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The amount of pressure can be expressed in units of _____
Pounds per square inch (psi), inches of water column (in. WC), inches of Mercury (in. Hg)
A draft gauge is used to measure the difference in draft pressure between the atmosphere and the furnace, breeching, or stack and is calibrated in tenths of a(n) _____
Inch of water column
A _____ thermometer uses a strip of two metal alloys with different coefficients of thermal expansion that are fused together at the ends
Bimetallic
A(n) _____ is an instrument consisting of a cylinder, heavier than the liquid in which it is immersed, and a torsion device that measures its weight
Displacer
A(n) _____ flow meter measures the pressure drop across a pipeline flow restriction, which varies with changes in the flow rate
Differential-pressure
A _____ measures the electrical conductivity of liquids and consists of two electrodes immersed in a solution
Conductivity meter
A(n) _____ analyzer is used to measure the excess oxygen content
Zirconium Oxide
A(n) _____ is an audible alarm that is created electrically or electronically
Annunciator
A(n) _____ provides the power and motion needed to manipulate the moving parts of a valve or damper
Actuator
A(n) _____ device is a human-machine interface used to control the actions of a system or computer
Programming
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