Section 6 - Pressure Instruments: Level Applications
Call Kai
Learn
Practice Test
Spaced Repetition
Match
Flashcards
Knowt Play1/40
There's no tags or description
Looks like no tags are added yet.
Name | Mastery | Learn | Test | Matching | Spaced | Call with Kai |
|---|
No analytics yet
Send a link to your students to track their progress
41 Terms
Gage pressure is referenced to ____
Atmospheric pressure
Accessories are used to ______ and ______ the instrument
Protect and Isolate
Siphons protect the bourdon tube from _____
high temperatures
Siphons are used for what service?
Steam service
Siphons are also called...
Pigtails
Snubbers are placed _____ the process inlet and gauge.
Between
How do snubbers reduce pulsations?
Restricting flow
Snubbers should ____ be used with any instrument installed specifically to measure high frequency pulsations.
Not
Chemical seal ensures that the process fluid ____ goes in DP cell
never
Chemical seal purpose:
Protects sensor from plugging, damaging, and freezing
What are chemical seals filled with?
Non-compressible liquids
How does air trapped in the chemical seal affect pressure reading?
Results in a lower pressure reading
Why are Bellow Chemical seals better for higher pressure?
Allow for more movement
What is the first step in calibrating a Pneumatic PT?
Ensure cell is clean and dry
When calibrating an Electronic Gauge Pressure Transmitter, what is the next step after ensuring the cell is clean and dry?
Check jumper position
What conditions must be met when installing a pressurized DP cell?
1/2" tubing, block valve, install below connection point, bleed lines
How is the high side connected to an open tank?
Bottom of tank
How is the low side connected to an open tank?
It is vented
How is the low side connected to a closed tank?
Top of tank
Dry Leg means the line sensing the air / gas pressure at the top of a closed tank has...
No liquid in it
Wet Leg means the line sensing the air / gas pressure at the top of a closed tank has...
Liquid in it
A dry leg is used when...
Process fluids will not condense in the leg
A wet leg is used when
Process fluids will condense in the leg
What does the condensate pot do in a dry leg application?
Condensate pools in the pot below the transmitter
What does a seal pot do in a wet leg application?
Maintains level of liquid in wet leg
Chemical seal and DP cell are not normally repairable on site as...
They are sold as a unit
Capillaries are filled with ____ ____ that will not readily freeze
silicon oil
Diaphragm chemical seals are used for _____ tanks
Atmospheric
Wafer and Extended diaphragm chemical seals are for ____ tanks
pressurized
Flat diaphragms are used when process fluid _______ plug piping.
will not
Extended diaphragms are used when process fluid _______ plug piping.
will
Wafer chemical seal is the same as a flat diaphragm but is a...
premade system
Extended chemical seal is the same as a flat diaphragm but is a...
premade system
When a small flow of liquid is constantly introduced into the connection between the DP cell and the process this is called a...
Liquid Purge
When a small flow of gas is constantly introduced into the connection between the DP cell and the process this is called a...
Bubbler system
In a bubbler system, the supply pressure must be a minimum of __ kPa higher than highest pressure.
69
Interface Applications have an overall ____ level
constant
What would you use when: open vessel, process is abrasive?
Flat diaphragm
What would you use when: open vessel, process plugs easily?
Extended diaphragm
What would you use when: closed vessel, process reactive to air?
Wafer chemical seal
What would you use when: closed vessel, fluid is corrosive?
Bubbler