Edwards APG200

If the mul-funcon
buon being held down for more than 1 minute, the LED indicator
turns solid red. The pressure measurement output signal and setpoint are unaected.
When the buon is released, the LED indicator turns green signifying normal operaon.
In the case of lament and calibraon errors, the output voltage will change to signify
the error condion and will latch unl the condion is reced and the power to the
gauge is cycled. The setpoint will addionally switch o in the event of calibraon and
lament errors. Refer to Fault nding on page 39 for details of how to remedy the
situaon.
Table 19 Error indicaon
LED indicaon
Meaning Cause
Error voltage
Colour
Change rate
On (s) O (s)
Red
0.25 0.25
Filament error Filament broken; tube not
fully inserted
Refer to Table: Per-
formance data
0.7 0.7
Calibraon er-
ror
Calibraon could not be
achieved
NA
Buon error Buon stuck; held down
too long
N/A
Note:
If you use our con
troller, an error message is shown on the display.
5.6 Bakeout
In some UHV applicaons it is desirable to bake the vacuum system components to
achieve a lower base pressure. The tube of the gauge can be baked to 150 °C but the
electronics housing must be removed.
▪ Refer to Figure: Replac
e the gauge tube, remove the electronics housing.
▪ Bake the tube on your vacuum system. Do not exceed 150 °C.
▪ Allow the tube to cool before reng the electronics housing.
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