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> Mtl 761PAC shunt-diode safety barrier, 9V - 350 ohm
Mtl 761PAC shunt-diode safety barrier, 9V - 350 ohm
ITEM: MTL 761Pac Shunt-Diode Safety Barrier, 9V - 350 Ohm, 250 Um - 9 Uz, BASEEFA No. 92C2373, Vmax = 250V r.m.s.
CONDITION: Used, returned to plant storeroom for re-use, appear to be in excellent condition. Refund if DOA.
MANUFACTURER: Measurement Technology Limited
DESCRIPTION: For safe measurement and control in hazardous areas 1 or 2 channels in same slim package
Electronic protection prevents blown fuses
All models short-circuit proof
Stay-put tagging & cable-screen earthing
Certified to worldwide standards
MTL700 Series Shunt-Diode Safety Barriers are 1- or 2-channel devices which pass an electrical signal in either direction without shunting it, but limit the transfer of energy to a level that cannot ignite explosive atmospheres. Connected in series with the signal transmission lines on a process plant, they protect hazardous-area wiring and equipment against faults occurring in the safe area, and enable a wide range of measurement and control operations to be carried out simply and inexpensively by intrinsically safe techniques. Conventional wiring and, frequently, standard transducers can be employed in the hazardous area, and can be worked on for maintenance or calibration purposes without further precautions. Safe-area equipment needs no certification and can be modified or extended as required.
Applications include the protection of installations containing 'simple' uncertified devices such as thermocouples, switches, and resistive sensors, or separately certified 'energy storing' or 'voltage producing' apparatus, for example ac sensors, transmitters, and current-to-pneumatic (I/P) converters. All 'simple' devices can be used in areas of continuous hazard: 'energy-storing apparatus' is certified for use in a particular 'zone' or 'division'. MTL700 Series barriers give protection in all normally occurring explosive atmospheres, including all mixtures with air of flammable gases, vapours, dusts, fibres and flyings.
Essential features of the MTL700 Series are the self checking 'as-you-mount-it' earthing via two studs directly to nickel-plated brass or copper busbar. The earth connection is on top of the unit, allowing easy inspection, installation and removal. The shape of the barrier has been designed for easy wiring, while the common (14.5 mm) space requirement of both 1- and 2-channel units simplifies planning or alteration of installations of all sizes. The terminals of the barrier are angled for easy access and accept field wiring directly, making a second set of terminals unnecessary. The busbar is insulated for separate earthing, to eliminate the danger of invasion by fault currents.
The range was tailored to meet most users' needs without offering a confusing mass of options. Following the philosophy that users are busy people deserving clear solutions, we have highlighted throughout the literature the 7 'key' application-oriented barriers that meet the majority of process control requirements. These key barriers are stocked worldwide and are available from MTL distributors on immediate delivery, enabling users to reduce their inventory and making the choice and use of barriers even easier.
Overvolt protection in four models permits their use with unregulated power supplies.
For higher-power applications, a range of MTL700P barriers takes advantage of changes in interpretation of the standards.
Series MTL700 Safety Barrier webpage and technical specs.
SOURCE: Surplus to the continuing operations of a large pharmaceutical company.
SELLS ELSEWHERE FOR APPROX.: $150
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