Product Overview
The MTL 8711-CA-NS is a high-performance signal isolator developed by MTL, a pioneer in industrial signal conditioning and explosion protection solutions. Designed to address signal interference and ground loop issues in industrial automation systems, this module safely isolates, conditions, and transmits analog signals (such as 4-20 mA or 0-10 V) between field sensors/transmitters and control systems (DCS/PLC). The MTL 8711-CA-NS is widely used in industries like oil & gas, petrochemicals, and water treatment, where reliable signal transmission is critical for process control and safety. By providing galvanic isolation (up to 2.5 kV AC) between input, output, and power circuits, the MTL 8711-CA-NS eliminates ground loop currents that cause signal distortion, protecting sensitive control equipment and ensuring accurate data acquisition. Its rugged design resists EMI/RFI interference and harsh environmental conditions (temperature fluctuations, humidity, dust), making the MTL 8711-CA-NS a dependable choice for demanding industrial applications.
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Technical Specifications
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Parameter
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Value
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Product Model
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MTL 8711-CA-NS
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Manufacturer
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MTL (Measurement Technology Ltd.)
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Product Type
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Analog Signal Isolator (Current/Voltage)
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Input Signal Type
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4-20 mA DC (current); 0-10 V DC (voltage, selectable)
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Output Signal Type
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4-20 mA DC (current); 0-10 V DC (voltage, matching input)
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Isolation Voltage
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2.5 kV AC (input to output; input to power; output to power)
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Accuracy
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±0.1% of full scale (at 25°C ambient)
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Operating Voltage
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24 V DC (nominal); 18-32 V DC (range)
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Operating Temperature
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-20°C to +60°C (-4°F to +140°F)
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EMI/RFI Immunity
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Complies with IEC 61000-6-2 (industrial environment)
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Mounting Type
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DIN rail (35mm standard, EN 50022)
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Power Consumption
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<1.5 W (typical, at 24 V DC)
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Response Time
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<10 ms (90% step response)
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Key Features and Benefits
High-Isolation Performance for Signal Integrity
The MTL 8711-CA-NS provides 2.5 kV AC galvanic isolation across input, output, and power circuits—effectively breaking ground loops that are common in industrial systems with multiple grounded devices. Ground loops cause signal drift, noise, and inaccuracies, which can lead to incorrect process control decisions. By isolating these circuits, the MTL 8711-CA-NS ensures that analog signals from sensors (e.g., pressure, flow, temperature transmitters) are transmitted to the DCS/PLC with minimal distortion, maintaining measurement accuracy of ±0.1% of full scale. This reliability is critical for processes that require tight control, such as chemical batch mixing or oil pipeline pressure regulation.
Flexible Signal Compatibility
Supporting both 4-20 mA current signals and 0-10 V voltage signals (with easy configuration via DIP switches), the MTL 8711-CA-NS adapts to a wide range of industrial sensors and transmitters. This flexibility eliminates the need for multiple isolator models, simplifying inventory management and reducing costs. Whether connecting a 4-20 mA pressure transmitter in an oil refinery or a 0-10 V level sensor in a water treatment plant, the MTL 8711-CA-NS ensures seamless signal conversion and transmission, making it a versatile solution for diverse automation needs.
Robust EMI/RFI Protection & Environmental Durability
Engineered for harsh industrial environments, the
MTL 8711-CA-NS features built-in EMI/RFI filtering that complies with IEC 61000-6-2 standards. This protection shields the module from electrical interference generated by nearby motors, variable frequency drives (VFDs), or high-voltage power lines—preventing signal corruption and false readings. Additionally, the module’s rugged construction (wide operating temperature range of -20°C to +60°C, resistance to humidity and dust) ensures reliable performance in challenging settings, such as outdoor oil rigs or indoor chemical processing plants. Its long mean time between failures (MTBF) of over 1.5 million hours further reduces maintenance costs and unplanned downtime.
Easy Integration & Installation
The MTL 8711-CA-NS is designed for plug-and-play integration with standard DCS/PLC systems (e.g., Siemens PCS 7, Honeywell Experion) and requires no proprietary software or complex programming. Its compact DIN rail mounting design (17.5mm width) saves valuable rack space, allowing for dense installation in control panels. Terminal blocks with clear labeling simplify wiring, reducing installation time and the risk of wiring errors. For retrofits, the module can be easily added to existing systems without disrupting ongoing operations—making it a cost-effective solution for upgrading signal integrity in legacy automation setups.
Related Models
- MTL 8711-IA-NS – Current-input only variant (4-20 mA), optimized for applications where only current signals are used (e.g., flow transmitters).
- MTL 8711-VA-NS – Voltage-input only variant (0-10 V), ideal for sensors that output voltage signals (e.g., temperature transducers).
- MTL 8712-CA-NS – Dual-channel signal isolator, providing isolation for two independent analog signals (4-20 mA/0-10 V) to save space in high-density control panels.
- MTL 8711-CA-HS – High-speed variant with a response time of <5 ms, designed for fast-changing processes (e.g., dynamic pressure monitoring in gas turbines).
- MTL 8711-CA-IS – Intrinsically safe version (ATEX/IECEx Zone 1), suitable for hazardous areas where both signal isolation and explosion protection are required.
- MTL 8713-CA-NS – 3-wire transmitter-powered isolator, eliminating the need for a separate power supply by drawing power from the 4-20 mA loop.
- MTL 8711-CA-T – High-temperature variant (operating range: -40°C to +70°C), optimized for extreme environments like steel mills or desert-based oil facilities.
Distributor & Service Highlights
As a certified partner of MTL, Bently Nevada, and Honeywell, we provide critical signal conditioning and explosion protection components for oil & gas, chemical, and water treatment industries. For the MTL 8711-CA-NS, we offer:
- Pre-sales Support: Expert technical consultation to confirm signal compatibility (current/voltage), isolation requirements, and integration with your existing DCS/PLC system—ensuring the module meets your specific process needs.
- After-sales Service: Dedicated troubleshooting, calibration assistance, and a one-year warranty on all purchases. Our team can also provide on-site support for installation and commissioning to verify signal integrity.
- Fast Availability: Expedited delivery for emergency replacements, minimizing downtime in critical processes where signal loss could disrupt operations (e.g., oil pipeline control or chemical reactor monitoring).
If you cannot find the model you need (including the MTL 8711-CA-NS or related signal isolators), please contact us immediately.
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