Engineering News article 29-08-2014

SA Gauge
PUBLISHED 29 AUG 14
SA Gauge is a manufacturer and
supplier of pressure and temperature
measurement instrumentation, with
branches in Durban, KwaZulu-Natal
and Kempton Park, Gauteng.
The company, which recently
celebrated its twenty-second year of
designing and manufacturing pressure
and temperature gauges for industry,
manufactures its products to
international and original-equipmentmanufacturer
(OEM) standards.
SA Gauge specialises in delivering
products to special OEM requirements
within short lead times. Special dials and ranges can typically be manufactured in two days. Customer
logos are designed and printed in-house, ensuring quick turnaround times.
Using conventional, computer numerically controlled machining centres and a range of hydraulic and
eccentric presses, the company manufactures parts for the instruments and related accessories in-house,
ensuring that all parts are available on time, when needed.
Besides pressure gauges and thermometers, the company also manufactures a range of related
accessories, such as diaphragm seals, pressure testing kits and related equipment for the accurate
measurement of pressure and temperature in the industrial, mining, chemicals, hygiene and process
industries.
Modern chemical processing and process manufacturing procedures demand greater accuracy and
reliability from their pressure measuring instruments. To reduce costs, production downtime must be kept
to an absolute minimum. ln some applications where there are chemical or hygiene considerations, it is
necessary to isolate the pressure measuring instrument, usually a gauge or a transmitter, from the process
medium.
This isolation is achieved by using a pressure-sensitive diaphragm made from a material resistant to the
process medium enclosed in a system fitted to the base of the instrument.
10/16/2014 Engineering News - SA Gauge
http://www.engineeringnews.co.za/print-version/sa-gauge-company-profile-2014-08-29 2/2
Diaphragm seal accuracy at 20 ºC may vary from 0.5% to 1% according to the chemical seal. These
values must be added to the accuracy class of the indicating instrument. The accuracy of vacuum,
however, cannot be guaranteed beyond –0.85 bar in the standard executions. This is due to the fact that
most filling fluids contain microscopic amounts of air or trapped gases, which tend to expand significantly
as a pressure of absolute zero is approached. This expansion affects the measuring element in the
instrument.
The diaphragm is an elastic measuring element. It can be manufactured out of different materials such as
stainless steel 316, hastelloy, tantalum or other materials, and, if required, it can be provided with various
protection foils or coatings to ensure compatibility with almost any kind of medium.
Contact SA Gauge to assist with technical requirements and questions.
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