Skip to product information
HEIDENHAIN LIF 400 V Vacuum Incremental Linear Encoders
  • HEIDENHAIN LIF 400 V Vacuum Incremental Linear Encoders
  • HEIDENHAIN LIF 400 V Vacuum Incremental Linear Encoders
HEIDENHAIN LIF 400 V Vacuum Incremental Linear Encoders

HEIDENHAIN LIF 400 V Vacuum Incremental Linear Encoders

The HEIDENHAIN LIF 400 V series is an exposed incremental linear encoder for high-vacuum applications. LIF 471V provides TTL signals; LIF 481V provides 1 VPP signals. Both use an LIF 401 R scale with SUPRADUR phase grating. Integrated homing and limit tracks support referencing and end-position detection.

Technical Data

  • Vacuum models: LIF 471V (TTL) and LIF 481V (1 VPP)
  • Scale: LIF 401 R; SUPRADUR phase grating on Zerodur glass ceramic or glass; 8 µm grating period
  • Accuracy grade: ±3 µm
  • Baseline error: no more than ±0.225 µm per 5 mm
  • Measuring lengths: selected lengths from 70 mm to 1640 mm
  • Reference mark: one at the midpoint of the measuring length
  • Analog signal period: 4 µm for LIF 481V
  • TTL signal periods: 0.8, 0.4, 0.2, 0.08 or 0.04 µm, depending on the LIF 471V interpolation option
  • Measuring steps: applications down to 2 nm, subject to interface and downstream electronics
  • Traversing speed: up to 240 m/min for 1 VPP; TTL limits range from 3 to 120 m/min depending on interpolation and scanning frequency
  • TTL referencing speed: maximum 9.6 m/min (40 kHz)
  • Analog interpolation error: ±12 nm
  • Analog RMS position noise: 0.6 nm at a 1 MHz cutoff frequency of the subsequent electronics
  • Supply voltage: 5 V DC ±0.25 V
  • Current: less than 150 mA for 1 VPP; less than 165 mA for TTL, without load
  • Operating temperature: 0 °C to 50 °C
  • Bake-out temperature: 100 °C for the V variants
  • Maximum cable length: 30 m for incremental signals; 10 m for homing and limit signals, with the specified cable
  • Scanning-head mass: 9 g

Vacuum configuration

The vacuum-compatible variants include air vents, specialized cleaning and packaging, and a cable with PTFE insulation and tin-plated copper braiding. The high-vacuum V variants are offered with interface electronics either inside or outside the vacuum. Confirm the feed-through, connector and cable arrangement for the installation. For low outgassing, the product information recommends baking at 100 °C for 48 hours under high-vacuum conditions.

The related LIF 481U is an ultrahigh-vacuum variant with a 120 °C bake-out limit and interface electronics outside the ultrahigh vacuum. Its vacuum-side encoder must not contain electronic components such as signal converters. Do not substitute the V variant for a U configuration without checking the vacuum requirements. Bake-out temperatures are not continuous operating temperatures.

Documents

LIF 471V / LIF 481V / LIF 481U product information (March 2024)

Machine down? Ask about expedited repair or replacement options. Include the complete encoder ID, measuring length, signal interface and vacuum setup so we can identify the right replacement.