Pressure sensors Installation Method

In This Sensor Installation Method Article Series , Today we are going to discuss about Pressure sensors Installation Method , Sensor's Installation Method Series Part-2

Pressure Sensor's

Pressure  General

• Pressure sensors are affected by orientation (see manufacturer's installation instructions).

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• Pressure tubes must be provided with an isolatable T-fitting near the device head for test purposes.

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• To prevent overload on one side when making adjustments, the connection must always be fitted with an isolating bypass.

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• Where there is a risk of condensation, the differential pressure tube must be installed at a gradient of 1:30 and fitted with a drain mechanism. 

• The drainage point must be lower than the device head and sensing point. 

• Protect from frost and avoid U-shapes.

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• Pressure tubes containing circulating air must not be introduced into the open air or routed through cold rooms or ducts. 

• This prevents the risk of condensate freezing in the tubes (e.g. with pneumatic venting sensors).

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• Mount on a vibration-free surface.

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• The pressure-tapping point must not be located in turbulent air. 

• Ensure sufficiently long settling zones upstream and downstream of the tapping point. 

• A settling-zone consists of a straight section of pipe or duct, with no obstructions.

 

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Pressure Air

• The measuring tip is screwed or glued to the duct wall. 

• Seal to protect from external air. 

• Remove any swarf from the inside of the duct.

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• Protruding fixing screws will impair correct measurement.

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• Correct installation.

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• Avoid using tips which protrude into the duct for static pressure measurements.

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• Probes are used to measure static pressure in the duct. 

• Must be installed parallel to the flow and either with the flow or against it.

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• Sizing the pressure tubes ('measuring tubes') for air and gases.

• Keep the tube as short as possible.

• An internal diameter of 4 mm is sufficient for pressure tubes of up to two meters in length.

• For longer pressure tubes, the internal diameter should be as indicated in the diagram.

• (Example: A pressure tube of 6 m requires an internal diameter of 6 mm.)

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• Connect the sensor and measuring instrument to the same point.

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• The tapping point must not be located where it will be affected by obstructions to the flow.

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• Where more than one sensor is used, the sensors should be installed on the same plane in the flow, and not in a position where one device will obstruct the air flow to the other.

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• dg = Equivalent diameter, Leave sufficient clearance downstream of any obstacles.

 

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Pressure Room

• The end of the pressure tube leading into the room should be protected by an air permeable cover. 

• Seal gaps between cable/plastic tubing and conduit. 

• Otherwise measurements will be falsified by incorrect circulation of the air.

 

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Options:

• Calculate average based on pressure measurements taken on several facades. 

• Measure pressure in an open space (min 1.5 m above ground level). 

• Multiple sensing point on flat roof.

 

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Pressure Outside air

• Measure the outdoor pressure in an area sheltered from wind. Individual facades are not suitable measurement locations, as the pressure varies according to the wind direction.

• The correct location for measurement is a place where the air can circulate freely, such as a flat roof. 

Note : however, that the sensing point must be fitted with a wind shield.

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Pressure Liquids

Pressure tapping point:

• Sensing hole: diameter 5 mm, drilled and deburred.

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• Smooth interior (no burrs).

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• Use a damping coil to avoid transferring vibrations.

• Bend a 1 m long copper pipe, 4.6 mm in diameter, into a spiral with loops with a diameter of 15 cm.

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Wrong: Air bubbles and condensate remain trapped.

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Wrong: Condensate cannot be drained.

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Pressure measurement in conjunction with liquids :

• Do not measure at the top of the pipe (trapped air or air bubbles) or at the bottom (dirt).

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• The correct location for a sensing point is at the side.

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Condensing gases

• Measure at the top to prevent condensate from entering the pressure tube.

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Installation in conjunction with liquids:

• Always install the pressure sensor in a location which is lower than the sensing point.

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Installation in conjunction with vapours/gases

• Always install the pressure sensor in a location which is higher than the sensing point.

  

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