The TPL 503 is an Industry 4.0 smart control system for hermetically sealed oil transformers that replaces traditional electromechanical controls with a single electronic sensor monitoring three critical parameters simultaneously: oil temperature, pressure, and level. The IP67-rated sensor head mounts directly on the transformer via an integrated flange with 360° transparent housing for visual level confirmation. Two control unit options are available — the compact BB211 (DIN rail, LED indicators) or the NT210 K (92×92 mm panel mount with 3-digit display and IP65 front).

How does the TPL 503 detect and respond to fault conditions?

The sensor continuously monitors all three parameters and transmits data to the control unit via a 4-wire shielded cable up to 40 m. Each parameter has two independently configurable alarm thresholds (AL.1 and AL.2). The BB211 provides one alarm relay (SPDT) and one trip relay (SPDT), while the NT210 K adds a dedicated fault relay (SPDT) and a fan control relay (SPST). Built-in self-diagnostics detect sensor faults and signal via flashing LED indicators. All maximum values, minimum level, and alarm events are stored in non-volatile registers with 10-year data retention.

Can the TPL 503 integrate into remote monitoring and predictive maintenance systems?

RS485 Modbus RTU is standard on both control units. An external CONV ETH converter adds Ethernet connectivity, and the system is compatible with Netbiter Argos (EasyConnect 250) for cloud-based remote monitoring via PC, tablet, or smartphone. This enables predictive maintenance — operators track temperature and pressure trends over time rather than reacting to alarm trips. A marine-environment variant (TPL 503 ED19) is available with AISI 316 stainless steel fittings and salt-mist corrosion resistance per ISO 60068-2-52:2017.