Smart OBM (On Board Mass) Monitoring

Frequently Asked Questions

How does the PM-OBM sensor convert hydraulic suspension pressure into accurate axle group weight and Gross Vehicle Mass (GVM)?

Heavy vehicles equipped with hydraulic or air suspensions experience direct changes in fluid line pressure as payload mass is added to the truck bed or trailer chassis. The PM-OBM sensor taps directly into the hydraulic suspension line, utilizing a media-isolated 316L stainless steel piezoresistive element to measure fluid pressure. The internal microprocessor digitizes this pressure signal and applies pre-calibrated linear transfer equations to convert bar/PSI readings into exact axle group mass (tonnes or lbs) and overall Gross Vehicle Mass (GVM).   

What process connections are used to thread PM-OBM transducers into vehicle hydraulic lines?

The PM-OBM transducer features heavy-duty direct-threaded process connections available in standard 1/4 inch NPT/G or 1/2 inch NPT/G male configurations. Installation personnel thread the 316L stainless steel sensor head directly into existing hydraulic suspension test ports, leveling valve lines, or pressure manifold blocks. The rugged, media-isolated process head handles high pressure spikes, synthetic hydraulic oils, and harsh road road spray without fluid leakage or signal degradation.   

How does the Ellenex Software Platform alert drivers and fleet dispatchers when an axle group is overloaded?

The Ellenex Software Platform incorporates a dynamic multi-channel alerting module. Transport managers establish legal mass limits for individual axle groups (e.g., steer, drive, and trailer groups) along with total GVM thresholds. If excavator or loader operators accidentally overfill a truck during loading, causing hydraulic line pressure to exceed legal weight limits, the platform instantly triggers high-priority alerts via SMS, email, or mobile app push notifications, enabling immediate payload adjustment before the truck hits public roads.   

What role does integrated GPS play alongside mass pressure logging in heavy vehicle transport management?

Combining pressure-based mass estimation with satellite positioning provides spatial context to weight telemetry. The integrated GPS receiver records exact latitude/longitude coordinates and vehicle speed during every measurement cycle. This allows logistics managers to map precisely where loading and unloading events occurred, track speed compliance under heavy loads, verify off-road vs. highway driving conditions, and analyze route-specific payload efficiency across the entire transport network.   

Why is LTE Cat-M1 cellular connectivity superior for long-haul freight trucks traveling through remote regional areas?

Heavy transport vehicles travel across expansive highway corridors where localized Wi-Fi or private gateways are unavailable. LTE Cat-M1 is a licensed 3GPP cellular standard built specifically for mobile IoT assets, featuring active cell tower handover that keeps trucks connected as they travel across regional boundaries. Cat-M1 provides deep signal penetration and broad geographical coverage, ensuring encrypted weight and location telemetry reaches the Ellenex Software Platform reliably from remote forestry roads, mining sites, and rural highways.   

How does Smart OBM telemetry assist fleet operators in meeting Chain of Responsibility (CoR) transport laws?

Chain of Responsibility laws hold all parties in the transport supply chain—including consignors, loaders, and transport operators—legally accountable for road weight breaches. The Ellenex Software Platform automatically logs every time-stamped weight calculation and GPS location into an immutable cloud database. Fleet managers can export comprehensive payload reports proving that vehicles were loaded within legal mass limits before leaving loading facilities, providing definitive legal defense records during regulatory transport audits.   

What battery preservation techniques allow the PM-OBM transmitter to operate up to 10 years without relying on vehicle chassis power?

The PM-OBM system is powered by an internal, replaceable 3.6V Lithium primary battery (LiSOCl2) engineered for long-term stability in extreme temperature (-30°C to +55°C) and high-vibration environments. Managed by intelligent firmware routines, the transmitter remains in a deep sleep state, waking up periodically or upon motion detection to sample hydraulic pressure and GPS coordinates. It packages an AES-128 encrypted telemetry payload, broadcasts via Cat-M1, and returns to sleep. This independent power architecture supports up to 10 years of field operation, ensuring mass logging continues even if trailer power is disconnected.