Fuel Monitoring System in Aravalli: Diesel Logs for Farm Pickups and Shamlaji Taxis

Any fuel monitoring system starts from an honest picture of how vehicles spend their day, and in Aravalli that picture has three parts. The district was carved out of Sabarkantha, with Modasa as headquarters and six talukas: Modasa, Bhiloda, Malpur, Meghraj, Dhansura and Bayad. Sabarkantha, Kheda and Mahisagar are its Gujarat neighbours, and to the north-east it meets Rajasthan near Dungarpur and Udaipur. Roads move from open farmland into low ridges, and many drivers cross the state line in the course of an ordinary trip.

Farm trade is the steady user. Maize, groundnut, castor, cotton and wheat move from villages to market yards in Modasa and nearby towns, and in harvest weeks the queues lengthen. Pickups and tractors spend much of their diesel in short hauls and waiting, and a pickup that queues at a yard with the engine running burns fuel without moving an inch. Kharif produce comes in from about October; wheat follows in spring.

The highway and the temple add the other two parts. The Ahmedabad to Udaipur road passes Shamlaji in Bhiloda taluka, with the Meshwo reservoir nearby, so goods trucks, buses and pilgrim taxis share it. Trucks link Aravalli with Himmatnagar, Ahmedabad and Rajasthan, often on long runs with few facilities. Shamlaji draws bigger crowds on festival and full-moon days, when taxis and jeeps run back-to-back.

Schools and colleges in Modasa, Bhiloda and Bayad send buses and vans to scattered villages, and the monsoon fills the Meshwo and Mazum systems and slows village roads. Each of these vehicles burns fuel on its own timetable. A record kept per vehicle, with dates and places, separates a yard queue from a highway halt and a pilgrim rush from a school run.

Because Omnicomm LLS-AF 4, Mercetech and Mielta Fantom all sit inside the ₹19,999 package, the decision belongs to the vehicle. Consider the distance from tank to tracker, the tank's material, and whether you would rather not replace a sensor battery in a few years. In Aravalli a highway truck, a school bus and a groundnut tractor can reasonably end up with three different sensors, all visible in one Trakzee Premium account.

The wired Omnicomm takes its power from the vehicle and feeds the tracker's analog input along a cable, so nothing inside needs charging. An IP69K seal guards against dust, monsoon spray and washing, it is rated from −40 to +80 °C, and its probe can be cut down for tanks as deep as about 3 m. On a goods truck running to Rajasthan year after year, that arrangement needs little attention once fitted.

Mercetech and Mielta Fantom send their readings by Bluetooth, so no signal cable needs routing along the frame. Mercetech, a capacitive probe, keeps things simple on a long bus or jeep. Mielta Fantom adds Bluetooth 5.0, a long-life internal battery, tilt and temperature sensing, an IP67 body and a four-bolt steel flange for steel or plastic tanks; Mielta's phone app handles its setup, and tractors with plastic tanks are where it often goes.

Both wireless sensors carry batteries that count as consumables outside warranty. BearTech settles the model and probe length after seeing the tank, and a comparable model may be fitted if the listed one is out of stock. A WhatsApp photo of the tank, with a line about the vehicle, is enough to get a recommendation.

The Modasa pickup. A trader sends a pickup with groundnut from villages near Dhansura to the market yard in Modasa. In harvest week the graph shows a four-hour queue with the line sliding gently, so the engine ran most of that time. On days when the driver switches off, the line stays flat. The record gives the trader a simple rule to share, and a figure for what the habit costs. Over a harvest, the gap between the two habits is easy to read.

The Shamlaji jeep. On a full-moon day a jeep owner makes repeated trips to the temple. The fuel report sets each trip's diesel against its kilometres. One refill slip claims more litres than the tank gained, and the owner now has a single dated entry to discuss rather than a vague feeling about the whole day. Next festival season he can plan his fares with real fuel figures in hand.

The border truck. A truck carries goods from Modasa to Udaipur and back. Its refills on the Rajasthan side appear with time and place, so they can be matched to slips like any other. Over a month its consumption rises while idle time stays normal, and the workshop finds a clogged filter. The record pointed to the truck, not the driver.

The Bayad school bus. A school runs a bus through villages around Bayad each morning and afternoon. Its weekly diesel holds steady until monsoon week, when it rises, and route playback shows a long detour around a flooded crossing. The record explains the extra litres to the management in one page. The office also has per-route numbers ready when next year's transport fees are discussed.

Picture a truck leaving Modasa with groundnut for a buyer in Ahmedabad. Its steel tank sits on the chassis. At fitting, the executive opened the top of that tank, cut a capacitive probe to its depth, and sealed it in. The probe's electrical value changes with how much of it is under diesel. As the truck burns fuel, the value falls; at a refill, it rises. There is no float and no moving part, just a steady signal.

That signal reaches the Teltonika FMB920 in the cab through a cable for Omnicomm, or over Bluetooth for Mercetech and Mielta Fantom. The tracker is already logging position, speed and ignition. It bundles the fuel value with them and sends the lot through the Airtel SIM to Trakzee Premium, so each figure carries a time and a place: in the Modasa yard, on the highway towards Himmatnagar, or at a pump on the way.

On the owner's phone the tank becomes a line and a number. While the truck runs, the line slides gently down; a refill is a sharp rise with its date and place; a halt with the engine off is flat; a sharp fall while parked is a single step down, with an alert. Reports turn that line into litres per trip, per day or per hundred kilometres, and two trucks on the same route can then be compared side by side.

All of this rests on calibration, done on fitting day by matching the probe's signal with known quantities of diesel in that particular tank. Should the tank be replaced or welded, or the probe removed, the calibration has to be repeated before the litres can be trusted.

The figure on the screen is a working number and should be read that way. BearTech gives about 95% accuracy on a sound tank once fitting and calibration are done properly. A tank with dents, inner rust, baffles crowding the probe or old welds, and diesel carrying water or sediment, can all pull the number off. Older pickups and trucks deserve a quick tank check before fitting, so mention any repair the tank has had.

Slope and movement matter on Aravalli's ridges. A truck parked on a sloping shoulder near the hills, a tractor on a field bund, or a pickup bouncing down a village lane tilts or rocks the diesel, and the probe reads a different height. The graph wobbles while the vehicle moves. To judge a refill or a loss, compare readings taken parked on level ground, before and after.

Signal is the next limit. Data goes over an Airtel SIM, and hillier stretches and the gaps between villages can lose coverage. The live view pauses there and catches up once the tracker reconnects; across the line in Rajasthan it works wherever Airtel reaches. A gap on the map is a coverage pause, not proof of anything. Tell us the stretches where calls drop on your routes.

Finally the terms. Wireless sensor batteries are consumables outside warranty, and BearTech takes no returns, refunds or exchanges, so tank details and the sensor choice must be agreed first. The package reports and warns; it does not lock a tank or physically hold back anyone drawing diesel. It is a careful monitoring tool for working vehicles, not a laboratory meter. Ask before ordering if your vehicle is unusual.