MEDICAL GASES Administration, Regulator, Flowmeter

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MEDICAL GASESAdministration, Regulator, Flowmeter

• First Year Respiratory Therapy
• MJC RsCr 220

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Flowmeters
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Types of Flowmeters

• Wall flowmeter
• DISS or Quick Connect
• Thorpe tube (99) / Bourdon
• Backpressure compensated
• Cylinder (flowmeter) Regulator
• ASSS or Pin Index
• Regulator based on bourdon gauge (99)
• Actually calibrated to measure pressure

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Wall Flowmeters

• Stay in one spot dont travel well

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Flowmeter Characteristics

• Bourdon Gauge
• Can be placed any direction
• Can be fooled with kinking or backpressure
• Thorpe Tube
• Must be upright

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FLOWMETERwith thorpe tube

• Read flow
• in middle of ball
• Low pressure (50 psi)
• calibrated

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Two opposing forcesGravity vs Flow
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The Ball in the Thorpe Tube
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Back-Pressure Compensation
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ALL are now compensated
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You can tell

• The ball in the thorpe tube will pop up when
  the tank is opened or the flowmeter is attached
  to the wall.

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Special Calibrated Flow Meters

• Some flowmeters are High-Flow
• Calibrated for flows 0 to 80 L/min
• For special duty aerosol nebulizers
• Some flowmeters are Low-Flow
• Calibrated for flows 0.1 to 0.9 L/min
• For neonates and newborns

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Regulators

• Reduce Pressure
• Measure Pressure (in tank)
• Measure flowrate

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Reducing Valve

• Internal part of a regulator
• Reduces gas pressure to safe levels
• There are preset and adjustable valves

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Flow Restrictor

• The simplest flow metering device
• Incorporated into oxygen devices

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Regulator

• Main body
• reduces pressure
• from high to low
• (2,000 psi to
• 50 psi)

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Some even are Dual Stage Regulators
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Pressure Relief Valves

• In main body
• IF pressure gets excessive
• Will release extra pressure and stop tank from
  exploding
• Different types of valves

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Regulators Review

• Is a combination of
• a reducing valve
• Pressure Gauge
• A flowmeter will meter out the gas in the tank
  at a precise rate

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Two Different Regulators

• ASSS Regulator
• Pin Index Regulator

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A.S.S.S Regulator

• American Safety
• Standard System
• Treaded
• High pressure
• Large tanks

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Pin Indexing

• Pin Positions
• High Pressure
• Small tank (E)

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Biggest Leak Cause

• The missing
• washer

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Bourdon Gauge in Regulators
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Back Pressure Problems
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Bourdon Gauge
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Bourdon Gauge measures pressure and converts to
flow.
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Look out for backpressure

• You can get false readings from some types of
  flowmeters with kinking of the line or
  backpressure resistance.
• Bourdon Gauge
• Non-Backpressure Compensated Thorpe Tubes

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The End

• Im not worried.
• If Im not smart
• enough for a good
• job, I can always
• teach.