Understanding Encoder part numbers: A guide to getting the right encoder
- sales31252
- Aug 11
- 2 min read
Choosing the correct encoder can sometimes feel like decoding a language of its own. Encoder part numbers often contain a combination of letters and numbers that describe important details about the product, from its size and mounting configuration to its resolution, output and electrical connection.
Understanding what these codes mean can make it much easier to identify the right encoder for your application and avoid ordering the wrong specification.
What Information Is Included in an Encoder Part Number?
There is no universal format for encoder part numbers. Each manufacturer may use a different coding system, but most part numbers contain information relating to several key specifications.
These can include:
Encoder type – such as incremental or absolute
Mechanical configuration – including shaft size, mounting and housing dimensions
Resolution – often expressed as pulses per revolution (PPR) for incremental encoders
Output signal – such as HTL, TTL, push-pull or other interfaces
Electrical connection – for example, cable, connector or terminal configuration
Supply voltage – the required operating voltage
Protection rating – such as an IP rating
Direction or rotation information – depending on the encoder design
A small change in one section of a part number can therefore represent a significant difference in the encoder's specification.
Why Is the Part Number Important?
The part number provides a quick way of identifying the exact encoder configuration.
Two encoders may look almost identical but have different electrical outputs, resolutions or shaft dimensions. Using the wrong specification could result in compatibility problems or inaccurate feedback within your machine.
This is particularly important when replacing an existing encoder. Rather than choosing an encoder based solely on appearance, it is important to check the complete part number and compare the technical specifications.
How Do You Decode an Encoder Part Number?
The best place to start is the manufacturer's datasheet or product catalogue. These documents normally provide a breakdown of the part-number structure and explain what each character represents.
For example, a part number might contain separate sections identifying the encoder series, mechanical design, resolution, output type and connection.
It's important not to assume that the same letter or number means the same thing across different manufacturers. A particular code used to describe an output type by one manufacturer may have a completely different meaning elsewhere.
Need Help Identifying an Encoder?
If you're unsure what an encoder part number means, or you're looking for a replacement, checking the complete part number is the safest starting point.
At Encoders UK, we can help you identify the correct encoder specification and find a suitable solution for your application. If you have an existing encoder and are unsure what the part number means, providing the full code can help ensure you get the right replacement.
0121 378 5577
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