MTL4575 TEMPERATURE CONVERTER

MTL4575 TEMPERATURE CONVERTER

The MTLx575 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. A single alarm output is provided and may be configured for process alarm or to provide notice of early thermocouple failure.

MTL4575 TEMPERATURE CONVERTER

SPECIFICATION
·See also common specification
·Number of channels
  One
·Signal source
   THC types J, K, T, E, R, S, B or N to BS 60584 and XK
   mV input
   RTDs 2/3/4-wire platinum to BS 60751
   Pt 100, Pt 500, Pt 1000
   Cu-50 & Cu-53
   Ni 100/500/1000 DIN 43760
·Location of signal source
  Zone 0, IIC, T4-6 hazardous area
  Division 1, Group A, hazardous location
·Input signal range
  –75 to +75mV, or 0 to 400Ω (0 to 1000Ω Pt & Ni sensors)
·Input signal span
  3 to 150mV, or 10 to 400Ω (10 to 1000Ω Pt & Ni sensors)
·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
·Calibration accuracy (at 20°C)
   (includes hysteresis, non-linearity and repeatability)
   Inputs: (500ms response)
  mV/THC: ± 15µV or ± 0.05% of input value
  (whichever is greater)
  RTD: ± 80mΩ
  Output: ± 11µA
·Temperature drift (typical)
  Inputs:
   mV/THC: ± 0.003% of input value/°C
    RTD: ± 7mΩ/°C
   Output: ± 0.6µA/°C
·Example of calibration accuracy and temperature drift
  (RTD input - 500ms response)
   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
·Safety drive on sensor failure
  Upscale, downscale, or off
·Early burnout
  Early burnout detection for thermocouples (when selected)
  Alarm trips when loop resistance increase is > 50Ω
·Output range
  4 to 20mA nominal into 600Ω max.
·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
·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
MTL4575 TEMPERATURE CONVERTER

MTL4575 TEMPERATURE CONVERTER

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MTL4575 TEMPERATURE CONVERTER