Intrinsic safety electronic scales are measuring devices designed specifically for flammable and explosive environments, and their intrinsic safety relies on explosion-proof structures, circuit protection, and precise weighing systems. The core goal of maintenance is to maintain its explosion-proof performance, measurement accuracy, and long-term stability, and avoid safety hazards or measurement deviations caused by improper maintenance. It is necessary to strictly follow the management regulations for explosion-proof equipment, combined with daily inspections, periodic maintenance, and standardized operations, to ensure that the equipment is always in a safe and reliable working state.

Daily maintenance operation specifications

1. Cleaning and dust prevention

-Scale body surface: Wipe the scale pan, shell, and display screen daily with a dry soft cloth to remove dust, oil stains, or corrosive media. Do not use organic solvents containing alcohol or benzene to avoid damaging the explosion-proof coating or sealing gasket.

-Gap cleaning: Use a soft bristled brush or vacuum cleaner to remove dust from the edges of the scale body, wiring ports, and other areas to prevent particles from entering the internal circuit.

-Explosion proof surface protection: Regularly inspect the explosion-proof joint surface of the scale body (such as battery compartment, sensor interface), wipe it with a dust-free cloth dipped in a small amount of rust proof oil to ensure that there is no rust or scratches.

2. Battery maintenance

-Power monitoring: Intrinsic safety electronic scales often use explosion-proof batteries, which need to be checked daily for power and charged in a timely manner to avoid battery damage caused by over discharge. When charging, a dedicated explosion-proof charger should be used and operated in a safe area.

-Battery compartment inspection: Open the battery compartment once a week to check if the electrode contacts are oxidized, and use a moisture-proof agent to keep the compartment dry to prevent leakage or short circuit.

3. Calibration and zeroing

-Power on self-test: Perform a "zero" operation before each use to check if the no-load zero point is stable. If the zero drift exceeds the allowable range (such as ± 0.5kg), immediate calibration is required.

-Weight calibration: Use standard weights (with an accuracy of not less than 1/3 of the scale range) for linear calibration every month, covering the upper, middle, and lower points of the range, with an error controlled within ± 0.1%.

Key points of periodic maintenance

1. Explosion proof performance inspection

-Explosion proof mark confirmation: Check whether the explosion-proof mark (Ex mark, protection level) of the scale body is clear every quarter, and check the validity period of the explosion-proof certificate.

-Circuit integrity: The insulation resistance (≥ 100M Ω) and intrinsic safety parameters (such as Uo, Io, Co, Lo) of the circuit are tested annually by a professional organization to ensure compliance with explosion-proof design requirements.

-Sealing test: Conduct pressure or helium mass spectrometry leak detection on key parts such as sensors and junction boxes to prevent gas intrusion.

2. Lubrication of mechanical components

-Sensor protection: Check the elastic body of the weighing sensor every six months, apply silicone grease for rust prevention, and avoid stress corrosion that may cause a decrease in accuracy.

-Lubrication of moving parts: Drip food grade lubricating oil onto the hinges, adjustment screws, and other components of the folding scale platform to maintain flexibility.

3. Software and Data Management

-System update: Upgrade the weighing terminal firmware annually, fix potential vulnerabilities, and optimize algorithms.

-Data backup: Regularly export weighing records to secure storage media to prevent data loss caused by storage chip failures.

Environmental control and operational taboos

1. Temperature and humidity management

-The working environment temperature should be controlled between -20 ℃~40 ℃, and the relative humidity should be ≤ 85% RH. Sunshades should be installed in high temperature environments, and preheating programs should be started before use in low temperature environments.

-To avoid direct contact of the scale body with ground condensation water or rain, anti-static rubber pads can be laid to isolate moisture.

2. Electromagnetic interference protection

-Keep a safe distance of at least 2m away from strong electromagnetic equipment such as large motors and frequency converters.

-The grounding system needs to be independently set with a grounding resistance of ≤ 4 Ω to prevent lightning strikes or static electricity accumulation.

3. Prohibited behaviors

-It is strictly prohibited to dismantle explosion-proof enclosures, modify circuits, or replace non intrinsic safety certified accessories without authorization.

-Overloading is prohibited (not exceeding 120% of the range) to avoid damage to the sensor from impact loads.

Fault handling and emergency measures

1. Common troubleshooting

-Display abnormality: Check if the power cord contact is loose. If the fault persists after restarting, it may be due to aging of the display screen cable.

-Weighing deviation: First calibrate the zero point. If it is invalid, check whether the sensor is damp or unevenly stressed.

-Communication interruption: Re plug the RS485 interface and test whether the bus voltage matches (typical value 5VDC).

2. Emergency shutdown operation

-When smoke, burnt smell, or abnormal discharge is detected, immediately cut off the power and evacuate personnel, and use backup weighing equipment.

-The faulty equipment needs to be labeled and isolated, and handled by maintenance personnel with explosion-proof qualifications.

Long term disuse maintenance

1. Preparation for sealing

-After cleaning, put in a desiccant and store the battery separately (keeping the battery level at around 50%).

-Apply anti rust oil to the explosion-proof surface, affix a "prohibited" sign on the outside, record the downtime and responsible person.

2. Restart and restore

-Before reactivation, it is necessary to comprehensively test the explosion-proof performance, calibrate the accuracy, and perform 3 full load no-load cycle tests.