LPMDL-210X IoT Data Logger
Built-in radar level, built-in pressure sensors and an Ex variant designed for ATEX Zone 0
The ThingsLog LPMDL-210X is the new generation of our low-power data loggers and controllers: one sealed IP68 unit with the sensors already inside.
A 60 GHz radar level sensor measures through the bottom of the enclosure with nothing touching the water, and up to two 0–16 bar pressure sensors read a main or the inlet and outlet of a PRV. Temperature and humidity are measured on every unit.
The family has two models: LPMDL-2106 with LTE Cat M1 / NB-IoT, including an Ex variant designed for ATEX Zone 0, and LPMDL-2104 with 4G LTE Cat 1bis and a 12 V supply option.
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Key Features and Capabilities
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1. Built-in Radar Level Sensor
- 60 GHz radar inside the logger measures through the enclosure wall
- Narrow 8° beam keeps manhole walls, ladders and pipes out of the measurement
- Range up to 6 m; sensor accuracy from 2.7 mm at short range to 5.1 mm at long range (typical standard deviation, A121 datasheet)
- Advanced detection of objects at different levels within the measuring range
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2. Built-in Pressure Sensors
- One or two internal 0–16 bar transducers with the process connection on the enclosure
- Minimum, maximum, mean and standard deviation per interval, with transient capture for burst detection
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3. Ex Variant for ATEX Zone 0
- The LPMDL-2106 Ex variant is designed to intrinsic safety requirements for Zone 0, target marking II 1G Ex ia IIB T4 Ga
- ATEX certification is in progress; ask us for the current status before planning an installation in a hazardous area
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4. LTE-M, NB-IoT and 4G
- LPMDL-2106: LTE Cat M1 and NB-IoT for the lowest power budget and the deepest coverage in chambers and manholes
- LPMDL-2104: 4G LTE Cat 1bis for higher upload volumes and Modbus polling
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5. Years on One Battery
- Built-in 3.6 V lithium pack of two D-size cells, sized for years of unattended logging
- The LPMDL-2104 is also available with an external 12 V DC supply
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6. Inputs and Outputs per Build
- Up to 8 ports: pulse, 0–20 mA and 0–3 V analog, alarm inputs and relay or digital outputs
- Reads reed switch, open collector and KYZ (Form C) pulses, including 3-wire US water meters
- Optional RS485 Modbus RTU master for meters, analysers and drives
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7. IP68 Enclosure
- Sealed polycarbonate enclosure, IP68, for meter pits, chambers and manholes, from −40 °C to +60 °C
- Internal antenna in the cover and one connector on the bottom: nothing to assemble on site
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8. Alarms and Remote Management
- Threshold and profile alarms per channel, with faster upload after an alarm
- Configuration and firmware updates over the air from the ThingsLog platform, with no site visit
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9. Contactless Level Measurement
- The radar measures from above with nothing in the liquid: no float, no probe and no cable in the flow
- Foam, vapour and deposits do not affect the reading, and there is nothing to clean
- Suitable for dusty environments
Why the LPMDL-210X
Lower Installed Cost
The sensors are inside the logger, so there is no external transducer, cable or gland to buy and install.
Nothing in the Flow
Radar measures from above, so there is no probe to foul, clean or replace in sewage.
Hazardous Areas
The Ex variant is designed for Zone 0, where sewer gases can form an explosive atmosphere.
Early Warning
Level and pressure alarms reach the operator before a blockage becomes a spill or a transient becomes a burst.
Fits Every Site Type
One device family for sewers, tanks, PRVs, meter pits and Modbus sites.
Remote by Design
Settings, firmware and data gaps are handled over the air from the ThingsLog platform.
Applications
Water and wastewater utilities use the LPMDL-210X wherever a level or a pressure has to be watched without mains power and without regular site visits: sewer manholes, CSO chambers, wet wells, tanks, PRVs and meter pits.
