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A
SAFE AREA
SERIES MTL7706/7787
ZENER BARRIERS
Intrinsically Safe Barriers for Hazardous Locations
PROCESS CONTROL
MTL7787
The Series MTL7706/7787 Zener Barriers are an intrinsically safe 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 ammable
atmospheres.
BENEFITS/FEATURES
• Approved for use in hazardous areas
APPLICATIONS
• Electrically isolates pressure and level transmitters from unregulated circuits for
intrinsically safe applications
HAZARDOUS
REA TERMINALS
4-5/32
[105.57]
SPECIFICATIONS
®
Transmitter Voltage: 16.2 V at 20 mA with 250 Ω load (negative w.r.t. earth); 11.0
V at 20 mA with 500 Ω load (negative w.r.t. earth).
Safe Area Output: 4-20 mA.
Load Resistance: 0 to 500 Ω.
Power Requirement: 20-35 VDC w.r.t. earth.
Accuracy: ±2 µA under all conditions.
LED Indicator: Green: Power indication.
Temperature Limits: Operating: -4 to 140°F (-20 to 60°C); Storage: -40 to 176°F
(-40 to 80°C).
Humidity: 5 to 95% RH.
Terminals: Accommodate up to 2.5 mm
Safety Description: 28 µV, 300 Ω, 93 mA.
Weight: 4.9 oz (140 g).
Compliance: See table.
2
stranded or single-core.
TERMINAL
1/2
[12.70]
3-35/64
[90.09]
Intrinsically Safe Barriers
COMPATIBLE MODELS: 637, 608, SBLTX, PBLTX, IS626
Model Approval
MTL7706
MTL7706
MTL7706
Note: Compatible models: 637, 608, SBLTX, PBLTX, IS626.
MODEL CHART
Model
MTL7706
MTL7787
Region (Authority) Standard Approved For Certicate/File no.
USA (FM) (UL)
Canada (CSA)
UK (BASEEFA)
UK (BASEEFA) Systems
UL for class I; div. 1 groups A, B, C, D
CL II; div. 1 groups E, F, G; CL III div. 1
FM for class I, II, III; div. 1 groups B, C, D, E, F, G
FM for class I, II, III; div. 1 groups A, B, C, D, E, F, G
FM BASEEFA (ATEX)
Group µF mH Group µF mH
A & B
0.083
4.2
IIC
0.083
4.2
A & B
0.083
IIC
3.05
3600,
3610 entity
3611, 3810
UL698,
UL913
UL1604
CAN/CSA
E60070,
IEC60079,
C22.2
EN 50014,
EN 50020
EN 50039
0.083
3.05
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)
Class I, Div.2, Gps A, B, C, D;
Ex nA [iA] IIC T4
Class I, Xone 2, Aex nA IIC
T4
EEx ia IIC
EEx ia IIC
Dwyer
Series
IS626, SBLTX,
PBLTX
637
608
3010737
1345550
BAS01ATEX7217
Ex01E2219
MODEL CHART
Model Description
MTL7706
MTL7787
ACCESSORIES
Model Description
A-360 Aluminum DIN rail 1 m
Zener barrier
Zener barrier
DWYER INSTRUMENTS, LLC | dwyer-inst.com
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