ME15 Absolute SSI Rotary Shaft Encoder

  • Rotation Slide


    This is a legacy product. While it is available at this time, please note that we anticipate phasing it out (retiring) it by the end of 2023. If you have any questions, or would like assistance seeking an alternative solution, please contact our sales department.


  • Ideal for high-shock and vibration applications
  • IP67 rating (dust tight, water tight)
  • Compact low cost design
  • 10 bit resolution
  • Single or Multiplex applications
  • (2) connection options
  • Servo mounting styles
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    ME15 Analog SSI user manual

    ME15 Analog SSI drawings PDF version










    AMCI ME15 Absolute SSI Rotary Shaft Encoder

    AMCI's ME15 SSI rotary shaft encoder is designed for cost sensitive applications that require bullet-proof reliability. The ME15 magnetic encoder measures just under 1.5" in diameter and is engineered for heavy-duty operation across a variety of industries. The encoder's IP67 rating protects against dust and moisture, and the sensor's compact design only relies on two components, ensuring trouble free operation.

    AMCI's ME15 SSI encoder utilizes a small diametrically polarized magnet and a custom ASIC that contains an array of Hall sensors that generate a voltage when exposed to a magnetic field. The ASIC detects the change in magnetic flux distribution as the magnet rotates above it and outputs a voltage level that represents the angular position. The ASIC also has the ability to ignore any interfering magnetic fields, allowing the ME15 to operate in areas of high external fields.

    Summary: The ME15’s small size, high reliability, IP67 protection rating and low cost make it an ideal replacement for potentiometers and small industrial encoders. A sturdy machined housing and a high resistance to shock and vibration make these encoders an ideal fit and capable withstanding difficult environmental conditions, including electromagnetic interference (EMI) noise generated by neighboring currents.

    Available Versions (x=any selection)

    ME15SSxS1Kxxx: Absolute SSI single-turn rotary encoder
    Price | $565/ea

    Note: Pricing is US Domestic only




    Consult the factory for availability

    Contact Sales


    Mechanical Specifications

    ME15 Absolute SSI Rotary Shaft Encoder
    Package Style:Size 15 (1.5" diameter) aluminum housing with servo mounting
    Housing:Aluminum housing
    Shaft:1/4" or 6mm diameter stainless
    Shaft loading:1/4" and 6mm shafts:
    10 lbs. radial/5 lbs. axial maximum shaft loading. Bearing life rated at
    2X10^9 revolutions minimum at maximum shaft load.
    Starting Torque:2 oz. in max @25° C (with standard shaft seal)
    0.2 oz. in max @25° C (no shaft seal)
    Moment of inertia:1.75 * 10^-5 oz-in-sec^2
    Maximum speed:20,000 RPM
    Connection Options:-Seven pin, M9, End Connector
    -Integral Cable in 1.5’, 3’, 6’ or 10’ lengths
    28 AWG, 7 conductors with overall shield

    Electrical Specifications

    ME15 Absolute SSI Rotary Shaft Encoder
    Resolution:10 bits, 1024 counts
    Accuracy:+ 0.5°
    Direction of Increasing Counts:CW or CCW, specified when ordering
    Rotational Measuring Range:360 degrees continuous
    Protection:Over and Reverse voltage protection, short circuit protected
    Power Up Setting Time:20ms


    ME15 Absolute SSI Rotary Shaft Encoder
    Enclosure:IP67 (valid only with working shaft seal)
    Shock:50 G's for 11 mSec
    Vibration:20 g, 5 to 2,000 Hz
    Operating temperature:-40° C to 85° C standard

    SSI Output Specifications

    ME15 Absolute SSI Rotary Shaft Encoder
    Power Requirements:4.75 to 30 Vdc
    Output code:binary
    Enable input:When the Enable Input is high (+5Vdc) the ME15’s outputs will enter a
    High Impedance state. This disables the encoder and allows several SSI
    ME15 encoders to be multiplexed together.

    When the Enable Input is pulled low, the ME15 SSI encoder will output
    its SSI data. If the ME15 SSI encoder is to be used continuously, this
    can be achieved by simply connecting the Enable Input to DC Return.

    Input Voltage Range:
    Enabled (Low) = 0 to 0.8Vdc
    Disabled (High) = 2V to 5.5Vdc

    Input Current: 10uA @5Vdc for both High and Low states
    SSI clock frequency:100kHz to 1MHz

    Mating Connector: (sold seperately)

    AMCI Part NumberBinder Part Number
    MS-999 0426 00 08

    Connector Pinout: 7 pin male M9 connector or 7 conductor Integral Cable

    SignalConnectorIntegral Cable
    +DC input1Red
    DC return2Black

    SSI Protocol

    The following diagram shows the signal protocol of the SSI version of the ME15 encoder. This format is used on ME15 Encoders both with and without the multiplexing option.


    Tint = The time of one interrogation
    Tclk = The period of the clock pulse
    Tidle = The time between the last Clock pulse and the first falling edge of the next clock cycle
    Tm = The time that the Stop bit is valid, typically 15 to 20 μs

    Note 1: Use only 10 SSI clock pulses if only the absolute angular position data is needed.
    Note 2: On ME15 SSI encoders with the multiplexing option, there will be separate Enable Lines for each encoder, but the Data and Clock lines of all of the ME15's will be connected together.
    Note 3: When using the multiplexing option, a high signal on the Enable input disables the encoder by placing the Data Output lines in a high impedance state. When the Enable input is pulled low, the ME15 encoder will continuously output its data until the Enable input is again pulled high. The enable input must not be left floating.


    SSI Interfaces

    SSI Interfaces Learn More


    Cables Learn More


    Connectors Learn More

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    Ordering Information

    AMCI's sales team takes the hassle out of placing your order. We'll advise on product selection, alternatives, lead times, and present you with point of purchase options. Call (860) 585-1254 or email AMCI sales today! 

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    create your part number

    Generate your ME15 encoder part number by using this helpful ordering guide. Starting from left to right, use the following diagram and table to choose the desired options. Each gray box must contain one or two alphanumeric character. Please note the following…

    Part Number CharacterAbsolute SSI DuraCoder SelectionsMost Popular Selections
    Mounting style:S = 1.5" Shaft style servo mountS
    (Servo mount)
    Shaft Seal Type:S = Shaft seal (IP67 rating)S
    (Shaft Seal)
    Shaft Diameter:2 = 1.4"
    6 = 6mm
    (1/4" shaft)
    Output Type:S = SSIS
    Output Scaling:1 = binary1
    Angular Range:K = 360°K
    Direction:P = CW increasing looking at shaft
    N = CCW increasing looking at shaft
    (CW increasing)
    Connection Type:E = End Connect Mating Connector
    (MS-9 mating connector sold separately)
    FL = Integral Cable
    (End connector)
    Integral Cable Length:Specify the length in feet
    Standard lengths = 1.5', 3', 6', and 10'
    Blank if End Connector specified