Product Description

The TAS21 is a high-performance surge arrestor engineered by Yokogawa to protect sensitive Distributed Control System (DCS) network hardware from transient voltage spikes. Specifically designed for coaxial communication lines such as the V net and ER bus, the TAS21 acts as a critical safety barrier against lightning strikes and industrial electrical surges. By shunting excess voltage to the ground before it reaches the Field Control Station (FCS) or communication modules, this protector prevents catastrophic hardware failure and maintains the operational continuity of mission-critical automation networks.

Technical Specifications

System Integration and Protection

In large-scale industrial plants, coaxial cables often span significant distances between buildings or cabinets, making them susceptible to atmospheric electricity. The TAS21 is typically installed at the point where the coaxial trunk enters the cabinet or at the junction of an outdoor cable run. Its bidirectional protection ensures that both the upstream and downstream components are shielded. For maximum effectiveness, the TAS21 must be connected to a low-impedance high-quality ground (Earth) system as specified in Yokogawa’s installation manuals.

FAQ

Q: Does the TAS21 impact network speed or data throughput?

A: No, the TAS21 is designed with high-frequency transparency. Its low insertion loss ensures that V net and ER bus communications remain well within the required timing and signal-to-noise ratio (SNR) tolerances.

Q: Is the TAS21 a maintenance-free device?

A: While it is a passive component, the TAS21 should be inspected after significant lightning events or during annual plant turnarounds. If the gas discharge tube inside the unit is spent, the protector should be replaced to ensure continued safety.