Some installations will require ATEX (or similar) compliant equipment. Titan Enterprises’ Oval gear flowmeters can be fitted with either the Namur sensor or the reed switch (simple apparatus) for use in hazardous areas.
A fully-certified NAMUR Proximity Switch is an intrinsically safe sensor specially designed for use in hazardous locations that have explosive gas, dust or fibres present. For example, a Namur switch integral to the flowmeter and supplied with an appropriate amplifier can comply with ATEX requirements, enabling the flowmeter to deliver highly accurate flow measurement in such an environment. In addition, the electronics of the flow device would ideally be isolated in safe housing or safe zone.
The NAMUR sensor is a two-wire device that operates with a constant voltage supply, characteristically 8Vdc. As the flow though the meter varies, the resistance of the NAMUR sensor changes. Typically, the current trigger points are <1.2mA to >2.1mA as the target passes the sensor. These devices are commonly employed with specialist flow meters in hazardous areas due to the sensor’s very low power consumption and the ease of remotely monitoring any resistance/current changes. Converters to standard outputs are available for compatibility.
NAMUR sensors are used in process industries such as chemical plants, oil and gas refineries, and pharmaceutical manufacturing, where intrinsic safety and reliable signals are critical requirements.
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