
Introduction
The part number 16925-25 is a Seismic Vibration Transmitter manufactured by Metrix Instrument Co. This device is a robust, 2-wire, loop-powered sensor designed for continuous monitoring of overall casing vibration (velocity) on industrial machinery. It integrates a seismic velocity pickup with internal signal conditioning electronics to output a standardized 4-20 mA analog signal that is directly proportional to the vibration level. This simple and reliable design is ideal for providing a continuous vibration health indicator to PLCs, DCS, or control room displays for predictive maintenance and basic machinery protection.
Technical Parameters
The following table outlines the typical technical specifications for the Metrix 16925-25 Vibration Transmitter.
| Parameter Category | Specification |
|---|---|
| Part Number | 16925-25 |
| Description | 4-20 mA Two-Wire Seismic Vibration Transmitter |
| Physical Dimensions (Body) | Approximately 76.2 mm (3.0 in) in height 50.8 mm (2.0 in) in diameter (Excluding mounting thread) |
| Weight | Approximately 0.45 kg (1.0 lb) |
| Measurement Type | Velocity |
| Frequency Range | 4.5 Hz to 450 Hz (270 to 27,000 CPM) - or 10 Hz to 1000 Hz (600 to 60,000 CPM) [Varies by model variant] |
| Output Signal | Two-Wire 4-20 mA |
| Measurement Range | Scalable, typically a range like 0-25 mm/s (0-1.0 in/s) peak or equivalent. |
| Power Supply | 12 to 30 VDC (Loop Powered) |
| Mounting | 1/4-28 UNF threaded stud on the base |
| Electrical Connection | Conduit entry with 1/2" NPT conduit connection |
| Housing Material | Stainless Steel |
| Operating Temperature | -40°C to +85°C (-40°F to +185°F) |
*Note: The "25" suffix often indicates a specific output range and/or a 1/2" NPT conduit connection. The frequency range is a critical differentiator; the 16925 series often includes models optimized for different speed ranges. Always consult the official Metrix datasheet for the precise model variant.*
Application Scenarios
This vibration transmitter is used for general-purpose machinery condition monitoring on a wide variety of rotating equipment where a simple, robust, and continuous vibration signal is required.
Motor Condition Monitoring:
Mounted on the bearing housings of critical motors in manufacturing, power generation, and processing plants. The 4-20 mA signal provides a continuous health indicator to the control system for early detection of imbalance, misalignment, or bearing wear.
Pump Vibration Monitoring:
Installed on centrifugal and positive displacement pumps in water treatment, chemical, and oil & gas facilities. It is particularly useful for pumps with rolling element bearings where casing vibration is a direct indicator of machine health.
Fans and Blowers:
Used on large industrial fans, such as those in cooling towers, HVAC systems, and boiler draft applications, to monitor overall vibration levels and provide an alarm for conditions like imbalance or bearing failure.
Compressors:
Applied to the casing of rotary screw and reciprocating compressors to track overall vibration health, providing an early warning of developing mechanical faults.
General Rotating Machinery:
An ideal and cost-effective solution for non-critical or auxiliary equipment (e.g., conveyors, mixers, gearboxes) where a full machinery protection system is not justified, but basic vibration tracking is desired for a predictive maintenance program.
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