MTL5573 TEMPERATURE CONVERTER THC or RTD input

MTL5573 TEMPERATURE CONVERTER THC or RTD input

The MTLx573 converts a low-level dc signal from a temperature sensor mounted in a hazardous area into a 4/20mA current for driving a safearea 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

MTL5573 TEMPERATURE CONVERTER THC or RTD input

SPECIFICATION
See also common specification

Number of channels
   One
Location of signal source
   Zone 0, IIC, Hazardous area
   Division 1, Groups A-D, hazardous location
RTD excitation current
   200µA nominal
Cold junction compensation, THC input
   Selectable ON or OFF
Cold junction compensation error
   ≤ 1.0°C
Common mode rejection
   120dB for 240V at 50Hz or 60Hz

MTL5573 TEMPERATURE CONVERTER THC or RTD input
Series mode rejection
   40dB for 50Hz or 60Hz
Calibration accuracy (at 20°C)
(includes hysteresis, non-linearity and repeatability)
Inputs:
   mV/THC: ± 15µV or ± 0.05% of input value
           (whichever is greater)
   Pt 100 - RTD: ± 80mΩ
Output: ± 11µA
Temperature drift (typical)
Inputs:
    mV/THC: ± 0.003% of input value/°C
    Pt 100 - RTD: ± 7mΩ/°C
Output: ± 0.6µA/°C
Example of calibration accuracy and temperature drift
(RTD input)
   Span: 250Ω
   Accuracy: ± (0.08/250 + 11/16000) x 100%
                = 0.1% of span
Temperature drift: ± (0.007/250 x 16000 + 0.6) µA/°C
                        = ±1.0µA/°C
MTL5573 TEMPERATURE CONVERTER THC or RTD input
Safety drive on sensor failure
   Upscale, downscale, or off
Early burnout
   Early burnout detection for thermocouples (when selected)
   EBD indicated when loop resistance increase is > 50Ω
Output range
   4 to 20mA nominal into 600Ω max.
   Out of range characteristic - MTL or NAMUR NE43
Maximum lead resistance (THC)
  600Ω
Response time
  Typical 500 ms
LED indicator
  Green: EBD alarm indication, power and status indication
  Yellow: alarm indication
Maximum current consumption (with 20mA signal)
  50mA at 24V
Power dissipation within unit (with 20mA signal)
  1.2W at 24V
Safety description
  Refer to certificate for parameters. Um=253V rms or dc
Configurator
  A personal computer running MTL PCS45 software with a
  PCL45USB serial interface.
MTL5573 TEMPERATURE CONVERTER THC or RTD input