Sewer Blockage and Fatberg Detection
✔️ The logger hangs on a bracket under the manhole cover and the radar looks straight down at the flow
✔️ The 8° beam stays clear of the walls and the ladder at depths up to 6 m
✔️ An alarm is raised when the level stays above its normal daily profile, before the sewer surcharges
CSO and Stormwater Overflow Monitoring
✔️ Records when and for how long an overflow is active
✔️ Gives time-stamped evidence for spill reporting
Pressure and Flow at a PRV
✔️ Two built-in sensors are connected upstream and downstream of the valve, and a pulse input reads the flow meter
✔️ Inlet pressure, outlet pressure and flow are recorded for the same intervals
✔️ Transient capture points to bursts and water hammer, and an output can switch the pilot valve
Tank and Reservoir Level
✔️ Measures level through the roof hatch with nothing in the water
✔️ Switches pumps from local rules or from the platform
How It Works
1. Install
• The radar build hangs under the manhole cover; pressure builds screw onto the process connection • One battery-powered unit, no mains power and no external sensor wiring
2. Measure and Transmit
• The logger measures at the interval you set and sends the data over LTE-M, NB-IoT or 4G • Readings buffered during an outage are delivered when the link returns
3. Alarm
• The platform checks every reading against thresholds and profiles • An alarm triggers faster uploads, so the operator sees the event as it develops
4. Act and Report
• Dashboards, reports and an API turn the data into work orders and compliance records • Outputs can switch pumps and valves from the same device
One Logger for Level, Pressure and Hazardous Chambers
The ThingsLog LPMDL-210X combines a data logger, a radar level sensor and pressure sensors in one IP68 enclosure. It removes the external sensor, its cable and its gland, which are the usual points of failure in chambers and manholes. With LTE Cat M1, NB-IoT or 4G connectivity, years of battery life and an Ex variant designed for ATEX Zone 0, it is built for the places where monitoring has been too difficult or too expensive: sewers, CSO chambers, wet wells and remote pressure points.
See It in a Solution
Sewer Blockage and Fatberg Detection
Radar level monitoring in manholes gives early warning of blockages, fatbergs and overflows.
LPMDL-210X: FAQs
Answers about the built-in sensors, connectivity, battery life and hazardous areas.
What is the difference between the LPMDL-2106 and the LPMDL-2104?
The LPMDL-2106 uses LTE Cat M1 and NB-IoT and has the lowest power consumption; it is also the model with the Ex variant. The LPMDL-2104 uses 4G LTE Cat 1bis and can be powered from 12 V DC, for sites with higher data volumes or Modbus polling.
How does the built-in radar level sensor work?
A 60 GHz radar measures the distance to the liquid surface through the bottom of the enclosure. The range is up to 6 m with a typical accuracy of ±5 mm, and nothing is in contact with the liquid. The sensor is suitable for dusty environments and supports advanced detection of objects at different levels. The beam angle is 8°.
Can the logger be installed in an ATEX zone?
Only the Ex variant of the LPMDL-2106 is designed for installation in hazardous areas, with target marking II 1G Ex ia IIB T4 Ga for Zone 0. Certification is in progress, so please contact us for the current status. Standard builds must stay outside the zone.
How long does the battery last?
The built-in lithium pack is sized for years of operation. The exact life depends on the measuring and upload intervals and on network coverage; we estimate it for your profile on request.
Which external sensors and meters can I connect?
Depending on the build: pulse meters with reed switch or open collector output, 0–20 mA and 0–3 V sensors, dry-contact alarms, relay outputs and Modbus RTU devices over RS485. KYZ (Form C) pulse outputs and 3-wire US water meters are supported.
How accurate is the radar at different distances?
The radar sensor element is the Acconeer A121. Its datasheet gives the distance accuracy as a typical standard deviation at 25 °C for each measurement profile: 2.67 mm (profile 1), 3.45 mm (profile 2), 2.83 mm (profile 3), 3.38 mm (profile 4) and 5.05 mm (profile 5). Short profiles are used for short distances and long profiles for long distances, so the accuracy is about 3 mm at close range and about 5 mm at the far end of the range. Two objects at different levels are told apart when they are at least 30 mm apart with profile 1 and 222 mm with profile 5.
Still have questions? Contact us to discuss your wastewater metering needs or visit our Help Center.
