Small overpressure effect repeats within 0.01% full scale after being exposed to 35
psia
Stable zero reference
Fully temperature compensated
High resolution to better than 0.01% full scale
True total pressure reading independent of gas composition
High level DC output 0-10 volts, full scale
Description
The Barocel 622 is field proven bakeable capacitance manometer vacuum/pressure
transducer. The signal conditioning electronic components are separated
from the sensor, allowing it to be operated at 200°C as required by
some applications. Among these applications are processes involving condensable
gases, some nuclear processes, and those requiring high temperature sterilization.
The sensor employs the same high performance features found in the Model
600. A temperature sensor within the transducer head provides zero sensitivity
compensation to maintain accuracy over a wide temperature range. Removable
connectors at the electronics package help simplify installation. An integral
vacuum reference of all-welded construction contains gettering material
to ensure long term stability and eliminates the need for reference vacuum
pumps.
In vacuum systems, the Model 622 is the solution where traditional instruments
such as McLeod, Pirani, or thermocouple gauges are unable to operate. Since
pressure is sensed by displacement of a thin metal membrane, calibration
accuracy is unaffected by the chemical composition of input media.
Dirty, corrosive and radioactive gases such as tritium may be monitored
without affecting accuracy because the electrically active portion of the
sensor is contained in the sealed vacuum reference which is isolated by
the taut metal diaphragm.
The transducer's analogue output is linearly proportional to pressure, and
may be recorded by data acquisition systems, read directly on a high-resolution
digital voltmeter, or by Edwards power supply/readouts.
Technical
Data
Pressure ranges:
0-10, 0-100, 0-1000 torr 0-10, 0-1000, 0-1000
mbar Ranges to 10,000 torr also available
Overpressure effect:
Repeats within 0.01% full scale after 35
psia exposure
Accuracy:
0.15% of reading standard, 0.5% of reading
also available
Material exposed to pressure
media:
Inconel and Monel
Resolution:
Better then 1:104
Internal volume:
8.3 cm3 including 1/2” dia.
tube
Operating temperature:
0 to 200°C (sensor)
0 to 65°C (signal conditioner)
Time constant:
8 msec
Temperature effect on
zero:
Less than 0.005% full scale /°C
Output signal:
0-10 VDC, linear with pressure
Temperature effect on
sensitivity:
Less than 0.02% reading /°C
Power requirements:
15 VDC ±5% regulated to
± l % at 30mA
Overpressure without damage:
1.25 times full scale range or 35 psia,
whichever is greater
RFI suppression:
Standard on all models
Weight:
2.9 lb (1.3 kg)
Displays
and Controllers for use with the model 622
