Dear Mark,
We use a home-built pressurization device consisting of a 0-25 liter per minute rotameter flow gauge, a Norgren model 11-018-146 precision pressure regulator (inlet: max. 10 bar, range 0.07-0.7 bar or 1-10 psig) and an Ashcroft pressure gauge (0-5 psig / 0-35 kPa). None of these components has ever failed during over 10 years of use. The pressure gauge and flow meter are both available from Cole-Parmer. The flow meter is useful for detecting if the liquid helium is exhausted before the magnet is full; the helium gas flow rate will increase dramatically once there is no liquid helium separating the pressurizing gas and the inlet of the transfer line. Be sure to use a flow meter with a needle valve since this valve may need to be adjusted to prevent oscillations in the flow rate during filling.
Best regards,
Ken Fishbein
Kenneth W. Fishbein, Ph.D.
Facility Manager, MRI Section
National Institute on Aging
National Institutes of Health
251 Bayview Boulevard
Suite 100, Room 04B120
Baltimore, MD 21224
(410) 558-8512
FAX: (410) 558-8376
kf31x_at_nih.gov<mailto:kf31x_at_nih.gov>
From: Mark Swanson [mailto:mark94131_at_gmail.com]
Sent: Thursday, January 08, 2015 4:29 PM
To: ammrl_at_ammrl.org
Subject: AMMRL: Helium Gas Delivery Apparatus
Hi everyone,
I've been using a homemade device to pressurize our liquid helium when we do our helium fills. It has a flow regulator and a 0-15 psi gauge on it but the gauges break frequently. Does anyone know if there's a commercially available all-in-one apparatus such as this or does everyone make their own? Otherwise, can anyone recommend a good low pressure helium gauge that won't break?
Thanks,
Mark Swanson
Received on Thu Jan 08 2015 - 14:23:09 MST