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]" target="_blank" rel="external">[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

Regards

-------- Mensagem original --------

Assunto:	Re: [ISOGEOCHEM] Thermo bellows calibration - potentiometer
Data:	04/05/2017 14:51
De:	Wei Huang <[log in to unmask]" target="_blank" rel="external">[log in to unmask]>
Para:	[log in to unmask]" target="_blank" rel="external">[log in to unmask]
Responder para:	Stable Isotope Geochemistry <[log in to unmask]" target="_blank" rel="external">[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]" target="_blank" rel="external">[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]" target="_blank" rel="external">[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

>

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