IoT Pro
Diesel Tank Module
Retrofit diesel tank monitoring and dispensing accountability module for any tank type and any site, combining level measurement, user and asset identification, pump control, and dispensing measurement, built on the IoT Pro hardware architecture.
Product Code: IOTPRO-DIESEL-TANK-MODULE
Product Overview
The IoT Pro Diesel Tank Module is an application-specific configuration of the IoT Pro level monitoring platform, supplied with the accessories required to move from “tank level visibility only” to controlled, auditable diesel dispensing.
It is designed to retrofit onto existing stationary diesel tanks, including custom-built tanks without changing the tank structure, or the pump system.
The module can be deployed in staged configurations depending on operational requirements:
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Monitor-only: Level monitoring and refuelling visibility (submersible probe only)
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User identification: Dispensing linked to a person via iButton authentication
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Asset identification: Dispensing linked to a machine/vehicle/container via QR code scanning
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User + asset identification: Full accountability per withdrawal event
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Dispensing measurement: Pulse metering for accurate dispensed volume logs (optional but recommended) or approximate logs based on level monitoring of tank
This staged approach allows integrators to start with basic visibility and progressively enable control and traceability, or deploy a complete diesel fuel management system from the outset, without changing the core hardware platform.
Typical Installation Points
The IoT Pro Diesel Tank Module is installed wherever a bulk diesel tank is used to fuel assets and consumption must be monitored, controlled, or audited. These deployments typically require both runout prevention (low level alerts) and misuse prevention (who took fuel, for which asset, how much, and when).
Construction Site Tanks
Temporary Fuel Storage / Bulk Diesel Tanks / On-site Refuelling Systems
Industrial Feed Tanks
Generator Supply Tanks / Process Fuel Tanks
Logistics Yards & Fleet Depot Tanks
Fleet Refuelling Stations / Bulk Fuel Storage / Transport Depots
Agricultural & Remote Site Tanks
Farm Fuel Tanks / Irrigation Pump Supply / Off-grid Storage
Contractor Support Tanks
Mixed Machinery Refuelling / Mobile Plant Operations / Multi-Equipment Supply
Any Tank Geometry
Vertical Cylindrical / Horizontal Cylindrical / Custom Fabricated
Measurement & Sensing Capabilities
The IoT Pro Diesel Tank Module uses hydrostatic pressure measurement to determine liquid level, providing stable readings independent of vapours, or foam.
Submersible Pressure-Based Level Measurement
The connected submersible probe measures hydrostatic pressure exerted by the liquid column above it, which is directly proportional to liquid height.
This measurement approach supports:
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Continuous and smooth level readings
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Stable behaviour in real tanks
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Suitability for deep tanks and below-ground installations
Submersible Level Sensor Specifications
Sensor Type | Submersible hydrostatic pressure transmitter |
Measurement Principle | Diffused silicon pressure sensing |
Pressure / Level Range | 0–1 m to 200 m (H₂O reference)
2m/4m most common variants |
Accuracy | 0.5% FS |
Long-Term Stability | 0.25% FS / year |
Probe Material | Stainless steel 304 |
Protection Rating | IP68 |
Cable Type | Vented cable for atmospheric compensation |
This provides a robust baseline for inventory visibility and refuel/runout alerting, even when dispensing measurement is not deployed.
Submersible Level Sensor Specifications
Sensor Type | Submersible hydrostatic pressure transmitter |
Measurement Principle | Diffused silicon pressure sensing |
Pressure / Level Range | 0–1 m to 200 m (H₂O reference)
2m/4m most common variants |
Accuracy | 0.5% FS |
Long-Term Stability | 0.25% FS / year |
Probe Material | Stainless steel 304 |
Protection Rating | IP68 |
Cable Type | Vented cable for atmospheric compensation |
This provides a robust baseline for inventory visibility and refuel/runout alerting, even when dispensing measurement is not deployed.
Submersible Level Sensor Specifications
Sensor Type | Submersible hydrostatic pressure transmitter |
Measurement Principle | Diffused silicon pressure sensing |
Pressure / Level Range | 0–1 m to 200 m (H₂O reference)
2m/4m most common variants |
Accuracy | 0.5% FS |
Long-Term Stability | 0.25% FS / year |
Probe Material | Stainless steel 304 |
Protection Rating | IP68 |
Cable Type | Vented cable for atmospheric compensation |
This provides a robust baseline for inventory visibility and refuel/runout alerting, even when dispensing measurement is not deployed.
Identification & Dispensing Interfaces
Dispensing Accountability
Where dispensing accountability is required, the Diesel Tank Module adds accessories that enable each withdrawal to be attributed to:
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A person (iButton)
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An asset (QR code scan)
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Where configured, a measured dispensed quantity (pulse meter)
User Identification (iButton)
The module supports iButton-based authentication using a 1-Wire iButton reader.
This enables software integrators to implement workflows such as:
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Authorised user lists
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Per-user withdrawal logs
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Shift-based or project-based allocation
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Exception handling (unknown ID, denied dispensing, etc.)
