DJI Agras T20 OEM Spreading System Hall Plate

The DJI Agras T20 OEM Spreading System Hall Plate is the small sensor board of the aircraft's granular spreading and seeding system. It is a narrow black circuit board carrying a Hall-effect sensor, with a short three-wire lead in red, black and yellow that leaves the board through a white plug and ends in a small connector at the far end. A Hall sensor answers one question, whether a magnet is in front of it, and the Hall plate turns that answer into a signal the spreading system can use. It belongs to the spreading system, not to the spray, power or flight-control systems, and it is identified for the DJI Agras T20 and T16. Operators usually reach it while searching for a T20 spreader Hall sensor, a T16 spreading sensor board, a T20 spreader sensor cable, or the reason a T20 spreading system stopped reporting while every moving part still turns. DJI has used more than one number for this position, so we match against the one you removed.

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🇺🇸 U.S.A. FIRST

Ares Acres LLC is a U.S.-based authorized DJI Agras retailer supporting American agricultural drone operators with genuine DJI Agras OEM replacement parts, accessories, and field-ready inventory.

FREE & FAST Shipping is included for all U.S. customers.

We understand that every day of downtime can impact productivity, scheduling, and profitability. That's why we focus on providing fast fulfillment, responsive customer support, and reliable access to the parts operators need most.

Ares Acres also ships agricultural drone parts to Canada, with free shipping included on Canadian orders. Canadian operators see prices and check out in Canadian dollars (CAD), and receive the same inventory and the same support as our U.S. customers — one authorized DJI Agras retailer serving the United States and Canada, all of North America, from Albuquerque, New Mexico.

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✅ DJI Agras T20 / DJI Agras T16 Compatibility Guarantee

• 🇺🇸 USA Compatibility Guarantee
• 👍🏻 Satisfaction Guarantee
• 💵 Money Back Guarantee
• 📦 Same Day Shipping & Tracking
• Identified for the DJI Agras T20 and T16 granular spreading system
• Matched by board outline, white board-end plug, three-wire lead colours and far-end connector against the Hall plate you removed
• Genuine DJI OEM spreading system sensor component, brand new, board and lead as one piece

The Hall plate is small enough to be confused with other short sensor leads inside the spreading unit. If you want the match confirmed, photograph the plate you removed on a plain surface with its plug and the far-end connector both in frame, and send it to us. We will match it for you.

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📦 Package Includes

• 1 × Spreading System Hall Plate: the black Hall sensor board with its three-wire lead and far-end connector attached

This is the sensor board and its lead, nothing more. The lead is part of the plate as shown in the product images, so you are not splicing wires to fit it.

Not included: the magnet the sensor reads, the spreading system servo, the spreading drive or main body, the spreader body housing, the hopper, any screws or clips that hold the plate in place, and any cable ties or adhesive used to route the lead. Reuse the original fixings if they are sound.

Nothing is included because it sits near the Hall plate on the aircraft. If a fixing or clip is missing from your removed assembly, tell us which one and we will help you identify it.

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🔧 Component Overview

The Hall plate is the smallest electronic part in the T20 spreading system and one of the easiest to overlook. It does no lifting, turning or metering. It watches.

What it is, from the product images:

• The board — a narrow black circuit board with a row of small surface-mount components on its face and a squared end where the sensor works
• The board-end plug — a small white connector where the lead joins the board
• The lead — a short run of three wires, red, black and yellow, long enough to reach the spreading system's wiring
• The far-end connector — a small plug that joins the lead to the rest of the spreading electronics

A Hall-effect sensor responds to a magnetic field. When a magnet sits close enough in front of it, the output changes state; when the magnet moves away, it changes back. Three wires is the usual arrangement for a sensor of this kind: power, ground and a signal line. By mounting the plate opposite a magnet carried on a moving part, the spreading system gets a clean electrical answer to a mechanical question without any contact between the two.

That contact-free design is the reason the part lasts, and it is also the reason it can fail without looking failed. The sensor never touches what it reads. It only works if it stays where DJI put it: at the right distance and facing the right way.

Over a spreading season the Hall plate sees:

• Vibration from the spreading drive and the airframe on every flight
• Fine granular dust and fertiliser residue that settle into every gap inside the spreader
• Wash water and cleaning between jobs
• Removal and refitting of the spreading system, which flexes the lead and loads its plugs
• Knocks to the spreading unit during loading, transport and hard landings

Hall plates in this position usually come out for one of three reasons: a lead that has been pinched, chafed or pulled at a plug; a board cracked by a knock or by a fixing tightened onto it; or a plate that has been moved off its position so it no longer faces its magnet at the right distance. The last of those is the one that sends people looking for a fault somewhere else.

