MKS Baratron 631D, Instruction Manual, Page: 42 / 64

Chapter Three: Overview
34
Table 6: Pinout of the Interface Connector (J1)
Pressure Output
The 631D transducer provides a 0 to 10 VDC output signal at pressures of 100% of its full-scale
range and below.
Overpressure Considerations
As with any transducer, the 631D transducer performs valid measurements up to the unit’s Full
Scale. At pressures of roughly 10% over the Full Scale range, a high (≥ 11 VDC) output signal is
produced to warn of invalid readings. This high output signal varies from device to device, and is
not linear with further changes in pressure. At pressures somewhat beyond 110% of the Full
Scale range, the diaphragm touches the fixed capacitor plate. The capacitor plate serves as a
protective overpressure stop to prevent damage to the diaphragm up to 45 psia for an absolute
transducer.
Note
The output signal of the 631D above its full-scale measurement range is
not linear or repeatable, and should not be used for quantitative
measurements or process control. MKS does not guarantee that the
product will meet any of its published performance specifications above
110% of its full-scale range.
Labels
Three labels appear on the 631D unit: a wiring diagram label, a “Danger Hot” label, and a serial
number label.
Wiring Diagram Label
Figure 5: Wiring Diagram Label
The wiring diagram label shows how to connect a single or dual power supplies to the 631D unit.
Refer to Figure 5: Wiring Diagram Label, page 34, for the location of the label on the 631D unit.