Service
Meanwhile, we invite you to visit our ZOOM community website where you can find technical information and videos on VibroSystM solutions.
Mateo Perez
Field Technician – SERVICE
Hello VibroSystm,
Would someone in VibroSystm provide more details on the operating principle behind the ThermaWatch rotor waveguide/infrared sensor? Is there a document or website that describe with more detail than the datasheet (found on https://www.vibrosystm.com/en/product/twr)?
This website provide some background on infrared sensors: 0317-Omega.pdf (thermalprocessing.com) Does it match the technology used? The waveguide is certainly to ensure the infrared signal reach the target at the back of the core. What happen when contamination fill up the waveguide? I assume the sensor reading is affected. Cleaning is with a vacuum cleaner?
Was the ThermaWatch rotor used above a rotor in one of your reference? Can it be used to see and discriminate the temperature of each pole-to-pole connection? We see more powerplant owners having issues with their pole-to-pole connections (old machines are cycling more than before).
Suggestion for a future model: design with a smaller waveguide height which can fit within 5 mm. Some of our vents in Hydro are only 5 mm high (not as frequent as 6 or above).
Best Regards,
Carl Messier, ing., Eng.
Principal Engineer; Generator and Auxiliaries
Hydro Power
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ZOOM Forum
Hello Mr. Messier
Please find below some answers to your questions. Don't hesitate if you need more information.
Operating principle
The measuring principle of the ThermaWatch Rotor (TWR-100) sensor is the same as all the infrared thermometers on the market. It measures the infrared energy emitted by the poles passing in front of the probe and converts it into a signal compatible with the ZOOM system.
Waveguide
The waveguide is effectively used to channel the IR wavelengths to the IR sensor at the back of the core.
But, it is also used to discriminate and isolate those wavelengths coming from the poles, from the IR wavelengths produced by the stator surrounding the waveguide.
Contamination
Yes the measurements can be affected by dust accumulation inside the waveguide. This is why periodic maintenance is required. Waveguide assembly is designed to be easily removed and reinstalled, in order to be cleaned.
A maintenance kit, including various size brushes and polishing cloths, is available. Clean pressurized air can also be used to remove dust inside the waveguide, on the IR sensor surface, as well as inside the stator ventilation hole.(See procedure attached)
Pole-to-pole connections
Monitoring of pole-to-pole connections can be possible if there is a possibility to install the TWR sensor adequately facing the connections.
VibroSystM does not have actual experience but is open to special requests and participation to any research with a customer.
Smaller diameter waveguide
A new version of ThermaWatch Rotor, the TWR-200, is now available.
It has a maximum diameter of 5.2 mm in order to accommodate smaller ventilation holes.
As you can see in the datasheet attached, in this new version, the IR sensor is positioned inside the ventilation hole close to the poles. The TWR-200 is installed on the stator the same way the TWR-100 was.
Although simplified, a periodic maintenance is still required for the TWR-200 to clean the IR sensor's surface.
Best Regards,
Messier, Carl (GE Vernova)
Good afternoon,
Thank you for the detailed response and new information (TWR-200)!
Best Regards,
Carl Messier, ing., Eng.
Principal Engineer; Generator and Auxiliaries
Hydro Power
From: ZOOM Forum <zoom...@vibrosystm.com>
Sent: November 24, 2023 3:27 PM
To: Service <ser...@vibrosystm.com>
Cc: Messier, Carl (GE Vernova) <carl.m...@ge.com>
Subject: EXT: Re: [ZOOMforum] Re: ThermaWatch rotor waveguide/infrared sensor
|
WARNING: This email originated from outside of GE. Please validate the sender's email address before clicking on links or attachments as they may not be safe. |
Hello Mr. Messier
Please find below some answers to your questions. Don't hesitate if you need more information.
Operating principle
The measuring principle of the ThermaWatch Rotor (TWR-100) sensor is the same as all the infrared thermometers on the market. It measures the infrared energy emitted by the poles passing in front of the probe and converts it into a signal compatible with the ZOOM system.
Waveguide
The waveguide is effectively used to channel the IR wavelengths to the IR sensor at the back of the core.
But, it is also used to discriminate and isolate those wavelengths coming from the poles, from the IR wavelengths produced by the stator surrounding the waveguide.
Contamination
Yes the measurements can be affected by dust accumulation inside the waveguide. This is why periodic maintenance is required. Waveguide assembly is designed to be easily removed and reinstalled, in order to be cleaned.
A maintenance kit, including various size brushes and polishing cloths, is available. Clean pressurized air can also be used to remove dust inside the waveguide, on the IR sensor surface, as well as inside the stator ventilation hole.(See procedure attached)
Pole-to-pole connections
Monitoring of pole-to-pole connections can be possible if there is a possibility to install the TWR sensor adequately facing the connections.
VibroSystM does not have actual experience but is open to special requests and participation to any research with a customer.
Smaller diameter waveguide
A new version of ThermaWatch Rotor, the TWR-200, is now available.
It has a maximum diameter of 5.2 mm in order to accommodate smaller ventilation holes.
As you can see in the datasheet attached, in this new version, the IR sensor is positioned inside the ventilation hole close to the poles. The TWR-200 is installed on the stator the same way the TWR-100 was.
Although simplified, a periodic maintenance is still required for the TWR-200 to clean the IR sensor's surface.
Best Regards,
Le ven. 24 nov. 2023, à 15 h 10, Service <ser...@vibrosystm.com> a écrit :
Hi, we have posted your question on our Technical forum, one of our specialists will answer you shortly.
Meanwhile, we invite you to visit our ZOOM community website where you can find technical information and videos on VibroSystM solutions.
Mateo Perez
Field Technician – SERVICE
On Mon, Nov 20, 2023 at 5:26 PM Messier, Carl (GE Vernova) <carl.m...@ge.com> wrote:
Hello VibroSystm,
Would someone in VibroSystm provide more details on the operating principle behind the ThermaWatch rotor waveguide/infrared sensor? Is there a document or website that describe with more detail than the datasheet (found on https://www.vibrosystm.com/en/product/twr)?
This website provide some background on infrared sensors: 0317-Omega.pdf (thermalprocessing.com) Does it match the technology used? The waveguide is certainly to ensure the infrared signal reach the target at the back of the core. What happen when contamination fill up the waveguide? I assume the sensor reading is affected. Cleaning is with a vacuum cleaner?
Was the ThermaWatch rotor used above a rotor in one of your reference? Can it be used to see and discriminate the temperature of each pole-to-pole connection? We see more powerplant owners having issues with their pole-to-pole connections (old machines are cycling more than before).
Suggestion for a future model: design with a smaller waveguide height which can fit within 5 mm. Some of our vents in Hydro are only 5 mm high (not as frequent as 6 or above).
Best Regards,
Carl Messier, ing., Eng.
Principal Engineer; Generator and Auxiliaries
Hydro Power
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