40
»0«:
hot cathode disabled, hot cathode sensor remains switched-off
»1«:
hot cathode enabled, start of hot cathode sensor is controlled automati-
cally (default)
With disabled hot cathode sensor the VSH behaves like a Pirani transducer with
range 1000 - 1.0x10
-4
mbar. Below 1.0x10
-4
mbar the serial interface sends an
»UR« signal for pressure underrange.
The degas function cannot be started while the hot cathode sensor
is disabled.
Parameter »Cathode Control« is only temporarily saved in the
transducer memory. After mains supply is switched off or dis-
connected the VSH will always be reset to state »hot cathode ena-
bled«.
Filament Control (FC)
(Not accessible via Profinet)
The Bayard Alpert hot cathode sensor of the VSH is equipped with two heating
filaments. This parameter defines in which manner these filaments will be used:
»0«:
filament 1 active, in case of a defect the sensor will switch to filament 2
(default)
»1«:
only filament 1 will be used
»2«:
only filament 2 will be used
»3«:
filaments 1 and 2 will be used alternately. I.e. when the hot cathode
sensor is switched off the other filament will be activated at restart of
the sensor.
Filament Number (FN)
With this parameter you can check whether filament 1 or 2 of the hot cathode sen-
sor is currently activated.
Filament Status (FS)
This parameter is used to check the failure status of the hot cathode sensor:
»0«:
no error, filaments 1 and 2 ok
»1«:
filament 1 defective
»2«:
filament 2 defective
»3«:
filaments 1 and 2 defective
VSH-Profinet-200116
Summary of Contents for VSH87PN
Page 2: ......
Page 21: ...21 VSH Profinet 200116...
Page 24: ...24 8 Konformit tserkl rung VSH Profinet 200116...
Page 43: ...43 VSH Profinet 200116...
Page 46: ...46 8 Declaration of Conformity VSH Profinet 200116...
Page 47: ...VSH Profinet 200116...
Page 48: ...VSH Profinet 200116...
