Introduction
The Sensata BEI Sensors ES25 Series Environmentally Sealed Incremental Encoder is a rugged incremental encoder that is environmentally sealed through the use of a magnetic shaft coupling connection. This connection allows the encoder to be completely enclosed and sealed against water ingress. It is rated to IP67 and can operate while fully immersed in one meter of water for up to 30 minutes. The magnetic coupling also allows the encoder to be isolated from high shock and vibration. It also ensures the encoder is dust-tight and resistant to debris in the environment. Since the ES25 is not physically coupled to external equipment, the problem of shaft misalignment is eliminated, meaning no more broken couplings! The ES25 is ideal for applications with heavy wash-downs, temporary water immersions, and excessive environmental debris. It combines the high accuracy, repeatability, and robustness needed for use in harsh environments and can help reduce the costly downtime of your system.
Electrical Specifications
| Parameter | Specification |
| Supply Voltage | 5 to 28 VDC |
| Voltage/Output | Line Driver / Open Collector options |
| Current Requirements | 100 mA typical, 250 mA max |
| Protection | Reverse, overvoltage, short circuit |
| Code | Incremental |
| Output Format | 2-channel quadrature with index |
| Cycles per Turn | 1 to 2048 |
| Frequency Response | 100 KHz |
Mechanical Specifications
| Parameter | Specification |
| Mating Shaft Diameter | 1/4” and metric versions |
| Magnetic Coupling Cover | Engineered plastic |
| Starting Torque | 0.5 oz-in max |
| Enclosure | Aluminum (sealed castings) |
| Maximum RPM | 5000 RPM |
| Moment of Inertia | 60.2 x 10⁻⁴ oz-in-sec² |
| Maximum Acceleration | 24,000 rad/s² |
| Torsional Flexibility | 0.37 deg/oz-in |
| Kinematic Error | 3 arc-min RMS |
| Weight | 18 oz |
Environmental Specifications
| Parameter | Specification |
| Operating Temperature | 0°C to 70°C |
| Storage Temperature | -25°C to 90°C |
| Shock | 25 g, 11 ms |
| Vibration | 5 to 2000 Hz @ 10 g |
| Humidity | 100% RH with condensation |
| Enclosure Rating | IP67 / IP68 |
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