INFICON BPG402-Sx ATM to Ultra-High Vacuum Gauge - Manual (Page 28)

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tina46e1-a (2010-03) BPG402.om
The status of the dual filament hot cathode is indicated by a LED on top of the
gauge.
Filament status indicator LED
Filament status Emission Filament status
indicator
– off dark
Both filaments O.K. on green
One filament broken on green, flashing
Both filaments broken on red
INFICON recommends the replacement of the sensor as soon as the
first filament failure has been detected (replacing the sensor
→ 44).
The BPG402-S, SL features a "Filament status" relay contact available at the
sensor cable connector:
Filament status Relay contact
(
→ diagram 19)
Both filaments O.K. closed
One filament broken open
Both filaments broken open
The filament status can be read via the serial interfaces:
Gauge Interface Detailed information
BPG402-Sx (all versions) RS232C → 31
BPG402-SD DeviceNet → [1]
BPG402-SP Profibus → [2]
In automatic mode (AUTO) (default) the gauge automatically alternates between
filaments in order to age both filaments evenly. However, in manual mode (MAN),
filament selection can be commanded via the interfaces.
The filament control mode can only be changed via the interfaces
(
→ 30, [1] and [2]).
4.5 Filament Status
4.5.1 Filament Status Indicator
4.5.2 Filament Status Relay
(Only BPG402-S, SL)
4.5.3 Filament Status via
Interface
4.6 Filament Control Mode