Robotics
A pneumatic robot does exactly what the pressure tells it to do. The sensor determines whether that is right or wrong.
Pneumatic systems control the movement, force, and gripping action of robots across manufacturing, logistics, and assembly applications. Pressure accuracy translates directly into positional accuracy and force control. A sensor that is affected by noise, responds slowly, or drifts introduces those same errors into every motion the robot makes.
Pneumatic actuation drives a significant share of the industrial robot population. Robotic arms use compressed air to extend and retract cylinders, control joint movement, and operate end-of-arm tooling, including vacuum grippers, suction cups, and pneumatic clamps. In each case, the pressure in the pneumatic circuit determines the robot’s force, speed, and position. An assembly robot placing a component onto a circuit board applies force via air pressure, and the accuracy of that force determines whether the component is placed correctly or damaged. A logistics robot that picks up packages using vacuum suction relies on pressure monitoring to confirm the part is held before the move begins. Pressure errors in robotic systems do not remain confined to the pneumatic circuit. They propagate into motion and force errors, and, in collaborative robot applications where robots work alongside humans, into safety errors.
The challenge in robotic pressure sensing is that robots create the very conditions that degrade sensor performance. Servo motors, actuators, and rapid mechanical cycling produce vibration and electrical noise that manifest as signal noise in pressure readings. The same environment that makes sensing difficult is the one in which the sensor must operate continuously. Robotic systems also operate across a range of pneumatic subsystems simultaneously. End-of-arm tooling, primary actuators, and pneumatic supply lines all run at different pressures within the same robot or cell. Because pneumatic robots cycle at high speed, the pressure sensor must respond fast enough to keep pace with the control loop. A sensor that lags behind the system cannot support accurate position or force control at operating speeds.
Superior Sensor’s ND Series sensors deliver the speed, noise rejection, and multi-range capability that pneumatic robotics requires. The fast update rate enables control loops to run at speeds robotic systems demand. The integrated pressure switch provides immediate output when pressure drops below the threshold, signaling a pneumatic fault and enabling a rapid automated response before pressure loss causes a motion error or safety event. The extended operating temperature range accommodates the thermal environment of industrial robot cells, where motors and drives generate significant heat during continuous operation.
Why Choose Superior Sensor for Robotics
Pneumatic robots require sensors that respond at control-loop speeds, reject the vibration and electrical noise the robot itself generates, and provide direct fault response when pressure deviates. Superior Sensor’s NimbleSense architecture meets each of these requirements in a platform designed for the demanding environment inside and around industrial robotic systems.
Multi-Range™ technology
A robotic system includes multiple pneumatic subsystems operating at different pressures. End-of-arm vacuum tooling operates at sub-atmospheric pressures, primary actuator circuits at moderate positive pressures, and pneumatic supply lines at higher supply pressures. Managing each subsystem with a separate sensor configuration increases design complexity and the spare parts inventory. Multi-Range™ enables a single ND Series sensor to cover multiple pressure ranges within a single unit, simplifying robot design and reducing the number of sensor part numbers required across a production facility.
Advanced digital filtering
Robotic systems generate mechanical vibration from servo motors, actuators, and rapid mechanical cycling, which appears as noise in pressure readings. In a control loop where the pressure signal directly drives position and force decisions, noise in the pressure signal becomes noise in the robot’s motion. Superior Sensor’s multi-order digital filter removes this vibration noise at the front end, before it reaches the control loop, giving the pneumatic control system a clean signal that reflects actual circuit pressure rather than mechanical noise from the robot’s own operation.
Integrated closed loop control
Pneumatic robots operate at speeds where control loop latency directly limits performance. The delay between a pressure change and the corrective response determines how precisely the robot can control force and position. Integrated closed-loop control eliminates external control circuitry and reduces loop delays by up to 100x, enabling the pneumatic control system to respond to pressure variations at a speed consistent with the robot’s mechanical cycle rate. Faster response yields tighter pressure control, which translates directly into more accurate and consistent robot motion.
Integrated pressure switch
When pneumatic pressure in a robotic system drops due to a supply fault, a fitting failure, or a leak, the robot must stop before it moves uncontrollably. In a system operating at robotic speeds, the time between fault detection and motion stoppage determines whether a safety event occurs. The integrated pressure switch produces a direct output the moment pressure crosses a defined threshold, without waiting for the signal to traverse the control loop. This provides the fastest possible response to a pneumatic fault, enabling the robot to halt before an uncontrolled movement puts parts, tooling, or personnel at risk.
