10/4/2007 phone: (215) 947-2500 fax: (215) 947-7464 e-mail: [email protected] web site: www.televac.com
4
CHAPTER 2
(cont.)
TELEVAC
Safety Instructions (cont.)
`
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.
Principles of Sensor Operation
CHAPTER 3
Thermocouple Gauge
The 2A thermocouple gauge tube consists of a metal shell containing fine wire filaments of dissimilar
metals, which form a thermocouple. The thermocouple gauge measures absolute pressures by
determining the temperature of a heated wire as the surrounding pressure changes. The response of the
sensor depends on the gas pressure and type.
The range of these sensors is, 1 to 20,000 microns, (1 X 10-3 Torr to 20 Torr). The sensor housing is
constructed of stainless steel (or alternately nickel plated brass) capable of withstanding 150-psi
overpressure.
SUNSTAR传感与控制 http://www.sensor-ic.com/ TEL:0755-83376549 FAX:0755-83376182 E-MAIL:[email protected]
SUNSTAR传感与控制 http://www.sensor-ic.com/ TEL:0755-83376549 FAX:0755-83376182 E-MAIL:[email protected]
