Explosion-Proof Motor (XP) Option
The Explosion-Proof Motor (XP) option to the Whisper® Loaders is required when hazardous conditions are present thus
reducing the chance of accidental flash fires related to volatile materials or environment. The Loader is available with
other options including NEMA 7/9 Control Solenoids.
Whisper® Loaders equipped with Explosion-Proof (XP) Motors are designed for operation in hazardous environments;
therefore it is imperative that all electrical connections are made utilizing suitably rated components for such. Proper
grounding reduces/eliminates ignition sources caused by build up of static electricity that could discharge possibly ignit-
ing explosive or flammable vapors or volatile materials. Loader function & operation is the same as with Standard Motor-
powered Whisper® Loaders.
Brushless Motor (BL2) Option
The Brushless (BL2) is our 2nd Generation Motor with integral 2-Stage Fan system controlled by Switched-reluctance
technology. The BL2 model option has no SERVICE warning requirement. The major advantage of the BL2 is there are
NO brushes on the commutator to wear out, eliminating the need to maintain motor brushes, resulting in fewer mainte-
nance checks. Typical motor life is approximately 4000 hr minimum. As an option the motor can be configured with
Variable-Speed (VS) Control circuitry to accommodate conveying delicate materials at slower speeds or dense, robust
materials at the normal higher speed. The BL2 is designed for use on Loaders having inlets Ø1-½” or greater.
Note: Because the BL2 motor design requires a unique Loader-Cover with mounting tabs a direct retro-fit cannot be
incorporated onto an existing Brush-type Motor Cover Assembly.
PROXIMITY SWITCH
The frequency of material brought into the Whisper® Loader is primarily controlled by the material level in the receiving
hopper; when the vacuum is off the Dump Valve Flap is allowed to open. The Proximity Switch senses the Flapper’s
Pivot arm unless the Flap is held open by material in the receiving receiver. The convey cycle is on hold until the material
level in the receiving receiver drops down low enough to permit the Dump Valve Flap to close restarting the cycle.
FILTRATION
Proper filtration is crucial to the performance of your Whisper® Loader and provides protection to the Motor/Turbine
assembly. Filters are installed between the Whisper® Loader’s removable Lid Assembly and the Body’s upper flange.
Whisper® Loaders will have either of the following filter types installed: DI-AC (Diaphragm-Action), Poly-felt or Cartridge
Filter (12” tall is standard, other cartridge lengths & filter media optional depending upon application). For most Pellet
Loader applications the DI-AC filter is used. DI-AC Filters (Nylon media) are used for various applications (Standard
models) and Polyester/Felt (PLVP & VP models) for dusty-material applications; while Cartridge-type Filters are used for
powder-based materials.
Polyester/Felt Flat-Filter
The Poly-Felt Filters are 16 oz Woven Light-Grey Polyester-Felt blend media Calendered (Heat-set) one side with partic-
ulate filtration of up to 0.05 micron. The Poly-Felt Filter is engineered for use in dusty applications where the conveyed
material is dusty or expels a dust like bi-product. Maximum operating temperature 375° F. Note: Although the Poly-Felt
filter captures much smaller particulate matter it does exhibit airflow characteristics slightly lower than a DI-AC filter.
© Copyright 2007 IMS Company. All rights reserved. An ISO 9001:2000 Registered Quality Company
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