One must usually de-ice the sensor in place. It is likely frozen into a block of ice which extends to other mechanical components of the helium vessel. Additionally, most magnets do not have enough overhead clearance to remove the sensor. It is the longest component of the magnet, and is installed before the magnet is raised upon its legs. Quenching a magnet during ice removal is a necessary risk.
Cheers, -Hirsch
Jerry Hirschinger, NMR Instrumentation Specialist
Purdue Interdepartmental NMR Facility
560 Oval Dr. West Lafayette, IN 47907-2084
Office: Wetherill 365A
Phone / Fax: (765) 494-5288 / 494-0239
Cellular: (765) 427-3034
-----Original Message-----
From: Jordi Redondo [mailto:jredondo_at_eqesteve.com]
Sent: Monday, February 02, 2015 5:42 AM
To: Zhao, Chunqing
Cc: ammrl_at_ammrl.org
Subject: RE: AMMRL:
Hi,
We have a similar problem some months ago in an Agilent system, and it provoked a quench, since the helium level was much lower than the level reading. The Agilent engineer concluded that the sensor had some ice on it and for that reason the reading was wrong. So, I suggest you to call your local engineer to remove the sensor and clean it.
Best regards,
Jordi Redondo
Spectroscopy Manager
Esteve Química
R & D Dept.
Barcelona
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CONFIDENCIALIDAD: La información contenida en este mensaje es confidencial y para uso exclusivo del destinatario. Si ha recibido este mensaje por error, le agradeceremos nos lo indique y proceda a su eliminación. Para mas información sobre protección de datos personales visite www.eqesteve.com/lopd.
-----------------------------------------------------------------------------------------------------------------------------
De: "Gudzon, Ana" <Ana.Gudzon_at_Covidien.com>
Para: "Zhao, Chunqing" <nelson.zhao_at_unf.edu>, "ammrl_at_ammrl.org"
<ammrl_at_ammrl.org>,
Fecha: 30/01/2015 19:01
Asunto: RE: AMMRL:
Maybe your helium sensor is frozen or you got some ice on the sensor or
inside the . Bruker has a program that send some electrical impulses that
it melts. I am not sure about Agilent instrument.
From: Zhao, Chunqing [mailto:nelson.zhao_at_unf.edu]
Sent: Thursday, January 29, 2015 9:21 AM
To: ammrl_at_ammrl.org
Subject: AMMRL:
Hi All:
Our Aglient 500 VNMRS system (2007) helium level reading does not change
for the past several days. It did not change even I put the meter in the
fill mode for 5 min. Any idea what I should do.
Thanks,
Nelson Zhao
Analytical Facility Manager
Chemistry Department
University of North Florida
Building 50/3610
1 UNF Drive
Jacksonvill, FL 32224
Ph. 904-620-1962
Fx. 904-620-3535
© ESTEVE (2015) & CONFIDENCIAL
CONFIDENCIALIDAD: La información contenida en este mensaje es confidencial y para uso exclusivo del destinatario. Si ha recibido este mensaje por error le agradeceremos nos lo indique y proceda a su eliminación.
CONFIDENCIALITAT: La informació continguda en aquest missatge és confidencial i per a ús exclusiu del destinatari. Si ha rebut aquest missatge per error li agrairem ens ho indiqui i procedeixi a la seva eliminació
Received on Mon Feb 02 2015 - 09:47:08 MST