introduction to basic principles
Post on 31-Dec-2015
45 Views
Preview:
DESCRIPTION
TRANSCRIPT
Introduction to Basic Principles
Types of Level Measurement
1. A STICK/SOUNDING TAPE/SITE GLASS2. MECHANICAL FLOATS3. CAPACITANCE4. HYDROSTATIC PRESSURE5. RADAR/SONAR
Typical Level Sensors
Hydrostatic Pressure
• PRESSURE-FORCE/AREA• Water Column• Density and Specific
Gravity• P=h*SG/27.68• Sensor Ranging
Pressure vs Volume
0 5 10 15 20 25 300
500
1000
1500
2000
2500
3000
3500
4000
volume
height
volu
me
0 5 10 15 20 25 300
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
psi
psi
height
pres
sure
Pressure is a
function of height
Volume is a function of shape
• Dimensions• Calibrations• Sounding Chart• Application nData Sheet
Scale Calculations
4-20mA Basics
• Can be run long distances with minimal loss ~1,000 ft+
• Varying impedance or supply voltage will not affect the signal.
• Low electromagnetic susceptibility• Only requires 2 wires to operate
Typical 4-20mA Loop
Remote Indicator Loop
KING Filters
• Single stage or dual stage• Main Line or Point of use• Polisher Selection• Scrubber Selection
Coalescing Filtration
• Compressed air enters• Travels through filter media• Oil and water attach to
fibers• Grow into droplets and fall
off into bowl• Replace elements yearly or
as needed
King’s Outside to Inside Flow
• More surface area for particulate
• Nozzle shaped outlet for better discharge
Removing Oil/Water Vapor
• Using desiccants to remove vapor through adsorption
Desiccant Dryers
• Compressed air passes through an adsorbent media (desiccant) such as activated charcoal, silica gel, or molecular sieve.
top related