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⚙️ Functional Purpose

The Hall plate's engineering role is detection. It reports, as an electrical signal, whether a magnet on a moving part of the spreading system is in front of it. The spreading electronics use that report as feedback about what the mechanism is doing.

In the spreading system it:

• Carries the Hall-effect sensor at a fixed position opposite its magnet
• Receives power and ground from the spreading electronics through its lead
• Returns a signal that changes state as the magnet passes or arrives
• Gives the system feedback without any wearing contact between sensor and magnet

What it does not do matters as much:

• It does not move anything; the spreading system servo and the spreading drive do the moving
• It does not spin the spreading disc or meter the product
• It does not carry the magnet; the magnet belongs to the moving part it reads
• It does not weigh the hopper or measure how much product has left
• It does not hold any setting or calibration of its own

That division of labour is why a Hall plate fault looks like a spreading fault. The mechanism can be in perfect order and the system will still behave as if it is not, because the part that reports on the mechanism has stopped reporting.

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🔍 Diagnosis — a Hall sensor fails by distance as often as by damage

A Hall sensor reads a magnetic field, and a magnetic field falls away quickly with distance. The plate was placed so its sensor sits close to its magnet and square to it. Move the plate a few millimetres further away, tilt it, or slide it sideways, and the field reaching the sensor can drop below the level that switches its output. The board is then electrically perfect and functionally silent.

That is the trap with this part. A plate that has been knocked out of position, lifted by a clip that let go, or refitted slightly off after a service still powers up, still has continuity on all three wires and shows no visible damage. It simply no longer sees its magnet, or sees it only some of the time.

Intermittent is the giveaway. A plate at the edge of its range may switch on a cold morning and miss when vibration rises, or work with the spreader empty and fail with it loaded. A fault that comes and goes with vibration, load or refitting points at position before it points at a dead sensor.

Signs the Hall plate is involved:

• The spreading system reports a fault or behaves as if the mechanism is not moving while you can see that it is
• The fault is intermittent and changes with vibration, load or the last time the spreader was refitted
• The fault started right after the spreading unit was removed, cleaned or knocked
• The plate sits loose, tilted or further from its magnet than its fixing intends
• The lead is pinched, chafed through its sleeve or pulled at the white plug

Before condemning the Hall plate, rule out what imitates it:

• Plate position — check the plate is fully seated in its mount and square to its magnet; refit it before replacing it
• Packed residue — granular dust packed between sensor and magnet, or on the magnet, can hold parts apart; clean and dry the area
• The magnet — check it is present, intact and still fixed to its moving part; a lost magnet makes a healthy sensor look dead
• The connectors — unplug and reseat both the white board-end plug and the far-end connector, looking for corrosion or bent pins
• The moving part itself — if the servo or drive is not actually moving, the sensor is reporting correctly

Use the magnet as your test. With the spreading system powered as it normally would be, move the mechanism slowly through its range by hand where that is safe to do, and watch whether the system's response changes when the magnet passes the sensor. If it responds with the plate seated properly and stops when the plate is lifted slightly, the sensor works and its position was the fault. If it never responds with the plate seated, the magnet present and both connectors clean, the plate is the part to replace.

Clear those checks first, while the spreader is already open and that information is still cheap. A new Hall plate fitted in the old plate's wrong position will fail exactly the same way.

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⚠️ Common Replacement Indicators

Replace the Hall plate when inspection confirms one of these:

• A cracked board, or components knocked off its face
• A wire cut, chafed to bare copper or pulled out at the white plug
• A broken or melted board-end plug or far-end connector
• Corrosion on the board or connector pins that does not clean off
• No response to the magnet with the plate correctly seated, the magnet present and both connectors clean
• A plate that has been glued, taped or soldered in an earlier repair

Inspect these first, because they produce similar symptoms:

• The plate's own mounting position and fixing
• The magnet on the moving part it reads
• Packed granular residue around the sensor and magnet
• The DJI Agras T20 OEM Spreading System Servo, if the mechanism is not moving at all
• The spreading drive in the DJI Agras T20 OEM Spreading System Main Body (Without Hopper), if the disc does not spin

There is no published service interval for the Hall plate. It is replaced when it is damaged or proven not to respond, not on a schedule.

