https://pfspipe.ipmu.jp/jira This file is an XML representation of an issue en-us 8.3.4 803005 13-09-2019 https://pfspipe.ipmu.jp/jira/browse/INSTRM-380 Instrument control development <p>The flow meter has been showing "0" flow since it was attached to Subaru Cs flange. According to the <a href="https://pfspipe.ipmu.jp/jira/secure/ViewProfile.jspa?name=chyan" class="user-hover" rel="chyan">chyan</a> , the meter showed the proper value (~3.5 Hz), but decreased 0 soon. When we inspected the flow meter 8 June, it is fount that the flow is not too slow to detect the pulse with the current algorithm. Therefore, the algorithm should be optimized to detect slow pulse at Subaru telescope.</p> <p> </p> <p>Besides, the unit of the flow, for which [ Hz ] used currently, should be changed to see the "flow" more directly. The calibration factor (K-factor) is written in the label of the device, according to the vendor's manual.  </p> INSTRM-380

Optimize algorithm of the flow meter to Subaru environment

Task Normal Done Done chihyi yuki.moritani EngRun Sun, 10 Jun 2018 22:39:21 +0000 Thu, 13 Oct 2022 04:37:12 +0000 Thu, 13 Oct 2022 04:37:12 +0000 ics_mebActor 0 2 <p>The flow meter generates pulse from the rotor. If the trigger interval is longer than 10s (in other word slower than 0.1Hz), then the output will be 0.0Hz. Otherwise it should be fine.</p> <p>In the new code(peb, meb), I have added a new keyword Flow_meter for the flow speed in Gal/min. The original one is called Flow_rotor.</p> <p>One thing to pay attention is the spec for this flow meter, it says the flow range is 0.07-5 Gal/min, or 1.6-118Hz.</p> <p>(Notes) <br/> As of 2021 Dec, STS still shows only Hz, so we need to send flow rate, too. (For PFI, both flow rate and rotation frequency are sent to STS.)</p> <p>Should this ticket be re-assigned to a person for STS?</p> <p>Well, maybe I think we should create a new ticket for STS... </p> <p>And in regard to flow rate, I think the range is limited by spec of the hardware itself,,, not by algorithm/software.. correct? If this is the case, we can close this ticket.</p> <p>In the software, the accuracy for the rotor speed is 0.1Hz. So, if the rotor rotates slower than 0.1 turn/s, then the flow speed is 0.</p> <p>OK. And we measured flow rate in November: 0.29 lpm = 0.077 gpm. The value was almost the lower limit... (and that's why rotation was 0.)</p> <p>So I'll close this ticket and file another for STS.</p> Development Rank 0|02qpqk:7