Reliable Speed Sensor for Conveyor Belt Weighing Applications
The Siemens SITRANS WS300 (7MH7177) is a shaft-mounted speed sensor designed to provide accurate belt speed measurement in continuous material handling systems.
In a conveyor belt weighing system, accurate belt speed information is essential for calculating the actual material throughput. The WS300 directly measures the rotation of the conveyor pulley shaft and sends pulse signals to the connected belt scale integrator, which calculates belt speed, flow rate, and totalized material weight.
Typical applications include:
Mining and mineral processing
Coal handling systems
Cement and aggregate industries
Bulk material transportation
Quarry operations
Industrial conveyor systems
Direct Shaft-Mounted Design for Accurate Speed Feedback
Unlike contact wheel speed sensors that may be affected by belt slip, dust buildup, or changing belt conditions, the SITRANS WS300 is directly coupled to the rotating pulley shaft.
This design provides:
Direct measurement of shaft rotation
Improved belt speed accuracy
Reduced influence from belt surface conditions
Stable performance in continuous operation
The direct mechanical connection makes it especially suitable for applications where accurate belt weighing depends on reliable speed signals.
Flexible Resolution Options for Different Conveyor Speeds
The SITRANS WS300 is available with multiple pulse resolution options to match different conveyor requirements.
Available resolutions include:
32 pulses per revolution
256 pulses per revolution
1,000 pulses per revolution
2,000 pulses per revolution
The selected resolution allows engineers to optimize measurement accuracy according to conveyor speed and weighing system requirements.
Wide Speed Measurement Range
The WS300 supports a wide operating speed range suitable for various industrial conveyor systems.
Key performance features:
Speed range: 0.3 to 2,000 rpm
High-resolution pulse output
Reliable rotation detection
Continuous operation capability
This flexibility allows the same sensor family to be used across different conveyor sizes and material handling conditions.
Compatible with Siemens Belt Scale Systems
The SITRANS WS300 is designed to operate with Siemens weighing systems and belt scale integrators.
Compatible systems include:
Milltronics BW100
Milltronics BW500
SIWAREX FTC
SIWAREX WP241
SIWAREX WT241
It can also be integrated with selected third-party belt scale systems, providing a flexible solution for upgrading or replacing existing speed measurement devices.
Durable Industrial Construction
The WS300 is designed for demanding industrial environments where dust, vibration, and outdoor installation are common.
Construction advantages include:
Rugged industrial housing
NEMA 4X protection
Corrosion-resistant design options
Long bearing life
Suitable for harsh operating conditions
The compact and lightweight design helps reduce mechanical load on the rotating equipment while maintaining reliable speed measurement performance.
Hazardous Area Approvals Available
For applications in potentially explosive environments, SITRANS WS300 can be configured with hazardous area approvals.
Available certifications include options such as:
ATEX
IECEx
CSA/FM
Other international approvals depending on configuration
This allows the sensor to be applied in industries including mining, bulk handling, and processing plants where explosion protection is required.
Low Maintenance and Long Service Life
The SITRANS WS300 uses a proven rotary sensing design with durable mechanical components.
Benefits include:
Minimal maintenance requirements
Reliable long-term operation
Reduced conveyor downtime
Stable pulse signal output
For continuous production environments, dependable speed measurement helps maintain accurate material accounting and process efficiency.
Typical Applications
Mining & Minerals
Used for:
Ore conveyor monitoring
Bulk material transportation
Production flow measurement
Cement & Aggregate
Suitable for:
Limestone conveyors
Crusher feed systems
Material handling lines
Coal & Power Industry
Applied in:
Coal conveyor systems
Fuel handling processes
Bulk material monitoring
Industrial Manufacturing
Used for:
Production conveyors
Material tracking
Automated weighing systems
FAQ
What is Siemens 7MH7177?
Siemens 7MH7177 is the order series for the SITRANS WS300 shaft-mounted speed sensor, used to measure conveyor belt speed in belt weighing and material handling systems.
How does SITRANS WS300 work?
The WS300 measures the rotation of a conveyor pulley shaft and generates pulse signals. The connected belt scale integrator uses these signals to calculate belt speed, material flow rate, and totalized weight.
What is SITRANS WS300 used with?
It is mainly used with Siemens Milltronics belt scale systems and integrators such as BW100, BW500, and SIWAREX weighing controllers.
What is the difference between 32 PPR, 256 PPR, and 2000 PPR versions?
The difference is pulse resolution:
Lower PPR versions are suitable for simpler conveyor speed monitoring.
Higher PPR versions provide finer speed measurement resolution for applications requiring greater accuracy.
The correct selection depends on conveyor speed and weighing accuracy requirements.
Can SITRANS WS300 be installed outdoors?
Yes. The WS300 is designed for industrial environments and offers NEMA 4X protection, making it suitable for many outdoor conveyor installations.
Is SITRANS WS300 a complete belt weighing system?
No. The WS300 is a speed sensor component. It provides speed signals to a belt scale integrator, which combines speed information with load signals from the weighing system to calculate material flow and total weight.
