THE SAMPLING CONNECTION

1. THE SAMPLING CONNECTION The most frequent cause of poor test results is an nection. We recommend permanently installed stainless steel in our Bulletin No. 68-3. incorrect sampling con- connections as described Keep in mind that any branch connection in a piping system is a perfect dirt trap in the case of a sampling connection, no flow takes place, except when a contamination test is run. Therefore, the internal flow passages must be small in diameter so that a reasonably high velocity will take place while flushing. Metal surfaces must be corrosion resistant so that no rust will be generated in sampling connection. If a permanently installed sampling connection is not present where a test is to be run, use the parts from the MiniMonitor Kit: 1. Install the probe (9) in a convenient pipe fitting with the FLOW arrow (stamped on one hex flat) pointing in direction of pipeline flow. Use reducing bushings (4 or 7) as needed. Use Teflon pipe thread sealant tape. Wrap one layer around thread (male end). Pull slightly to force tape into thread, pull harder and it tears apart at the end of one wrap. Then screw threaded joint together. 2. Mount the quick disconnect coupler (5) on the probe, using pipe coupling (11) 3. Flush the sampling connection that was assembled in steps 1 and 2 by in- serting the male fitting on the end of hose (1) in the sampling coupler. Connect and disconnect several times to thoroughly flush all fittings. 2. ASSEMBLING THE M I N IM oNITOR K I T 1. 2. 3. 4. 5. 6. 7. Install the by-pass hose (10) and lever-type quick disconnect (14). Using Teflon tape, screw by-pass tee (3) into the bottom cap of the monitor housing (8). Next, screw threaded end of hose 1 into the by-pass tee (3). Open the monitor housing (8) by unscrewing the bottom cap. Remove colored plastic plugs from the plastic monitor (2) and install it on bottom cap. An O-ring in the bottom cap seals. around the small hub of the plastic monitor. BE SURE THE SPOKED or gridded SIDE OF THE PLASTIC MONITOR IS TOWARD THE BOTTOM CAP. Screw the bottom cap on the monitor housing 8 but be certain that the small O-ring is in position around the short tube in the monitor housing. Now connect the bypass quick disconnect (14) to the side fitting of the by-pass tee (3). NOTE : The above procedure applies to Model GTP-172. If you have Model GTP-169, the hose (1) screws directly into the bottom cap of the monitor housing.