The HMT25 geared multi-turn encoder provides absolute position information over multiple turns of the input shaft. It keeps track of the exact position even during periods of power loss without the need for a battery backup. The HMT25 series is capable of outputs up to 4096 counts per turn and can count up to 4096 turns—a total of 24 bits or 16,777,216 positions. Units are enclosed in a 2.5- inch diameter sealed package to withstand rugged environments and they carry an IP 66 environmental rating. These encoders meet the long travel and high resolution requirements of robotics, rolling mills, rotary tables, cable winding, printing, converting and material handling systems.
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Contact UsShaft Diameter | 0.375” (0.5” optional) |
Flat on Shaft | 0.80” long x 0.030” deep |
Shaft Loading | 40 lbs axial, 36 lbs radial (90 lbs axial and 80 lbs radial with 0.5” shaft) |
Shaft Runout | 0.0005 TIR at midpoint of shaft |
Starting Torque at 25°C | 2.5 in-oz (max) |
Bearings | Dual, preloaded, Class ABEC 7 |
Shaft Material | 416 stainless steel |
Bearing Housing | Die cast aluminum with protective finish |
Cover | Die cast aluminum |
Bearing Life | 1 x 1010 at 10% rated load |
Maximum RPM | 6,000 (see frequency response, below) |
Moment of Inertia | 4.3 x 10-4 oz-in-sec2 |
Weight | 16 oz nominal |
Code | Natural binary, gray code or SSI |
Counts per Shaft Turn | 4096, 12 bits |
Number of Turns | up to 4096, 12 bits |
Supply Voltage | 5–28 VDC |
Current Requirements | 130 mA typical + load, 250mA (max) |
Voltage/Output | (See note 3) 28V/V: Line Driver, 5–28 VDC in, Vout = Vin 28V/5: Line Driver, 5–28 VDC in, Vout = 5 VDC 28V/OC: Open Collector, 5–28 VDC in, OCout SSI: 5–28 VDCin/5Vout |
Frequency Response | 100 kHz |
Protection Level | Overvoltage, reverse voltage. Outputs short-circuit protected (1 minute max) |
Output Termination Pinouts | See Tables, in datasheet |
Enclosure Rating | IP66 |
Temperature | Operating, 0° to 70° C; Extended, -40° to +85°C; Storage, -20° to 90° C (to -40° if extended range is called out) |
Shock | 50 g’s 11 msec |
Vibration | 0.3 g’s ramp to 20 g’s from 5 to 40 Hz and 20 g’s from 40 Hz to 2000 Hz |
Humidity | 98% Non-condensing |