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This dual temperature monitor provides continuous thermal measurement for rotating machinery components. It accepts RTD and thermocouple inputs for accurate temperature readings. The unit integrates into the Bently Nevada 3300 monitoring system rack.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | 3300/36 |
| Product Type | Dual Temperature Monitor |
| Supply Voltage | 24 V DC ±10% |
| Power Consumption | 8 W (maximum) |
| Input Channels | 2 x RTD (3-wire Pt100) or 2 x thermocouple (J/K) |
| RTD Range | -50°C to +250°C |
| TC Range (J) | 0°C to +750°C |
| TC Range (K) | 0°C to +1200°C |
| Resolution | 16-bit |
| Accuracy | ±0.2% of full scale (at 25°C) |
| Outputs | 2 x 4–20 mA (isolated, configurable) |
| Alarm Relays | 4 x Form C (SPDT, 2 A at 30 V DC) |
| Communication | 1 x RS-485 (Modbus RTU) |
| CJC | Built-in, software-calibrated |
| Status Indicators | 6 x LED (Power, OK, 2 x Alert, 2 x Danger) |
| Mounting | Backplane rack |
| Dimensions (W x H x D) | 26 mm x 223 mm x 175 mm |
| Weight | 0.43 kg |
Mechanical Design and Rack Integration
This dual temperature monitor follows the standard 3300 series rack form factor. Its 26 mm width occupies a single slot in the chassis. The unit weighs 0.43 kilograms and features a rugged front panel. All connectors and indicators are front-accessible for convenient installation.
Power Supply and Electrical Characteristics
The device operates from a 24 V DC supply with a ±10 percent tolerance. It consumes a maximum of 8 watts during full operation. The module includes reverse polarity protection for the supply input. Internal regulation ensures stable performance across varying supply conditions.
Input Configuration and Sensor Compatibility
Two independent channels accept either RTD or thermocouple sensors. The module supports 3-wire Pt100 RTDs for accurate low-temperature measurement. It also handles J and K type thermocouples for high-temperature applications. The built-in cold junction compensation ensures accurate thermocouple readings. Users can configure each channel individually via software.
Measurement Performance and Accuracy
The 16-bit resolution delivers precise temperature measurements across a wide range. The accuracy reaches ±0.2 percent of full scale at room temperature. RTD inputs cover from -50°C to +250°C for bearing monitoring. Thermocouple inputs extend to +1200°C for exhaust and process temperatures.
Output and Alarm Capabilities
Two isolated 4–20 mA outputs transmit temperature data to control systems. Users can configure each output with its own scaling and range. Four Form C relays provide alert and danger alarm functions. These relays handle up to 2 amperes at 30 V DC. The module also includes a digital output for overall module status.
Communication and Remote Monitoring
An RS-485 port supports Modbus RTU for remote configuration and data access. This interface allows integration with SCADA and DCS systems. Users can read real-time temperatures and alarm status remotely. The module also logs peak values for historical trend analysis.
Diagnostic Features and Status Indication
Six front-panel LEDs provide immediate channel status visibility. The Power LED confirms correct supply voltage is present. The OK LED indicates normal sensor operation and module health. Two Alert LEDs illuminate when temperature exceeds warning thresholds. Two Danger LEDs activate when temperature reaches shutdown levels.
Application Suitability
This temperature monitor serves critical rotating equipment across many industries. It works effectively with turbines, compressors, pumps, and generators. The device also monitors bearings, windings, and process fluids. Its operating temperature ranges from -20°C to +65°C.