INM 5500 Rev 11
52
6.7.2 MTL5575 - Temperature Converter
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.
Top label
Use the following LED information to understand the module status.
Status PWR (green) STS(yellow)
Power ON ON
Insufficient voltage or Power OFF OFF
Normal working ON
Device failure FLASH
Sensor failure/Error FLASH
Output relay ON (Trip) ON ON
Output relay OFF (Trip) ON OFF
Early burnout detection (EBD) FAST FLASH
Hazardous area
Safe
are
a
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
Figure 6.28:
Top label
for MTL5575
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