Product Overview
The Bently Nevada TACH100 Standalone Digital Tachometer is a compact, self-contained speed indicator designed for industrial environments. It operates as a stand-alone unit for direct speed indication or as a remote display for permanently installed monitoring systems. When the monitoring system is located in a control room or when no permanent system exists, the TACH100 provides reliable, real-time RPM readings at the machine.
This digital tachometer includes its own power supply, capable of powering a Proximitor sensor at -24 Vdc. It also accepts signal and common wires from an externally-powered Keyphasor Proximity Probe, allowing parallel connection with the monitor rack or directly to the probe. This flexibility makes the TACH100 an essential component for machinery protection and condition monitoring.
Key Specifications
The TACH100 delivers precise speed measurement across a wide operating range. Its 6-digit LED display with 13.2 mm digit height ensures clear readability even from a distance. Measurement accuracy is within 0.015% of input speed, and display hysteresis requires only a 0.003% change in input signal to update the reading.
| Parameter |
Value |
| Measurement Range |
1 to 999,999 rpm |
| Resolution |
1 rpm |
| Accuracy |
0.015% of input speed |
| Display |
6-digit LED, 7 segments, 13.2 mm height |
| Proximitor Power |
-24 Vdc at 20 mA max |
| Supply Voltage |
110-230 Vac, 50-60 Hz |
| Power Consumption |
1.01 W nominal (with 88888 displayed) |
Input and Output Flexibility
The TACH100 accepts signals from any Bently Nevada Proximitor sensor with automatic threshold adjustment. Hysteresis is field-adjustable from 0.2 Vdc to 2.5 Vdc, and events per turn can be set from 1 to 99. This allows customization to match specific machine characteristics.
For output, the tachometer provides a clear digital display. The unit also includes a built-in fuse (1.5 Amp, SB) for electrical protection, ensuring safe operation under industrial conditions.
Environmental Durability
Designed for harsh industrial environments, the TACH100 meets Pollution Degree 2 and Installation Category II standards. It operates in temperatures from 0°C to +60°C and can be stored from -40°C to +85°C. With a maximum relative humidity of 95% (non-condensing) and an altitude rating of 2000 m, it is suitable for most plant locations.
EMC compliance is robust, with testing to IEC 61000-4-2, -4-3, -4-4, -4-5, -4-6, and -4-11, ensuring reliable performance in electrically noisy environments. The unit also meets EN5501 Group 1 Class A for radiated and conducted emissions.
Installation and Setup
Mounting the TACH100 is straightforward. Its compact dimensions—76.2 mm high, 139.7 mm wide, and 149.1 mm deep—allow panel or rack installation. The unit weighs only 1.13 kg, making it easy to handle. Connect the Proximitor sensor or Keyphasor probe wires according to the manual, ensuring proper polarity and grounding. Field-adjustable settings for hysteresis and events per turn allow quick calibration during commissioning.
Applications
The TACH100 is ideal for turbines, compressors, pumps, and other rotating machinery where speed monitoring is critical. Use it as a stand-alone speed indicator for machines without a permanent monitoring system, or as a remote display in control rooms. Its high accuracy and wide range make it suitable for both low-speed and high-speed applications.
Selection Guide
When selecting the Bently Nevada TACH100, verify your sensor compatibility and input signal type. Ensure the supply voltage matches your facility (110-230 Vac). For detailed application support, contact PLC Source PRO for expert guidance and availability. The TACH100 is a reliable, cost-effective solution for your speed indication needs.