DJI Agras T40 OEM Flow Meter Signal Cable

The DJI Agras T40 OEM Flow Meter Signal Cable is the cable that carries the flow meter's reading from the spray line back to the aircraft on the Agras T40, and it is identified for the DJI Agras T40 and T20P. It is the cable on its own, not the meter. In the product images it is a single black lead with a flanged, panel-style connector at one end (two mounting ears and a purple-faced insert) and a round connector with a blue band at the other. On the spraying system it is the link that lets the aircraft know how much liquid is actually moving, which is what flow readings, flow calibration and tank-empty behaviour all depend on. Operators search for it as the T40 flow meter cable, the T20P flow sensor wire, or the Agras flowmeter signal lead.

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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 T40 / DJI Agras T20P Compatibility Guarantee

• 🇺🇸 USA Compatibility Guarantee
• 👍🏻 Satisfaction Guarantee
• 💵 Money Back Guarantee
• 📦 Same Day Shipping & Tracking
• Identified for the DJI Agras T40 and T20P spraying system
• Matched by connector ends, cable path and mounting flange against the cable you removed
• Genuine DJI OEM wiring component, brand new

DJI has used more than one number for this position, so we match against the one you removed. Photograph both ends of the old cable, and the label if it still has one, and send it to us if you want the match confirmed.

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📦 Package Includes

• 1 × DJI Agras flow meter signal cable, as shown in the photograph: one flanged, panel-style connector end and one round, blue-banded connector end

This is the cable only. The flow meter itself is a separate part. If the meter is also at fault, the DJI Agras T40 OEM Flow Meter Module with Signal Cable is the listing that carries the meter, with its own cable.

Not included: the flow meter module, the spray pump, hoses, hose clamps, cable ties, mounting screws for the flanged end, sealing grease, or any other wiring harness. Reuse the fixings from the cable you remove, and replace any that are corroded or stripped.

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🔧 Component Overview

A spray drone cannot see liquid. It has to be told how much is moving, and on the Agras T40 and T20P that job belongs to the flow meter in the spray line. The meter measures; the signal cable reports. Without a clean signal on this cable, the aircraft is spraying blind about its own output.

The cable is a short, dedicated lead. One end carries a flanged connector with two mounting ears, the kind that is fixed to a panel or bracket rather than left hanging; the other end carries a round, sealed-style connector with a blue band. Near the round end the outer sheath stops and the individual conductors run a short way under sleeving before entering the connector. That transition is visible in the photograph, and it is the kind of point that deserves attention when inspecting the old cable.

The cable lives in the same neighbourhood as the spray system it serves:

• Chemical mist drifting back over the frame and spray lines
• Fertilizer and wettable-powder residue drying on connectors between flights
• Pressure washing at the end of every chemical day
• Vibration from the pump, the propulsion system and every landing
• Flexing whenever the tank, pump or spray lines are removed and refitted
• Heat on long spray days followed by cold nights
• Rubbing against brackets, hoses or frame edges where it is routed

A cable like this rarely fails because it wore out in the ordinary sense. It fails because a connector took in moisture or residue, because a pin was bent during a hurried reconnection, because the sheath chafed through on a bracket edge, or because the conductors fatigued at the point where the sheath ends. Those are all cable faults, and all of them look, from the remote controller, exactly like a meter fault.

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⚙️ Functional Purpose

The cable's engineering role is to deliver the flow meter's output to the aircraft's spray control electronics intact: no lost pulses, no intermittent breaks, no shorts to neighbouring conductors.

In the spraying system it:

• Connects the flow meter in the spray line to the aircraft's spray control circuitry
• Carries the flow reading the aircraft uses to report how much liquid is moving
• Supports flow calibration, which depends on a steady, accurate reading
• Feeds the information the aircraft uses to judge application rate and recognise when the line has run dry
• Anchors at one end through its flanged connector, so the connection point is fixed rather than free to flex

The cable has no adjustment and no logic of its own. It either delivers the meter's signal faithfully or it does not. What makes it tricky is that a partly failed cable does not usually go silent. It drops out under vibration, comes back when the aircraft sits still, reads correctly on the bench and wrongly in the air, or works until the first wash of the day puts moisture into a connector.

