered
the choice of response curves, depending on the sensor tube chosen.
To change from “275” to “CEP” response curves, unplug the 906A from its power source. Press
and hold
RAISE and SELECT
buttons at the same time; while holding the
RAISE
and
SE-
LECT
buttons depressed, plug the power cord in. You will hear a two short ‘chirps’ from the
loudspeaker confirming the response curve has been changed. The digital display will show
CEP
to confirm the reset has been entered. This process can be reversed by following the same proce-
dure. The unit will be returned to the 275 response curve during Reset of Stored (Default) Values.
C. Calibration
You can set the zero point of the display or calibrate it to atmospheric pressure; in addition, you
can recover the factory settings. These calibrations use the
SELECT
,
RAISE
and
LOWER
buttons.
D. Setting to Zero
The system pressure should be lees than 1 mTorr (1µbar).
Press the button labeled
SELECT
. You will hear a short ‘chirp’ from the loudspeaker and the
VAC
LED
will flash; you may now use
RAISE
and
LOWER
to set the pressure to zero. The actual pressure
must be less than approx. 50 mTorr (65 µbar); if you try to set zero pressure when the instrument
is greater than 50 mTorr (65 µbar), you will get a long beep from the loudspeaker.
TELEPHONE: 650-969-8811 TOLL-FREE (U.S. only): 800-446-8811 FAX: 650-965-0764 EMAIL: [email protected]
www.duniway.com
