Chapter Three: Overview General Information
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Chapter Three: Overview
General Information
Figure 11 shows the top view of the 640B Series Pressure Controller. The user adjustable
controls for zero, span, the P term, the I term, and the trip points are located on the top of the
controller. The trip point settings can be measured through two test jacks, located on the side of
unit, as shown in Figure 4, page 18.
Figure 12: Top View of the 640B Series Controller
Pressure Control Range
The 640B Series controller can control pressure over a range of 2% to 100% of full-scale. This
means that a 640B controller with a 1000 Torr transducer can control pressure from 20 to 1000
Torr, and a unit with a 100 Torr transducer can control pressure from 2 to 100 Torr.
Span
Pot
Zero Pot
Trip Point
Adjustments
Proportional
Adjustment
Integral
Adjustment
Trip Point
Status LEDs
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