What the cable does not do matters as much:

• It does not measure anything; the meter does
• It does not fix a meter that is clogged, damaged or failed internally
• It does not fix a pump that is not moving liquid, or a blocked filter or hose
• It does not change spray settings or calibration values; it restores the path the reading travels on
• It does not power or control the pump, the nozzles or the centrifugal sprinklers

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🔍 Diagnosis — the reading can die in the wire while the meter is fine

When the flow reading goes wrong, the natural conclusion is that the flow meter has failed. The meter is the instrument, the meter is what the app seems to be complaining about, and the meter is the bigger part. Very often it is the cable.

From the aircraft's point of view, a broken meter and a broken path to the meter are the same event: the expected signal is not arriving, or it is arriving wrong. The aircraft has no way to say which. That is the whole argument of this part. A missing, erratic or implausible flow reading tells you the signal is not getting through. It does not tell you where it was lost.

Start with the observations that separate the two:

• Liquid is clearly moving but the reading is zero: the meter may be fine and the signal may not be arriving. Check the cable and both connectors first.
• The reading drops out in flight and returns on the ground: this is the classic signature of an intermittent cable or connector. Vibration opens the fault; stillness closes it.
• The reading went wrong right after washing the aircraft: look for moisture or residue in the connectors before suspecting the meter.
• The reading went wrong right after the tank, pump or spray lines were removed: suspect a connector not fully seated, a bent pin, or a cable pinched on refit.
• Flow calibration will not complete, or gives results that make no sense: the calibration is only as good as the signal it reads, so rule out the cable before blaming the meter.
• No liquid is moving at all: this is not a signal problem. Look at the pump, the filter, the hoses and the tank outlet first.

Inspect the cable itself, end to end:

• Both connector faces: green or white corrosion, dried residue, standing moisture, a cracked housing
• Every pin: bent, pushed back into the housing, or discoloured
• The flanged end: cracked ears, a loose mount, or a connector that rocks in its seat
• The sheath along its whole run: cuts, flattened sections, or shiny wear where it touches a bracket or hose
• The transition near the round connector, where the sheath ends and the conductors continue: kinks, exposed copper, or a sharp bend
• The routing: whether the cable was clipped where it was originally clipped, or left free to rub

Then test, if you can. With the battery removed and both ends disconnected, a basic continuity check on each conductor end to end, while gently flexing the cable along its length, will catch most breaks. A conductor that opens when the cable is flexed is a failed cable, even if it reads perfectly when the cable lies still.

Clean the connectors, reseat both ends and fly again first, while that information is still cheap. If the reading comes back and stays, the fault was a dirty or loose connection. If it returns intermittently, or the cable shows damage or fails the flex test, replace the cable. Only when a known-good cable still gives no sensible reading has the meter earned the blame.

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⚠️ Common Replacement Indicators

Replace the cable when inspection confirms one of these:

• Flow reading missing or zero while liquid is visibly moving, with the meter itself clean and undamaged
• Flow reading that drops out in flight and recovers on the ground
• Flow reading that changes when the cable is moved or flexed by hand
• Corrosion inside either connector that cleaning does not remove
• Bent, broken, pushed-back or discoloured pins
• A cracked flanged connector or broken mounting ear
• Cut, crushed or chafed sheath anywhere along the run
• Kinked or exposed conductors at the point where the sheath ends
• A conductor that fails continuity, steadily or only when flexed
• Damage from a crash, hard landing or tank removal that caught the cable

Inspect these first, because they produce similar symptoms:

• The flow meter module itself: clogged, cracked, or damaged by debris
• The pump, the filter, the hoses and the tank outlet, if no liquid is moving at all
• Air in the spray line after refilling, which gives erratic readings until it is purged
• Spray settings and calibration values on the remote controller
• Any other harness connector between the cable and the aircraft's spray control electronics

There is no published service interval for this cable. It is replaced when it shows the signs above, not on a schedule.