Reader Specifications
Tag Characteristics
Reader Specifications
Tag Characteristics
Reader Specifications
Tag Characteristics
iButton Tag Characteristics (Identifier Key)
1-Wire iButton (serial number key) | Identifier Type |
64-bit unique ROM code | Unique ID |
Stainless steel can format (typical iButton form factor) | Construction |
iButton Reader Specifications (1-Wire)
Interface | 1-Wire |
Operating Temperature | –40 °C to +85 °C |
Case Material | Plastic (polyacetal) |
Fastening | M12 screw mounting |
iButton Tag Characteristics (Identifier Key)
Identifier Type | 1-Wire iButton (serial number key) |
Unique ID | 64-bit unique ROM code |
Construction | Stainless steel can format (typical iButton form factor) |
iButton Reader Specifications (1-Wire)
Interface | 1-Wire |
Operating Temperature | –40 °C to +85 °C |
Case Material | Plastic (polyacetal) |
Fastening | M12 screw mounting |
iButton Tag Characteristics (Identifier Key)
1-Wire iButton (serial number key) | Identifier Type |
64-bit unique ROM code | Unique ID |
Stainless steel can format (typical iButton form factor) | Construction |
iButton Reader Specifications (1-Wire)
Interface | 1-Wire |
Operating Temperature | –40 °C to +85 °C |
Case Material | Plastic (polyacetal) |
Fastening | M12 screw mounting |
Asset Identification (QR Code Scanning)
For asset-level allocation, the module supports a rugged 2D barcode/QR scanner used to scan an asset QR label before dispensing.
QR Asset Labels
For outdoor and industrial environments, QR labels should be produced on weatherproof vinyl with protective laminate to resist water exposure, sunlight, scratching, and tearing which can be provided by IoT Solutions Ltd as well.
Barcode / QR Scanner Specifications
Sensor | 1280 × 800 CMOS |
Resolution Support | 3 mil |
Indication | Buzzer + LED |
Housing | ABS + rubber |
IP Rating | IP65 |
Barcode / QR Scanner Specifications
Sensor | 1280 × 800 CMOS |
Resolution Support | 3 mil |
Indication | Buzzer + LED |
Housing | ABS + rubber |
IP Rating | IP65 |
Barcode / QR Scanner Specifications
Sensor | 1280 × 800 CMOS |
Resolution Support | 3 mil |
Indication | Buzzer + LED |
Housing | ABS + rubber |
IP Rating | IP65 |
Dispensed Quantity Measurement (Pulse Meter)
Where accurate dispensed volume logging is required, the module integrates a pulse-output flow meter.
Two common options are:
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Piusi K24 pulser (cost-effective, turbine type)
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Piusi K600/3 pulser (higher accuracy, oval gear type)
In deployments without a pulse meter, dispensed quantity can be approximated from tank level change, but this is inherently less precise due to turbulence, refuelling overlap, and tank geometry effects.
Pulse Meter Options
Typical Accuracy | ±1% (after calibration) | ±0.5% |
Pulse Factor (K-factor) | 88 pulses/litre | 35 pulses/litre |
Typical Use | Basic dispensing logs | Higher fidelity dispensing logs and tighter reconciliation |
Pulse Meter Options
Typical Accuracy | ±1% (after calibration) | ±0.5% |
Pulse Factor (K-factor) | 88 pulses/litre | 35 pulses/litre |
Typical Use | Basic dispensing logs | Higher fidelity dispensing logs and tighter reconciliation |
Pulse Meter Options
Typical Accuracy | ±1% (after calibration) | ±0.5% |
Pulse Factor (K-factor) | 88 pulses/litre | 35 pulses/litre |
Typical Use | Basic dispensing logs | Higher fidelity dispensing logs and tighter reconciliation |
Pump Control Output (Dispensing Enable)
Where dispensing control is required, the module uses a relay-driven output to enable/disable a pump control circuit based on authentication and configured rules (e.g., authorised user + scanned asset).
A typical implementation uses an industrial relay rated for mains switching (example: 230 V AC coil, 8 A class, 2 changeover contacts depending on wiring design).
IoT Pro Hardware Architecture
Power Architecture & Energy Options
Supports battery-powered deployments where no reliable supply exists, or external DC-powered operation with backup where power is available—well suited for depots, yards, and remote diesel tanks with intermittent site power.
Flexible Connectivity, One Integration Model
LoRaWAN, NB-IoT, LTE Cat-1, and Wi-Fi are supported under the same integration model, allowing tanks in deep indoor yards or basements to use customer Wi-Fi or LoRaWAN, while remote tanks use cellular connectivity, without changing the software integration layer.
Antenna & Mechanical Configuration Flexibility
Internal antenna operation suits most installations, while external SMA or remote antenna configurations support metal tank environments, underground chambers, and high RF attenuation locations.
Industrial-Grade Enclosure for Harsh Environments
The IoT Pro enclosure is rated IP68 and IK10 as standard, providing resistance to water ingress, fuel vapours, dust, vibration, and mechanical impact. This makes the device suitable for long-term installation on diesel tanks, pump skids, outdoor yards, and industrial fuel handling environments without additional protective housing.
System Integration Context
The IoT Pro Diesel Tank Module is designed to integrate as a core component within IoT Pro diesel tank management and fuel accountability solutions, supporting inventory visibility, dispensing audit trails, and optional pump control for enforced workflows.
Refer to link Diesel Tank Monitoring & Fuel Management System.
Technical Documentation
All documentation is written for software integrators, system engineers, and deployment teams and aligns with the IoT Pro platform architecture.