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Dwyer Zener Barrier Models MTL7706/7787



SKU: MTL
RETAIL: 367
BASE PRICE: Call

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Description

 

Series MTL7706/7787 Zener Barrier

Intrinsically Safe Barriers for Hazardous Locations

0.50% Full Span Accuracy, 4-20 Ma Signal

 

 

The 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.

Compatible Models: 637, 638, 639, 608, 2200

 

 

FEATURES:

  • Transmitter Voltage: 16.2 V at 20 ma with 250Ω Load

  • Safe Area Output: 4 to 20 ma

  • Load Resistance 0 to 500Ω

  • Power Requirements: 20 to 35 VDC w.r.t. earth.

  • Temperature Limits: -4 to 140°F

  • LED Indication: Green: Power Indication

  • Safety Description: 28 μ V, 300Ω. 93 ma

 

 

Compatible Models: 637, 638, 639, 608, 2200

MTL Zener Barrier

Approval

Dwyer Series

MTL7706

FM for Class I, II, II; Div. 1 Groups C, D, F, G

638

MTL7706

UL for Class I, II, III; Div. 1 & 2 Groups C, D, E, F, G

639

MTL7706

FM for Class I, II, III; Div. 1 Groups B, C, D, E, F, G

637

MTL7706

FM for Class I, II, III; Div. 1 Groups A, B, C, D, E, F, G

608

MTL7787

FM for Class I, II, III; Div. 1 Groups A, B, C, D, E, F, G

2200

MTL7706

FM

Group μF mH
A & B 0.083 4.2

BASEEFA (ATEX0)

Group μF mH
IIC 0.083 4.2

MTL7787

FM

Group μF mH
A & B 0.083 4.2

BASEEFA (ATEX0)

Group μF mH
IIC 0.083 4.2
Region (Authority) Standard Approved For Certificate/file no.

USA (FM)

3600, 3610 entity 3611, 3810

AIS/I,II,III/1/Entity ABCDEFG-SCI-942; NI/I/@/ABCD/T4 [I/0] AEx[ia]IIC-SCI-942 Entity; NI/1/2/IIC/T4; Ta=140°F (60°C)

3010737

Canada (CSA)

CAN/CSA E60070, UL698, UL913, UL1604, IEC60079, C22.2

Class I, Div.2, Gps A, B, C, D; Ex nA [iA] IIC T4 Class I, Xone 2, Aex nA IIC T4

1345550

UK (BASEEFA)

EN 50014, EN 50020

EEx ia IIC

BAS01ATEX7217

UK (BASEEFA) Systems

EN 50039

EEx ia IIC

Ex01E2219

 

A Little Bit About Using Zener Barriers and Galvanic Isolators

The MTL5041/5045 Galvanic Isolators provide total intrinsically safe isolation for communication with Dwyer® pressure transmitters approved for location in hazardous areas. Galvanic isolation eliminates the need for a high integrity earth ground required when using shunt diode type safety barriers. DIN rail mounting and plug-in signal and power connectors simplify installation and maintenance.

Compatible Models: 637, 638, 639, 608, 2200, 2900

 

The 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. Requires high integrity earth ground

Compatible Models: 637, 638, 639, 608, 2200

 

What is a Good ground resistance value?

There is a good deal of confusion as to what constitutes a good ground and what the ground resistance value needs to be. Ideally a ground should be of zero ohms resistance.

There is not one standard ground resistance threshold that is recognized by all agencies. However, the NFPA and IEEE have recommended a ground resistance value of 5.0 ohms or less.

 The NEC has stated to Make sure that system impedance to ground is less than 25 ohms specified in NEC 250.56. In facilities with sensitive equipment it should be 5.0 ohms or less.

The goal in ground resistance is to achieve the lowest ground resistance value possible that makes sense economically and physically.

 

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