Before measuring the current, first determine whether it is DC current or AC current, turn the transfer switch to DC current or AC current; select the appropriate range; connect the multimeter to the circuit; the measured current is:
I = Range / Full Scale × Pointer Index When measuring current, pay attention to: If the DC current is measured, the positive and negative poles of the meter bar cannot be reversed; the meter must be connected in series to the circuit.
Closed impellers have a back and front wall around the vanes, to increase strength. Closed impellers are used primarily in larger pumps and can be used in applications that handle suspended-solid service.
These types of impellers are commonly found in clear liquid applications. They don't do well with solids and are difficult to clean if they become clogged.
Still not sure which impeller will be best for your next pumping application? Be sure to check wtih an application engineer who is well versed in pumps and selection best practices.
Closed Impeller,Closed Impeller Design,Closed Impeller Pump,Semi Closed Impeller
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