WS300 Brochure

Accurate and dependable
SITRANS WS300 speed sensor
Accurate belt speed
detection
SITRANS WS300 is a highresolution shaft-driven speed
sensor suitable for low or varying shaft speeds. With hazardous dust approvals it is suitable
for heavy industries such as
mining, cement, or chemical
processing. It can also handle
the harsh environments of the
food processing industry.
Design
Lightweight yet rugged,
SITRANS WS300 is compact
and easy to install. At only
1.22 kg (2.68 lbs), it is one of
the lightest and most durable
units ever developed for monitoring conveyor belt speed.
With its rugged cast aluminum
housing, it is suitable for outdoor installation, and its low
weight prolongs bearing life.
Weighing technology
www.siemens.com/weighing
Answers for industry.
Mode of operation
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. It is directly
coupled to a rotating tail or bend pulley shaft to ensure accurate
belt-travel readout, eliminating problems caused by belt slippage
or material build-up.
SITRANS 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 digital signal is transmitted as
speed input to either a Milltronics BW100, BW500 integrator or
SIWAREX FTC PLC module for calculation of belt speed, flow rate
and totalized weight. Integrators offer programmable analog
output. Milltronics BW500 connects the weighing measurements seamlessly into a control system through communication
protocols such as PROFIBUS DP, Allen-Bradley Remote I/O and
DeviceNet. Modbus is standard with the BW500.
This high resolution speed sensor provides a frequency signal
proportional to the shaft speed, enabling low or varying shaft
speeds to be read accurately. The quadrature type shaft encoder
prevents erroneous speed signals due to vibration or shaft oscillation. SITRANS WS300 is easily mounted and is bidirectional for
either clockwise or counter-clockwise belt travel.
SITRANS WS300
With four different resolutions
offered, SITRANS WW300
can accurately monitor lowto high-speed applications.
SITRANS WS300 is directly coupled to a rotating tail or bend
pulley shaft ensuring accurate
belt travel readout, eliminating
problems caused by belt slippage or material build-up. With
sealed bearings, it offers protection against water and dust
ingress. Whether installed in a
mine monitoring belt speeds of
6 m/s (1181 FPM) or monitoring
food processing conveyor speed
at 0.05 m/s (10 FPM), SITRANS
WS300 offers accurate and reliable measurement.
• Light and rugged design, IP65
rated
• Compact and economical –
installs in hard to reach places,
with little space required
• Can be used with up to 10
different integrators on one
conveyor, lowering cost of
ownership
• Corrosion-resistant
components are durable and
virtually maintenance free
Siemens AG
Industry Sector
Sensors and Communication
76181 KARLSRUHE
GERMANY
www.siemens.com/weighing
SITRANS WS300
Mode of operation
Measuring principle
Pulse from shaft rotation using high precision rotary optical encoder
Typical applications
When a high resolution speed sensor is required
Input
Shaft rotation 0.5 to 2000 rpm, bidirectional
Output
• Unidirectional open collector sinking output
• 10 to 30 V DC, 25 mA max.
• 32, 256, 1000, or 2000 pulses per revolution
• 2 to 2000 Hz
Rated operating conditions
Ambient temperature
-40 to 55 °C (-40 to 131 °F)
Degree of protection
NEMA 4X, Type 4x, IP65
Design
Enclosure
• Rated NEMA 4X, Type 4X, IP65
• Painted aluminum
• Stainless steel, optional
Power supply
10 to 30 V DC, 60 mA max.
Cable
Recommended
Standard: Three-wire shielded, 0.75 mm2 (18 AWG)
Intrinsically Safe (IS): 2 wire shielded, 0.324 mm2 (22 AWG)
Max. run 305 m (1000 ft) both versions
Approvals
• CSA/FM Class II, Div. 1, Groups E, F, G, and Class III
• ATEX II 2D Ex tD A21 IP65 T70 °C , IECEx Ex tD A21IP65 T70 °C
• CE, C-TICK
• IS option
Subject to change without prior notice
Available as pdf only
Order No. 7ML1996-5LG03
© Siemens AG 2010
The information provided contains merely general descriptions or characteristics of performance which in case of
actual use do not always apply as described or which may
change as a result of further development of the products.
An obligation to provide the respective characteristics shall
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names of Siemens AG or supplier companies whose use by
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