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Chapter 2: Functional Description 13 of 60
Chapter 2: Functional Description
2-1 Models Covered in This Manual
This manual provides operation, installation, and maintenance instructions for rate monitors
of various extrusion rates and specifications. See below for a list of available models.
• GH-M Rate Monitor Units
• GH Full Control Units with or without Line Speed Control
• GH-F Gravimetric Feeder Units
Model numbers are listed on the serial tag. Make sure you know the model and serial number
of your equipment before contacting the manufacturer for parts or service.
GH systems are as varied as the applications they service. All gravimetric rate monitors are
sized to meet the specific requirements stated by the Customer at the time of purchase.
2-2 General Description
GH-M Rate Monitor Systems are designed to measure the extrusion rate of plastic pellets and
regrind. This measurement can be read at a local display or monitored through the
communications using the Ethernet module.
GH Full Control Systems are designed to measure the extrusion rate of plastic pellets and
regrind. This system can then control the output of the extruder and hauloff (if using the line
speed option) to a desired target value that is entered by the operator. This system can be
used for monitoring as well as full control. Some of the configurable methods of operator
input are lbs/hr, kgs/hr, feet/min, meters/min, weight/length, and weight/area.
GH-F Gravimetric Feeders are designed to gravimetrically control the feed rate of an additive
feeder using a loss-in-weight hopper that is mounted directly on the feeder. This feeder then
flows into the extruder. The operator enters in a desired percent. The system continuously
measures the speed of the extruder through a proximity switch mounted at the back of the
screw (this can also be wrote through communications) and then calculates the extruders
throughput based on a volumetric approximation. Based on the entered percent and the
current calculated extruder throughput the system then calculates a target lbs/hr or kgs/hr for
the feeder. Then based on the measured rate of the additive the GH-F continuously adjust the
motor speed of the feeder to achieve accurate results.
Standard equipment is not designed to measure powder or any other materials. Optional
equipment may be purchased to measure the extrusion rate of powders.
Accessories
The manufacturer offers a variety of standard options for GH Systems including knife gates,
low-level proximity switches, Ethernet communication modules, and hoppers specifically
designed to measure the extrusion rate of powders. All accessories are designed and
manufactured to ensure proper results for your application.