Low Flow Alarm Unit for VA Flow Meters
This report describes an evaluation of three Lee-Dickens BU191 low flow alarm units (serial no(s): 09384/01/16, 09384/01/17 and 09384/01/18). The alarm units have been connected to one variable area flow meter (VA-meter) each according to the following table; Low Flow Alarm Unit Variable Area Flow meter Name Serial no. Name Serial no. Model BU191 (A) 09384/01/18 Yokogawa RAGK41 224955 RAGK41 * BU191 (B) 09384/01/16 Emerson/Mobrey KDG1100 KS000693-01 1100VAA1A2A1CO BU191 (C) 09384/01/17 Emerson/Mobrey KDG1300 KS018162-09 1300VAA1A2A1CO *) Full model name: RAGK41ROSSSSSBEK631GMUBGN*A/G12 Each alarm unit and its corresponding VA-meter can be viewed as a separate system as follows; 1. Flow meter with adjustment valve 2. Limit sensor (DUT) 3. Low flow alarm unit (DUT) During the tests the relay outputs of the alarm units were connected to a USB I/O board, linked to a PC with a custom made control/analysis software.
3.9 - Flow switches
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