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Series
MTL5041/5045 Galvanic Isolator
Intrinsically Isolators for Hazardous Locations
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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 |
FEATURES:
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Transmitter
Voltage: 16.5 V at 20 ma
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Safe Area Output:
4 to 20 ma
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Hazardous Area
Input: 0 to 24 ma (including over-range)
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Load Resistance
0 to 1KΩ
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Power Requirements:
20 to 35 VDC w.r.t. earth.
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Temperature Limits:
-4 to 140°F
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LED Indication:
Green: Power Indication
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Safety Description:
28 μ V, 300Ω. 93 ma
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Compatible Models: 637, 638, 639, 608,
2200, 2900 |
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Galvanic
Isolator |
Approval |
Dwyer Series |
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MTL5041 |
FM for Class I, II, II; Div. 1 Groups C, D, F, G
|
638 |
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MTL5041 |
UL for Class I, II, III; Div. 1 & 2 Groups C, D, E,
F, G |
639 |
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MTL5041 |
FM for Class I, II, III; Div. 1 Groups B, C, D, E,
F, G |
637 |
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MTL5041 |
FM for Class I, II, III; Div. 1 Groups B, C, D, E,
F, G |
608 |
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MTL5045 |
FM for Class I, II, III; Div. 1 Groups A, B, C, D,
E, F, G |
2200 |
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MTL5045 |
FM for Class I, II, III; Div. 1 Groups A, B, C, D,
E, F, G |
2900 |
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MTL5041 and
MTL5045 |
FM |
| Group |
μF |
mH |
| A & B |
0.13 |
4.2 |
| C |
0.30 |
12.6 |
| D |
1.04 |
33.6 |
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BASEEFA (ATEX0) |
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Group |
μF |
mH |
μH/Ω |
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IIC |
0.083 |
3.05 |
55 |
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IIB |
0.85 |
9.15 |
210 |
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IIA |
2.15 |
24.4 |
444 |
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Region (Authority)
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Standard |
Approved For |
Certificate/file no.
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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)
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3010737 |
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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 |
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UK (BASEEFA) |
EN 50014, EN 50020 |
EEx ia IIC |
BAS01ATEX7217 |
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UK (BASEEFA) Systems |
EN 50039 |
EEx ia IIC |
Ex01E2219 |
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A Little Bit About Using Zener Barriers and Galvanic
Isolators |
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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
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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
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What is a Good ground resistance value? |
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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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