Page 159 - Instrumentation Reference Book 3E

Further reading 143

for pressure and temperature, continuous samples,
Transducer
and sample and hold. Up to 100 samples per second
PreSSWe Temperature can be obtained with special burst sampling com-
signal signal mands. The internal serial bus communicates
with the outside world by means of a digital field-
bus connection, such as Profibus or Foundation
1"T'l:" frequency Fieldbus.
, J 9.4 References
EPROM
Microprocessor
An Introduction to Process Control, Pub. 105B, The
A I Foxboro Company (1986)
Busse, D. W.. "Quartz transducers for precision under
RS485 pressure," Meclianical Engineering, 109. No. 5 (May
1987)
Gillum. D. R., Industrial Pressure Measurement, Instru-
ment Society of America. NC, USA (1982)
RS485 RS485 Hewson, J. E., Process Instruinentation Manifolds: their
IN OUT
Selection and Use, Instrument Society of America,
RS232 IN RS232 OUT NC. USA (1981)
interface
Lyons, J. L., The Designer's Handbook of PI-essure-Sen-
Figure 9.46 Digital interface board. Courtesy, sing Devices, Van Nostrand Reinhold, New York
Paroscientific Inc. (1980)
Neubert, H. K. P.: Instruinent Transducers: an Introduc-
time, baud rate, pressure adders, and pressure tion to their Perforinance and Design, Clarendon
multipliers. Resolution is programmable from Press, Oxford (1975)
0.05 to 100 parts per million; depending on sys-
tem requirements. Baud rates up to 115.2K baud 9.5 Further reading
can be selected. Pressure data are available in
eight different or user-defined engineering units. British Geotechnical Society, Pressuremeters, American
The command set includes single sample requests Society of Civil Engineers, New York (1990)