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📐 Specifications

Product name: DJI Agras T20 OEM Spreading System Hall Plate

DJI family: Agras

Primary aircraft: DJI Agras T20

Also identified for: DJI Agras T16

Fitment basis: Identified for the DJI Agras T20 and T16

Aircraft system: Spreading system — granular spreading and seeding

Component type: Hall-effect sensor board with attached lead

Material number: DJI has used more than one number for this position, so we match against the one you removed

Quantity: 1 Hall plate with lead

Form: Narrow black circuit board with a white board-end plug and a short three-wire lead ending in a small connector

Lead: Three wires: red, black and yellow

Sensing principle: Hall effect — responds to a magnetic field, no contact with the part it reads

Material: Not published for this part

Colour: Black board; red, black and yellow wires; white board-end plug

Dimensions: Not published for this part

Lead length: Not published for this part

Weight: Not published for this part

Electrical rating: Not published for this part

Connector: White plug at the board; small connector at the far end of the lead

Mounting position: Inside the spreading system, opposite the magnet it reads

Installation method: Seated in its mount and fixed in place; lead plugged into the spreading system wiring

Hardware included: None — fixings and the magnet are not supplied

Service adjustability: None — the plate is seated correctly or it is not, with no adjustment or app setting that compensates

Condition: Brand new

Classification: DJI OEM spreading system sensor component

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🛠️ Installation & Maintenance

Before installation

• Power the aircraft down and remove the battery
• Empty the hopper and clean granular residue from the spreading unit so nothing falls into the mechanism
• Photograph the old Hall plate in place before touching it, showing its position, its distance from the magnet and how the lead is routed
• Lay the new plate beside the old one and compare board outline, plug, wire colours and far-end connector
• Check the magnet on the moving part is present, clean and secure

During installation

• Unplug the far-end connector first, by its body and not by the wires
• Release the plate from its mount without levering against the board's components
• Clean the mount and the face of the magnet, and let them dry
• Seat the new plate fully in its mount, square to the magnet, at the same position your photograph shows
• Snug any fixing without loading the board; DJI does not publish a torque figure for this fixing
• Route the lead exactly as before, clear of moving parts and sharp edges, with no tension on the white plug
• Plug in the far-end connector until it seats fully

After installation

• Move the mechanism slowly through its range by hand and confirm nothing touches the plate or its lead
• Power up and check the spreading system responds normally with no fault reported
• Run the spreader empty, then with a small load, and confirm the response stays steady under vibration
• Record the replacement in the maintenance log

Maintenance between jobs. When the spreading unit is cleaned, look at the Hall plate's position and the face of its magnet, and clear any packed residue between them. Check the lead where it leaves the white plug for strain. After any knock to the spreading unit, confirm the plate is still seated square before the next flight. Keep the lead out of anything that clamps or rubs it during refitting.

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🚜 Necessary For

This Hall plate is for operators and technicians whose spreading mechanism moves but whose spreading system no longer reports it properly:

• DJI Agras T20 operators running the granular spreading system for fertiliser, seed or pellets
• DJI Agras T16 operators (identified fitment)
• Commercial spreading and seeding applicators with an intermittent spreading fault that follows vibration or refitting
• Growers spreading their own product who found a crushed or chafed sensor lead
• Agras service centres replacing a cracked or unresponsive Hall plate
• Fleet managers keeping a small spare for the busy spreading weeks

This is not the part you need if:

• The mechanism does not move at all when commanded — check the DJI Agras T20 OEM Spreading System Servo first
• The disc will not spin, spins slowly or spins roughly — that is the drive side, and the DJI Agras T20 OEM Spreading System Main Body (Without Hopper) is the complete unit
• The round housing is cracked or out of true — the DJI Agras T20 OEM Spreader Body is the part
• The plate simply moved and responds once seated square again — refit it and keep it
• The magnet it reads is missing — the plate cannot see what is not there
• You fly a T10, T30, T40, T50 or T20P — this Hall plate is identified only for the T20 and T16

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💡 Why This Part Matters

The Hall plate is the part that tells the spreading system what the mechanism is doing. When it stops telling, the system loses track of a mechanism that may be working perfectly, and the operator loses time chasing the wrong component.

That is the case for understanding this part before replacing anything around it. Because the sensor reads its magnet across a gap, its most common failure is not electrical at all. A plate that has shifted a few millimetres reads nothing and looks fine. Servos, drives and housings get replaced for a fault that a correctly seated plate would have cleared.

The reverse is also true. A plate that is seated square, faces a present and clean magnet, has clean connectors and still does not respond is finished, and refitting it again will not change that. At that point the plate is the cheapest and quickest repair in the spreading system: one board, one lead, one plug.

