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A small radar mounting angle error can move the centre of the measurement path a substantial distance in a tall silo. Checking the flange with a spirit level is not enough unless the required beam direction has already been defined. The intended target may not be vertically below the nozzle.
Calculate displacement separately from beam width
For a target plane a vertical distance H below the antenna, a tilt angle theta from vertical displaces the beam axis by H x tan(theta). In a hypothetical installation with H = 20 m and theta = 2 degrees, the displacement is approximately 0.70 m. This is a geometric example, not an allowable installation tolerance.
Beam width is a different quantity. The METRAVON MV-RD21 lists a nominal 3-degree beam. Its approximate width at a selected distance can help identify nearby obstructions, but the nominal beam outline is not a hard boundary beyond which reflectors have no effect.
Review the radar mounting angle at several levels
Plot the axis through the expected high, intermediate and low surfaces. A path that clears a brace at high level can approach a wall or strike the filling stream farther down. Bulk material also changes shape as it fills and discharges, so one empty-silo projection does not define the entire duty.
| Drawing input | What it changes |
|---|---|
| Roof slope | The flange normal may differ from the required beam direction. |
| Target distance | The lateral displacement produced by a given angular difference. |
| Internal structure | Where the axis and surrounding beam can encounter stationary reflectors. |
| Material profile | The reflecting surface during filling, storage and extraction. |
Specify a support that holds the selected direction
Document the approved orientation using a drawing reference that an installer can reproduce. Check available adjustment and locking arrangements, access for setting them, and whether the support moves under vibration or service loads. Do not prescribe a bolt torque from a generic article; use the instructions for the actual mounting hardware.
After tightening, verify the orientation again. If the radar must be removed for cleaning, provide a repeatable mounting reference so it can be returned to the same direction. A paint mark can help identify movement but does not replace a dimensional inspection where one is required.
Q1. Should a solids radar always point vertically down?
Not necessarily. The required direction depends on the silo geometry, inlet and material surface. Obtain an application review rather than treating either vertical or tilted mounting as universally correct.
Q2. Can the instrument offset compensate for a wrong angle?
An offset changes a reported distance; it cannot move the beam away from a wall or make it observe another part of the surface. Correct the physical measurement path before calibrating its reference.
Q3. Is the 0.70 m example a recommended clearance?
No. It only illustrates displacement from the stated geometry. Required clearance and acceptable orientation need assessment for the real antenna, obstructions and process.
Summary
Specify where the beam must travel, then determine how to hold that direction. Send a silo section with distances and proposed mounting angle for an MV-RD21 installation review.
