MKS Baratron 631D, Instruction Manual, Page: 34 / 64

Chapter Two: Installation
26
Sensor
The 631D transducer can be installed in any orientation as long as the inlet tube is not facing
upwards. However, for best results, it is recommended that the Px port of the unit face downward
(as shown in Figure 1) to reduce the chance of contaminants entering the device and degrading its
performance. The sensor is zeroed at the factory in the vertical orientation (shown in Figure 1).
You should zero the unit again after installation, following the steps in
How To Zero the Type
631D Transducer , page 37.
If you anticipate vibration, orient the plane of the diaphragm parallel with the major oscillating
axis. The edge of the diaphragm is indicated by the dashed line in Figure 1.
Note
If vibration causes the unit to be oriented such that the Px port is not
facing downward, you must decide the best orientation for optimum
performance.
Figure 1: Recommended Orientation of the Type 631D Transducer
Note
Consult the MKS Applications group if your application requires a
1 Torr full scale transducer and you cannot position the 631D transducer
vertically.
Edge of the
Sensor
Diaphragm
Px Port