Installation Considerations for Insertion Flow Meters

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An insertion flow meter, although easier to install than an inline flow meter, requires proper installation and a well-developed flow profile to perform correctly. Sage offers a couple of mounting hardware sets that provide tremendous benefits to the thermal mass flow meter.

Sage Valve Assembly Operation

natural gas flow meter
Sage Prime pictured with valve assembly

Sage Metering offers valve assemblies (PNs SVA05 and SVA05LP) as optional mounting hardware sets for the insertion-style flow meters. The mounting sets permit the user of the meter to service, clean, verify calibration, or relocate the meter without having to disrupt or “shut- down” the process. The probe insertion depth is adjustable which permits the sensor to be situated at the center of the pipe which optimizes meter accuracy. The ball valve seals off process gas leaks at the point of insertion when the probe assembly is removed. The assembly includes a valve, threadolet, and compression fitting with Teflon ferrule, a cable restraint, and two collar clamps.

A threaded half coupling (3/4″ FNPT) correctly sized to accommodate the isolation valve retractor assembly must be fitted to the pipe or duct to which the insertion probe will be inserted. Avoid T-Fittings since they disturb the flow profile, and reduce the measurement area. You may require to direct the threading together (or with necessary bushings) of the retractor assembly. In other cases, the threadolet must be welded in place, and a clearance hole must be drilled through the pipe/duct to accept the probe assembly. If the pipe or duct is under pressure during installation, a hot-tap drill may be required.

Compression Fitting Operation

A bored through tube fitting, correctly sized to accommodate an insertion probe’s specific OD, can be purchased as an option from Sage Metering or provided by the user (download  Valve assemblies). Before installation, drill a clearance hole in the pipe or duct to accommodate the insertion probe assembly. A fitting (1/2″ FNPT) is then welded in place or threaded into the half-threadolet which has been welded to the pipe or duct. The probe insertion depth is adjustable to permit the sensor to be located at the center, which optimizes measurement accuracy.

Installation Instructions

    1. Insert tubing into the tube fitting.
    2. Make sure that the tubing is positioned correctly per the user manual pages 14 & 15.
    3. Due to the deviations of tubing diameters, a common starting point is desirable. Therefore, tighten the nut until the tubing will not turn by hand or move axially in the fitting.
    4. Mark the nut at the 6 o’clock position.
    5. While holding fitting body steady, tighten the nut 1-1⁄4 turns to the 9 o’clock position.

This post was created from the Sage Prime User Manual. If you would like the complete manual, refer to our User Manuals page for the most recent version.

Other topics from the Sage Prime Manual you many be interested in are:

How do I clean my thermal mass flow meter sensor?

My Sage flow meter was damaged in shipment.

How to Install and Mount my Sage Prime Thermal Mass Flow Meter?

Inline Flow Meter Installation Considerations

Common Diagnostics for Sage Prime Mass Flow Meters

Flow Profile and Installation Considerations for Insertion Flow Meters

Sage In-Situ Verification Procedure

Sage Mass Flow Meters Warranty

Sage Prime Thermal Mass Flow Meter Features and Benefits

Modbus Protocol and Function Codes

Returning Your Sage Flowmeter via Special Delivery

Sage Metering’s Cancellation and Return Policy

HART Protocol and Access Keys

Correction Factors for Biogas Variation From Original Calibration


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