SPD Monitor - lightning protection
High-precision comprehensive sensing, making SPD health transparent
Integrating "measure, compute, display, intelligize" in one. Self-developed 10μA leakage current sensor with 100x improved accuracy. Achieves multi-dimensional status monitoring and degradation analysis of leakage current, temperature, voltage, lightning count and grounding status, with proprietary lifetime prediction algorithm - a revolution from "reactive replacement" to "proactive maintenance".
Product Overview
SPD Monitor (ESM SPD Monitoring Module) is an all-element smart SPD monitoring terminal integrating "measure, compute, display, intelligize". The product features a self-developed 10μA leakage current sensor with 100x improved accuracy, and uses algorithm models trained on massive field data to achieve multi-dimensional status monitoring and degradation analysis.
It monitors leakage current, body temperature, voltage, lightning count, grounding status, SPD telemetry and upstream breaker status in real time, dynamically computing a 0–100.0% lifetime value from 4 key factors to build a millimeter-precision SPD health profile, leaving no hazard hidden.
Widely used in industrial parks, railways, ports, airports, agriculture, mining, equipment, meteorology, water utilities, environmental protection, renewable energy and other fields. Based on high-precision feature data capture and analysis, it truly realizes degradation trend and degradation ratio functions, making it the ideal "IoT + Lightning Protection"Terminal.
Comprehensive Sensing Matrix
- Microampere-level leakage current monitoring (10.0~3000.0μA), early degradation warning.
- Precision temperature tracking (-30~125°C), preventing thermal breakdown.
- 0.1kA sensitive Lightning Strike counter, recording 0~9999 surge events.
- Proprietary Lifetime Prediction Algorithm, quantifying remaining value.
Product Features
10μA-class Leakage Current Sensing
Self-developed 10μA leakage current sensor with 100x improved accuracy. Uses algorithm models trained on massive field data for multi-dimensional status monitoring and degradation analysis.
Proprietary Lifetime Prediction Algorithm
Dynamically computes 0–100.0% lifetime value from 4 factors: telemetry, count, temperature, leakage. Programmable alarm thresholds enable a shift from "reactive replacement" to "proactive maintenance".
Multi-level Smart Alarm Linkage
Dual protection with local audible/visual + remote communication. Triggers alarms when leakage >3000μA, temperature >60°C or lifetime <20%, uploaded in real time via RS485/MQTT.
Open Protocol, Seamless Integration
Standard Modbus RTU protocol, 200+ accessible registers fully open. Supports RS485 networking and MQTT cloud access, configurable byte order, zero integration barriers.
Full-Parameter Status Query
Enter multi-level query menu via panel buttons to view SPD lifetime, three-phase leakage, temperature, voltage, Lightning Strike count, grounding and other full-dimensional data, precise visualization of hidden risks.
Compact and Flexible
Default 7-segment display, optional OLED; physical buttons for convenient field query and configuration; pluggable terminals, 35mm DIN Rail Mounting, 36mm Compact Width, easy to deploy even in tight spaces.
Selection Guide
Model Naming Rules
| Model | Power Supply | Display | DI Inputs | Grounding Status | Lightning Strike Count | Temperature | Leakage Channels | Voltage Channels | Lifetime Prediction | RS485 |
|---|---|---|---|---|---|---|---|---|---|---|
| ESM-21001-R | AC 220V | 7-segment | 2-ch | 1-ch | 1-ch | 1-ch | - | - | - | Yes |
| ESM-11112-R | DC 5V | OLED | 2-ch | 1-ch | 1-ch | 2-ch | 1-ch | 1-ch | Yes | Yes |
| ESM-11312-R | DC 5V | OLED | 2-ch | 1-ch | 1-ch | 2-ch | 3-ch | 3-ch | Yes | Yes |
| ESM-21112-R | AC 220V | OLED | 2-ch | 1-ch | 1-ch | 2-ch | 1-ch | 1-ch | Yes | Yes |
| ESM-21312-R | AC 220V | OLED | 2-ch | 1-ch | 1-ch | 2-ch | 1-ch | 3-ch | Yes | Yes |
* Digital monitoring is used for SPD telesignaling and upstream breaker status. For other configurations, please contact sales for customized solutions.