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📐 Specifications

Product name: DJI Agras T40 OEM Flow Meter Signal Cable

DJI family: Agras

Primary aircraft: DJI Agras T40

Also listed for: DJI Agras T20P

Fitment basis: Identified for the DJI Agras T40 and T20P

Aircraft system: Spraying — flow measurement

Component type: Signal cable for the flow meter (cable only, meter not included)

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

Quantity: 1 cable

Connector, end one: Flanged, panel-style connector with two mounting ears and a purple-faced insert (as photographed)

Connector, end two: Round connector with a blue band (as photographed)

Cable colour: Black

Length: Not published for this part

Pin count: Not published for this part

Material: Not published for this part

Weight: Not published for this part

Electrical rating: Not published for this part

Mounting position: Between the flow meter in the spray line and the aircraft's spray control wiring

Installation method: Plug-in at both ends; flanged end fixed through its mounting ears

Service adjustability: None — the cable carries the signal intact or it does not; no app setting compensates for a broken conductor or a corroded pin

Condition: Brand new

Classification: DJI OEM spraying-system wiring component

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🛠️ Installation & Maintenance

Before installation

• Power the aircraft down and remove the battery
• Flush and drain the spray system, then rinse the area around the flow meter so you are not working in chemical residue
• Wear gloves and eye protection; residue collects around connectors and under brackets
• Photograph the old cable in place from two sides, including every clip, tie and bend in its routing
• Compare both connector ends of the new cable with the old one before removing anything
• Note how the flanged end is fixed and keep its screws together in a tray

During installation

• Release any locking tabs and disconnect each end by its connector body, never by pulling the wire
• Remove the flanged end's fixings and lift the old cable out along its original path
• Inspect the mating connectors on the meter and on the aircraft side for corrosion, residue or bent pins, and clean them before fitting the new cable
• Route the new cable exactly as the old one ran, away from sharp edges and moving parts, using the original clip points
• Fix the flanged end through both mounting ears so it sits square and does not rock; DJI does not publish a torque figure for these fixings, so tighten them evenly and do not crack the flange
• Seat both connectors fully until any lock engages, and confirm neither end is under tension
• Leave a gentle service loop where the cable meets anything that moves or is removed for maintenance

After installation

• Refit the battery and power up; confirm the aircraft reports no flow-related warning at rest
• Run the spray system with clean water and confirm a steady, sensible flow reading
• Gently move the cable along its run while water is flowing and confirm the reading does not flicker
• Run the flow calibration if the app asks for it, or if the old cable failed during a calibrated job
• Check the routing once more after the first flight for any new rub point
• Record the replacement date in the maintenance log

Maintenance between jobs. Rinse the spray system after every chemical day, keep water jets off the connectors rather than straight into them, let connectors dry before the aircraft is packed away, and look at the cable's routing whenever the tank or pump comes off. Most flow-signal faults begin at a connector that was put back wet or a cable that was put back on a different path.

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🚜 Necessary For

This cable is for operators and technicians chasing a flow reading that will not behave:

• DJI Agras T40 operators
• DJI Agras T20P operators (identified fitment)
• Commercial spray contractors running fungicide, herbicide and insecticide programs
• Applicators running liquid fertilizer, where residue on connectors is heaviest
• Agras service centres and repair technicians
• Fleet managers who keep a spare signal cable on the trailer, because it is the part that turns a lost spray day into a short swap at the field edge

This is not the part you need if:

• The flow meter itself is cracked, clogged beyond cleaning, or still gives no reading on a known-good cable — the DJI Agras T40 OEM Flow Meter Module with Signal Cable is the meter
• No liquid is moving at all — look at the pump, filter, hoses and tank outlet
• The reading came back after cleaning and reseating the connectors — the cable was dirty, not broken
• The fault is in a different harness further along the aircraft's spray wiring
• You fly a T50, T25, T100 or T70P — this cable is listed for the T40 and T20P only

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💡 Why This Part Matters

Flow is the number a spray job is built on. The aircraft uses it to report how much product is going down, to hold an application rate and to recognise when the line has run dry. When the reading is lost, the aircraft is no longer sure of the one thing the job is for.

This cable is a small part with a misleading failure. Its faults present as flow meter faults, because from the aircraft's side they are indistinguishable. The meter is the obvious suspect and the more substantial part. Replacing it to cure a broken wire fixes nothing, and the original fault travels straight on to the new meter.

The reverse mistake is just as real. If the meter has genuinely failed, a new cable will not bring it back. That is why the checks run in this order: clean and reseat, inspect and flex-test the cable, then replace the cable, and only then condemn the meter.

