Sinking and Sourcing

Sinking and sourcing are terms used to describe how a load (the device being turned on or off) is powered in regards to the sensor.

Sinking is the most common and it involves the switching of load current (power) supplied by a power source external to the sensor. With this configuration, current passes through the load first, through the output switch of the sensor second and finally to ground. Sensors with sinking output switches the negative leg of the circuit.

Sourcing refers to a configuration in which the sensor is the source of the current required to power the load. In a sourcing situation, current supplied by the sensor passes through the load second and then to ground. Sensors with sourcing output switches the positive leg of the circuit.

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Boiswood Distributing for Kobold

Boiswood is now distributing for Kobold.

The KOBOLD Messring GmbH is one of the leading international instrumentation engineering enterprises specialized on monitoring, measuring and regulating the physical quantities of flow through, pressure, level and temperature.

Boiswood are looking to display select Kobold products on this website by January 2017.

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The Setra 267 Pressure Transducer

Setra’s Model 267 is the most rugged high accuracy, low differential pressure transducer on the market. It delivers accuracies of ±0.25%, 0.4%, 0.5% and ±1% FS and pressure ranges from 0.1” W.C. up to 100” W.C. The 267 is housed in a robust, NEMA 4 rated enclosure and has an optional static pressure probe reducing installation and material costs. The 267 is offered with an optional LCD display and a standard accuracy of ±0.5% making it ideal for high accuracy Pharmaceutical applications.


Customisation is Standard

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The XLS-1 Ultrasonic Level Sensor

Advanced ultrasonic level sensing technology

Uniquely designed to reduce customer downtime, the rugged and compact XLS-1 with microcontroller has no moving parts and reliably senses oil, water and harsh chemicals while ignoring foam and condensation.


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The New Mankenberg DM618 and DM618Z

These are pressure reducing, diaphragm-operated, spring-loaded and balanced proportional valves for high flow rates. The valve body is made of cast steel, the internal parts are of CrNiMo steel. The valve cone is soft-sealed (up to 130 °C) for liquids and gases or with metallic seal for steam (up to 250 °C). Self-acting pressure reducers are simple control valves offering accurate control while being easy to install and maintain. They control the pressure downstream of the valve without requiring pneumatic or electrical control elements.

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