Technical Parameters
Basic Parameters
| Operating Voltage | DC 4.75~5.25V(5V model)/ AC 160~280V(220V model) |
| Power Consumption | ≤ 2W |
| Operating Temperature | -20℃ ~ 60℃ |
| Operating Humidity | < 95% |
| Weight | 150g |
| Dimensions | 36 × 110 × 69mm(L×W×H) |
| Enclosure Material | Thermoplastic UL94V0 |
| Protection Rating | IP20 |
| Mounting | Standard 35mm DIN Rail Mounting |
| Display | 7-segment / OLED (optional) |
| Communication | RS485 |
| Protocol | Modbus |
Monitoring Functions
| DI Input | Dry contact input, built-in power, 2-ch (monitoring SPD telesignaling and upstream breaker status) |
| Grounding Status | Grounding loop monitoring, 1-ch |
| Lightning Strike Count | 0~9999 times, min trigger 0.1kA |
| Temperature | NTC measurement: -30~125°C, accuracy ±1°C |
| Leakage Current (AC) | 50.0~2400.0μA, accuracy ±20μA |
| Voltage (AC) | 0~600.0V, accuracy ±1V |
| Lifetime Prediction | 0~100.0%, dynamically calculated from telesignaling/count/temperature/leakage |
| Alarm Output | Local audible/visual + remote communication, programmable threshold |
Installation Instructions
Installation Dimensions
Sensor Description
| Sensor | Specification | Applicable Version |
|---|---|---|
| Lightning Strike Count Magnetic Ring | Aperture 12mm, cable length 1m | Basic, Flagship |
| Leakage Current Coil | 4 turns, ratio 2.4mA/480mV, aperture 11mm | Flagship |
| NTC Temperature Sensor | Resistance 10kΩ (R25°C), cable length 15cm | Basic, Flagship |
Interface Diagram
Wiring Definition
| Terminal | Name | Description |
|---|---|---|
| L / N | Power | L: Live; N: Neutral (220V model) |
| 5V / GND | Power | 5V: Positive; GND: 0V (5V model, mutually exclusive with 220V) |
| A / B | RS485 Communication | A: RS485 A terminal; B: RS485 B terminal |
| DI1 | Digital Input 1 | Telesignaling input, other end to GND, polarity-independent |
| DI2 | Digital Input 2 | Breaker input, other end to GND, polarity-independent |
| T | Temperature | NTC temperature input, other end to GND, polarity-independent |
| C+ / C- | Lightning Strike Count | Lightning strike count input, polarity-independent |
| PE | Grounding Status | Grounding input, requires loop between live L and ground wire |
Note: 220V AC input and 5V DC power input are mutually exclusive. Do not connect both simultaneously.
Key Points
- Definition： The SPD Smart Monitoring Terminal is FEXLINK's general-purpose online condition monitoring device for SPDs, compatible with multiple SPD types.
- Core Capabilities： Acquires SPD leakage, temperature, lightning count and telemetry; supports RS485/MQTT upload and integration with FEXLINK Cloud.
- Scenarios： Suitable for online SPD condition monitoring in electrical rooms and smart lightning protection systems.
- Related Products： FSS Smart SPD, FS SPD Monitor, FG Smart Gateway.
Frequently Asked Questions
Product FAQ
What is SPD Smart Monitoring Terminal?
The SPD Smart Monitoring Terminal is FEXLINK's general-purpose online condition monitoring device for SPDs, compatible with multiple SPD types.
What scenarios does SPD Smart Monitoring Terminal apply to?
Suitable for online SPD condition monitoring in electrical rooms and smart lightning protection systems.
How does SPD Smart Monitoring Terminal differ from traditional solutions?
Compared with ordinary telemetry terminals, the smart monitoring terminal provides multi-parameter Real-Time acquisition and cloud upload, enabling predictive maintenance.
How is SPD Smart Monitoring Terminal installed and integrated?
DIN-rail mount, connect to the SPD telemetry terminals and sensors, then wire the RS485 bus and configure upload parameters.
How can I purchase FEXLINK products or request a demo?
Submit requirements via the Contact page on the FEXLINK website, or call +86-755-8653-6148 to request a demo and selection consultation; engineers will propose a matched solution and quotation based on your scenario.
FEXLINK Business Scope
FEXLINK specializes in smart lightning protection and electrical safety, offering a product portfolio covering lightning protection, lightning online monitoring, lightning protection online monitoring, lightning arrester, intelligent lightning arrester, lightning arrester monitoring, grounding resistance, grounding monitoring for smart lightning protection scenarios, while addressing digital distribution, smart distribution, electricity meter, carbon neutral, industrial internet, carbon asset for digital business, helping enterprises achieve safe, efficient and low-carbon energy management.