Dual-Sensor Temperature and Humidity Control for Large or Multi-Compartment Enclosures

TonyZhang
Nov 2
2 min read

Maintaining a stable electrical environment is critical for modern switchgear and control cabinets. Learn more about ODES’s intelligent environmental control solutions at www.odes-electric.com

In switchgear, control cabinets, and electrical enclosures, temperature–humidity controllers are standard for maintaining a balanced environment. However, in large or multi-chamber cabinets, thermal and moisture conditions are rarely uniform.

Typical cases include:

Tall or multi-bay panels, where heat accumulates at the top while condensation risk appears near the base.
Compartments near heat or cold sources, such as transformer bays or VFD chambers, that experience localized extremes.

Using a single sensor may lead to misleading “average” readings that overlook critical hot or damp zones.

A more effective approach is the dual-sensor temperature–humidity controller, which monitors two independent points and bases control on the maximum temperature and maximum humidity detected—covering both overheating and condensation risk in a single system.

Two Product Options for Different Cabinet Designs

Option A – Panel-Mount Embedded Type (TH2-B-2H-D/LED)

Inputs: Two external temperature-humidity sensors
Outputs: Two heater control channels
Alarms: Four—sensor disconnection, overtemperature, overhumidity, and power or communication failure
Communication: Optional RS-485 (Modbus RTU)
Panel cutout: 91.5 × 45.2 mm

This version is suited for front-panel applications where operators require local display, parameter setting, and alarm visibility. Its LED interface provides at-a-glance readings for on-site inspection.

Option B – DIN-Rail Modular Type (THS2-Y-DI/LED)

Inputs: Two external temperature-humidity sensors
Outputs: Two heaters plus one fan
Alarms: Four—disconnection, overtemperature, overhumidity, and power or communication failure
Communication: RS-485 (Modbus RTU) and 4–20 mA analog output
Mounting: Standard DIN rail

Ideal for modular integration, this model interfaces directly with RTUs, PLCs, or DCS systems. It supports both digital communication and analog feedback, enabling local LED indication and remote data acquisition simultaneously—an efficient solution for hybrid or retrofit environments.

Why Two-Point Sensing Matters

Dual-sensor systems provide full visibility of the enclosure’s environmental profile:

Detects thermal gradients and localized humidity accumulation.
Enables precise activation of heaters and fans.
Reduces false alarms and allows independent probe diagnostics.
Improves reliability of remote monitoring with distinct alarm channels and timestamps.

Combined with adjustable hysteresis, timing delay, and fault-priority interlock functions, dual-sensor controllers deliver consistent, verifiable performance in complex enclosures.

For large, multi-compartment, or thermally unbalanced cabinets, a dual-sensor temperature–humidity controller is essential for accurate detection, targeted control, and clear alarm signaling.

The ODES TH2-B and THS2-Y series provide tested, field-ready solutions—offering high accuracy, flexible installation, and easy system integration. Two sensors mean better visibility, better control, and better reliability.

Uneven temperature or humidity can silently degrade system reliability.

Speak with our technical specialists to identify the best configuration—panel-mount or DIN-rail—for your cabinet design.
Request RS-485 Modbus mapping and wiring diagrams for TH2-B-2H-D/LED and THS2-Y-DI/LED controllers.
Strengthen your environmental monitoring strategy with ODES dual-sensor solutions.