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Selec HC404 Humidity Controller
Selec HC404 Humidity Controller
The Selec HC404 is a compact digital humidity controller for precise monitoring and control of humidity (0–100% RH). It features dual LED display, relay/SSR output, and operates on 85–270 VAC/DC — ideal for HVAC, storage, and industrial environments.
Selec HC404 Humidity Controller
The Selec HC404 is a compact and reliable humidity controller designed to maintain optimal humidity levels in industrial and commercial environments. It offers precise control through programmable settings and an easy-to-read digital display.
Key Features:
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Dual Display: Simultaneous display of process and set values for quick monitoring.
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Input Compatibility: Supports humidity sensor (0–100% RH) input.
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Control Output: Configurable relay or SSR output for accurate humidity control.
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User-Friendly Interface: Simple keypad operation and clear LED indicators.
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Compact Design: Space-saving 48×48 mm panel size for easy installation.
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Applications: Ideal for HVAC systems, greenhouses, textile industries, storage areas, and clean rooms.
Technical Specifications:
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Model: HC404
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Input: Humidity sensor (0–100% RH)
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Output: Relay / SSR
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Supply Voltage: 85–270 VAC/DC
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Mounting: Panel mount (48×48 mm)
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Display: Dual 4-digit LED display

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Text to Speech TTL Module (Serial to Speech)
- Single row 0.1″ header for easy connection to a host system
- Power requirements: +5 VDC
- 30 mA idle
- 46-220 mA active (depending on speech parameters and output load)
- Communication: Asynchronous 9600 bps serial (8N1)
- Dimensions: 1.25″x1.5″x0.37″
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Text support rate is better
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Interface operation is simpler
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5V single power supply.
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Output directly connected to the speaker, can drive 4 ohms 3W / 8 ohm 2W speakers
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Busy status output, can be connected to the microcontroller IO or indicator light, no need to be left floating.
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Voice effect optimization
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Module miniaturization and easy integration
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Dimension: 33*27.5mm
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With mounting holes

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