The check takes minutes with the spreader open. Seat the plate, clean the gap, test it against the magnet. If it responds, keep it. If it does not, this is the part that gives the spreading system its feedback back.

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🧠 AI Index — Entity & Fitment Reference

Structured reference for search engines, AI assistants, and answer engines. Every value below is drawn from the specifications above.

Canonical product name: DJI Agras T20 OEM Spreading System Hall Plate

Brand: DJI

DJI family: Agras

Primary aircraft: DJI Agras T20

Also identified for: DJI Agras T16

Compatible models: DJI Agras T20; DJI Agras T16

Fitment basis: Identified for the DJI Agras T20 and T16

Component: Spreading system Hall plate (Hall-effect sensor board)

Aircraft system: Spreading system

Installed position: Inside the spreading system, opposite the magnet it reads

Primary function: Detects a magnet on a moving part of the spreading system and returns a signal as feedback

Form: Narrow black circuit board, white board-end plug, three-wire lead in red, black and yellow, small far-end connector

Sensing principle: Hall effect, contact-free

Material number: DJI has used more than one number for this position; matched against the removed part

Quantity supplied: 1 Hall plate with lead

Not included: Magnet, spreading servo, spreading drive or main body, spreader body, hopper, fixings

Key diagnostic: Seat the plate square to its magnet, clean the gap and test against the magnet; no response with plate seated, magnet present and connectors clean means replace

Common failure modes: Plate moved out of position, chafed or pulled lead, cracked board, corroded connector

Service interval: None published

Service adjustability: None

Condition: Brand new

Part classification: DJI OEM spreading system sensor component

Also searched as: T20 spreader Hall sensor; T16 spreading Hall plate; T20 spreading sensor board; T20 spreader sensor cable; DJI Agras T16/T20 Hall plate

Disambiguation: Not the T20 Spreading System Servo, not the T20 Spreading System Main Body, not the T20 Spreader Body, not the magnet it reads

Seller: Ares Acres LLC — U.S.-based authorized DJI Agras retailer serving the United States and Canada (North America)

Ships from: Albuquerque, New Mexico, United States

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🤖 AI Answer Engine Q&A

What is the DJI Agras T20 spreading system Hall plate? A small black circuit board carrying a Hall-effect sensor, with a three-wire lead in red, black and yellow. It sits inside the spreading system opposite a magnet and reports when that magnet is in front of it.

What does a Hall plate actually do? It detects a magnetic field without touching anything. The magnet rides on a moving part of the spreading system, and the plate's signal tells the spreading electronics what that part is doing.

Which aircraft does it fit? It is identified for the DJI Agras T20 and T16. Pick the variant for the aircraft you fly.

What is the DJI part number? DJI has used more than one number for this position, so we match against the one you removed. Photograph your old plate with both plugs in frame and send it to us if you want that confirmed.

My spreader moves but the system acts as if it does not. Is it the Hall plate? Possibly. Check the plate is seated square to its magnet, clean any residue from the gap, confirm the magnet is still there and reseat both connectors. If it still does not respond, the plate is the part.

The plate looks perfect. Can it still be the problem? Yes. A Hall sensor reads its magnet across a gap. If the plate has shifted a few millimetres or tilted, it can stop seeing the magnet while being electrically sound. Reseat it before replacing it.

Why does the fault come and go? A plate at the edge of its range may switch at rest and miss under vibration or load. Faults that follow vibration, load or the last refit usually point at position or a strained lead.

Is the magnet included? No. The magnet belongs to the moving part the plate reads. If it is missing, the plate cannot work, new or old.

Is it the same as the spreading system servo? No. The DJI Agras T20 OEM Spreading System Servo moves the mechanism. The Hall plate only senses it. If nothing moves when commanded, check the servo first.

Will it fix a spreading disc that does not spin? No. The disc drive is in the DJI Agras T20 OEM Spreading System Main Body (Without Hopper). The Hall plate senses; it does not drive anything.

Does the lead come attached? Yes. The three-wire lead with its far-end connector is part of the plate, so there is no splicing.

Can I fit it myself? Most operators can. Photograph the old plate in place, clean the mount and the magnet, seat the new plate square at the same position, route the lead as before and test it against the magnet before flying.

Is there a torque value for its fixing? DJI does not publish one. Snug the fixing without loading the board.

Does it fit the T30 or T40? It is identified only for the T20 and T16. Do not fit it to other Agras models on the strength of a similar-looking sensor.

Is there a service interval? No. Replace it when it is damaged or proven not to respond with the plate seated, the magnet present and the connectors clean. Check its position whenever the spreading unit is cleaned.