Operating specifications for current sensors

The operating specifications for current sensors cover installation, use, maintenance and safety considerations. The following are detailed guidelines:

1. installation specifications

Location selection

Keep away from interference sources: Avoid strong magnetic fields （such as transformers and motors）， conductive dust and corrosive gases to ensure measurement accuracy.

Three-phase system spacing: In multi-phase measurement, the sensor spacing must be large enough （incorrectly installed） to prevent electromagnetic coupling interference.

Installation mode

Conductor centered: The measured cable/copper bar should pass vertically through the center of the sensor aperture to reduce magnetic leakage error.

Fill rate optimization: The conductor should be as full as possible of the aperture （such as using a copper bar that matches the aperture） to improve the dynamic response.

Fixation and support

Non-conductive bracket: non-conductive materials such as plastic and epoxy plate are used to avoid ferromagnetic materials affecting the magnetic field.

Isolation distance: Keep a distance of >80mm between the sensor and the ferromagnetic bracket to prevent magnetic short circuit.

2. the use of specifications

Wiring and power supply

Power-on sequence: Power on the secondary side of the sensor first, and then connect the current/voltage on the primary side to avoid instantaneous impact damage.

Wire layout: The primary wire passes through the aperture vertically, avoiding multiple turns in parallel （unless the specification allows）。

Range matching

Rating matching: The measured current should be close to the sensor rating （such as IPN）， long-term overload （>2 times） may be damaged.

High frequency application: In high frequency and high current scenarios, it is necessary to evaluate the heat output （proportional to the frequency and current） and leave enough margin.

Environmental factor

Temperature and humidity control: Avoid extreme temperature and humidity environments （such as -40 ° C to 85 ° C）， and force air cooling if necessary.

Altitude impact: When the altitude exceeds 2000m, use IEC 60664-1 derating to improve insulation and heat dissipation.

3. Maintain norms

Cleaning and inspection

Surface cleaning: Wipe regularly with a soft cloth to avoid damaging the shell with corrosive detergent.

Connection check: Ensure that the cable is not damaged or loose, and the support is secure.

Calibration cycle

Key applications: High-precision sensors are calibrated every 6 to 12 months.

Calibration method: Use comparative method （compare standard sensor） or absolute method （use standard source）。

Storage and transportation

Moisture-proof and vibration proof: The storage environment must be dry and ventilated, and special packaging must be used for transportation.

Long-term storage: regular power check to prevent aging of components.

4.Safety precautions

Overload protection

Instantaneous overload: duration of 2 times rated current ≤1 minute to avoid permanent damage.

High frequency pulse: continuous high frequency current needs to monitor temperature rise to prevent core saturation.

Electromagnetic protection

Shielding measures: Use a shield or magnetic shielding material in a strong magnetic field environment.

Three-phase distance: Keep the distance between adjacent sensors >30cm, or install them incorrectly.

Operating specification

Forbidden adjustment: The exposed potentiometer （if any） is used for factory calibration, and users are forbidden to adjust it privately.

Load matching: The output load resistance must meet the requirements of the specification to avoid signal attenuation or damage.

Troubleshooting Guide

No output:

Check whether the power supply polarity and voltage meet the requirements.

Verify that the primary side conductor passes through the aperture and is not saturated.

Accuracy decline:

Calibrate the sensor to check whether the ambient temperature is out of range.

Clean the sensor surface to remove conductive dust interference.

Output exception:

Oscilloscope is used to detect waveform and determine whether there is electromagnetic interference.

Check whether the cable is damaged or in poor contact.

By following the above specifications, the measurement accuracy, stability and service life of the current sensor can be ensured. It is recommended to formulate a personalized operation plan based on the specific model specifications.

2025-03-20 15:35