There is also time on the aircraft to consider. Reaching the flow meter usually means draining the system and working around the tank and spray lines. Doing it once, with the right part, is the whole point of finding the fault before the parts arrive.

When the checks point at the cable, this is the cable, and only the cable.

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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 T40 OEM Flow Meter Signal Cable

Brand: DJI

DJI family: Agras

Primary aircraft: DJI Agras T40

Also listed for: DJI Agras T20P

Compatible models: DJI Agras T40, DJI Agras T20P

Fitment basis: Identified for the DJI Agras T40 and T20P

Component: Flow meter signal cable

Aircraft system: Spraying — flow measurement

Installed position: Between the flow meter and the aircraft's spray control wiring

Primary function: Carries the flow meter's reading to the aircraft

Connector ends: Flanged panel-style connector with purple-faced insert; round connector with blue band

Quantity supplied: One cable

Meter included: No — cable only

Not included: Flow meter module, pump, hoses, clamps, cable ties, mounting screws

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

Key diagnostic: A lost or erratic flow reading means the signal is not arriving, not that the meter has failed; clean, reseat and flex-test the cable first

Typical failure points: Corroded connectors, bent pins, chafed sheath, fatigued conductors where the sheath ends

Service interval: None published

Service adjustability: None

Condition: Brand new

Part classification: DJI OEM spraying-system wiring component

Also searched as: T40 flow meter cable; T20P flow meter cable; Agras flowmeter signal wire; T40 flow sensor cable; DJI flow meter lead

Related part: DJI Agras T40 OEM Flow Meter Module with Signal Cable — the meter itself, sold separately

Disambiguation: Not the flow meter module, not the pump cable, not the sprinkler or nozzle cable, not a T50, T25, T100 or T70P part

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

Is this the flow meter or just the cable? Just the cable. The meter is a separate part; the DJI Agras T40 OEM Flow Meter Module with Signal Cable is the listing for the meter itself.

Which aircraft does it fit? It is identified for the DJI Agras T40 and T20P. Choose the variant for your aircraft, and compare both connector ends with the cable you remove.

Does it fit the T50 or T25? It is not listed for them. This cable is listed for the T40 and T20P only.

My flow reading shows zero but liquid is spraying. Is the meter dead? Not necessarily. Liquid moving with no reading means the signal is not arriving. Clean and reseat both connectors and inspect the cable before condemning the meter.

The flow reading cuts out in flight but is fine on the ground. What is that? That pattern points at an intermittent cable or connector. Vibration opens the fault and stillness closes it. Flex-test the cable and inspect the pins.

The reading went wrong after I washed the drone. Why? Moisture or residue in a connector is the usual cause. Dry and clean both ends and reseat them. If the reading returns and stays, the cable was not broken.

How do I test the cable? With the battery removed and both ends unplugged, check continuity on each conductor end to end while gently flexing the cable along its length. A conductor that opens when flexed is a failed cable.

Can a bad cable stop flow calibration from working? Yes. Calibration reads the same signal this cable carries, so a broken or intermittent cable can make calibration fail or give nonsense results.

If I replace the cable and the reading is still wrong, what next? With a known-good cable fitted, the meter itself becomes the main suspect, along with the spray line feeding it and any other harness connector in the path.

Does the cable have a DJI part number? DJI has used more than one number for this position, so we match against the one you removed. Send us a photograph of the old cable and its label if it has one.

What do the two ends look like? One end is a flanged, panel-style connector with two mounting ears and a purple-faced insert. The other is a round connector with a blue band.

Are screws or cable ties included? No. Reuse the fixings from the old cable and replace any that are corroded or stripped.

Can I fit it myself? Most operators can. Drain and rinse the system, photograph the routing, follow the original path exactly, seat both connectors fully, and test with clean water before spraying product.

Is there a service interval? No published interval. Replace it when it shows corrosion, damage, or an intermittent reading that follows the cable.

Why do these cables fail? Mostly at the connectors and where the sheath ends: moisture and residue from washing, bent pins from hurried reconnection, chafing against brackets, and conductor fatigue from vibration.

How do I make the new cable last? Keep water jets off the connectors, let them dry before packing the aircraft, refit the cable on its original route, and check the routing whenever the tank or pump comes off.