TrueSpeed Sensor
MEASURE WHAT MATTERS: SURFACE SPEED
The TrueSpeed Sensor is the fastest way to check the actual surface speed of your rolls and machine clothing – helping you easily identify speed differences caused by input errors and slipping drive rolls.
Every piece of Paper Machine Clothing must run at precisely controlled speeds. But controlling those individual speeds comes from the drive control system making a calculated guess: multiplying the roll diameter and the thickness of the felt or fabric with π and the revs of the drive: v(fabric) = π * 2 * R(2) * N
Manually inputting data puts you at risk of all sorts of errors, from typos and incorrect data to forgetting to update the data after changing the fabric. Combine this with the fact slipping drive rolls often go undetected—while the drive control system shows all section speeds are correct—and you’re left facing numerous breaks, unusual draws, sheet surface defects, or worn-out machine clothing.
The TrueSpeed Sensor is the fastest way to check the actual surface speed of your rolls and machine clothing—helping you easily identify speed differences caused by input errors and slipping drive rolls.
The sensor is ready for use in just a few seconds, and the measurement itself will take about the same.
The TrueSpeed can be used on almost any position, whether wet or dry, hot or cold, stable or vibrating.
Tachometers are standard equipment, but none are as suitable for use on a running paper machine as the Feltest TrueSpeed Sensor. It is a robust construction and all parts are secured. The big diameter measuring wheels can handle speeds up to 3000 m/min and the pivoting handgrip assures auto-aligned of the device in the machine running direction.
Tip! Also read this interesting whitepaper:
| Correct felt permeability: how open do press felts need to be? |
“Identify unwanted speed differences due to input errors and slipping drive rolls”
| Specifications | TrueSpeed Sensor |
|---|---|
| Required control unit | Feltest SpeedController |
| Measuring principle | Count the pulses from magnets in the wheel |
| Range | 10 -3000 m/min | 30 - 9800 fpm |
| To be used on | Machine clothing, rolls, dryer cylinders |
| Accuracy | ± 0.05% of full scale |
| Read-out units | m/s, m/min, km/h, fps, fpm, fph |
| Max. length including handgrip | 300 mm | 6.5 ft |
| Length of the cable | Approx. 2 m | 6.5 ft |
| Protection control unit | !P68 (when connected to the SpeedController) |
| Total weight | 1,2 kg | 2.6 lbs. |
CONTROLS BOTH AIRSPEED AND TRUESPEED SENSOR
The SpeedController reads and stores the measurement data of both the AirSpeed and TrueSpeed Sensor, a two-in-one control unit for both sensors!
MEASURE PRESS FELT PERMEABILITY ON THE FLY
Permeability is key to understanding your felt’s condition. The Feltest AirSpeed Sensor helps you better plan your machine downtime, use the right amount of felt cleaning agents, and troubleshoot any performance problems.
ESTIMATES REMAINING LIFE OF FORMING FABRICS
The Feltest Caliper Profiler measures the caliper, or thickness of forming fabrics and press felts on the fly.
Caliper values help to estimate the remaining life of forming fabrics. For poorly dewatering press felts, the caliper helps to differentiate compaction, contamination and wear.
