MTL4575 | MTL Instruments | Temperature Converter

General Information

• Number of Channels: One

• Shipping Weight: 1 kg

Input Signal Compatibility

• Signal Source Types:

• Pt 100, Pt 500, Pt 1000

• Cu-50, Cu-53

• Ni 100, Ni 500, Ni 1000 (DIN 43760)

• Thermocouples (THC): Types J, K, T, E, R, S, B, N (to BS 60584) and XK

• Millivolt Input: mV input

• RTDs (2/3/4-wire platinum to BS 60751):

• Location of Signal Source:

• Zone 0, IIC, T4-T6 hazardous area

• Division 1, Group A, hazardous location

Input Specifications

• Input Signal Range:

• –75 to +75 mV

• 0 to 400 Ω (0 to 1000 Ω for Pt & Ni sensors)

• Input Signal Span:

• 3 to 150 mV

• 10 to 400 Ω (10 to 1000 Ω for Pt & Ni sensors)

• RTD Excitation Current: 200 µA nominal

• Cold Junction Compensation: Automatic or selectable

• Cold Junction Compensation Error: ≤ ±1.0°C

Performance

• Common Mode Rejection: 120 dB (240V at 50/60Hz, 500ms response)

• Series Mode Rejection: 40 dB at 50/60Hz

• Calibration Accuracy (at 20°C, 500ms response):

• mV/THC: ±15 µV or ±0.05% of input value (whichever is greater)

• RTD: ±80 mΩ

• Output: ±11 µA

• Temperature Drift (typical):

• mV/THC: ±0.003% of input value/°C

• RTD: ±7 mΩ/°C

• Output: ±0.6 µA/°C

• Example (RTD Input - 500ms response):

• Span: 250 Ω

• Accuracy: ±(0.08/250 + 11/16000) × 100% = 0.1% of span

• Temperature Drift: ±(0.007/250 × 16000 + 0.6) µA/°C = ±1.0 µA/°C

Output & Alarms

• Output Range: 4 to 20 mA (nominal, into 600 Ω max)

• Alarm Output (Configurable):

• Relay ON in alarm

• 250 mA @ 35V max

• Early Burnout Detection (for thermocouples):

• Alarm triggers when loop resistance increases > 50 Ω

• Safety Drive on Sensor Failure:

• Configurable to Upscale, Downscale, or Off

Electrical Characteristics

• Maximum Lead Resistance (THC): 600 Ω

• Response Time: Configurable (default: 500 ms)

• For accuracy at 100/200 ms, contact MTL

• LED Indicators:

• Green: Power and status

• Yellow: Alarm (on when contacts are closed)

• Maximum Current Consumption (at 20 mA signal): 50 mA @ 24V

• Power Dissipation (at 20 mA signal): 1.2 W @ 24V

• Safety Description: Refer to certificate for parameters.

• Um = 253V rms or dc

Configuration

• Configurator:

• Personal computer running MTL PCS45 software

• Interface:PCL45USB serial interface