Cable Gas Online Monitoring Sensor

Model:
HMJ1012-WLQ

 

Product Overview:
The cable gas monitoring sensor is a specialized device designed to detect various gases generated during the operation of underground power cables, typically installed in cable shafts, tunnels, and ducts. Over time, due to insulation aging, overheating, or partial discharge, cables may emit characteristic gases such as hydrogen (H₂), acetylene (C₂H₂), methane (CH₄), and carbon monoxide (CO). The type and concentration of these gases provide valuable insights into the operational status and hidden faults of the cable system. By detecting these gases in real time, the sensor helps identify potential failures early, ensuring the safe and stable operation of the power grid.

 

Key Features:

1. High Sensitivity: Capable of detecting extremely low concentrations of target gases to provide early warnings of potential cable issues.
2. Excellent Stability: Constructed with high-temperature and corrosion-resistant materials for reliable operation in harsh environments.
3. Alarm Function: When gas concentration exceeds preset safety thresholds, the system triggers alerts for timely intervention.
4. Low Power Consumption: Designed for energy efficiency and continuous long-term operation.
5. Easy Installation & Maintenance: Compact design allows for convenient installation and simple upkeep.

 

Technical Specifications:

Parameter	Specification
Gas Types Monitored	Hydrogen (H₂), Acetylene (C₂H₂), Methane (CH₄), Ethane, Ethyl Acetate, Acetophenone, DBP, etc.
Detection Accuracy	±1 ppm
Protection Rating	IP67
Operating Temperature	-40°C to +85°C
Operating Humidity	5% to 95% RH

 

Frequently Asked Questions about cable gas online monitoring sensor

What is the cable gas online monitoring sensor (HMJ1012-WLQ) used for?

The cable gas online monitoring sensor — model HMJ1012-WLQ is designed for online monitoring of gas pressure and density in oil/gas-filled cable systems. It is deployed in oil-filled and gas-filled cable circuits, where it gives maintenance teams continuous or periodic visibility of insulation condition so that defects can be identified before they develop into unplanned outages.

What is the detection accuracy of the HMJ1012-WLQ?

According to the published specification, the detection accuracy is ±1 ppm. This figure is measured under the reference conditions stated in the product datasheet; for project-specific acceptance criteria please refer to the type test report supplied with the quotation.

What happens when the monitored gas value goes out of range?

The HMJ1012-WLQ reports the measured value continuously to the monitoring platform. When the value crosses a configured warning or alarm threshold, the platform raises an alarm so that the operating team can investigate. Because the reading is trended rather than checked only during periodic patrols, slow-developing leaks are found much earlier.

How is the cable gas online monitoring sensor powered and how does it communicate?

The HMJ1012-WLQ uses the following interface configuration: the enclosure is rated IP67. This allows the same device to be fitted in both retrofitted installations and new builds; the exact combination is confirmed at order stage against the site communication architecture.

Is installation possible without an outage?

In most cases yes. Because the cable gas online monitoring sensor is installed on the equipment while it remains energised, the work is normally carried out as a live-line operation by qualified personnel following the site safety rules. Where a sensor must be coupled to an earthed screen, bonded connection or gas compartment, a short outage may be required — this is confirmed during the site survey.

Does HUWOR support OEM/ODM and what is the delivery lead time?

Yes. Zhuhai Huawang Technology Co., Ltd. supplies the cable gas online monitoring sensor under its own brand and also supports OEM/ODM supply, including private labelling, custom firmware functions and integration with the customer’s monitoring platform. Standard units are typically quoted with a lead time confirmed at order stage depending on quantity and configuration; sample and pilot orders are supported.

Applications

The cable gas online monitoring sensor is used for online monitoring of gas pressure and density in oil/gas-filled cable systems. Typical installation sites include oil-filled and gas-filled cable circuits. It is applied both on new assets, where the monitoring function is built into the asset from the start, and on existing assets where it is retrofitted to extend the information available to the maintenance team.

How it works

The instrument converts the physical quantity of interest into an electrical signal, conditions and digitises that signal in the field unit, and passes the result to the monitoring platform or to the operator. Condition assessment relies on the trend rather than on a single reading: the value recorded today is compared with the commissioning value and with the historical series for the same measurement point, and it is the direction and rate of change that indicate whether the asset is degrading.

Installation and commissioning

Installation follows three steps: a site survey to confirm the mounting position, the communication path and the power arrangement; mechanical fitting of the sensor or the use of the instrument on the test point; and finally commissioning, where the readings are verified against a reference and the alarm thresholds are set.

Standards and documentation

Type test reports, calibration certificates and installation documentation are provided with the supply. Where a project requires the equipment to be verified against a specific national or utility standard, the applicable clauses should be stated in the enquiry so that the test scope can be confirmed at quotation stage.