Siemens TEC22xx-2 Series LONWORKS Technical Bulletin

Belt Weighing
Speed Sensors
SITRANS WS300
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Overview
SITRANS WS300 is a low- to high-resolution shaft-driven speed
sensor.
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Benefits
• Light and rugged design, IP65 rated
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• Compact and economical
• Easy, low-cost installation
• Accurate belt speed detection
• Optional resolutions for measurement over a range of belt
speeds
• Corrosion resistant
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Application
SITRANS WS300 speed sensor operates in conjunction with a
conveyor belt scale, providing a signal to an integrator which
computes the rate of material being conveyed. At only 1.22 kg
(2.68 lbs), it is one of the lightest and most durable units ever de-
veloped for monitoring conveyor belt speed. With its rugged
cast aluminium housing, it is suitable for outdoor installation, and
its low weight prolongs bearing life.
It is directly coupled to a rotating tail or bend pulley shaft to en-
sure accurate belt-travel readout, eliminating problems caused
by belt slippage or material build-up. The WS300 converts shaft
rotation into a pulse train of 32, 256, 1000, or 2000 pulses per
revolution using a high precision rotary optical encoder. The dig-
ital signal is transmitted as speed input to any Siemens integra-
tor for calculation of belt speed, flow rate and totalized weight.
This low- to high-resolution speed sensor provides a frequency
signal proportional to the shaft speed, enabling a range of
speeds to be read accurately. The quadrature type shaft en-
coder prevents erroneous speed signals due to vibration or shaft
oscillation. The WS300 is easily mounted and is bi-directional for
either clockwise or counter-clockwise belt travel.
The IS version uses an inductive proximity switch detecting ro-
tating targets.
4/40 Siemens WT 10 · 2010
© Siemens AG 2010