Wireless Sensors for Turbine Blade Tip-to-Casing Cold Clearance Measurements

Gas and steam turbine manufacturers of fossil power plants have long used hand-held feeler gages to measure turbine blade tip clearances and inspect the roundness of the TBC linings at access ports provided for that purpose. With new construction and at overhaul, turbine blade tip-to-casing clearances at room temperature must be properly set.

Philtec has developed the wireless non-contact sensor system CMS3400 to replace manual feeler gage methods. As a technician slowly jogs a rotor thru 360° of rotation, Gap and Angle data pairs are simultaneously recorded from 4 rows of blades and saved to a USB flash drive for offloading and data analysis. CMS3400 is a four channel wireless sensor system that digitally captures the full 360° picture of  blade tip-to-casing roundness and clearance data. This product represents a major advancement in the state-of-the-art.

Sensor ModulesTip Clearance Data

MORE INFO AT  Wireless Sensors for Blade Tip Clearance

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USB Powered Sensors

µDMS-RC22 & USBIntroducing our smallest and most powerful digital sensor series with USB output: the MicroDMS series (µDMS). Powered via any standard USB port, or multiplexed via any standard USB hub, this new sensor series boasts a maximum data sample rate of 16,000 samples per second in a 145 gram enclosure of LWH dimensions 75 x 50 x 23 mm. With Philtec’s fully-featured DMS Control freeware, this sensor is a powerful solution to many measurement problems.

With its miniaturized size and USB power, it is an ideal solution for high density workstations where space is at a premium. Sensors can be stacked together to form the most compact arrangement. For example, 6 sensor modules can be stacked together in a space of 132 mm.

Contact our application engineering staff to explore the possibilities the µDMS series offers for you.

6 sensor boxes

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New Sensor Model for 75 mm Operating Range

Philtec adds the model D240 sensor having an overall operating range of 75 mm.

Sensor with 75 mm Measurement Range

Sensor with 75 mm Measurement Range

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Probes for Internal Thread Inspection

The Problem: Inspection of the integrity of small internal threads such as M10.

The Solution: Very small fiberoptic probes can be made having two diametrically opposed sensors.Thread Inspection Probe

The probe can be used to  scan the length of internally threaded holes as the probe is inserted. The probe is rotated 90° at the bottom of the hole and the thread is scanned once more as the probe is retracted, thereby providing complete thread inspection every 90°. Plus and minus accept/reject tolerances can be set by comparing known good part voltages with known defective part voltages. Missing, shallow and/or damaged threads can be detected as they fall outside the accept/reject tolerance.

Advantages of Fiberoptic Probes

  • Non-Contact
  • High Speed
  • For All Materials Including Non-metals
  • Catches Missing, Shallow, Damaged Threads

Read more…

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Blue Light Sensors


Blue Light Sensors for displacement measurements on extremely hot targets.

Metals emit light energy in the red spectrum when heated above 600°C. Red-glowing parts interfere with displacement measurements of optical sensors that use red lasers or LEDs as the light source.

Tests run by Philtec engineers demonstrate there is no detectable light energy from hot targets in the blue wavelength spectrum.

Sensor probes and tips exposed to temperatures >600°C are constructed with exotic materials that can withstand extreme temperatures such as:
– fused silica (quartz) fibers
– ceramic adhesives
– high temperature alloys

– gas turbines
– glass forming ovens
– glowing metals and ceramics
– hot steel processing

The combination of blue wavelength and exotic material technologies allow displacement measurements to be made in extremely high temperature applications.  Tell us about your application.  Our engineers will help you configure sensor systems meeting your requirements.

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Introducing Wireless Sensing


Philtec has developed an accessory pack BAP 2.0 that enables any Philtec mini-DMS Displacement Measurement System with RS-232 output to be run in wired or wireless modes.
Sensor & Bluetooth Module
BAP2.0 includes:

  • Bluetooth Battery/Radio Module
  • USB Bluetooth Micro Adaptor
  • 15 Ft. Mini to Standard USB Cable
  • 1 Ft. Sensor Data Link Cable
  • Operating Software
    Bluetooth Module

Power Requirements
USB @ 500mA

Time To Charge: 4 Hours
Run Time: 10 Hours w/full charge

Standby Mode: 4 Weeks
Run Time: 3 Hours After 4 weeks Standby
Max. Data Rate = 900 Samples/Second

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Welcome to the Philtec Blog

Happy New Year, and welcome to the Philtec blog. We will be posting information and adding content on a regular basis.

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