HIGH PRESSURE AIR SWITCHING AIR VALVE P RESTRICTOR .007” BV1 BV2 C NC NC RESTRICTOR VOLUME ASV1 PLUGGED CHAMBER NO S1 .007 in VC MN1 PRV1 PRESURIZED S2 20 PSIG DEPRESSURIZED NC ASV2 PRV2 BOURDON VENT P VARIABLE B M I TUBE AIR C NC TO SUIT BT1 SWITCHING PLUGGED RC2 .007 in VALVE BEAKER B PT1 NO P H BK1 AIR OFF PRESSIRIZES TUBE VC OD AIR ON DEPRESSURISES TUBE .007 in 4.24 FLUID mm B M I MN2 .005” P TO CHECK 1:3.33 BIASING RELAY LOGGER VALVE RC1 ID 9.525 M B .007 in mm BR1 4 lb IN = 13.3 lb OUT BV3 T 0 BV4 NO LOGGER NC ACTUATOR 5lb - 10lb ACTUATOR 5lb - 10lb -1- No air pressure; therefore, Bourdon tube (BT1) is relaxed, hitting sensor (S2). -2- Open ball valve (BV1) pressurizing beaker (B1). Ball valve (BV3) allows fluid pressure to Bourdon tube (BT1), flexing BT1 to hit sensor (S1). BT1, via S1, causes air switching valve (ASV2) to position NO to C. -3- Open ball valve (BV2), allowing pressure to build via S1 to ASV1’s pilot, closing ASV1’s NO port. -4-BT1 opens S2, causing pressure from PRV1 to go through ASV2 to switch fluid BV3 and BV4 and to the logger. BV3 closes BT1 to beaker (BK1) and opens BT1 the 9.525 mm ID clear tube VIA BV4, depressurizing BT1. Biasing relay BR1 coordinates BV3 and BV4 so only one can be open at a time and there is two pound dead span where both are closed during switching. -5- BT1 relaxes and returns to its depressurized position. -6- If a volume increase is experienced by BT1 on pressurization, fluid will flow to the 9.525 mm ID tube on depressurization. -7- On depressurization BT1 will return to hit S1 and close S2. ASV2’s NO port will close. S1 will open opening ASV1’s NO port to C. -8- Microneedle valve (MN1) will determine the rate of cycles as BV3 and BV4 change their porting on switching. -9- This creates a reciprocating cycle. Note the “WG level change of the 9.525 ID tube after a few cycles. -10- If it appears that no level change is experienced, continue experiment. (If level increases; calculate % change.) -11- Adjust MN1 to establish a fixed number of cycles per minute. -11- The change in fluid in the 9.525 mm ID tube is sensed by pressure transmitter (PT1) via the 4.24 OD tube with air slowly bubbled into it via MN2. Minimum bubbles maintained while keeping the 4.24 OD tube the waterless. -12- Program trend reader to read cycles over prolonged period of time and calculate level change for 1,000 cycles. -13- The open area to atmosphere of fluid in the 9.525 ID tube with 4.24 mm tube inserted is .57107 cm². -14- Testing indicates that one drop of water alters the level in the 9.525 mm ID tube by .02” WG. -15- .02” WG change equals a volume change of about .029 cm³ (.029 gram), producing a 3 PSIG output change from RC1, which has an input range of 1.0” WG. -16- On the Trend reader each PSIG represents 1.49 volts which can be subdivided into thousands of a volt. -17- The test equipment is able to record volume changes of about .000001 cm³ (.000001 gram of pure water). 5.0 2.5 7.5 “WG 0 10 .50 . .25 .75 “WG 0 1.0 .50 .25 .75 “WG 0.0 1.0 12.222
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