JCQL-C Transformer Oil Temperature, Level, Pressure, and Moisture Sensor - M52

Three-in-One Transformer Oil Sensor

Suitable for oil-immersed, fully sealed transformers

Enables real-time online monitoring of oil level, oil temperature, and internal tank pressure within the transformer tank, while simultaneously monitoring the water activity and moisture content (in ppm) of the transformer oil

Collected data is transmitted via RS485 to a smart integration terminal

Product Features

Equipped with an alarm light for alerts; capable of indicating four alarm statuses

This product can replace traditional oil level gauges, oil temperature sensors, and pressure relief valves, providing sensor functionality for online equipment monitoring

Detects changes in oil moisture content in a timely manner, preventing insulation failure caused by increased moisture levels in transformer oil

Provides 24/7 uninterrupted monitoring, promptly indicating the condition of the oil and the tank level

High compatibility; supports CAN-J1939 and RS485-Modbus RTU

Can directly replace traditional oil level gauges, facilitating installation

Product Overview

The JCQL-C Online Monitoring Sensor for Oil-immersed Transformers is designed for fully sealed oil-immersed transformers. It provides real-time online monitoring of oil level, oil temperature, and internal tank pressure within the transformer tank, while simultaneously monitoring the water activity and moisture content (in ppm) of the transformer oil. The collected data is transmitted via RS485 to a smart integration terminal. This product can replace traditional oil level gauges, oil surface temperature sensors, and pressure relief valves, providing online monitoring and sensing capabilities for the equipment. It helps prevent economic losses caused by low oil levels, water ingress, excessive temperatures, and increased pressure in oil-immersed transformers.

Application Areas

Oil-immersed transformers.

Technical Specifications

1. Operating Environment: Temperature -30°C to +80°C, Humidity <85%.

2. Power Supply: 24 VDC.

3. Total Power Consumption: <0.5 W.

4. Oil Temperature Measurement Range: -45°C to 200°C, resolution 0.1°C; measurement accuracy: ≤±2°C for temperatures ≤100°C; ≤±2% of the measured temperature value for temperatures >100°C.

5. Oil Level Range: Distance from the oil surface to the lower edge of the tank cover: -35 mm to 0 mm; resolution 1 mm; measurement accuracy ≤±1.5 mm.

6. Pressure range: -30 to +80 kPa (relative to standard atmospheric pressure), resolution: 0.1 kPa; measurement accuracy: ≤±1.5 kPa. Sealing pressure: ≥21 kPa; oil injection orifice diameter: Ø25 mm.

7. Moisture Detection

Water activity measurement range: 0 to 1 aw

Measurement accuracy:

0–0.6               ± 0.02 aw

0.6–0.9             ± 0.03 aw

0.9–1             ± 0.04 aw

Dissolved water content measurement range: 0–100 ppm; measurement accuracy: ±5%

8. Communication interface: RS485, MODBUS RTU communication protocol.

9. Mounting Thread: G1, M52×2.

10. Sensor Protection Rating: IP68.

11. Design Service Life: ≥10 years.

12. Special operating conditions and requirements shall be determined through consultation between the user and the manufacturer.

13. LED lights are used to replace the traditional color-coded liquid level alarm function; moisture, temperature, and pressure alarm functions have also been added, with adjustable alarm thresholds.

Alarm Definition:

Wiring Definitions:

Figure 1: M52 Thread Structure