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6 .7 .2
Single channel, THC or RTD input with alarm
The MTL5575 converts a low-level dc signal from a temperature sensor mounted in a
hazardous area into a 4/20mA current for driving a safe-area load. Software selectable features
include linearisation, ranging, monitoring, testing and tagging for all thermocouple types and 2,
3 or
4-wire RTDs. (For thermocouple applications the HAZ-CJC plug, on terminals 1–3, includes an
integral CJC sensor). Configuration is carried out using a personal computer - see section 6.9. A
single alarm output is provided and may be configured for process alarm or to provide notice of
early thermocouple failure.
STS
CONFIG
MTL5575
PWR
Figure 6 .28:
Top label
for MTL5575
Top label
Use the following LED information to understand the module status.
Status
Power ON
Insufficient voltage or Power OFF
Normal working
Device failure
Sensor failure/Error
Output relay ON (Trip)
Output relay OFF (Trip)
Early burnout detection (EBD)
52
MTL5575 - Temperature Converter
Hazardous area
Safe area
4-wire
3-wire
+
mV
–
Terminal
Function
1
THC/EMF/RTD input –ve
3
THC/EMF/RTD input +ve
4
3-wire RTD input –ve
5
4-wire RTD input +ve
8
Alarm relay
9
Alarm relay
11
Output –ve
12
Output +ve
13
Supply –ve
14
Supply +ve
Configuration
socket
6
7
5
8
4
9
mV
10
3
–
11
I
2
4/20mA
12
1
+
13
14
20 to 35V dc
PWR (green)
STS(yellow)
ON
OFF
ON
FLASH
FLASH
ON
ON
FAST FLASH
Alarm
Load
Vs–
Vs+
ON
OFF
INM 5500 Rev 11
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