Product Overview

• Manufacturer / Model: MGL Avionics (probe made by Centroid Products), sold under part numbers LEVELSND‑12 (12″) and LEVELSND‑24 (24″) 

• Lengths Available: 12 inches or 24 inches 

• Adjustable:

  • Bendable: The probe can be bent within the first 3–5 inches above the mounting base (marked by a black line) 

  • Cuttable to Length: If shortened, the probe requires additional calibration steps 

Calibration Notes

• If the sender is used at full, uncut length: proceed directly to fuel level calibration in the EFIS—no Empty/Full calibration required. 

• If the sender is cut shorter: you must perform a calibration in two stages before EFIS calibration:

  1. Set EMPTY calibration by applying power with the signal line shorted to ground, wait ~10 seconds (for post‑March 2013 models), then measure a stable 0.3 V output.

  2. Set FULL calibration by fully immersing the sender in a tank, repeat with jumper, wait ~20 seconds, confirm ~4.0 V output.

• Once sender-level calibration is complete, proceed with the standard fuel‑level calibration in your EFIS system. 

Installation & Compatibility

• Wiring:

  • Red wire = +11–28 Vdc supply

  • Yellow wire = signal output (0.3 V to 4.0 V)

  • Black wire = ground 

• Compatible with many MGL EFIS and RADAC systems such as the Extreme EMS (signal interpreted in either ohms or voltage mode depending on RADAC switch setting) 

• No mechanical floats—ideal for rugged aviation installations and less prone to mechanical failure.

Mechanical & Environmental

• Probe body: concentric tubing (metal inner/outer with polyester or polymer insulators) 

• Housing dimensions: approximately 0.72″ tall and 2.625″ diameter 

• Materials: corrosion resistant, epoxy‑sealed electronics for durability across a wide temperature range (approx. −40 °C to +85 °C)