Variable pitch pulleys are adjusted by half cycle and each half cycle represents an operating position. Our Pulley GPS is used to measure the operating position of a variable pitch pulley. It comes with a chart.
With that chart, you can accurately determine the airflow of a fan:
• In all the operating positions within a pulley
• Size of replacement pulley if necessary
• Operating position in the replacement pulley
• Size of the belt at all operating position.
The Pulley GPS is your resource to analyze fan performance and proffers solution in a minute so that you can get the work done flawlessly at minimum time.
Changing Airflow is a Breeze – See chart in pictures.
Desired air flow= 5000 CFM
Measurement= 4500 CFM
Belt size: B
You want to increase air flow by 500 CFM, 10%
Solution: Using Pulley GPS OP, is #6.
From OP #6 on the chart you move left.
You can increase flow by either 8% or 11%, its your call.
For 8% close the pulley by 3 half turns to OP #3.
For 11% close the pulley by 4 half turns to OP #2
If the pulley is too small or large for desired airflow, the lower chart will guide you to the right size.
• Used at both digital and analog modes
• Used as a micrometer
• Built in belt sizer