Remote Diesel Generator Monitoring

Frequently Asked Questions

How does the PM-DG sensor distinguish between an idle standby generator and an active running engine using pressure threshold detection?

The PM-DG sensor monitors fluid line pressure within the engine's main lubricating oil gallery. When the generator is resting in standby mode, oil line pressure rests at ambient atmospheric levels (0 bar gauge). Upon engine cranking, the mechanical oil pump rapidly pressurizes the lubrication circuit to operational levels (typically 2 bar to 5 bar depending on engine spec). The internal microcontroller detects this rapid pressure differential crossing a pre-programmed threshold, automatically registering an active engine run-state event and switching telemetry reporting rates to capture active operational parameters.   

What process connection fittings are used to tap into diesel engine lubricating oil galleries and fuel supply lines?

The sensor head features heavy-duty direct-threaded process connections available in 1/4 inch NPT/G or 1/2 inch NPT/G male thread configurations. Technicians thread the 316L stainless steel sensor head directly into existing engine gallery plugs, oil filter housing ports, or fuel rail tapping points. The rugged, media-isolated stainless steel diaphragm withstands hot motor oils, diesel fuel chemistry, and continuous high-frequency engine vibration without degradation or leakage.   

How does the Ellenex Software Platform manage low oil pressure alerts during automated weekly generator exercise tests?

Facilities often run automated, un-loaded weekly exercise cycles to verify generator functionality. The Ellenex Software Platform allows operators to define time-gated alerting rules and custom low-pressure thresholds. If the generator fails to build adequate oil pressure within seconds of starting during an exercise test—or if pressure drops during the run cycle—the platform instantly generates high-priority alerts via SMS, email, or app notifications, allowing mechanics to inspect oil levels and filters before a real power outage occurs.   

Why is LPWAN connectivity superior to traditional RS485/Modbus connections to generator control panels?

Interfacing directly with proprietary generator control panels via Modbus or CANbus often requires manufacturer-specific passwords, complex protocol translation, and physical control box modifications that can void equipment warranties. The PM-DG operates as an independent, non-intrusive sensor overlay that directly measures physical oil and fuel pressure. By broadcasting encrypted telemetry directly over LoRaWAN or NB-IoT / LTE-M networks, the system bypasses panel wiring entirely, supplying independent verification of engine health that functions even if the generator's starter battery or main control panel fails.  

What features protect the PM-DG transmitter from harsh engine room heat and mechanical vibration?

Generator enclosures experience high ambient temperatures and severe low-frequency mechanical vibrations during operation. The PM-DG system decouples the direct-threaded IP68 stainless steel sensor head from the IP66 UV-stabilized transmitter housing. The sensor head mounts directly to the engine block while the lightweight transmitter housing mounts to nearby structural frame rails, isolating the sensitive wireless electronics and internal battery from direct engine heat and intense mechanical chatter.   

How does remote fuel feed line pressure monitoring identify fuel delivery issues prior to engine start-up?

Standby generators often fail to start due to air lock in fuel lines, clogged primary fuel filters, or loss of prime in day tanks. By installing a PM-DG sensor on the primary fuel lift pump line, the system continuously verifies static fuel pressure and dynamic feed pressure during priming cycles. Detecting a drop in baseline fuel pressure alerts operators to dry fuel lines or filter blockages, ensuring fuel delivery problems are resolved before the generator is called upon during an emergency.   

What internal power preservation strategy ensures up to 10 years of monitoring without drawing power from the generator starter battery?

The PM-DG monitor is completely self-powered by an internal, replaceable 3.6V Lithium primary battery (LiSOCl2) operating independently of the generator's 12V/24V starter battery. Driven by low-power firmware algorithms, the device remains in a deep sleep state, waking up periodically to sample pressures. If no state change or threshold breach is detected, it transmits a brief health heartbeat and returns to sleep. This ultra-efficient power routine supports up to 10 years of field operation, ensuring monitoring continues even if the generator's cranking battery goes dead.