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Old 03-14-2011, 08:46 PM #1
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Default Gentec PS-310WB Thermopile

I just purchased this thermopile from ebay:

Gentec Laser Sensor Head Thermopile Model # PS-310WB - eBay (item 330447675278 end time Mar-14-11 12:02:45 PDT)



Does anyone have any experience with this type of unit? I couldn't find any real documentation on it other than product specs. I need to know what the interface signals are, how to calitbrate etc.


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Old 03-14-2011, 09:20 PM #2
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Default Re: Gentech PS-310WB Thermopile

Um. Kind of unrelated, but...

Did the seller give any indication of the condition of the surface of the sensor? It's hidden in all the photos...

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Old 03-14-2011, 10:06 PM #3
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Default Re: Gentech PS-310WB Thermopile

I did not, although the description does state they tested it. Its a shot in the dark anyways. If its no good I plan to use the enclosure to build my own thermopile.
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Old 03-14-2011, 10:29 PM #4
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Default Re: Gentech PS-310WB Thermopile

I would ask Lasersbee. He is probably the thermopile expert around here.
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Old 03-14-2011, 10:31 PM #5
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Default Re: Gentech PS-310WB Thermopile

It looks like a nice sensitive head, If the sensor disk coating is burned you can try to recoat it, that will probably work. I'm testing that now with a few ophir thermopiles I have.
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Old 03-15-2011, 01:30 AM #6
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Default Re: Gentech PS-310WB Thermopile

Quote:
Originally Posted by Bluefan View Post
It looks like a nice sensitive head, If the sensor disk coating is burned you can try to recoat it, that will probably work. I'm testing that now with a few ophir thermopiles I have.
That's good to hear.

I emailed Gentech to see if they have an application manual. i should have an answer within 48hrs.
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Old 03-15-2011, 01:34 AM #7
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Default Re: Gentech PS-310WB Thermopile

Quote:
Originally Posted by Meatball View Post
I would ask Lasersbee. He is probably the thermopile expert around here.
You do realize that laserbees don't use radial thermopiles right?

They use TECs, which are constructed very differently.
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Old 03-15-2011, 03:41 AM #8
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Default Re: Gentech PS-310WB Thermopile

Just because our products use a Wafer Type Thermopile does
not mean we are noobs to Radial Thermopiles...

We have taken a few radial thermopile sensors apart for repair...
If you can gently open your Thermopile head you could trace the
wires going to the Radial Sensor.. There will be 2 wires coming
directly from the sensor and it may go into an ampilifer/calibration
circuit. From there there could be from 3 to 5 wires going to the
Connector. If there is circuit inside then there will be at least....
1-Ground wire
1-Power wire
1-Sensor Signal wire

or at the most

1- Ground wire
1- Power wire
1- Sensor Ground wire
1- Sensor Signal wire
1- Cable sheild Ground Wire

If you can get the drawings from the manufacturer... that
would be the best..

As was stated further above... make sure the Sensor's Active
Area is not badly damaged... Slight damage should still be OK.

Jerry
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Old 03-15-2011, 03:51 AM #9
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Default Re: Gentech PS-310WB Thermopile

He likely says that (and do correct me if I'm wrong) because you often tote your painted TEC sensors as "wafer thermopiles". This implies the illusion that they are similar to radial thermopiles like Coherent and Ophir sensors we're used to seeing even though their construction is radically different.


Hopefully Jerry's information has helped the OP in regards to what he's looking for, all of it is correct from what I see here.
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Old 03-15-2011, 07:16 AM #10
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Default Re: Gentech PS-310WB Thermopile

Thanks for the info Jerry. I really hope Gentech can provide me with some info, It looks like a nice unit and I don't really want to do unnecessary surgery, but I will if I have to.

Edits:

Another one up for sale if anyone is interested:
http://cgi.ebay.com/Gentec-Laser-Sen...item5adf8abe35

Here is the power and meter module for it:
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Old 03-15-2011, 12:43 PM #11
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Default Re: Gentech PS-310WB Thermopile

Quote:
Originally Posted by MarioMaster View Post
He likely says that (and do correct me if I'm wrong) because you often tote your painted TEC sensors as "wafer thermopiles". This implies the illusion that they are similar to radial thermopiles like Coherent and Ophir sensors we're used to seeing even though their construction is radically different.
Actually.... FYI... Scientech uses the same Waffer type "TEC" based Thermopiles.



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Old 03-15-2011, 01:52 PM #12
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Default Re: Gentec PS-310WB Thermopile

The manual:
http://www.google.nl/url?sa=t&source...ZaSABA&cad=rja

A 100uW minimum detectable power is pretty good for a thermal laser power meter. The pinout also reveals the thermopile is directly connected to the output ins, make your own amplifier, calibrate the thing and you're done (if the sensor surface if not damaged).
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Old 03-15-2011, 01:57 PM #13
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Default Re: Gentec PS-310WB Thermopile

From Scientech's website:

Quote:
In a disc calorimeter, heat is typically measured by a thermopile, which is essentially a Peltier cooler used in reverse.
It's "essentially" the same because it's heat flow generating voltage. If Scientech bought run-of-the-mill TEC's to run backwards... the world of professional LPM's would have serious problems.

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Old 03-15-2011, 04:53 PM #14
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Default Re: Gentec PS-310WB Thermopile

Well, they are using more specific TECs, not the "12V 40W ebay model" ones

I mean, their ones are TECs made on custom design, with a lot more junctions and with a reading plate that is a bit more efficent in spreading heat and more light than normal thermopiles, but yes, essentially they are still TECs ..... also, they place on the reading surface a calibrated heater, that you can power with a certain voltage for calibrate the assembly yourself, and you can't find this in commercial TECs.
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Old 03-15-2011, 06:53 PM #15
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Default Re: Gentec PS-310WB Thermopile

@ HIMNL9...

For the LaserBee I and LaserBee II we have the 8mm X 8mm TECs
designed by a company to our specs...
The Scientech Thermopile we took apart about 3 years ago gave us
the idea to use a similar principle (TEC) when we designed the first
LaserBee....

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Old 03-15-2011, 07:03 PM #16
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Default Re: Gentec PS-310WB Thermopile

@lasersbee: Yes, i don't have one of your units, but i can guess it's probably a custom 98-junctions unit .....

Sorry for the confusion, speaking about the heater on the reading surface i was referring to the Scientech units that twithe828 mentioned, not about the Laserbee ones
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