Retrofitting a DN2 Filling Line With the Endress Hauser Promag H 300 Flowmeter

Retrofitting a DN2 Filling Line: From Timed Shots to Measured Volume

Promag H 300 in DN2 (1/12 in): full-bore PFA liner in a stainless steel hygienic housing.

Most small filling machines do not start life with a flowmeter. They start with a timer: open the valve for a fixed number of milliseconds and hope the product temperature, tank head and pump wear stay where they were on commissioning day. The result is overfill on warm product, underfill on cold product, and a quality team that compensates by setting the target high and giving product away. Fitting a DN2 electromagnetic sensor closes that loop.

Why the DN2 Promag H 300 fits this duty

The sensor is built around a full-bore measuring tube with a PFA liner, so there is no constriction to slow the fill or trap product between batches. Order code 5H3B02-AAIBAEAFBAFDCS0BA2 is the stocked configuration. Because the transmitter is the same platform used on the larger bores of the series, a plant that already runs Promag H instruments does not add a new parameter set or a new spare part family for the small line.

Retrofit sequence that avoids downtime

• Measure the existing dosing line: internal diameter, straight run available, and whether the pipe is stainless or plastic
• Confirm conductivity, typically 5 microsiemens per centimetre or more, and around 20 for demineralised water
• Select the hygienic connection that matches the existing union, so no welding is required on the product side
• Wire the pulse output into the existing filler controller and switch the shot from time-based to volume-based
• Run three validation fills at low, nominal and high target volume before releasing the line

What the retrofit changes in practice

Points that decide success

Keep the tube full at zero flow and allow roughly 5 DN upstream and 3 DN downstream; on very short filling drops, mount the sensor in the vertical run where product cannot drain away from the electrodes. For plastic or lined piping, fit grounding rings as part of the same order. Empty pipe detection should be enabled so the controller does not count air as product at the end of a tank.

Stock and support

The DN2 unit is held in stock with a minimum order quantity of one piece, T/T or L/C payment terms and a 12-month warranty. Send us the fill volume, cycle time and a photo of the existing dosing line, and we will confirm the connection and the option string before shipment.

Contact our instrumentation team for stock confirmation, datasheets and sizing support.