Dwyer MTL7787 Zener Barrier

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Dwyer MTL7787 Zener Barrier Specification

Sensor Type
Zener Barrier

Thread
DIN mounting rail

Outer Size
114 mm x 12.5 mm x 110 mm

Grade
Industrial

Material
Aluminum enclosure, electronic components

Processing Type
Explosion Proof Barrier

Mount Type
DIN Rail Mount

Accuracy
Dependent on the control system

Finishing
Epoxy-coated finish

Accessories
Instruction manual, mounting hardware

Dwyer MTL7787 Zener Barrier Trade Information

Minimum Order Quantity
1 Piece

Payment Terms
Cash Against Delivery (CAD), Cash on Delivery (COD), Cheque, Letter of Credit (L/C), Western Union, Paypal, Letter of Credit at Sight (Sight L/C), Telegraphic Transfer (T/T), Delivery Point (DP), Days after Acceptance (DA), Cash in Advance (CID), Cash Advance (CA)

Sample Policy
Sample costs shipping and taxes has to be paid by the buyer

Main Export Market(s)
Australia, North America, South America, Eastern Europe, Western Europe, Middle East, Central America, Africa, Asia

Main Domestic Market
All India

About Dwyer MTL7787 Zener Barrier

Dwyer MTL7787 Zener Barrier

OVERVIEW
Features

Transmitter Voltage: 16.2 V @ 20 mA with 250 load (negative w.r.t. earth); 11.0 V @ 20 mA with 500 load (negative w.r.t. earth)
Safe Area Output: 4 to 20 mA
Load Resistance: 0 to 500.
Accuracy: 2 A under all conditions
LED Indicator
Safety Description: 28 V, 300, 93 mA
Weight: 4.9 oz (140 g).
Agency Approvals: See table on Catalog page.

Model	Description
MTL7706	Intrinsically Safe Zener Barrier.
MTL7787	Intrinsically Safe Zener Barrier.

DESCRIPTION

The Dwyer MTL7706/7787 is an intrinsically safe (IS) shunt-diode barrier that can be used to communicate with and provide isolations for certain Dwyer Transmitters Approved for use in hazardous areas. These Barriers Limit the amount of energy allowed to pass into the hazardous area, which inhibit ignition in flammable atmospheres.

Product Applications

Electrically Isolates Pressure and Level Transmitters From Unregulated Circuits For Intrinsically Safe Applications

Model Description

MTL7706 Intrinsically Safe Zener Barrier.

MTL7787 Intrinsically Safe Zener Barrier.

Reliable Intrinsic Safety with Dual Channel Design

The MTL7787+ Zener Barrier offers superior protection for both signal and power loops used in hazardous areas, thanks to its dual-channel, polarized configuration. This allows for safe operation of plant instrumentation, minimizing risk and downtime, especially in industrial settings subject to explosions or safety regulations.

Compact and Durable Construction for Industrial Use

Built with a rugged aluminum enclosure and protected by an epoxy-coated finish, the MTL7787+ is designed for long service life. Its slim form factor and compatibility with 35 mm DIN rails make installation straightforward, even in control panels where space is limited.

FAQs of Dwyer MTL7787 Zener Barrier:

Q: How does the MTL7787+ Zener Barrier provide intrinsic safety in hazardous environments?

A: The MTL7787+ Zener Barrier limits the voltage and current delivered to circuits in hazardous areas, preventing sparks and excessive energy that could ignite flammable atmospheres. Its dual-channel design allows both signal and power to be safely transferred while adhering to intrinsic safety standards.

Q: What are the typical usage scenarios for this zener barrier?

A: This zener barrier is typically used to protect electrical signals and power lines in areas classified as hazardous, such as chemical plants, oil refineries, or gas processing facilities. It enables safe connection of field instruments with control systems, ensuring compliance with explosion-proof requirements.

Q: Where should the MTL7787+ be installed for optimal performance?

A: For best performance, the MTL7787+ should be mounted on a 35 mm DIN rail within a control panel located at the boundary of the safe and hazardous area. Ensure proper earthing and follow the instructions provided in the included manual for safe and effective installation.

Q: What is the process for mounting and connecting this zener barrier?

A: Mounting is accomplished by snapping the device onto a standard 35 mm DIN rail. Electrical connections are made to the clearly marked terminals. Mounting hardware and an instruction manual are provided, and it is important to connect the earth terminal to a reliable ground to maintain intrinsic safety.

Q: When should a zener barrier like the MTL7787+ be selected over other types of barriers?

A: Select a zener barrier when intrinsically safe circuits are required in hazardous zones and a simple, cost-effective protective solution is preferred. It is ideal for applications where low current and voltage limits comply with site requirements and the process environment demands explosion-proof safeguards.

Q: What are the main benefits of using the Dwyer MTL7787+ Zener Barrier?

A: Key benefits include enhanced personnel safety and equipment protection in hazardous areas, reliable dual-channel operation, easy DIN rail mounting, compact design, robust build quality, and compliance with industry safety standards. These features help facilitate safer process automation and control.

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