The electrical connectors used on sensors can vary greatly. The following list describes the electrical connectors commonly found on Hamilton process sensors. See each connector type and learn where they are used to decide which one fits your needs.

VP (VarioPin)

This is a common connector used throughout the Hamilton sensor product line. VP is abbreviation for “VarioPin”. The VP designation often includes a number referring to the number of exposed poles on connector head. Example VP6 = 6 pole. VP connectors are fully autoclavable with IP68 protection rating.


K8 / K9 connectors are typically used on traditional pH / ORP sensors which lack temperature compensation. These connectors have a two pole design comprised of the center core and outer metallic threaded connection.

S7 & S8

S7 and S8 connectors are typically found on traditional pH sensors which no temperature compensation. They are the same basic design however S8 connectors have PG13.5 mounting threads, while S7 connectors do not. These connectors are recessed thus care must be taken to avoid moisture getting trapped which could lead to a short circuit.


Metallic threaded M12 connectors are found on Hamilton VisiFerm mA and VisiTrace mA Dissolved Oxygen Sensors, as well as Hamilton’s Wi 2G Bluetooth Wireless Adapter. M12 adapters have either 4 or 8 poles hidden within the socket. Since the poles are recessed, avoid getting moisture inside the connection.


The T82 connector is sometimes known as a D4 connector. It uses a twist lock design to secure the cable to the sensor. These connectors are less common and only found on the Hamilton OxyFerm FDA Dissolved Oxygen Sensors.


These inductive electrical connectors are only found on digital pH sensors using Memosens technology. They use a twist lock design to affix the cable. There are no exposed metallic connections on Memosens connectors.

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