Deluxe Wind Damping System to Stop Gauge Needles Moving

If the room pressure gauge fluctuates more than 1 Pa due to the wind and the standard two tube damping system does not reduce them sufficiently then the optional wind damping system may be more effective. The time constant of the system is designed to decrease swings due to wind.

If swings are due to other causes the wind damping system may not help.

Place the Deluxe Wind Damping System case on the ground/floor outside the room or building to be tested. If it has not been stored at the ambient outside temperature, leave it for half an hour to acclimatise before starting the test. DO NOT let the sun or any other heat source beat on the capacity tank.

Plug the RED tube coming from the panel into the smallest connector (of the five) on the back of the capacity tank.

Place the wind damping system in a box and close it up. The box must be on the opposite side of the doorway from the pressure gauges and away from the air blast of the door fan and the wind. This is very quick and often sufficient to stop fluctuations.

Observe the gauges. If still fluctuating more than 1 Pa, attach CLEAR tubes (in any combination of lengths) to each of the four 900 connectors on the back of the capacity tank. Lead the CLEAR tubes to areas around the enclosure as far away from the walls as possible. Lay the tube flat on the ground and cover the ends with cardboard to stop air movement at the end of the tube. DO NOT seal the tube ends.

Observe the gauge needle for at least 30 seconds with the blowers off to ensure wind effects are understood then turn on the blower to establish the required pressure. Again, observe for at least 30 seconds. Some experimentation may be necessary to get the best gauge readings.

CAUTION: Do not allow tube ends to dip into water because this will seal them off.

If the wind fluctuations are still too great.

Increase test pressure so the wind fluctuations are no more than 20% of measured pressure. Do not try to measure the static pressure at time of door fan test. Call it zero.

Take the room to the same positive and negative test pressure. Observe the readings for 60 seconds and take the average.

This procedure will give a slightly (5 to 20%) greater leakage area than a no wind test which will reduce the retention time by 5 to 20% making the test failsafe.

2000 Fire Door-Fan Manual

updated 2002-05-28

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Canon 2000 manual Deluxe Wind Damping System to Stop Gauge Needles Moving
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2000 specifications

The Canon EOS 2000D, also known as the Rebel T7 in some regions, is an entry-level DSLR that caters to beginners and amateur photographers looking to explore the world of digital photography. Launched as a successor to the EOS 1300D, the 2000D brings a host of features and technologies that make it an appealing choice for those stepping up from smartphone photography.

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