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
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| 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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- 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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