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Holt Systems

Diesel tank monitoring: a text when 1,000 L goes missing

We fit a level sensor on each tank and a gateway at the shed. If the diesel drops overnight, your phone tells you within minutes.

  • WatchesTank level, bowser door, hatch
  • You getA text on a sudden drop
  • Sends byStarlink or 4G from the shed
Homestead fuel alerts
  1. 2:06 am

    Homestead tank lost 1,000 L in 12 min, now 8,990 L. Outside work hours. Check the tank.

  2. 2:21 am

    Homestead bowser door opened 2:04 am. Sent to all nominated people.

  3. 6:40 am

    Homestead tank steady at 8,985 L. Level report saved with time and volume.

Example alerts from this system

1,000 L

Siphoned into an IBC on a ute from a farm storage unit near Yelarbon, April 2026. Police told owners to check fuel levels regularly.

Source: Queensland Country Life

7,500 L

Allegedly pumped from a Moranbah mine over about five weeks in 2022.

Source: Queensland Country Life

68 days

Australia reportedly held 68 days of diesel in January 2022.

Source: Beef Central

Diesel tank monitoring starts with the night nobody's around

Without diesel tank monitoring, a theft shows up days or weeks later, when a dip comes up short or a machine won't start. By then there's no time of loss and nothing to give police.

Your tanks stand at the homestead, the workshop and the outstations. They're out of sight for days during musters, and grader, ute and generator draw is all over the place.

A padlock on the bowser handle won't stop a hose in the fill point or the outlet.

  • A dip or paper log only tells you something's gone, not when.
  • A dry tank stops the grader, the feed run and the muster.

The same night, with and without a text

Without monitoring

  1. 2:00 amSomeone siphons 1,000 L from the tank.
  2. 6:00 amThe tank looks fine from the house.
  3. Day 3A dip comes up short. Nobody knows when.
  4. Day 5You report it with no time and no volume.

With monitoring

  1. 2:00 amThe level drops 1,000 L in a few minutes.
  2. 2:05 amText to you and the manager.
  3. 6:00 amYou check the tank and the bowser door.
  4. 8:00 amPolice get the time and volume.

How diesel tank monitoring works at the homestead

Diesel tank monitoring at a station homestead Plan of a station homestead fuel precinct. A machinery shed carries a LoRaWAN gateway and a Starlink dish on its roof. A 10,000 L diesel tank with a level sensor on top sits beside a bowser, and a LoRaWAN link runs from the sensor to the gateway. Below the plan, a graph of tank level over one night from 10 pm to 6 am shows a flat line at 10,000 L, then a step drop of 1,000 L at about 2 am. An arrow leads from the drop to an SMS to the manager reporting the 1,000 L loss. Homestead fuel precinct Gateway and Starlink dish Machinery shed LoRaWAN Level sensor 10,000 L tank Bowser Alert path: sensor, gateway, Starlink, SMS Tank level overnight 10,000 L 9,000 L No draw, level flat 1,000 L lost in minutes 10 pm 2 am 6 am SMS SMS to manager, 2:06 am Tank 1 down 1,000 L in 6 minutes
Plan of a station homestead fuel precinct. A gateway and Starlink dish sit on the shed roof. A level sensor on top of the 10,000 L tank sends by LoRaWAN radio to the gateway. A graph shows a 1,000 L step drop at about 2 am from 10 pm to 6 am, with an SMS to the manager.
  1. 1

    A sensor on top of each tank

    A level sensor sits at the centre of the tank top, clear of the baffles and fill pipe. It reads every 5 to 15 minutes.

  2. 2

    Radio to the shed

    Each sensor sends by LoRaWAN (long range wide area network) radio to the gateway on the shed roof.

  3. 3

    Starlink or 4G carries the text

    The gateway sends out by Starlink or 4G, so the tank doesn't need phone coverage.

  4. 4

    A sudden drop is an alert

    The system compares each reading with normal draw. A step drop or an after hours drop texts the people on your list.

What we fit on the tanks and at the shed

  • Tank level sensor

    Reads the diesel level from the top of each tank. We calibrate it to a dip.

    Reads every 5 to 15 min

  • Bowser and hatch contact

    Tells you when the bowser cabinet or tank hatch is opened out of hours.

    Alerts on any open

  • Gateway on the shed

    Picks up every tank sensor by radio. We test signal at each tank first.

    Hourly health check

  • Starlink or 4G link

    Sends the text out from the shed where the phone signal is poor.

