Short answer
Accuracy is the row everyone reads and the one that decides least. A ±0.5% figure is a percentage of a stated span, so it means nothing until the datasheet names that span. Measurement range, interface, supply voltage and mounting decide whether the sensor physically fits your tank at all.
Key takeaways
- An accuracy percentage is always a percentage of something, usually the measurement span, not the current reading.
- Measurement range is the first hard constraint: the OMNICOMM listing covers 0–4,000 mm, which caps the tank depth it can read.
- The interface row decides integration: RS-485 Modbus RTU needs a serial port, and not every tracker has a free one.
- Supply voltage tolerance matters on a 24 V vehicle, 9–40 V DC accommodates both 12 V and 24 V systems with margin.
- Response time bounds how fast an event can be detected: under 1 second on our listing, versus minutes if reporting is throttled upstream.
01Accuracy is a percentage of something
The accuracy row is the one buyers compare first, and on its own it is close to meaningless. The OMNICOMM listing states ±0.5%, the SOJI LIGO Pro datasheet states ±0.5%, and the Eurosens Dominator specification states ±1%. Those look directly comparable, but a percentage is always a percentage of a reference quantity, and the reference is usually the measurement span rather than the current reading. On a 4,000 mm span, ±0.5% is ±20 mm of level regardless of whether the tank is full or nearly empty. That distinction changes the practical meaning entirely: a percentage-of-reading figure gets tighter as the tank empties, while a percentage-of-span figure does not. Before comparing two accuracy numbers, confirm both are quoted against the same reference, because otherwise the comparison is arithmetic without meaning.
Steps
- Check measurement range against the tank's internal depth
- Match the interface to the tracker's free ports
- Confirm supply voltage covers the vehicle's nominal system
- Judge ingress rating and temperature as two separate rows
- Compare accuracy last, against the same reference
- Note the sensor technology for fuel-blend behaviour
02Measurement range is the first hard limit
Before accuracy matters at all, the sensor has to reach the bottom of the tank. The OMNICOMM listing gives a measurement range of 0 to 4,000 millimetres, which is a physical ceiling on the depth it can read. The SOJI LIGO Pro datasheet states lengths up to 6,000 millimetres, and the Eurosens Dominator is sold in stated lengths, the marketplace listing is the 3-metre variant. This is the row that eliminates options fastest, because a sensor shorter than the tank cannot be compensated for in software: it simply stops reporting below its own reach, and the missing volume is invisible rather than merely imprecise. Measure the internal depth of the tank at the mounting point, not the tank's external height, and leave clearance for the mounting thread and any internal obstruction.
03The interface row decides integration
A sensor that fits the tank still has to reach the tracker. The OMNICOMM listing specifies RS-485 Modbus RTU, and the Eurosens Dominator listing is the RS-485 variant. RS-485 is a serial bus, which means the tracker needs a free serial port and the correct protocol support, not merely a spare wire. Checking this against the tracker's own datasheet is the step most often skipped: our Teltonika FMC003 listing has one RS-232 port, which is a different electrical standard from RS-485 and not interchangeable with it. Where a device exposes an analog input instead, a sensor with a voltage output is the match, and the conversion from voltage to litres becomes a calibration exercise rather than a digital read. Match the interface pair before comparing anything else.
04Supply voltage, and why the range matters
Vehicles run at nominal 12 or 24 volts, and neither is stable: cranking pulls the rail down and alternator charging pushes it up. A wide input range absorbs that. The OMNICOMM listing accepts 9 to 40 volts DC, which covers both nominal systems with margin at each end. The Eurosens Dominator specification states 9 to 32 volts, also spanning both. Current draw belongs in the same reading: the OMNICOMM listing draws under 30 milliamps, which matters when several sensors share a circuit or when the asset is parked and the tracker is running on a backup battery. A sensor whose range only just covers 24 volts nominal will see voltages outside its specification during normal operation, which is a reliability question rather than an accuracy one.
05Response time and what happens after it
The OMNICOMM listing states a response time under one second, and that figure is often misread as the speed at which a theft will be detected. It is not. Response time describes how quickly the sensor itself settles on a new value; what reaches the platform depends on how often the tracker takes a record and on any smoothing applied in between. A sub-second sensor behind a tracker that records every five minutes yields five-minute resolution, and a smoothing filter can flatten a genuine fast change further still. So read response time as a floor on detection latency rather than a promise: it tells you the sensor is not the bottleneck, and it leaves the acquisition interval and any filtering as the two settings that actually determine what an operator sees.
