💡 Key Summary: 4-Channel Leak Detection Control Module for Acid/Alkali & Inorganic Solutions, Managing Up to 4 Zones Simultaneously
YHSM-04S-AR is a 4-channel leak detection control module designed for acid, alkali and inorganic solution leak point sensors, supporting up to four YHSP-SAR or YHSP-SAR-Ex sensors. It provides real-time leak monitoring, LCD status display, user-adjustable sensitivity and NO / NC relay outputs. RS-485 (Modbus RTU / YH-BUS) supports integration with PLC, DCS and SCADA systems. An MTL7760ac Zener barrier is required when connecting YHSP-SAR-Ex in an intrinsically safe system.
A 4-Channel Leak Detection Control Module with LCD Monitoring and Host System Integration
YHSM-04S-AR: Leak Detection Controller for Acid/Alkali & Inorganic Solutions
For acid, alkali and inorganic solution applications, YHSM-04S-AR supports real-time leak monitoring and alarm and control integration. YHSM-04S-AR 4-Channel Leak Detection Control Module connects up to four YHSP-SAR or YHSP-SAR-Ex leak point sensors through four channels. Operators can monitor status and configure settings on the LCD. The module provides two relay contacts per channel and four common contacts, together with RS-485 communication for host system integration.
⚡️ 4-Channel Leak Monitoring & Alarm Output
• Provides real-time monitoring for up to four leak point sensors.
• Provides NO / NC relay outputs for leak alarm signaling.
🔗 Compatible Sensors & System Configuration
• Designed for YHSP-SAR and YHSP-SAR-Ex leak point sensors for acids, alkalis and inorganic solutions.
• An MTL7760ac Zener barrier is required for an intrinsically safe system using YHSP-SAR-Ex.
🖥️ Integrated LCD Monitoring & On-Site Configuration
• View operating status and configure settings on the 60 × 33 mm LCD.
• Adjust sensitivity for each channel to match site conditions.
⚙️ Per-Channel / Common Contacts & Monitoring Integration
• Provides 2 relay contacts per channel and 4 common contacts for alarm and control integration.
• Supports PLC, DCS and SCADA integration via RS-485 (Modbus RTU / YH-BUS).
"YHSM-04S-AR enables both zone-based detection and centralized monitoring,
building a 4-channel response system for acid/alkali and inorganic solution leaks."
| Model | Product Description | Detection Targets & Connection |
| YHSP-SAR | Electronic Leak Point Sensor | For Acid/Alkali & Inorganic Solutions | Acids, alkalis and inorganic solutions. (Up to 4 compatible sensors per module) (YHSP-SAR-Ex requires an MTL7760ac Zener barrier) |
| YHSP-SAR-Ex | Intrinsically Safe Electronic Leak Point Sensor | For Acid/Alkali & Inorganic Solutions |
| Item | Detailed Specification |
| Model | YHSM-04S-AR (4-Channel Leak Detection Control Module) |
| Number of Channels | 4 Channels |
| Supported Sensors | YHSP-SAR / YHSP-SAR-Ex Leak Point Sensors |
| Sensor Capacity | Up to 4 Sensors |
| Detection Method | Phase Shift |
| Display | 60 × 33 mm LCD Status Display |
| Power Input | DC 24 V (±10%) |
| Power Consumption | Max. 3 W |
| Power Indicator | Power status indicator (PWR) |
| Alarm Output | • Relay Outputs (NO / NC) for leak alarm signaling • 2 relay contacts per channel and 4 common contacts |
| Communication | RS-485 (Modbus RTU / YH-BUS); 2-wire interface |
| Baud Rate | 9,600 / 14,400 / 19,200 / 38,400 / 57,600 / 115,200 bps |
| Maximum Communication Distance | Up to 1,200 m depending on cable type |
| Operating Temp / Humidity | -20 to +60 °C / 10 to 90% RH (non-condensing) |
| Storage Temperature | -30 to +70 °C |
| Materials | ABS, PC, Aluminum |
| Mounting | Panel Mount |
| Dimensions (W×H×D) | 94 × 178 × 32 mm |
| Weight | Approx. 500 g |
| Core Functions | • Connect up to four YHSP-SAR or YHSP-SAR-Ex leak point sensors • Integrated LCD monitoring of settings and status (LCD 60×33mm) • User-adjustable sensitivity for each channel • RS-485 (2-wire), Modbus RTU and YH-BUS for PLC, DCS and SCADA integration • MTL7760ac Zener barrier required for an intrinsically safe system using YHSP-SAR-Ex • Relay contacts: 2 contacts per channel and 4 common contacts |
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