B2 - Schoonover, Inc.

Bayard-Alpert Pirani Gauge BPG400
Vacuum Gauges
Advanced BPG400
The unique concept of the Bayard-Alpert Pirani Combination Gauge
eliminates the disadvantages of conventional technology and provides
unparalleled performance. The gauge consists of two sensing systems, a
hot ion sensor and a Pirani sensor, which signals are combined in one
single compact package.
The enclosed sensor tube with integrated grid protects the sensor from
external electrical fields. The optional baffle is recommended in case of
particles or process by-products possibly contaminating the sensor or when
freak ions, stray light or fast electrons could influence the measurement.
The Pirani sensor automatically controls the switching on and off of the hot
ion sensor at a defined switching threshold. The filament therefore is
protected since the hot ion sensor is switched off instantaneously in case of
an air inrush. This minimizes problems associated with operator error,
extended signal processing time, and other system failures.
The electron bombardment degas function provides efficient cleaning of a
contaminated sensor. These measures as well as the yttrium oxide coated
iridium filament extend the lifetime of the gauge to its best. When the end
of the sensorÕs lifetime is reached, simply unplug the sensing element from
the electronics and plug in the replacement.
For higher bakeout temperatures the electronics can be easily removed
when no reading is required or the bakeout extension can be attached
between the sensor and the electronics when a reading is required.
B6
Withstands air inrush > 10,000 times.
The BPG400 eases the integration into process systems and reduces cost.
The combination gauge eliminates the need of two single gauges, which
saves one gauge, one port, one cable, tubing, flanging and converter parts.
The software integration is very easy and convenient since the output
signal is described by a simple formula, which reduces cost further.
B6.13