MTL 5014 RTD Isolator | 4-Wire Input, 4-20mA Output, IS, DIN Rail, ATEX/IECEx/FM Specs

MTL 5014 RTD Isolator | 4-Wire Input, 4-20mA Output, IS, DIN Rail, ATEX/IECEx/FM Specs

MTL 5014 RTD isolator/transmitter specifications. 4-wire RTD input, 4-20mA output, intrinsic safety, 24V DC, DIN rail. ATEX/IECEx/FM approved for hazardous areas.

Product Overview

The MTL 5014​ is a single-channel, 4-wire RTD (Resistance Temperature Detector) isolator and transmitter​ from MTL's 5000 series. It is engineered to accept a true 4-wire RTD input​ from a hazardous area, provide intrinsic safety (IS) isolation, signal linearization, and conditioning, and deliver a precise, isolated 4-20mA output​ to a safe-area control system. Certified for Zone 1 hazardous locations​ (ATEX, IECEx, FM), it ensures accurate temperature measurement while providing galvanic isolation and protection for critical process loops.

Technical Specifications

Note: Specifications are based on MTL 5000 series documentation. Always verify with the latest product datasheet for the specific region and model variant.

Key Features

• True 4-Wire RTD Measurement:​ Eliminates errors caused by lead wire resistance, providing the highest accuracy.

• High Accuracy & Stability:​ ±0.1% accuracy with excellent long-term stability and low temperature drift.

• Intrinsic Safety Barrier:​ Certified for Zone 1/21 hazardous areas, protecting both field and control equipment.

• Wide RTD Compatibility:​ Supports all common industrial RTD types (Pt100, Pt1000, Ni100, Cu10).

• Built-in Linearization:​ Converts RTD resistance to a linear 4-20mA signal per international standards (IEC 60751).

• Easy Configuration:​ No software required; set up via onboard DIP switches for RTD type, range, and burnout response.

• Compact & Dense Design:​ Only 12.5mm wide for high-density DIN rail mounting.

• Comprehensive Diagnostics:​ Includes sensor burnout detection with configurable failure mode.

• Galvanic Isolation:​ 500V isolation prevents ground loops and protects against transients.

• Global Hazardous Area Approvals:​ Suitable for installations worldwide.

4-Wire RTD Connection Details

The 5014 uses a 4-wire (Kelvin) connection​ for optimal accuracy:

[RTD Sensor Head]
        A o----[Lead R]----.
                           |
        B o----[Lead R]----+----[RTD Element]----.
                           |                     |
        a o----[Lead R]----'                     |
                                                  |
        b o----[Lead R]--------------------------'

[MTL 5014 Terminal Block]
  I+ (Excitation +) --- Wire A
  I- (Excitation -) --- Wire B
  V+ (Sense +) ------- Wire a
  V- (Sense -) ------- Wire b

• I+, I-:​ Provide a precise, constant current that flows through the RTD element via wires A and B.

• V+, V-:​ Measure the voltage drop directly across the RTD elementvia sense wires a and b.

• Result:​ The resistance of the lead wires (A-a and B-b) does not affect the voltage measurement, thus eliminating lead resistance error.

Supported RTD Ranges (Example for Pt100)

The specific sub-range is selected via DIP switches, defining the 4mA and 20mA points.

Entity Parameters (for Hazardous Area Loop Design)

Note: The connected RTD and its cable in the hazardous area must be considered "Simple Apparatus" or have their own entity parameters that satisfy the intrinsic safety calculation: Uo ≥ Ui, Io ≥ Ii, Po ≥ Pi, Co ≥ Ci, Lo ≥ Li.

DIP Switch Configuration Overview

Refer to the product manual for the exact DIP switch coding table.

Typical Applications

• Process Temperature Monitoring:​ Critical temperature points in reactors, distillation columns, and pipelines in chemical/petrochemical plants.

• Motor and Bearing Protection:​ Winding and bearing temperature monitoring in hazardous area motors.

• Furnace and Kiln Control:​ High-accuracy temperature input for combustion and process heating control.

• HVAC in Hazardous Areas:​ Temperature sensing for heating/cooling systems in classified locations.

• Food & Pharmaceutical:​ Sanitary process temperature measurement requiring high accuracy.

• Energy & Power:​ Transformer, turbine, and generator temperature monitoring.

Important Technical Notes

1. 4-Wire Necessity:​ To achieve the specified ±0.1% accuracy, a true 4-wire RTD and connection is mandatory. Using 3-wire or 2-wire connections will introduce lead resistance errors.

2. Sensor Certification:​ The RTD sensor installed in the hazardous area must be intrinsically safe certified or qualify as a "Simple Apparatus."

3. Loop Power Calculation:​ Ensure the control system's 24V DC power supply can drive the loop: Vsupply > (Vtx_min + V5014_drop + Iloop * Rload). The 5014 itself requires minimal voltage drop (~2-3V).

4. Configuration is Critical:​ Incorrect DIP switch settings (RTD type, range) will result in inaccurate readings. Verify settings against the sensor nameplate and desired range.

5. Cable Specifications:​ Use 4-conductor, twisted, shielded cable for the RTD. Ground the shield at the isolator end only for best noise immunity.

6. Burnout Setting:​ The "Upscale" (high output) setting is typically used for safety-critical applications to force an alarm on sensor failure.

7. Calibration:​ While highly accurate, periodic calibration against a traceable standard is recommended for critical loops. The 5014's input cannot be easily trimmed in the field without a resistance source.

8. SIL Considerations:​ For Safety Instrumented Systems (SIL 2), follow all manufacturer guidelines for configuration, installation, and proof testing.

Note: This data sheet provides general specifications for the MTL 5014 4-wire RTD isolator/transmitter. For complete installation instructions, detailed DIP switch tables, wiring diagrams, intrinsic safety guidelines, and certification details, consult the official MTL 5000 Series Technical Manual​ and the product-specific data sheet. Always ensure the selected configuration matches the field sensor and process requirements.

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