Products › Torque Sensors › Rotary Torque Sensors › Pulley Torque Sensor (WTQ2071)
Pulley Torque Sensor (WTQ2071)
A micro torque sensor measures very small rotational torque, from 0.1 N·m up to about 10 N·m, on a turning shaft. A strain-gauge bridge on a stainless-steel shaft section reads the twist, and the signal is taken off through brushes. It suits micro-motors, viscometers and small gear or actuator tests where a full-size rotary sensor is too coarse.
- Model: WTQ2071
- Range: 50 and 100 N·m
- Speed: up to 12,000 rpm
- Type: belt-driven pulley, non-contact
- Accuracy: ±0.1 to ±0.2% FS
- Outputs: kHz, 4-20 mA, voltage, RS485 / RS232 / CAN
Overview
The WTQ2071 is a non-contact dynamic torque sensor with an integrated pulley. A drive belt turns the pulley, and the sensor reads the torque passing through it from 0 to 50 or 0 to 100 N·m, at speeds up to 12,000 rpm.
It suits belt-driven test rigs and drives where the shaft is turned by a belt rather than coupled directly, such as motor, fan and blower setups. Outputs cover frequency, 4-20 mA, voltage and serial buses, so it connects to most controllers and data loggers.
Features
What sets this micro torque sensor apart:
Integrated pulley
A built-in sheave takes the drive belt, so torque is read right where the belt turns the shaft.
Non-contact
The signal crosses the rotor-to-stator gap with no slip rings, so nothing wears at speed.
50 and 100 N·m
Two rated capacities for small belt-driven drives.
Up to 12,000 rpm
Fast enough for motor, fan and blower belt drives, with an optional speed pickup.
Many outputs
Frequency, 4-20 mA, ±5 or ±10 VDC, RS485, RS232 and CAN.
Rugged shaft
A 17-4PH stainless-steel shaft in an aluminum housing, with 200% overload protection.
Working principle
A drive belt turns the integrated pulley, which applies torque to the shaft. A metal-foil bridge on the shaft strains under that torque, and its output crosses the rotor-to-stator gap without contact, so there are no slip rings. An optional pickup counts shaft rotation at 60 or 30 pulses per revolution for speed, and torque multiplied by speed gives power.
Technical specifications
| Parameter | Specification |
|---|---|
| Measuring principle | Non-contact strain-gauge shaft with a belt-driven pulley |
| Measuring range | 50 and 100 N·m (0-50 / 0-100 N·m) |
| Accuracy | ±0.1 / ±0.2% FS |
| Zero temperature effect | ±0.02% FS |
| Span temperature effect | ±0.02% FS |
| Compensated temperature | -10 to 60 °C |
| Operating temperature | -20 to 75 °C |
| Maximum speed | Up to 12,000 rpm |
| Speed option | 60 / 30 pulses per revolution |
| Torque output | 10 ±5 kHz, 4-20 mA, ±5 VDC, ±10 VDC, RS485, RS232, CAN |
| Supply | 12-24 VDC, under 100 mA |
| Cable entry | PG7 gland |
| Overload protection | 200% FS |
| Material | Shaft 17-4PH stainless steel; housing aluminum |
Models and ranges
Standard rated torques, non-contact with an integrated pulley:
| Rated torque | Maximum speed |
|---|---|
| 50 N·m | 12,000 rpm |
| 100 N·m | 12,000 rpm |
Pulley or shaft mount
Pick by how the drive reaches the sensor:
| Type | Drive | Choose when |
|---|---|---|
| WTQ2071 pulley | Belt onto an integrated pulley | The shaft is turned by a belt or pulley |
| Shaft sensor | Shaft-to-shaft coupling | The sensor sits directly in the shaft line |
For a direct shaft-to-shaft unit, see the rotary torque sensor.
Applications
- Belt-driven motor and fan test rigs
- Blower and pump drives taken off a belt
- Conveyor and winch drive torque
- Setups where the shaft is driven by a belt, not coupled directly
- Torque, speed and power on a belt-driven shaft
Challenge: A test lab needed torque on a belt-driven test setup, with the readings logged to a PC.
Solution: A pulley torque sensor that takes the drive belt directly, with a digital display and a data recorder over a PC interface.
Result: Torque was read off the belt-driven pulley and logged through the PC interface, so the rig captured runs without breaking into the shaft line.
Related products
FAQ
What is a pulley torque sensor?
It is a rotary torque sensor with a built-in pulley. A drive belt turns the pulley, and the sensor reads the torque the belt passes through it.
What torque range does the WTQ2071 cover?
Two rated capacities, 50 N·m and 100 N·m, at speeds up to 12,000 rpm.
How does it measure torque from a belt?
The belt turns the integrated pulley, which strains a metal-foil bridge on the shaft. The bridge output is read without contact, so there are no slip rings.
Is the WTQ2071 contact or non-contact?
Non-contact. The torque signal crosses the rotor-to-stator gap without slip rings, so nothing rubs when the shaft spins.
What is the maximum speed?
Up to 12,000 rpm, with an optional pickup giving 60 or 30 pulses per revolution for speed and power.
Request a quote
Tell us the torque range and shaft speed, and we configure one micro torque sensor for your drive, not a shelf part. Send the details and our engineers reply with a specification and quote.