MTL4675 temperature convert

MTL4675 temperature convert

The MTL4675 converts a low-level dc signal from a temperature sensor mounted into a 4/20mA current for driving a 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 SAF-CJC plug on terminals 1–3 includes an integral CJC sensor). Configuration is carried out using a personal computer. A single alarm output is provided and may be configured for high or low process alarm or to provide notice of early thermocouple failure.

RTD excitation current:200µA nominal

Cold junction compensation:Automatic or selectable

Cold junction compensation error:≤ 1.0°C

Common mode rejection:120dB for 240V at 50Hz or 60Hz (500ms response)

Series mode rejection:40dB for 50Hz or 60Hz

Output range:4 to 20mA nominal into 600Ω max. (direct or reverse)

Alarm output (configurable):Relay ON in alarm, 250mA @ 35V max

Maximum lead resistance (THC):600Ω

Response time:Configurable - 500 ms default

(Accuracy at 100/200ms - contact MTL):LED indicator

Green: power and status indication:Yellow: alarm indication, on when contacts are closed

Maximum current consumption (with 20mA signal):50mA at 24V

Power dissipation within unit (with 20mA signal):1.2W at 24V

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