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Hi Marilyn,

Isolink only has one electronic board. We replaced the board, and the
problem was solved. Thanks

Wei

On Mon, Jul 30, 2018 at 8:15 PM, Marilyn Fogel <[log in to unmask]>
wrote:

> Motherboard where? Marilyn
>
> From: Stable Isotope Geochemistry <[log in to unmask]> on behalf of
> Wei Huang <[log in to unmask]>
> Reply-To: Stable Isotope Geochemistry <[log in to unmask]>
> Date: Monday, July 30, 2018 at 10:01 AM
> To: <[log in to unmask]>
> Subject: Re: [ISOGEOCHEM] Isolink HTC oven couldn't reach the desired
> temperature
>
> Hi all,
>
> The problem was solved by replacing the motherboard. Thank you for all the
> suggestions and information!
>
> Wei
>
> On Tue, Jul 17, 2018 at 8:43 AM, Stefan Merseburger <
> [log in to unmask]> wrote:
>
>> Hello Wei,
>>
>> it's probably a confusion. The transformer in the HTC does not increase
>> the voltage but the internal amperage. Usually if ~225V or 230V doesn't
>> matter. We have the predecessor of the IsoLink HTC (Flash 2000 HTC Plus, or
>> so) and after a few month, it was necessary to increase the current
>> intensity (following the described procedure in the manual: unscrew
>> backside and set the cable of the associated transformer one number
>> higher). Nevertheless, with this problem, we could reach easily above
>> 1400°C and then the temperature was slowly fluctuating below 1450°C. Your
>> description sounds different to me.
>>
>> In addition, you could have another software related problem (we also
>> suffered): The ThermoFisher Software IsoDat had a wrong max. Temperature
>> set somewhere deeply hidden in its settings for the HTC side. To solve that
>> we had to install the old "Eager Experience" software (for operating the
>> HTC/EA without mass spectrometer), that overrides the faulty setting with
>> the correct one. Our max. point was 1100°C, maybe yours is now 1200°C? Then
>> our "Pyrolysis Mode" got it's right maximum temperature back.
>> I hope it helps.
>>
>> Good luck,
>> Stefan
>>
>>
>>
>> Am 16.07.2018 um 22:32 schrieb Wei Huang:
>>
>>> Thank you for all online/offline helps!
>>>
>>> The new ovens came with new thermocouples (built in). So, it shouldn't
>>> be thermocouple issue. This Isolink HTC oven doesn't have the transformer
>>> to increase voltage as TCEA oven does. Our current inlet voltage is ~225V
>>> rather than 230V. I am thinking if it is possible to add a transformer to
>>> this HTC oven. I have scheduled an electrician and will see what is his
>>> suggestion. I will keep updating here.
>>>
>>> Wei
>>>
>>> On Mon, Jul 16, 2018 at 4:35 AM, Kolar, Allison (IMK) <
>>> [log in to unmask] <mailto:[log in to unmask]>> wrote:
>>>
>>>     It would be a good idea to check the thermocouple as well. I agree.
>>>     I had the same issue years ago with our Flash EA 1112 and it was a
>>>     faulty thermocouple. (The furnace was changed some time afterward –
>>>     but this was due to other circumstances – the temperature showed the
>>>     correct reading, but samples were not combusting and after removing
>>>     the front of the instrument, it was apparent the furnace was not
>>>     heating up sufficiently.)____
>>>
>>>     __ __
>>>
>>>     Good luck____
>>>
>>>     __ __
>>>
>>>     *From:*Stable Isotope Geochemistry <[log in to unmask]
>>>     <mailto:[log in to unmask]>> *On Behalf Of *mwolhowe
>>>     *Sent:* Friday, July 13, 2018 8:13 PM
>>>     *To:* [log in to unmask] <mailto:[log in to unmask]>
>>>     *Subject:* Re: [ISOGEOCHEM] Isolink HTC oven couldn't reach the
>>>     desired temperature____
>>>
>>>     __ __
>>>
>>>     It sounds like a problem with the power supply to the furnace itself
>>>     to me. I don't know about HTC on the newer isolink, but the the
>>>     older GC-TC interface had a big external power supply that was
>>>     necessary to get the TC furnace up that high - I forget the exact
>>>     details of this because I last did it so long ago, they occasionally
>>>     need to be opened up and have a wire 'tapped into' a different
>>>     position on a... transformer I believe it was? I had THOUGHT that
>>>     was due to changing resistance in the furnace over time, but perhaps
>>>     I was misinformed? The one time I did this, it was because of the
>>>     same symptoms you describe (thought we didn't have multiple furnaces
>>>     to test on). Does anyone else have more recent experience having to
>>>     do this?____
>>>
>>>     In any event, I'd take a look into the health of the power supply.
>>>     There should be some sort of solid state relay that switches current
>>>     to the heater on and off at the command of the temp controller, I
>>>     know those things can wear over time and have problems switching on
>>>     and off at the desired frequency (we just had one in a muffle
>>>     furnace die and melt a bunch of glassware).____
>>>
>>>     Alternately, have you tried swapping the thermocouple or checking
>>>     with an external one?____
>>>
>>>     __ __
>>>
>>>     On Fri, Jul 13, 2018 at 7:25 AM, Wei Huang <[log in to unmask]
>>>     <mailto:[log in to unmask]>> wrote:____
>>>
>>>         Dear all,____
>>>
>>>         __ __
>>>
>>>         Our HTC oven on Thermo Isolink couldn't reach the desired
>>>         temperature - 1400 degree C. It could be heated up to ~ 1200
>>>         degree and stayed at 1200 with setting 1400 degree. Everything
>>>         looked normal. There was not any error message. The first
>>>         thought was the oven failed. So, we tested another two new HTC
>>>         ovens. The first one stayed at ~1200 degree with setting at
>>>         1400, and the second stayed at ~1000 degree. It is less possible
>>>         all three ovens are bad. Anybody has idea about it? Thank you
>>>         very much in advance!____
>>>
>>>         __ __
>>>
>>>         ____
>>>
>>>         Wei Huang, Ph.D.____
>>>
>>>         ____
>>>
>>>         Stable Isotope Lab Manager____
>>>
>>>         Lamont-Doherty Earth Observatory of Columbia University____
>>>
>>>         61 Route 9W
>>> <https://maps.google.com/?q=61+Route+9W&entry=gmail&source=g>
>>>         <https://maps.google.com/?q=61+Route+9W+%0D%0APalisades,+NY+
>>> 10964&entry=gmail&source=g>
>>>         Palisades, NY 10964
>>>         Lab: 845-365-8143 <tel:845-365-8306>
>>>         [log in to unmask] <mailto:[log in to unmask]>____
>>>
>>>         __ __
>>>
>>>         __ __
>>>
>>>     __ __
>>>
>>>
>>>
>> --
>>
>> Stefan Merseburger
>> Tel.: +49 721 608-41678
>> Karlsruher Institut für Technologie
>> Institut für Geographie und Geoökologie
>> Reinhard-Baumeister-Platz 1
>> <https://maps.google.com/?q=Reinhard-Baumeister-Platz+1+%0D%0A76131+Karlsruhe+%0D%0AGermany&entry=gmail&source=g>
>> 76131 Karlsruhe
>> Germany
>>
>
>