Meriam 70H_72H High Pressure Wet Tap Accutubes with Integral 3-Valve Head and Optional RTD - Manual (Page 11)

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4.2.4 Series 10A and 11A inline sensors are bi-directional devices. They can be
installed with flow in either direction through the unit. The Series 12A must be
installed with the balancing valve downstream of the metering section.
4.3 INSERTION FLOW SENSORS, COMPRESSION FITTING: SERIES 20T, 21T, 22L, 23L,
40H, 41H, 42H & 43H
4.3.1
Perform the general preparation steps as outlined in Section 4.1.1 through 4.1.6.
4.3.2
Slide fitting nut onto the probe with the threaded end facing the tip of the probe.
4.3.3 Slide the ferrule onto the probe so that the angle of the taper slopes downward
toward the probe tip.
4.3.4 With the fitting body already assembled and tightened onto the threaded
coupling, insert the probe into the line.
4.3.5 Slide the ferrule into the fitting body.
4.3.6 Thread the nut onto the fitting body finger-tight.
4.3.7 Properly position the probe so that the High-pressure connection (side
connection) is pointing upstream within the tolerances as shown in Figure 4.1.
4.3.8 Withdraw the probe tip from the opposite end of the pipe 1/16” for line size 12”
and smaller, and 1/8” for larger lines sizes. This step properly locates the
sensing port holes and allows for thermal expansion of the probe.
4.3.8.1 The Series 21T, 23L, 41H & 43H double support Accutubes include a
specially machined support plug. Be sure that the flow sensor is fully
inserted into this plug and not simply resting on top. Rotating the
probe and/or the plug while inserting the probe will aid in alignment.
Be sure to retighten the plug and provide clearance as listed in 4.3.8.
4.3.9 Tighten the nut with a wrench an additional number of turns as follows. Hold
the fitting body with a second wrench to prevent the body from turning. It is
helpful to mark the nut to facilitate counting the number of turns.
CAUTION: DO NOT OVERTIGHTEN!
Sealing turns from hand-tight required
Stainless steel fittings on probe
3/8” through 1” O.D............................................1-1/4 turns
Brass fittings on probe diameters
3/8” and 3/4”.......................................................2-1/4 turns