Finally, the problem is solved. It was "simple", but really gave us a hard
time to realize it. The reason is that the new potentiometer has opposite
pin1 and pin2, which have fixed 100 k ohm between them. I didn’t notice it
when soldering it first time. I just followed the order of the wires at the
failed potentiometer (same at the sample side) – Green, White and Red.
However, the correct order of the new potentiometer wires is White, Green
and Red. This is why bellows was at 100% but Isodat showed at 0% and didn’t
allow me to adjust the bellows.


Wei Huang


On Wed, May 10, 2017 at 2:58 AM, waseem raza <[log in to unmask]>
wrote:

> Hi wei
>
>
>
> You better try with what i suggest you earlier do manually several times.
> I have faced this problem long back. These kind of issues are not
> permannent and so there is no fixed solution. I experienced that It all
> depends on our trials. I suggest
>
> 1) if you have taken backup before changing potentiometer, load that in
> version handler and restart the system.
>
> 2) apply little grease on wheel belts and rotate manually.
>
> 3) put ON dual inlet heater for some time.
>
>
>
> Regards
>
> Waseem Raza
>
> CSIR-NGRI
>
>
> From: "Wei Huang"[log in to unmask]
> Sent:Wed, 10 May 2017 08:17:20 +0530
> To: [log in to unmask]
> Subject: Re: [ISOGEOCHEM] Thermo bellows problem - cont
>
> First of all, I appreciate all the online & offline helps.
>
>
> >
> Now, another bellows problem. It started from an "easy" problem, I think,
> - bellows leak. I bought a new one eventually, so that the instrument could
> start running samples ASAP. After the leak bellows replaced, we found the
> potentiometer failed. Then, replaced it with a new one, too. Now, it could
> do "hardware bellows calibration" and the bellows could move from
> 100%-0%-100%. But, it stopped moving during "signal calibration" and stayed
> at 100%. However, Isodat showed this bellows position at 0%. I couldn't
> adjust bellows on Isodat. Whatever percentage I set on Isodat, it went back
> to 0% or 100% sometimes (on Isodat) automatically. The "true" bellows
> didn't respond to Isodat at all. I tested the resistance of the new
> potentiometer, between pin3 and pin1 or pin2. The resistance did change
> continuously when rolling the brass wheel.
>
>
> >
> I also swapped the cable (connecting bellows and electronic board) with
> the sample side one. No help at all. I'm kind of running out ideas for
> trouble shooting. Anything else can I test?
>
>
> >
> Wei
>
> >
>
> >
> Sent from my iPhone
>
>
> >On May 6, 2017, at 12:58 PM, Antonio Celso Gomes Jardim <
> [log in to unmask]
> <[log in to unmask]" target="_blank">http:///ajaxprism/writemail?mode=mail_to_individual&[log in to unmask]>>
> wrote:
>
> >
>
> >
>
> It a 100 kOhms 10 turns any local store can supply it or a similar to
>
> http://www.bourns.com/docs/Product-Datasheets/3549.pdf?sfvrsn=0
> <//www.rediffmail.com/cgi-bin/red.cgi?red=http%3A%2F%2Fwww%2Ebourns%2Ecom%2Fdocs%2FProduct%2DDatasheets%2F3549%2Epdf%3Fsfvrsn%3D0&isImage=0&BlockImage=0&rediffng=0&rogue=a96a1fd1710e9773f7f6f7a0b2d29d228f0599c6&rdf=VnRWNQN3Xj4GPlBpVloGPFpoBHEKJ1E9>
>
> Regards
>
> -------- Mensagem original --------
> Assunto: Re: [ISOGEOCHEM] Thermo bellows calibration - potentiometer
> Data: 04/05/2017 14:51
> De: Wei Huang <[log in to unmask]
> <[log in to unmask]" target="_blank">http:///ajaxprism/writemail?mode=mail_to_individual&[log in to unmask]>
> >
> Para: [log in to unmask]
> <[log in to unmask]" target="_blank">http:///ajaxprism/writemail?mode=mail_to_individual&[log in to unmask]>
> Responder para: Stable Isotope Geochemistry <[log in to unmask]