    Starlink or 4G

What lands on your phone when the diesel drops

Homestead 10,000 L tank, overnight

Dashboard view

Tank level
8,990 L
Last 30 min
-1,000 L
Bowser door
Closed
Sensor
Reporting
8985 9492.5 10000 Alert level 10 pm12 am2 am4 am6 am L
Example 10,000 L tank, 2.4 m wide. Set per tank. Check litres against a dip.

Today versus with diesel tank monitoring

TopicTodayWith monitoring
Finding a lossAt the next dip, days or weeks laterA text within minutes of the drop
Proof for policeA guess at the date and litresTime, rate and volume from the graph
Running dryA flat tank at the outstationA reorder alert at 20 per cent

On a station with tanks all over the place

One gateway covers every tank it can see, and we test signal at each one.

Add a power failure alarm or bore pump run hours to the same gateway.

Got gas for the brooders or heaters? See LPG tank level monitoring. Cropping? See farm diesel tank monitoring.

Large white bulk fuel storage tanks with stairs
Illustrative photo. Photo: Pexels

What it costs

We fix the price after a short scoping call or a site visit. It depends on how many tanks, how far they are from the gateway, and how it gets out. Ongoing support is available as a plan after handover.

Price a fuel tank alert

The fixed price covers

  • A level sensor on every tank you want watched
  • Gateway and Starlink or 4G backhaul
  • Installation and electrical work under QLD Electrical Contractor Licence 1513082
  • Calibration to a dip, alert set-up and a draw-down test, plus training
  • An ongoing support plan: we keep it running, fix faults and replace batteries

What this won't do

  • It tells you soon after a theft starts. It won't stop one. Keep the locks and cameras.
  • Litres are indicative. Foam, condensation, heat and the fill pipe affect the reading, so still dip.
  • It shows how much went, not who took it.
  • It isn't a fuel dispensing control or a certified overfill or leak detection system. It doesn't replace AS 1940 bunding and venting or your own tax records.
  • A tank outside gateway range sends nothing.

With you every step

From the first walk round your tanks to the draw-down test at handover.

  1. 1

    Discovery

    We walk the homestead and outstations, map tanks, bowsers and power, and test signal at each tank.

  2. 2

    Design

    You get a fixed price with sensor spots, gateway location, backhaul and alert rules for each tank.

  3. 3

    Build and test

    We build and test the sensors, gateway and alert rules before anything goes to site.

  4. 4

    Install and commission

    We fit the sensors, do the electrical work, calibrate each tank to a dip and test with a known draw-down.

  5. 5

    Ongoing support

    You get the dashboard, contact list and thresholds, with ongoing support for changes and faults.

Why Holt Systems

We design, install and commission every system ourselves, then look after it with an ongoing support plan. Monitoring supplements the site's own control, protection, fire and safety systems; it does not replace them.

Alerts
SMS to any phone, no app
Based in
Brisbane, QLD
Electrical licence
QLD 1513082
After install
Ongoing support plans
Call
07 2150 3666

Diesel tank monitoring questions

Will it stop someone taking diesel?

No. Readings arrive every few minutes, so a theft is seen soon after it starts, not prevented. It gives you the time and volume for a police report. Locks, lighting and cameras are still worth having.

Does it work if the tank is beyond mobile coverage?

Yes, if the tank is within LoRaWAN radio range of the gateway. The gateway at the shed reaches the internet over Starlink or 4G. Range depends on terrain and buildings, so we test signal at each tank first.

How accurate is the litres reading?

Non-contact level readings are indicative. We calibrate each tank to a dip or strapping chart, and you should still dip now and then to check.

Can it replace my fuel records for the ATO?

No. The Australian Taxation Office wants records of fuel bought, how it was used and any fuel lost or stolen. Level data backs those records up with timestamps, but your purchase and usage records stay in place.

Can one gateway cover the workshop and an outstation?

Only if both are within radio range of one gateway. An outstation out of range needs its own gateway and a way out. We confirm this by testing signal at each tank before we quote.

What happens if the sensor or the internet link fails?

A sensor that sends nothing for one to two hours raises an email alert, because a silent sensor isn't a safe tank. If the internet link fails, texts are delayed until it returns, and we can help fix it.

Price a fuel tank alert

Tell us what you need to watch and where. We confirm the sensors, gateway location and alert recipients, then give you a fixed price.

Or email hello@holtsystems.com.au

Your details are handled in accordance with our privacy policy.

  1. 1

    Tell us about the site

    A few lines on the assets, distances and what you need to know about.

  2. 2

    A call to scope it

    We confirm the sensors, gateway location and alert recipients, and whether a site visit is needed.

  3. 3

    Fixed price

    You receive a defined scope and a fixed price before any work starts.