Monitran MTN/1135C Low Profile Accelerometer
- Manufacturer: Monitran
- Category: Accelerometers and Vibration Sensors, Amplified, SENSORS
Vibration monitoring in spindles and high-speed machinery presents significant physical space challenges. Standard sensors add excessive dynamic mass that alters the system's resonant frequency, and their bulk prevents installation within motor housings or shields with restricted access.
This constant-current piezoelectric accelerometer solves space limitations with an ultra-flat, side-exit design. At just 15 mm thick and 25 mm high when assembled, its nominal mass of 30 grams ensures minimal mechanical intrusion. Its key innovation lies in the swivel "Quick-Nut" base (1/2"-20 UNF), which allows the cable exit to be oriented independently of the tightening nut's position, facilitating tight installations without twisting the wiring.
Constructed entirely of stainless steel and sealed to IP67 rating, it is designed to withstand the cutting fluids and oil mist typical of machine tools. It includes a high-strength steel braided ETFE cable and provides a galvanically isolated, pure AC output, preventing harmful ground loops in harsh industrial environments.
- Ultra-compact dimensions of 15 x 25 mm and ultralight dynamic mass (30 g).
- Standard sensitivity of 100 mV/g (optional: 10, 30, 50 or 500 mV/g) of 0.8Hz to 10KHz.
- Torsion-free assembly using quick-release rotating nut Quick-Nut (1/2″-20 UNF).
- integral cable ETFE with stainless steel mesh reinforcement.
Plant Engineering (FAQ)
1. What advantage does the "Quick-Nut" base offer over a standard threaded bolt?
The quick-release rotating nut allows the sensor to be mechanically attached to the machine without having to rotate the entire accelerometer body. This prevents fatal twisting of the integral cable when installing it in tight spaces or spindle galleries.
2. Why is base isolation crucial in industrial applications?
The galvanic isolation of the base ("Base Isolated") prevents direct electrical contact with the machine's metal casing. This completely eliminates electromagnetic noise induced by ground loops or harmonics from variable frequency drives (VFDs).
3. Is it suitable for spectrum analysis in high-speed machine tools?
Absolutely. With a very high mounted resonant frequency of 22 kHz and a minuscule weight of 30 grams, it provides crisp and reliable readings up to 10 kHz without generating additional mass that dampens the actual dynamics of the analyzed bearing.
Properties
| Feature | Technical Specification |
| Sensor Type | Piezoelectric Accelerometer (Constant Current) |
| Standard Sensitivity | 100 mV/g (±10% at 80 Hz) |
| Optional Ranges | 10, 30, 50, and 500 mV/g |
| Frequency Response | 0.8 Hz to 10 kHz (±5%) |
| Resonance Frequency | 22 kHz (Nominal to the assembly) |
| Dynamic Range | ±50 g |
| Electrical Insulation | Isolated Base (Ground Loop Prevention) |
| Electrical Noise | < 0.1 mg (Maximum) |
| Operating Temperature | -25 °C to +140 °C |
| Body Material | Solid Stainless Steel |
| Mechanical Fixation | Quick-Nut Swivel Base (1/2″-20 UNF Female) |
| Dynamic Mass | 30 grams (Nominal) |
| Electrical Connection | Integral ETFE Cable (5m Stainless Steel Outer Mesh) |
| Nutritional Requirements | 0.5 mA to 8 mA (Bias Voltage 12V DC) |
| Degree of Protection | IP67 (Industrial hermetic sealing) |
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