Description
Overview
The TK81 80466-02 from Bently Nevada is a portable dual-function calibration and signal simulation device designed for verification of proximity probe measurement chains and vibration monitoring channels. It combines mechanical displacement calibration with electronic vibration signal generation, allowing complete functional testing of API 670 machinery protection systems.
This instrument is commonly used in commissioning, troubleshooting, and maintenance of rotating machinery monitoring systems where both sensor integrity and monitoring electronics must be validated.
Functional Architecture
The TK81 is designed with two integrated verification methods:
Mechanical Displacement Simulation
A precision micrometer-driven assembly reproduces controlled shaft movement using a hardened steel target. This allows direct validation of probe gap response and linear displacement behavior.
Electronic Signal Generation
An internal signal source generates calibrated vibration and displacement signals that can be injected into monitoring channels or Proximitor® sensor inputs for system-level testing.
Technical Specifications
| Parameter |
Specification |
| Brand |
Bently Nevada |
| Model |
TK81 80466-02 |
| Product Type |
Tunable Filter / Vibration Meter / Calibration Unit |
| Calibration Modes |
Mechanical + Electronic |
| Micrometer Range |
0–25.4 mm (0–1.0 in) |
| Resolution |
0.01 mm |
| Accuracy |
±0.025 mm |
| Target Material |
AISI 4140 Hardened Steel |
| Probe Compatibility |
5 mm, 8 mm, 11 mm, 14 mm |
| Signal Types |
DC ramp / AC sinewave simulation |
| Frequency Range |
10 Hz – 5 kHz (typical) |
| Output Interface |
High-impedance BNC connector |
| Power Supply |
Internal battery or external AC adapter |
| Operating Time |
Approx. 6–8 hours |
| Operating Temperature |
0°C to +50°C |
| Storage Temperature |
-20°C to +70°C |
| Humidity |
95% non-condensing |
| Housing |
Aluminum body with steel calibration mechanism |
| Dimensions |
200 × 150 × 120 mm |
| Weight |
2.0 kg |
System Testing Functions
The TK81 enables full-loop validation of vibration monitoring systems:
-
Proximity probe gap voltage verification
-
Linear response validation across full measurement range
-
Proximitor® sensor signal integrity testing
-
Alarm threshold and scaling verification
-
Monitor channel response simulation
-
Combined mechanical and electronic system diagnostics
The dual-mode design allows technicians to isolate faults between sensors, cabling, and monitoring electronics.
Typical Applications
-
Rotating machinery commissioning
-
API 670 compliance verification
-
Vibration monitoring system troubleshooting
-
Proximity probe calibration
-
Machinery protection loop testing
-
Field maintenance and diagnostic service
FAQ
What is the main function of the TK81?
It is used to validate proximity probe systems and vibration monitoring channels using both mechanical displacement and electronic signal simulation.
Can it test complete monitoring loops?
Yes. It supports end-to-end testing from probe input through to monitor output and alarm response.
Is external vibration equipment required?
No. The internal calibration and signal generation functions eliminate the need for external vibration sources.