06Ingress and temperature, read as two rows
A fuel sensor lives in a hostile place, and two independent rows describe how well it copes. The OMNICOMM listing is IP68 with an operating range of −40 °C to +85 °C; the Eurosens Dominator is IP67 across the same −40 to +85 °C band; the SOJI LIGO Pro states the same temperature range. Those are separate specifications, and neither implies the other, the ingress digits grade dust and liquids only, with temperature absent from the code entirely. For a top-mounted tank sensor the ingress rating matters most at the gland and the cable entry rather than the probe itself, since that is where water tracks in. A useful comparison point: our Teltonika FMC003 tracker listing is IP41, a far lower ingress result than any of these sensors, because it is designed for a cabin rather than a tank top.
07The reading order that eliminates fastest
Run the rows in the order that rules options out soonest rather than the order they are printed. Start with measurement range against the tank's internal depth, because a sensor that cannot reach the bottom is disqualified regardless of everything else. Then check the interface against the tracker's free ports, since a mismatch here means new hardware. Then supply voltage against the vehicle's nominal system with margin at both ends. Then ingress and temperature as two separate judgements against the mounting position. Only then compare accuracy, and when you do, confirm both figures are quoted against the same reference. Sensor technology is worth noting last: the OMNICOMM listing is capacitive, which is the same operating principle as the Eurosens and SOJI units, so all three behave alike on fuel-blend changes.
| Row | The question it answers | Disqualifies a sensor? |
|---|---|---|
| Measurement range | Can it reach the bottom of my tank? | Yes, check this first |
| Interface | Can my tracker read it without new hardware? | Yes |
| Supply voltage | Will it survive a 24 V rail while cranking? | Yes |
| Ingress rating | Will dust or water get in at the gland? | Sometimes |
| Operating temperature | Will it work on a tank top in summer? | Sometimes |
| Accuracy | How precise is the reading? | Rarely, and only once the reference is known |
| Response time | How fast does the sensor settle? | No, the acquisition interval dominates |
| Sensor technology | How will it behave on a fuel-blend change? | No, but it explains drift |
Figures and sources
- OMNICOMM fuel level sensor stated accuracy and measurement range: ±0.5%; 0 – 4,000 mm (Source: ENTEK.AI product catalogue, as of 2026-08-31)
- OMNICOMM interface, supply voltage and current draw: RS-485 Modbus RTU; 9 – 40 V DC; < 30 mA (Source: ENTEK.AI product catalogue, as of 2026-08-31)
- OMNICOMM response time, ingress rating and operating temperature: < 1 second; IP68; −40 °C to +85 °C (Source: ENTEK.AI product catalogue, as of 2026-08-31)
- OMNICOMM sensor technology and installation method: capacitive (LLS series); top-mount, standard thread (Source: ENTEK.AI product catalogue, as of 2026-08-31)
- Teltonika FMC003 serial port and ingress rating, the tracker side of the interface match: 1× RS-232; IP41; analog input 1 (0 – 30 V) (Source: ENTEK.AI product catalogue, as of 2026-08-31)
- Eurosens Dominator published accuracy, supply range and ingress rating: ±1%; 9–32 V; IP67; −40 to +85 °C (Source: Mechatronics, eurosens Dominator specification, as of 2026-08-31)
- SOJI LIGO Pro published measuring error and maximum length: ±0.5%; up to 6,000 mm; −40 to +85 °C (Source: SOJI Electronics, LIGO Fuel Level Sensor datasheet, as of 2026-08-31)
- What an IP rating grades, relevant because it is printed next to temperature but is unrelated to it: first numeral solids 0–6, second liquids 0–9; temperature absent (Source: IEC, Ingress Protection (IP) ratings, as of 2026-08-31)
Questions
Is a ±0.5% sensor twice as good as a ±1% one?
Only if both figures are quoted against the same reference. A percentage is a percentage of something, usually the measurement span. On a 4,000 mm span, ±0.5% is ±20 mm regardless of tank level. Confirm the reference before treating the two numbers as comparable.
Which row should I check first?
Measurement range against the tank's internal depth. A sensor shorter than the tank cannot be fixed in software, it stops reporting below its reach, so the missing volume is invisible rather than imprecise. The OMNICOMM listing covers 0–4,000 mm; the SOJI datasheet states up to 6,000 mm.
Can I connect an RS-485 sensor to any tracker?
No. RS-485 needs a serial port with matching protocol support. Our Teltonika FMC003 listing has one RS-232 port, which is a different electrical standard and not interchangeable. Check the tracker's port list against the sensor's interface row before ordering either.
Does a sub-second response time mean theft is detected in a second?
No. Response time describes how fast the sensor settles, not how fast the platform learns. What reaches the server depends on the tracker's record interval and any smoothing applied. Read it as proof the sensor is not the bottleneck, then check the acquisition settings.