Calibration Plates for Duct Testing System

Retrotec Blower Doors for Residential Door Fan Industry

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Calibration Plates

Retrotec’s Field Calibration Plate for duct testing systems gives you an easy, five minute test to verify the accuracy of your duct testing system. Performing this test monthly will allow you to detect calibration problems early and fix them before they become serious.

The field calibration plate is compatible with Retrotec’s Q32 and R31 duct testing systems. It is also completely compatible with the Minneapolis Duct Blaster.

Diagnosing Common Problems:

Retrotec's Field Calibration Manual provides a detailed checklist for each of the following common issues.

Problem:	Frequency of Problem:	Typical Error:	Details:
Wrong Range Configuration or Device	Constant	-80% to +400%	Setting the Digital Gauge to the wrong Range Config or Device is the most common error. Often occurs just after a change of Range or Device.
Tubing Connections incorrect	Sometimes	20%	Especially for pressurizing houses and depressurizing ducts, tubes are hooked up incorrectly most of the time.
Plugged tubes	Seldom	20% to 200%	Wide range of errors but not very common.
Leaking tubes	Less Seldom	10% to 50%	Wide range of errors but not that common. Usually the pressure source will restore some leaked-away air, but if excessive, pressure indications will fall.
Flex duct leaking	Slow Degradation	1% to 25%	Very common but small. Always there to some degree. This procedure will identify a leaking duct so it may be patched with duct tape.
Gauge channels read differently	Rare	1% to 20%	One of 2 channels reading differently. Uncommon, but could be a big error. If both channels have an identical error, the effect on the result is negligible.
Gauge won’t zero	Rare	1% to 5%	One of 2 channels reading differently. Uncommon, but could be a big error. If both channels have an identical error, the effect on the result is negligible. It is the difference between the channels that causes the errors.

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	Fire & Enclosure Testing
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