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6 .7 .6
MTL5582/MTL5582B - Resistance Isolator
Single channel, to repeat RTD signals
The MTL5582 or MTL5582B connect to a 2-, 3-, or 4-wire resistance temperature device (RTD)
or other resistance located in a hazardous area, isolates it and repeats the resistance to a
monitoring system in the safe area. The module is intended typically (but not exclusively) for
use with Pt100 3-wire RTDs. Switches enable selection of 2-, 3-, or 4-wire RTD connection.
The MTL5582/ MTL5582B should be considered as an alternative, non-configurable MTL5575,
for use in RTD applications where a resistance input is preferred or needed instead of 4/20mA.
The design is notable for its ease of use and repeatability. The number of wires which can
be connected on the safe-area side of the unit is independent of the number of wires which
can be connected on the hazardous-area side. The module drives upscale in the case of open
circuit detection. The MTL5582B replaced the MTL5582 during 2016 to improve the response
characteristics of the safe area circuit.
MTL5582
PWR
Figure 6 .32:
Top label
for MTL5582/
MTL5582B
Warning: Check polarity of terminals used for safe-area connections. Safe-area terminals
9, 10, 11 and 12 are unipolar so it is essential to select a positive terminal on the MTL5582/
MTL5582B for connection to the positive of the RTD input card.
RTD type selection switches
INM 5500 Rev 10
Hazardous area
Safe area
6
4-wire
5
4
3-wire
+
3
2-wire
2
–
1
Terminal
Function
RTD input –ve
1
3
RTD input +ve
4
3-wire RTD input –ve
5
4-wire RTD input +ve
9
RTD output –ve
10
RTD output +ve
11
RTD output –ve
12
RTD output +ve
13
Supply –ve
14
Supply +ve
Sw 1
2-wire
3-wire
4-wire
7
8
–
9
W
+
10
–
W
11
12
+
13
14
20 to 35V dc
OFF position
ON position
Sw 2
Sw 1
Sw 2
OFF
ON
ON
ON
ON
OFF
Vs–
Vs+
55
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