> <[log in to unmask]" target="_blank">http:///ajaxprism/writemail?mode=mail_to_individual&[log in to unmask]>
> >
>
> Many thanks to NJ, River and Waseem.
> After several tests, it looks like the potentiometer is failed. Does
> anybody know its part number? or it will be great to send me a link. Thank
> you in advance.
> Wei
>
>
> >
> On Thu, May 4, 2017 at 12:28 AM, waseem raza <[log in to unmask]
> <[log in to unmask]" target="_blank">http:///ajaxprism/writemail?mode=mail_to_individual&[log in to unmask]>
> > wrote:
>
> >
>>
>> Hello
>>
>> >
>>
>> > the problem is that your software is not reading the exact position of
>> bellow and so reaching to 100
>>
>> > every time. you try to calibrate first manually.. i mean first rotate
>> the bellow till zero position
>>
>> > manually and then set the zero position of bellow on computer screen.
>> then rotate the bellow manually
>>
>> > till 100th position and in the same way set the 100 position by
>> computer system. try to do it several
>>
>> > times i hope it will help..after this shut down the software and
>> restart the system again.
>>
>> >
>>
>> > Regards
>>
>> >
>>
>> > Waseem Raza
>>
>> > CSIR-NGRI
>>
>> > Hyderabad
>>
>> > India
>>
>> >
>>
>> > On Thu, 04 May 2017 00:21:52 +0530 Wei Huang wrote
>>
>> > >Hi NJ,
>>
>> > Yes, I did. Before the calibration, I put the guided pin at 5 of 10
>> turns. However, the software didn't
>>
>> > let me to change the bellows setting. Whatever I set on the bellows, it
>> went back to 100%. So, I
>>
>> > decided to put the guided pin at 100% (~10 turns), to try hardware
>> calibration first.....
>>
>> > Wei
>>
>> > On Wed, May 3, 2017 at 2:19 PM, Wan, NJ (Taipei) wrote:
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>>
>> > Hello
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>>
>> > Before hardware calibration, did you adjust the variable
>> resistance(5/10 cycles) and the bellow to the
>>
>> > middle position, and set the percentage of bellow about 50%?
>>
>> >
>>
>> >
>>
>> >
>>
>> > NJ
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>>
>> > 寄件者: Stable Isotope Geochemistry 代表 Wei Huang
>>
>> >
>>
>>
>> > 寄件日期: 2017年5月4日 上午 01:59:56
>>
>> >
>>
>> > 收件者: [log in to unmask]
>> <[log in to unmask]" target="_blank">http:///ajaxprism/writemail?mode=mail_to_individual&[log in to unmask]>
>>
>> >
>>
>> > 主旨: [ISOGEOCHEM] Thermo bellows calibration
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>>
>> > Dear Isogeochem
>>
>> >
>>
>> >
>>
>> >
>>
>> > Bellows question again!
>>
>> >
>>
>> >
>>
>> >
>>
>> > I have a thermo delta V plus with dual inlets. Recently, I just
>> replaced the leak bellows with a new
>>
>> > one. After put everything back, I tried to calibrate the bellows.
>> However, the new bellows didn't
>>
>> > respond correctly to the "hardware" calibration. It only
>>
>> > spun a little bit, and spun back to original spot. But the software
>> still showed "calibration
>>
>> > completed". The other untouched bellows responded correctly.
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>>
>> > Has anybody had this problem before? Any comments and suggestions are
>> well welcome. Thank you.
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>>
>> >
>>
>> > Wei Huang, Ph.D.
>>
>> >
>>
>> > Stable Isotope Lab Manager
>>
>> > Lamont-Doherty Earth Observatory of Columbia University
>>
>> >
>>
>> >[log in to unmask]
>> <[log in to unmask]" target="_blank">http:///ajaxprism/writemail?mode=mail_to_individual&[log in to unmask]>
>>
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>>
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>>
>> >
>>
>> >
>>
>> >
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