phone: (215) 947-2500 fax: (215) 947-7464 e-mail:[email protected] web site: www.televac.com
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CHAPTER 2
(cont.)
TELEVAC
Safety Instructions (cont.)
`
Principles of Sensor Operation
The convection gauge measures absolute pressures by determining the heat loss from a thermocouple
heated to a constant temperature by a current source. A second thermocouple compensates for ambient
temperature changes and extends the vacuum measurement range above 2 Torr by measuring the
convection effects.
The convection sensor must be mounted vertically for accurate measurements. Sensors are available in
stainless steel or nickel-plated brass and can withstand 150-psi overpressure.
Objects and Liquid Entry – Never push objects of any kind into this product through
openings as they may touch dangerous voltage points or short out parts that could result in
a fire or electric shock. Be careful not to spill liquid of any kind onto the products.
Do not substitute parts or modify instrument.
Because of the danger on introducing additional hazards, do not install substitute parts or
perform any unauthorized modifications to the product. Return the product to Televac for
service and repair to ensure that safety features are maintained. Do not use this product
if it has unauthorized modifications.
CHAPTER 3