Integrated 50/60 Hz notch filter
Industrial robot cells contain high-power servo drives, variable frequency drives, and motor controllers that generate substantial power-line interference. This interference appears as noise in pressure readings and, in fast robotic control loops, can produce spurious pressure signals that translate into motion disturbances. The integrated notch filter eliminates this power-line interference at the sensor, ensuring that the pressure signal fed to the robot’s control system reflects actual pneumatic conditions rather than electrical noise from the surrounding drive environment.
Recommended Sensors
Common Device Features: 3.3V supply
Long-Term Stability is measured after first 12 months
Short-Term Error Band (STEB) is measured over 24 hours, after auto-zero
Common Specifications
- Ultra low noise, 17-bit effective resolution
- Exceptional zero stability
- Integrated 50/60 Hz notch filter
- Optional advanced digital filtering
- Optional closed loop control
- Optional 3-mode pressure switch
- Temperature-compensated from -20°C to +85°C
- Supply voltage compensation
- Fully integrated compensation math
- Standard I2C and SPI interfaces
Robotics FAQ
How do pressure sensors control pneumatic robotic systems?
Pressure sensors in pneumatic robotic systems provide the real-time feedback the control loop uses to regulate actuator force, speed, and position. In a pneumatic cylinder driving a robot joint or linear actuator, cylinder pressure determines the applied force and, through the mechanical system, the actuator’s position. The control loop reads the sensor, compares the reading to the target pressure, and adjusts the valve position to bring them into agreement. In end-of-arm tooling, pressure sensors confirm that vacuum suction has engaged a part before the robot begins its transfer move and monitor grip pressure in pneumatic clamps to ensure the part is held securely throughout the motion. The pressure sensor is not a peripheral component in a pneumatic robot. It is the primary feedback element of the control system.
What pressure ranges are typical in pneumatic robotics?
Pneumatic pressure requirements in robotics vary by subsystem. Industrial compressed air supply systems typically operate at 500-1000 kPa. Primary pneumatic actuators for robot joints and linear motion typically operate at 100 to 700 kPa, depending on the application’s force requirements. End-of-arm vacuum suction systems operate below atmospheric pressure, in the range of -10 to -90 kPa relative to ambient, while pneumatic clamps and grippers operate at positive pressures of 100 to 600 kPa. Force-controlled applications using soft robotics or compliant grippers may require pressures in the range of a few kilopascals for fine force control. The ND Series Low and Mid Pressure variants cover the positive-pressure range required by pneumatic actuators and support supply monitoring.
How does sensor response time affect robotic performance?
In a pneumatic control loop, sensor response time determines how quickly the system detects a pressure deviation and begins correcting it. Even a few milliseconds of lag introduces a phase delay into the control loop, limiting the maximum correction rate. At robotic operating speeds, where actuators cycle hundreds of times per minute, a slow sensor forces the control loop to operate at a lower bandwidth, reducing positioning accuracy and force control precision. Superior Sensor’s ND Series integrated closed-loop control reduces loop delays by up to 100x compared to external control architectures, enabling the pneumatic control loop to operate at bandwidths consistent with modern robotic cycle rates.
How does a pressure switch protect a pneumatic robot from faults?
A pressure switch provides a direct hardware output when pressure crosses a defined threshold, without requiring the controller to process the signal. In a pneumatic robot, this matters when pressure drops due to a supply failure, a loose hose fitting, or a seal failure. The robot is moving at its programmed speed when the fault occurs, and the time from fault onset to the robot’s stop determines whether it reaches a safe state or makes an uncontrolled movement. An output triggered at sensor speed, before the control loop completes its cycle, provides the earliest possible fault detection.
What causes pressure measurement noise in robotic environments, and how is it eliminated?
Robotic environments have several noise sources that affect pressure measurement. Mechanical vibration from servo motors, actuators, and rapid position changes generates noise that propagates through the robot structure. High-power servo drives and variable-frequency motor controllers generate power-line harmonic interference that couples into sensor electronics. Rapid valve switching in pneumatic circuits creates pressure transients that can resemble process signals but are artifacts of the switching event. Superior Sensor’s ND Series addresses these sources with two independent noise-rejection mechanisms: the multi-order digital filter removes mechanical vibration and pressure transients before they reach the output, and the integrated 50/60 Hz notch filter eliminates power-line harmonic interference from the electrical environment. The result is a clean pressure signal that reflects actual circuit pressure rather than the electromagnetic and mechanical conditions of the robot cell.
Resources
Low Pressure
Product Brief
Mid Pressure
Product Brief
Technology Brochure
Catalog
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