EPRO PR9350/02-811 Two-Wire Vibration/Position Transmitter

Description

1. Core Overview & Working Principle

2. Key Features & Functions

• Loop-Powered (2-Wire Operation):​ Simplifies installation and reduces wiring costs; powered by the 4-20 mA loop (typically 12-30 V DC from the receiving device).
• Dual-Channel Capability:​ The /02​ in the model number indicates it is a two-channel device. It can process two independent input signals (e.g., from X and Y probes on a bearing) and provide two independent 4-20 mA outputs.
• Wide Input Compatibility:​ Configurable via DIP switches to accept signals from industry-standard proximity probes with sensitivities of 4.0 mV/µm, 8.0 mV/µm (200 mV/mil), or 20 mV/mil.
• Field-Configurable Ranges:​ Output scaling (0% to 100% = 4 to 20 mA) is easily set to match common measurement ranges (e.g., 0-100 µm, 0-200 µm for vibration; 0-2 mm, 0-4 mm for position).
• Local Bargraph Display:​ Features a built-in, multi-segment LED bargraph for each channel, providing instant local visual indication of the vibration or position level.
• Robust Housing:​ Housed in a sturdy, sealed metal enclosure with a high IP rating (e.g., IP65), making it suitable for mounting directly in harsh industrial environments near machinery.
• Electrical Isolation:​ Provides galvanic isolation between the input (probe side) and output (loop side), protecting control system electronics from ground loops and transients.

3. Model Number Breakdown & Specifications

• Number of Channels:​ 2 independent channels.
• Input Signal:​ From eddy current probe system (e.g., EPRO CON0x1 driver). Compatible with standard 8 mm or 11 mm probes.
• Output Signal:​ 2 isolated 4-20 mA signals, linear with input.
• Power Supply:​ 12-30 V DC, loop-powered (2-wire per channel).
• Measurement Ranges (Selectable):​ Vibration: 0-25/50/100/200/400 µm pp. Position: 0-1/2/4 mm.
• Accuracy:​ Typically better than ±1% of full scale.
• Frequency Response:​ 0.5 Hz to 3000 Hz (for vibration).
• Display:​ 10-segment LED bargraph per channel.
• Operating Temperature:​ -30°C to +80°C.
• Enclosure:​ Aluminum, IP65.

4. System Integration & Configuration

• Installation:​ Mounts on a DIN rail, panel, or directly on machinery via its integral bracket. Installed in a local junction box close to the probes to minimize analog signal cable runs.
• Wiring:

  [Probe A + Driver] ----> Input 1 (PR9350/02-811) ----> 4-20mA Out 1+ -----> [PLC/DCS Analog Input]
  [Probe B + Driver] ----> Input 2                       4-20mA Out 2+          (providing loop power)
                                                                |                          |
                                                            Out 1- -----------------------|
                                                            Out 2- -----------------------|

• Configuration (via DIP Switches & Pots):
  1. Set the probe sensitivity​ (e.g., Switch 1-2 for 8.0 mV/µm).
  2. Set the measurement range​ (e.g., Switches 3-5 for 0-100 µm).
  3. Fine-tune 4mA (Zero)​ and 20mA (Span)​ using internal potentiometers for each channel if precise calibration is needed.
• Role:​ Provides a simple, reliable, and standardized interface to bring critical machinery health signals into a plant’s wider control and monitoring network for trending, alarming, and basic operational decisions.

5. Typical Applications

• Basic Machinery Monitoring:​ Adding vibration/position monitoring to pumps, fans, compressors, and turbines where signals need to feed into an existing plant DCS/PLC.
• Auxiliary Equipment:​ Monitoring less critical machines where a full protection system is not warranted.
• OEM Integration:​ Built into skids or machines by OEMs to provide a standard analog output for health monitoring.
• Retrofits:​ Upgrading existing machinery with modern monitoring capability without installing a full rack-based system.