Skip to product information
HEIDENHAIN GAP 1081 Vertical Gap Encoders
  • HEIDENHAIN GAP 1081 Vertical Gap Encoders
  • HEIDENHAIN GAP 1081 Vertical Gap Encoders
HEIDENHAIN GAP 1081 Vertical Gap Encoders

HEIDENHAIN GAP 1081 Vertical Gap Encoders

The HEIDENHAIN GAP 1081 is an incremental exposed linear encoder for vertical gap measurement. It measures the distance between a measuring mirror and a scanning head, providing out-of-plane feedback for precision positioning and metrology. A mirror up to 3040 mm long allows continuous measurement while an axis moves across a plane.

Technical Data

  • Measuring components: GAP 1001 mirror and AK GAP 108 scanning head
  • Mirror: glass or glass ceramic with an OPTODUR surface layer
  • Mirror measuring length: selected lengths from 20 to 3040 mm
  • Nominal scanning gap: 4.139 mm
  • Measuring range: ±2 mm
  • Reference mark: possible upon request
  • Data interface: 1 VPP
  • Signal period: 2.22 µm ±0.002 µm
  • Cutoff frequency: ≥27 kHz at −3 dB
  • Traversing speed: 3.6 m/min
  • Accuracy grade: ±0.2 µm for stationary measurement in the measuring direction; ±20 µm for motion perpendicular to the measuring direction
  • Interpolation error: ±2 nm
  • Non-reproducible position error: ±5 nm
  • Electrical connection: 0.5 m, 1 m or 3 m cable with 15-pin D-sub connector; interface electronics in the connector
  • Maximum cable length: 30 m with specified cable; 3 m during signal adjustment with PWM 21
  • Supply voltage: DC 5 V ±0.25 V
  • Current consumption: ≤200 mA without load
  • Operating temperature: 10 °C to 40 °C
  • Laser classification: Class 3R

Selection and installation

Select the measuring mirror and scanning head together. Mirror length is the travel length across the plane, not the vertical measuring range. The accuracy specification depends on whether measurement is stationary or takes place during motion perpendicular to the measuring direction. Confirm mounting, mirror material, cable length, reference-mark requirements and signal adjustment before ordering.

The GAP 1081 uses visible laser radiation. Follow the laser-safety and installation instructions for the selected components. Do not look directly into the beam.

Documents

GAP 1081 specifications and dimensions, February 2026 catalog extract (PDF)

MULTI-DOF measurement technology brochure, February 2026 (PDF)

Machine down? Ask about expedited repair or replacement options. Include the scanning-head ID, mirror ID and measuring length so we can identify the correct replacement.