DERELL DGNS-37-R-B | Dual Relay Temperature & Humidity Controller

DGNS-37-R-B is a 24V dual-output, single-sensor microprocessor controller that simultaneously monitors and controls temperature and humidity. Its single-line LED display alternates every 3 seconds, showing one parameter at a time — just like the real device.

Relay-1 controls heating/cooling, Relay-2 handles dehumidifying or humidifying. Each function is independently adjustable with its own hysteresis. The controller does not support PID — it uses ON/OFF control with adjustable hysteresis and delay timers for compressor protection.

You can limit min/max setpoints with password protection — a critical feature in food or mushroom production environments where operator changes must be restricted.

▶︎ Technical Specifications

Power Supply: 24VDC/AC
Outputs: 2 x Relay (heat & humidity control)
Input: Single sensor (DERELL NIS_V1 compatible)
Temperature Range: -20°C ~ +80°C
Humidity Range: 4% RH ~ 95% RH
Display: Single-line 7-segment LED (alternating)
Control Type: ON/OFF (hysteresis-based)
Protection: Galvanic isolation, industrial EMI safe

▶︎ Application Areas

Mushroom farms, hatchery cabinets, textile humidification, tobacco drying, bakery proofing, precision storage environments, cleanrooms, or general RH/temperature critical spaces.

▶︎ Editor’s Notes & Experience

DGNS-37R-A is compact, affordable, and shockingly capable. It handles dual-control with a single sensor, which makes installation simpler. However, the sensor placement is critical.

Never place the sensor directly above a humidifier or water spray source. Once saturated, it will show 100% RH and will confuse the control loop. Install in an average area of the room, away from direct sources. Follow this, and the device will run for years without hiccups.

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