Introduction
The Sensata BEI Sensors ES20 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 ES20 is not physically coupled to external equipment, the problem of shaft misalignment is eliminated, meaning no more broken couplings! The ES20 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.
Electrical Specifications
| Supply Voltage | 5 to 28 VDC available |
| Voltage/Output | 28V/V: Line Driver, 5–28 VDC in, Vout = Vin
28V/5: Line Drive, 5–28 VDC in, Vout = 5 VDC 28V/OC: Open Collector, 5–28 VDC in, OC out |
| Current Requirements | 100 mA typical + output load, 250 mA (max) |
| Protection Level | Reverse, overvoltage and output short circuit |
| Code | Incremental |
| Output Format | 2 Channels in quadrature, with gated index and complementary outputs |
| Cycles per Shaft Turn | 1 to 1,024 (See Table 1) |
| Frequency Response | 100 kHz |
| Output Terminations | See Table 2 |
ES20 Mechanical Specifications
| Mating Shaft Diameter | 1/4″ and metric versions |
| Magnetic Coupling Cover | Engineered plastic |
| Starting Torque | 0.5 oz-in max |
| Enclosure | Aluminum (sealed aluminum castings) |
| Maximum RPM | 5000 RPM |
| Moment of Inertia | 60.2 × 10⁻⁴ oz-in-sec² |
| Maximum Acceleration | 25,000 rad/s/s |
| Torsional Flexibility | 0.37 deg/oz-in |
| Kinematic Error | 3 arc-min RMS |
| Weight | 13 oz |
Environmental Specifications
| Temperature | Operating, 0° to 70°C; storage (non-operating), -25° to 90°C.
Consult the factory for extended temperature ratings. |
| Shock | 25 g’s for 11 msec duration |
| Vibration | 5 to 2000 Hz @ 10 g’s |
| Humidity | 100% RH with condensation |
| Enclosure Rating | IP67 / IP68 (Consult factory for IP68 applications) |
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