Floating Roof Detection
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Catalog excerpts

Floating Roof Detection - 1

Magnetrol's displacement type level switches offer the industrial user a wide choice of alarm and control configurations. Each unit utilizes a simple buoyancy principle and is well suited for simple or complex applications, such as foaming or surging liquids or agitated fluids, and usually costs less than other types of level switches. Liquid Displacer Level Switches Displacer level switches for single or multiple pump control / level alarm • Narrow or wide level ranges achieved through multiple switch mechanism capability • Maximum process temperature: +260 °C (500 °F). • Maximum process pressure: 55,1 bar (800 psi). • Displacers adjustable at any point along the suspension cable. • Anti-surge design eliminates the possibility of switch short cycling. • Standard 3 m (10 ft) of suspension cable, included for all models. • Field adjustable set point and switch differential. • Wide choice of displacer materials. • Wide choice of housings and switch mechanisms • Standard anti-corrosive protection. • Optional: - NACE construction (MR-01-75) - Proof-er® ground check - Floating roof models - High pressure models - Models for interface. • Suited for SIL 2 loops (DPDT switch) (full FMEDA report available). Foaming or surging liquids Agitated uids Sewage handling Dirty liquids Paints Varnishes Heavy oils Liquids with solids II 2G Ex d IIC T6 Gb, ameproof enclosure II 1G EEx ia IIC T6, intrinsically safe explosion proof and intrinsically safe Class I, Div. 1, Groups C & D Class II, Div. 1, Groups E, F & G, Type NEMA 7/9 Non-Hazardous area Explosion proof area – Groups B, C, D, E, F & G Type NEMA 4X/7/9 Ex d IIC T6 Lloyds Register of Shipping (marine applications) Russian Authorisation Standards Other approvals are available, consult factory for more details For CCE approved units, use the ATEX model numbers. Consult factory for proper model numbers

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Floating Roof Detection - 2

Standard controls Operation is based upon simple buoyancy, whereby a spring is loaded with weighted displacers which are heavier than the liquid. Immersion of the displacers in the liquid results in buoyancy force change, which moves the spring upward. Since the spring moves only when the level moves on a displacer, spring movement (1) is always a small fraction of the level travel between displacers (2). A magnetic sleeve (3) is connected to the spring and operates within a non-magnetic barrier tube (4). Spring movement causes the magnetic sleeve to attract a pivoted magnet (5), actuating...

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Floating Roof Detection - 3

AVA I L A B L E S W I T C H M E C H A N I S M S Type of switch module Micro switch Micro switch with gold alloy contacts Micro switch Micro switch - DC current Hermetically sealed micro switch Hermetically sealed micro switch with silver plated contacts Hermetically sealed micro switch with gold plated contacts Proximity switch - type SJ 3.5 SN Pneumatic non bleed type (closed circuit) Hermetically sealed micro switch Hermetically sealed micro switch For applications with heavy vibration, consult factory for suited switch modules. Max process temperature is specied at 40 °C (100 °F) ambient...

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Floating Roof Detection - 4

SINGLE SWITCH MODELS Models A15 – Level alarm applications Narrow differential type These instruments are factory calibrated to operate over a narrow level differential band and are ideally suited for liquid level alarm applications, on either high or low level. The operating level is fully adjustable by simply repositioning the displacer along its suspension cable. The differential band is ± 51 mm (2") in water and varies with liquid specific gravity. Models A10 – Pump or valve control Wide differential type These wide differential units are factory calibrated to actuate as a liquid level...

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Floating Roof Detection - 5

Model B10 units are available factory calibrated with a choice of switch operating sequence. Five of the most popular sequences are described below. When ordering B10 units, an operating sequence and specific gravity MUST be provided. PUMP CONTROL PLUS ALARM Arrangement N° 1 — fill with high level alarm At the lowest level the pump starts. When the level rises to the middle displacer, the pump stops. If the level continues to rise, the upper displacer actuates the alarm switch which remains actuated until the level drops to the middle displacer. CONTROL OF 2 PUMPS Arrangement N° 4 In this...

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Floating Roof Detection - 6

TRIPLE SWITCH MODELS Models C10 Wide differential type These wide differential type switches are designed to provide three electrically separate control signals in sequence as liquid level varies. These units are factory calibrated with a choice of several sequences. Models C15 Narrow differential type These instruments are factory calibrated to operate over a narrow level band while providing three electrically separate control signals in sequence as liquid level varies.

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Floating Roof Detection - 7

Model C10 units are available factory calibrated with a choice of switch operating sequence. Seven of the most popular sequences are described below. Upper switch wide diff. adjustable Upper switch wide diff. adjustable Middle switch wide diff. adjustable Middle switch wide diff. adjustable Lower switch wide diff. adjustable Lower switch wide diff. adjustable Middle switch wide diff. adjustable Lower switch wide diff. adj. Lower switch narrow diff. fixed Upper switch narrow diff. fixed Upper switch wide diff. adjustable Middle switch wide diff. adjustable Middle switch wide diff. adjustable...

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Floating Roof Detection - 8

Narrow Differential: for actuation of an alarm or system shutdown - up to 3 setpoints. Wide Differential: switch differential for valve or pump control - up to 3 pump control functions. Single switch models Dual switch models Triple switch models Three Alarms Single switch models Dual switch models Two pump controls or one alarm + one pump control Narrow Differential Wide Differential Three pump controls or one alarm + two pump controls or two alarms + 1 pump control Triple switch models Specic gravity limits – not for oating roof models. P.N. Liquid temp. code °C °F A10 Specic gravity -...

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