Motherwell Tank Gauging > Products > Overfill Prevention Systems
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150 Years Of Manufacturing

Vibrating Fork Level Switch

The Vibrating Fork Level Switch (Vibrofork) can be used on almost any liquid, from LPGs to bitumens. As a fail safe level switch it can be installed in any orientation, above, below or sideways even in pipework.

Features and Benefits of Vibrating Fork level switch

Vibrating fork level switch has SIL2 conformance and carry WHG overfill certification.

  • Low maintenance, high reliability
  • Electrical safety:
    • ATEX II 1G, 1/2G, 2G EEx ia IIC T6 (tamb = -40oC to +70oC)
    • ATEX II 1/2G, 2G EEx d ia IIC T6) (tamb = -40oC to +70oC)
  • Unaffected by changing temperature, pressure, conductivity, density or viscosity
  • Works in any orientation with a tuning fork of up user-specified length
  • Small connection thread from ¾” and flanges from DN 25 (ANSI 1”)
  • Pressures up to 64bar and 250 deg C temperatures
  • High resistance materials and coatings
  • Electronics are Self monitoring for damage, corrosion or heavy build up on forks
  • “Press to test” facility without raising the level, or removing the switch
  • Compatible with MTG SILguard Overfill Prevention Systems



Vibrating

Fork

 

Datasheet

Contact our sales team for more information on our vibrating fork level switch

SILGuard Tank Overfill Prevention System

Application
  • MTG SILGuard Tank Overfill Prevention System provides a SAFETY INSTRUMENTED SYSTEM (SIS) specifically for use in BULK LIQUID AND GAS STORAGE FACILITIES
  • MTG SILGuard is available for the range of modern storage tank designs, SENSING, ANNUNCIATING and optionally AUTOMATICALLY RESPONDING to any tank nearing overfill conditions
  • MTG SILGuard  provides a STANDALONE SAFETY FUNCTION as part of or separate from your tank gauging equipment
  • MTG SILGuard is designed complete with integrated proof testing facilities – with some technologies supporting PROOF TEST IN-SERVICE
Features and Benefits 
  • Comprehensive service from RISK ANALYSIS, LOPA, SIL DETERMINATION through to DEPLOYMENT, COMMISIONING and MAINTENANCE
  • SIL COMPLIANCE is provided for the INSTALLED SYSTEM (NOT just the components parts)
  • ATEX CERTIFIED hazardous area equipment
  • A range of overfill sensing technologies including RADAR for CONTINUOUS LEVEL REPORTING and VIBRATING FORK for IN-SERVICE PROOF TEST
  • OPTIONAL DUAL SENSORS provide HI and HIHI level sensing to integrate with determined operational RESPONSE TIMES
  • Safety functions include LEVEL DETECTION,  ALARM ANNUNCATION and AUTOMATIC VALVE CLOSURE
  • Compatible with the majority of REMOTE OPERATED SHUT-OFF VALVES
 
Sensing Technologies

 
 

RADAR – Continuous level measurement with alarm trip for Hi and/or HiHi conditions. Accuracy +/-2mm, Exd or Exi. Level reading can be forwarded on to tank gauging system.
 

VIBRATING FORK – Extra High Reliability – continuous self testingwith optional IN LOOP PROOF TEST facility, Accuracy +/-1mm, Exd or Exi.
 

DISPLACEMENT FLOAT SWITCH – dual versions available, integrated padlockable self-test facility, Accuracy +/-5mm, Exd, Exi

 

Processing and Annunciation

 

 At the heart of SILGuard is a SAFETY PLC, programmed using function blocks by Certified Functional Safety Engineers.
For the safety functions, annunciation is made to external and internal BEACONS and SOUNDERS (often in redundant pairs) and tank ingress shut-off is achieved by direct action to failsafe SIL incorporated VALVE/ACTUATOR combinations.
Other options include full colour TOUCH SCREENS for continuous graphical display of tank status, or MIMIC PANELS where the tank alarm display can be incorporated into the safety function.
 
Competence     SILGuard is provisioned with competence. We will support you throughout the safety lifecycle process and help to establish and justify your case and assist with the interface to governing bodes such as the HSE.
We offer

  • Complete SAFETY LIFECYCLE MANAGEMENT and DOCUMENTATION is provided by Certified Functional Safety Engineers
  • HAZARDOUS AREA equipment selection, installation and maintenance by COMPEX Certified Engineers
 
Typical Safety Loops
Example Safety Function 1 : Tank Level sensing by radar gauge, closing remote Operated Shut Off Valve on overfill tripExample Safety Function 2 : Tank overfill sensing by vibrating fork switch, advising alarms condition via dual klaxons
 
 
Download a datasheet for SILGuard here …
http://www.motherwelltankgauging.co.uk/wp-content/plugins/downloads-manager/img/icons/pdf.gif Download: MTG SILGuard Tank Overfill Prevention System (490.14KB)
Description: Datsheet describing the key benefits and main components of the MTG SILGuard Tank Overfill Prevention System.
Added: 16/09/2011, Downloads: 102

Radar Level Switch

mPuls radar gauges provide level measurement to an accuracy of +/-3mm and carry functional safety certification to SIL2. With mPuls the same transmitter can be used for high or low level switching and tank gauging or continuous level measurement.

  • Level Accuracy ± 3mm
  • Level Measuring Range 0-30 Metres
  • Suitable for use with the range of modern storage tank designs
  • Optional tank top or remote graphical display.
  • Electrical Safety
    • ATEX II 1G, 1/2G, 2G EEx ia IIC T6;
    • ATEX II 1G, 1/2G, 2G EEx ia IIC T5+
    • ATEX II 1/2D IP6X T6 (tamb = -40oC to +80oC)
    • ATEX II 1/2G, 2G EExd ia IIC T6 (tamb = -40oCto +80oC)
  • 2-wire Fieldbus
  • Compatible with MTG SILguard Overfill Prevention Systems



Datasheet

Displacement Float Operated Level Switch

Checkable and Checkable / Lockable Level Switches

A range of float-type level switches with options for explosion-proof certification, checking facilities and locking facilities.

Features

  • Weatherproof to IP 65
  • High reliability in single, dual or multi-level switching
  • All wetted parts in 316 stainless steel
  • Available in top, bottom or side mounted modes
  • Compatible with MTG SILguard Overfill Prevention Systems

Options

  • ATEX certified to II 2 G / EEx d IIC T6-T3
  • Checkable (with test lever)
  • Padlockable (security feature to prevent tampering)

Note : the checking facility on the checkable veriosn of these switches simulates the rising liquid level action by raising the float.



Weatherproof Float Switches



Explosion Proof Float Switches



Explosionproof Checkable Float Switches

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