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Centaur Arrow Installation Instructions

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This document explains how to install the Centaur Arrow sensor in a grain bin for CO2, temperature, and humidity monitoring.

Before You Start

  • Make sure your gateway turned on (See: Gateway Setup Guide.)
  • Inspect the gateways LED lights, no red light should be lit.
  • PPE & safety: Use appropriate fall protection/PPE when working at height. Confirm the area is safe to drill and avoid electrical lines or hidden services.

What’s in the Box

  • Arrow sensor (pre-assembled)
  • **Mounting bracket
  • Two black plastic adapters (contoured to the corrugated wall)
  • Expansion rivets (x2)

Tools Required

  • Rivnut: 5/16″ diameter
  • Cordless drill with step bit or drill bit: If you are using a drill bit use 3/4”, if you have access to a step bit you may go up to 13/16″ diameter
  • Sealant: silicone suitable for metal (similar to sink sealant, but rated for outdoor/metal use)
  • Permanent Marker to mark drill points

Mounting Notes

  • Mount the Mounting bracket horizontally so the sensor body sits flush to the bin.
  • The sensor should be mounted near the middle of the steel corrugated panel (don’t place across panel seam).

Sensor mounting holes

The Arrow requires three holes:

  1. Main sensing hole (3/4″) for the sensing tip to pass through the wall.
  2. Two rivet holes for fastening the mounting bracket to the bin.

Installation Steps

  1. Mark the center (main) hole. Choose a corrugation valley area.
  2. Drill the main hole (3/4″).
  3. Use the main hole as a reference.
    • Hold the mounting bracket in its horizontal orientation, align the sensing tip position with the main hole, and mark the two rivet holes.
  4. Drill the two rivet holes.
  5. Dry fit the stack-up.
    • Mounting bracket → black plastic adapters (they conform to corrugation) → bin wall (with main hole).
  6. Set the expansion rivets (x2).
    • Insert and tighten evenly, until snug so they expand and grip the wall cavity. Do not overtighten.
  7. Seal around the holes.
    • Apply a continuous bead of silicone sealant for metal, around the holes and then press the Mounting bracket in to position, preventing water ingress.
  8. Final seal check.
    • Wipe excess sealant, verify no visible gaps.

Power-On & Confirmation

  1. Ensure the gateway is online (see gateway guide).
  2. Turn the sensor ON: rotate the magnetic ring to the ON position, until the stop screw and the red circle are parallel.
    • An LED will blink green for a few seconds and the device will make a sound to confirm power-on.

Notes on Rivets

The supplied fasteners are expansion rivets. They are designed to expand and fill the wall cavity (similar in principle to drywall anchors) to create a secure hold on corrugated steel.

Questions or need help? Email support@centaur.ag and we’ll assist you.