A tubing manufacturer supplies custom tube assemblies to a bottling and canning equipment manufacturer for use in their pneumatic controls system. For quality control the tube assemblies are tested for leaks and blockage. A
technician will perform a flow test to verify that the tube assembly is free of internal obstruction.


50D-9-D-A6-G0 Thermal Mass FLO-METER
A-115VAC Power Adapter


McMillan Model 50D Thermal Mass FLO-METER has an integrated Liquid Crystal Display (LCD) and provides an analog output signal which is proportional to the flow rate. The maximum pressure rating is 100 PSIG. The Power Adapter connects to the FLO-METER and an AC power outlet, plug and play.


Regulated dry air (18-20 PSIG) flows through the needle valve, Model 50D FLOMETER and tube assembly to the atmosphere. The technician adjusts the flow to approximately 3 L/minute as per the display. The 0-20 inches/water manometer will detect a pressure increase of approximately ½ inch/water when the tube has an obstruction. If the tube assembly is not obstructed it will be moved to the next station for leak tests that do not make use of the Model 50D FLO-METER.


McMillan Company’s patented thermal mass design provides accurate repeatable results with minimal zero drift. Metal construction, compact size, integrated display and reasonable price make the Model 50D an ideal choice for this customer’s needs. Units are available with NIST-Traceable calibration. McMillan Company also offers a recalibration service. Custom configurations are available to OEM customers.


Figure 1 illustrates the flow path of the fluid system. Figure 2 illustrates the wiring of the system.

FIGURE 1 – Flow Path of Fluid System

FIGURE 2 – System Wiring