BM 500
16Pages

Catalog excerpts

Technical Datasheet Potentiometric Level Transmitter for hygienic liquid applications • Compact, food compatible, hygienic design • Unaffected by adhesive media • Configurable measuring range

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1.1 Level meter for hygienic applications The level meter BM 500 utilises the potentiometric measuring principle and can be used in all media that have a minimum conductivity of 50 μS/cm. The device is ideal for measurements in small vessels with tough, pasty or strong adhesive media, such as ketchup, honey, and toothpaste. The integrated electronics provide a 4...20 mA output. The device has automatic recognition of top/bottom mounting position. Even angled installation is possible. A version with remote electronics is available for applications where the ambient temperature at the...

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1.2 Options and variants LED level monitor The level meter can be mounted from the top or the bottom of the tank. Delivered from the factory, the 4 mA output corresponds to the tip of the rod, the 20 mA value to the end of the cylindrical part of the rod. Measuring range of the customer can be calibrated by pressing one of the two set points keys for more than 3 seconds. The relevant LED will show a steady light. With these two buttons any empty/ full level can be configured on the entire length of the rod. Factory setting will be valid again by pressing both keys for more than 3 seconds....

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Uout to amplifier Ugen Medium Tube Tank The liquid is stored in a tank, connected to ground. The immersed measuring rod is a low resistance rod where the ends are powered by an AC generator operating in the lower kilohertz frequency range. Between the rod and the tank wall is an endless amount of high level resistances. Since they connect to the same potential (the tank wall) they can be shown as two equivalent resistances, R1 and R2 connected to an imaginary center point. A high resistance input amplifier is connected between the generator and the tank wall. Since the generator is...

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2.1 Technical data • The following data is provided for general applications. If you require data that is more relevant to your specific application, please contact us or your local sales office. • Additional information (certificates, special tools, software,...) and complete product documentation can be downloaded free of charge from the website (Downloadcenter). Measuring system Measuring principle Application range Level detection of all media with the minimum conductivity of 50 µS/cm in tanks. Design Options Remote version for applications with ambient temperature above +60°C / +140°F...

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Materials Probe Stainless steel 1.4404 / AISI 316 L Stainless steel 1.4301 / AISI 304 Process connection Stainless steel 1.4404 / AISI 316 L Sensor insulation Electrical connection M16 cable glands: Plastic M12 plug: Nickel-plated brass Process connections Standard For other hygienic process connections, e.g. Tri-Clamp®, DIN 11851, VARIVENT® – refer to the "Order information" chapter. Electrical connections Power supply Resolution, input Status signal, "full" Response time Cable entry M16 cable glands, M12 plug This device fulfils the statutory requirements of the EC directives. The...

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Figure 2-1: Dimensions of compact (left) and remote (right) version 1 2 3 4 5 6 M12×1 plug M16×1.5 cable gland WS 36 G1 Active zone Connecting cable (please specify length on ordering (min.: 1 m / 3.3 ft; max.: 5 m / 16.4 ft))

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3.1 Intended use Responsibility for the use of the measuring devices with regard to suitability, intended use and corrosion resistance of the used materials against the measured fluid lies solely with the operator. The manufacturer is not liable for any damage resulting from improper use or use for other than the intended purpose. The potentiometric level meter BM 500 is designed solely for measuring continuously the level of liquids and pasty and sticky products. The device is particularly suitable for measuring low levels in the range of 50...1000 mm / 2...39.4". Thanks to the principle...

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3.3 Installation requirements • Be sure that the measuring rod has the correct depth of immersion when placing your order. The sensor cannot be shortened subsequently! • Use only the recommended sleeves or adapters. If other systems are used, no guarantee can be given for proper functioning or leak-tightness. • The connection thread must have electrical contact with the metal vessel. If this is not possible, use a separate grounding cable to meet this condition. • Do not use Teflon or paper gaskets. • The tightening torque for the sleeve should be 20...30 Nm. • If the vessel is electrically...

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Please be aware of the active measuring zone of the rod (refer to the following drawing). The BM 500 tracks level outside its normal 4...20 mA measuring range; up to 21.6 mA and down to 2.4 mA. • Above 21.6 mA, the unit will freeze output at 21.6 mA. • Below 2.4 mA level, the unit will freeze output to 2.4 mA. 3.4 Process connection The hygienic 1" process sleeve is easy to weld into tanks or pipes. This kind of assembly allows installation in conformity with standards of hygiene such as FDA. The G1 connections can be mounted in any counter thread acc. to ISO 228. Various hygienic adapter...

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3.5 Mounting of 3A marked products The 3A mark is valid only when the product is mounted in a 3A marked counterpart and installed acc. to the installation manual. Use also a 3A marked O-ring or gasket if relevant. The 3A marked products conform to the 3A sanitary standards criteria. Materials and surfaces fulfill the FDA demands. EPDM O-rings supplied with 3A marked products are conform to sanitary standards class II (8% milk fat). 1 Use only 3A approved counterparts. 2 The inspection hole should be visible and drained. Face it downwards so that possible leaking can be observed. 3 Mount the...

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4.1 Safety instructions All work on the electrical connections may only be carried out with the power disconnected. Take note of the voltage data on the nameplate! Observe the national regulations for electrical installations! For devices used in hazardous areas, additional safety notes apply; please refer to the Ex documentation. Observe without fail the local occupational health and safety regulations. Any work done on the electrical components of the measuring device may only be carried out by properly trained specialists. Look at the device nameplate to ensure that the device is...

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