Tilt sensors and inclinometer technology This article looks at how we have built on the MEMS (Micro-Electro-Mechanical Systems) sensor technology and have created a range of submersible, compact and intrinsically safe tilt sensors. Sensing changes in angles and direction is the main function of a tilt sensor or inclinometer, and the most commonly used equipment for achieving this is the MEMS (Micro-Electro-Mechanical Systems) sensor. This sensor offers contactless sensing along one or two axes, with a 360° range of measurement possible when both axes are in play. MEMS sensors can accurately detect rotational movements, and although nominally a rotary sensor may seem like the go-to sensor for detecting rotational movements, when these occur in an environment where the rotation happens on more than one plane, i.e. on equipment such as large cranes that move both circularly and from side to side, a MEMS tilt sensor is the best option.MEMS sensors detect a change in angle and convert this into an analogue signal that feeds back to a control panel, where the signal is translated. In the case of solar panels that move with the sun an optical sensor may be used to determine the direction of the light, which in turn notifies the panel that it needs to move. A MEMS tilt sensor measures the position of the panel as it moves and ensures it stops at the right angle.MEMS technology is used in a wide range of industries and applications, from oil rigs and cranes to mobile phones it is MEMS technology that enables stargazing apps to detect the angle and direction of the phone in relation to the sky, thereby determining which view appears on the screen. Interactive computer games consoles, such as the Wii, also use MEMS to detect and then translate the player's movements onto the screen. Because MEMS, by nature, is very compact it is ideal for use in these small devices, but is equally at home in larger devices and heavy plant equipment.Positek have built on the MEMS technology, keeping the contactless aspect of the sensor, and have created a range of submersible, compact and intrinsically safe tilt sensors and inclinometers using the patented contactless technology that drives the entire range. The submersible tilt sensors can be used underwater and are therefore ideal for offshore oil rigs and other applications where water could be a problem for other styles of sensor. Even if the sensor does not need to be submerged, but is regularly exposed to moisture or rain using a waterproof sensor removes the risk of failure due to water damage.Intrinsically safe tilt sensors from Positek are manufactured for use in potentially hazardous environments, such as oil refineries, gas processing plants and any production facility where gas and combustible materials are present. They are designed to be incapable of producing a spark that could ignite anything, and so are the ideal option for reducing and removing health and safety risks associated with spontaneous fires in hazardous places. Intrinsically safe tilt sensors need to be used with a galvanically isolated amplifier to convert the electrical output and to dump excess charge in a safe area where there is no risk of fire.There are several different types to choose from, but most are operable at temperatures between -40°c and 80°c and with a measurement range of 15° to 160°, some being capable of withstanding temperatures up to 125°c. Of course, Positek are able to design and build custom sensors using the same contactless technology so if there is a larger range of measurement needed, or the sensor are going to be used in a challenging environment then we can find a solution perfect for those requirements. Article published on: 28/02/2017 Article last updated on: 28/02/2017