>Date: Tue, 26 Jan 1999 17:08:14 -0500 >From: PETER BERCZ <BERCZ.PETER@EPAMAIL.EPA.GOV> >Subject: Advice on INNOVA coolant flow sensor. >To: Cytometry Mailing List <cytometry@flowcyt.cyto.purdue.edu> >MIME-version: 1.0 > > >** Reply Requested When Convenient ** > >To anyone who may have come up against this problem: On my Coulter >EPICS Elite I have an INNOVA 305 Argon Ion laser, only about 100 >hours on it. The water flow to the power supply via a new filter is >about 3.5 gal/min (verified by measuring flow rate by volumetry). In and >out flow to and from the power supply is correctly hooked up, I know it >can cause problems if it is hooked up in reverse. The filter is not clogged, >the hose is not crimped. Still the remote control display registers 0 >flow, consequently the laser cannot be powered up. Did anyone out >there encounter this problem? While I am in touch with Coulter, maybe >someone knows, Is there a valve or a flow activated switch that got >stuck? Thanks for any advice. Peter Bercz, USEPA/NERL EERD >Cincinnati Greetings Peter, I had this problem on an INNOVA 90 unit on our old EPICS C, I tracked the problem down to the flow sensor in the power supply box, if I remember correctly (this is going back some years) the sensor consists of an impeller connected to a rotary transducer which is driven by the cooling water flow through the passbank array. Now, under some conditions (infrequent use/closed circuit cooling) the impeller, which rotates in a fairly close-tolerance housing becomes clogged, the solution is to remove the cover to the flow sensor and clean inside. Best wishes Arnold. -------------------------------- Arnold R Pizzey Department of Haematology UCL Med. School 98 Chenies Mews London WC1E 6HX, England Tel 44-171-209-6234 FAX 44-171-209-6222 a.pizzey@ucl.ac.uk -------------------------------
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