MTL5575 MTL Industries Temperature Converter

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

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