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6 .7 .3
Two channel, RTD/potentiometer input
The MTL5576-RTD converts signals from resistance temperature detectors (RTDs) mounted
in a hazardous area, into 4/20mA currents for driving safe-area loads. The MTL5576-RTD is
compatible with 2- and 3-wire RTD inputs.
Performance features, including input type and characterisation, ranging, monitoring, testing
and tagging are selected using PCS45 software, which is loaded onto a personal computer and
connected via the PCL45USB serial link - see Section 6.9.
CH1
CH2
CONFIG
MTL5576
FLT
FLT
PWR
Figure 6 .29:
Top label
for MTL5576
Top label
Use the following LED information to understand the module status.
Status
Power ON
Insufficient voltage or Power OFF
Communication in progress
Normal working
Device failure
Channel 1 - Sensor failure/Error
Channel 2 - Sensor failure/Error
Default configuration for both channels is as shown in 6.7 except S/C alarm set OFF .
53
MTL5576-RTD - Temperature Converter
Hazardous area
3-wire
Ch2
3-wire
Ch1
Terminal
Function
RTD input (Ch1)
1
2
RTD input (Ch1)
3
3–wire RTD input (Ch1)
4
RTD input (Ch2)
5
RTD input (Ch2)
6
3–wire RTD input (Ch2)
8
Output –ve (Ch2)
9
Output +ve (Ch2)
11
Output –ve (Ch1)
12
Output +ve (Ch1)
13
Supply –ve
14
Supply +ve
Safe area
Configuration
socket
6
7
–
5
8
W
4/20mA
4
9
+
I
10
3
–
11
I
2
4/20mA
12
1
+
13
14
20 to 35V dc
PWR (green)
FLT (red)
ON
OFF
FLASH
ON
ON
ON
FLASH
ON
FLASH
Load
Ch2
Load
Ch1
Vs–
Vs+
STS(yellow)
OFF
OFF
ON
OFF
ON
INM 5500 Rev 11
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