Intrinsically Safe Velocity Transducer Monitran MTN/2285
- Manufacturer: Monitran
- Category: Accelerometers and Vibration Sensors, Amplified, ATEX, SENSORS
Continuous vibration monitoring in potentially explosive atmospheres, such as petrochemical plants, refineries, or gas platforms, requires equipment that meets the strictest intrinsic safety standards. In these Ex zones, a standard sensor poses an ignition risk due to accumulated electrical energy, while non-certified solutions necessitate costly maintenance shutdowns for spot measurements.
This intrinsically safe speed transducer addresses this need with its ATEX and IECEx (Ex ia IIC T6 Ga) certified architecture. It provides a 4-20 mA current signal directly proportional to the RMS speed (mm/s), enabling direct connection to industrial control systems via Zener barriers. Its top-entry design and Faraday cage-protected electronics ensure accurate, noise-free measurement even in environments with high electromagnetic interference.
Constructed entirely from solid stainless steel with an IP67 protection rating, the MTN/2285 is built to withstand corrosion and extreme weather conditions. Its 4-pin M12 industrial connector facilitates quick and watertight installation, ensuring constant and safe monitoring of the health of motors, fans, and compressors in the most hazardous areas of the facility.
- Intrinsic safety certification ATEX and IECEx Group II for Zones 0, 1 and 2.
- Industrial outlet of 4-20 mA proportional to RMS speed (configurable range).
- Linear frequency response of 2 Hz to 1 kHz for early fault detection.
- Robust chassis of stainless steel galvanically isolated from the sensor.
Technical Frequently Asked Questions
1. Is the use of Zener barriers mandatory with this sensor?
Yes. As an intrinsically safe device, to maintain certification validity in classified areas, the MTN/2285 must be installed with an intrinsically safe barrier (such as the MTL7787+) that limits the energy reaching the sensor.
2. What speed measurement ranges are available?
The sensor can be factory-configured with scales of 0-10, 0-20, 0-25, 0-50, or 0-100 mm/s RMS. This allows the sensitivity of the 4-20 mA signal to be adapted to the specific vibration severity of the monitored machine.
3. Why is the temperature range lower than that of other Monitran sensors?
The temperature range (-55 °C to +65 °C) is strictly limited by the requirements of the T6 intrinsic safety certification. This ensures that the sensor's surface temperature never reaches a point that could ignite the gases present in the Ex atmosphere.
Properties
| Feature | Technical Specification |
| Sensor Type | Speed Transducer (Intrinsically Safe) |
| Ex Certification | ATEX and IECEx Group II (Zones 0, 1, 2) |
| Analog Output | 4-20 mA DC (Proportional to RMS Speed) |
| Power Range | 12V to 32V DC |
| Frequency Response | 2 Hz to 1 kHz (±10%) |
| Resonance Frequency | 5 kHz (Nominal) |
| Electrical Insulation | Electronics in an isolated Faraday cage |
| Measuring Range | 0-10 up to 0-100 mm/s RMS (Configurable) |
| Operating Temperature | -55 °C to +65 °C (T6 certified range) |
| Body Material | Solid Stainless Steel |
| Dynamic Mass | 140 grams (Nominal) |
| Electrical Connection | 4-pin M12 connector |
| Configurable Models | MTN/2285I (1/4″ UNF) and MTN/2285IQ (Quick Fit) |
| Tightening Torque | 8 Nm |
| Degree of Protection | IP67 |
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