HM Digital PSC-54 Single Line EC/TDS Mini Controller with 4-20mA Output
- Part #:PSC-54
- Condition:Brand New

Overview
The HM Digital PSC-54 Single Line EC/TDS Mini Controller is a compact yet powerful instrument designed for precise and reliable monitoring and control of water quality in commercial and industrial applications. Specifically engineered for water treatment professionals, this controller offers extended range measurement of both Electrical Conductivity (EC) and Total Dissolved Solids (TDS). Its key feature is a 4-20mA output signal, enabling seamless integration with existing industrial control systems, data loggers, and other compatible devices. The PSC-54 provides accurate readings, convenient temperature monitoring, and adjustable relay control for automated responses to water quality parameters, ensuring optimal system performance and water quality management.
Key Features
- Extended Measurement Range: Accurately measures a wide spectrum of TDS values from 0-9999 ppm (mg/L) and 0-10.0 ppt (g/L), and EC values from 0-9999 µS/cm and 0-20.00 mS/cm.
- Standard 4-20mA Output: Provides a universal analog signal for effortless integration with industrial control systems, PLCs, data acquisition units, and other monitoring equipment.
- User-Friendly Digital Calibration: Simplifies the calibration process, ensuring accurate and dependable readings with easy digital adjustment.
- Integrated Temperature Display: Allows for convenient monitoring of water temperature alongside EC/TDS levels on the clear LCD display.
- Adjustable Relay Control: Enables automated control of external devices such as pumps or valves, automatically stopping or activating them when EC/TDS levels exceed user-defined set points.
- Durable Stainless Steel Electrode: Features a robust stainless steel sensor probe designed for long-lasting performance and reliability in demanding industrial environments.
- Complete Installation Kit: Includes all necessary components for straightforward installation and immediate operation.
Specifications
- Brand: HM Digital
- Model: PSC-54
- Measurement Range:
- TDS: 0-9999 ppm (mg/L); 0-10.0 ppt (g/L)
- EC: 0-9999 µS/cm; 0-20.00 mS/cm
- Resolution:
- 0-99.9: 0.1 ppm/µS
- 100-9999: 1 ppm/µS; 0.1 ppt/mS
- Accuracy: ±2% of Full Scale (F.S)
- Temperature Compensation: Automatic (1 – 65˚C / 33.8 – 149˚F)
- Calibration: Digital push-button calibration for EC/TDS
- Output Signal: 4-20mA
- Relay Output: Normally Open (NO) or Normally Closed (NC) selectable relay
- Power Source: AC 110V/220V (switchable)
- Display: 2.3” LCD with backlight
- Probe Connection: 1/2” NPTF threaded fitting, 3 m (9.8 ft.) cable
- Probe Material: Stainless Steel
Ideal for
Essential for commercial water treatment applications, ensuring optimal water quality through precise EC/TDS monitoring and automated adjustments. Critical for industrial water systems, providing reliable data for process control and equipment protection. Highly suitable for hydroponics and aquaculture, maintaining precise nutrient solution concentrations for optimal growth. Valuable for aquariums, ensuring stable and healthy water parameters for aquatic life. Useful in laboratories for accurate monitoring of solution conductivity and concentration.
Performance and Characteristics
The HM Digital PSC-54 delivers accurate and reliable monitoring of EC and TDS levels across an extended range, crucial for maintaining optimal water quality in various applications. The industry-standard 4-20mA output allows for seamless integration with external control and data acquisition systems, enabling real-time monitoring and process automation. The user-friendly digital calibration ensures consistent accuracy. The integrated temperature display provides valuable context for EC/TDS readings, as these parameters are temperature-dependent. The adjustable relay control offers a simple yet effective way to automate responses to changing water quality, protecting equipment and ensuring process stability. The durable stainless steel electrode is designed for long-term reliability in demanding environments.
Additional Information
HM Digital is a reputable manufacturer known for producing high-quality and reliable water quality instrumentation. The PSC-54 is designed with industrial users in mind, offering a robust and accurate solution for continuous EC/TDS monitoring and control. Its extended measurement range provides versatility for a wide variety of water types and applications. The inclusion of a standard 4-20mA output makes it easy to incorporate into existing control infrastructure. The durable stainless steel probe ensures reliable measurements over extended periods. This mini controller provides a cost-effective and efficient way to maintain precise control over water quality in critical industrial and commercial processes.
Kit Contents
- 1 x HM Digital PSC-54 Single Line EC/TDS Mini Controller
- 1 x SP-1-PSC Stainless Steel Sensor Probe with 3m cable
- Mounting Hardware
- User Manual
Take precise control of your water quality with the compact and integration-ready HM Digital PSC-54 EC/TDS Mini Controller! Ensure optimal system performance with reliable monitoring and automation.

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Range | 0-9999 ppm (mg/L); 0-10.0 ppt (g/L) EC: 0-9999 µS; 0-20.00 mS |
Accuracy | +/- 2% |
Resolution | 0-99.9: 0.1 ppm/µS; 100-9999: 1 ppm/µS; 0.1ppt/mS |
ATC | Yes (1 - 65°C) |
Calibration | Digital to any point |
Set Point | On-screen buttons |
Relay Control | Simple switch, user-defined set point |
Alarm | Optional setting |
Display | 2.3" LCD Display w/ backlight |
Probes | 1/2" NPTF, 3 m (9.8 ft.) cable |
Power Source | AC 110V / 220V |
Dimensions | 9.6 x 4.8 x 10 cm (3.8 x 1.9 x 3.9 in) |
Weight | 261g (9.02 oz.) |
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