The indication unit IndiTop from Alfa Laval is designed as a simple and easy to use, electrical feedback unit for Laval butterfly and single-seat valves. It is compatible with all major PLC (Programmable Logic Controller with PNP/NPN interface). It is for use in food, dairy and brewery installations and in biopharmaceutical applications.

Working principle

IndiTop is a unique “No Touch” sensor system without any mechanical adjustments. It is used to supervise pneumatic valves and is easily mounted on top of the valve actuator. IndiTop ensures a quick and easy setup either by the easy “5 push setup” or remotely from the PLC system; Visual indication through LEDs are constantly displaying the current valve position and power ON and the unit will be able to send feedbacks in both DC and AC about the valve position through an encapsulated cable.

For cable version the selection of PNP or NPN is done by external electrical wiring and for the plug version the selection is done by Item no. See also “Basic Design”. It is interchangeable with Alfa Laval side indication (Hall switches) without rewiring the plug connection.


How It Works


IndiTop consists of a valve indication housing, proven no-touch, set-and-forget sensor system with light-emitting diodes (LEDs) and valve control sensor board for connection to the PLC (Programming Logic Controller) system.

Operating principle

The sensor system calculates the angle between the axial magnetic field produced by an indication pin mounted on the valve stem. This provides indication with an accuracy of ± 1mm of the position of the valve at any given time through the use of microchip sensors.

The IndiTop unit transmits status and condition to any PLC system using one of two DC/AC or PNP/NPN digital feedback signals. LEDs display the current main valve position and on/off power status at all times.


Three versions based on fixed cable lengths are available for connection: 5 m, 10 m or 0.5 m with an M12, 5-pin stainless steel plug connector including the plug counterpart.

Ease of installation

Installation is straightforward; no special expertise, adapters or tools are required. IndiTop fits onto all Alfa Laval sanitary actuators equipped with mushrooms. Simply press a five-button startup sequence to initiate foolproof manual setup. Or facilitate setup using the optional remote control wire function in combination with the PLC system. No dismantling is required.

Make an Online Enquiry