Corrosion salt spray test chamber jumping fault troubleshooting and electric heating repair examples

In industrial production and scientific research experiments, cyclic corrosion salt spray test chamber plays a vital role, it can simulate the product tolerance in different temperature environments, to help enterprises to ensure product quality. But the chamber used for a long time, there will inevitably be failures. Today, we share a cyclic corrosion salt spray test chamber to replace the electric heat of the maintenance case.

I.The fault phenomenon description

An enterprise in the use of cyclic corrosion salt spray test chamber for humidity conditions routine test, just run soon after the power jump, resulting in test interruptions.

II. The failure of multiple troubleshooting

TEMAK's maintenance team received a repair report, a rapid response, immediately arranged to go to the scene, the maintenance staff with a wealth of experience, first of all, the cyclic corrosion test chamber of the electrical system for a comprehensive inspection.

1, Cyclic corrosion salt spray test chamber power line detection, along the direction of the power supply access, with a multimeter voltage gear socket output voltage, after checking the voltage is normal; and then use the multimeter resistance gear to measure the line resistance, did not find that the line there is a short-circuit or disconnection phenomenon; line joints are not oxidized, corrosion caused by poor contact anomalies; checking the power supply line power in line with the power requirements of the salt spray test chamber.

2, Multimeter test salt spray test chamber humidity electric heat, electric heat with three-phase four-wire, multimeter resistance file were checked two electric heat, the resistance between its three-phase 64 ohms, zero line on the electric heat shell zero a few ohms. Upon inspection, the line connection is all normal, ruling out the possibility of line failure.

3, Check the salt spray test chamber compressor cooling fan and other equipment cooling fan joints, did not find broken, sintered and other abnormalities.

4, Multimeter resistance file test salt spray test chamber switchboard, evaporator electric heat, after checking are no problem. Open the chamber evaporator baffle, confirm that the heating plate is normal.

5, From the salt spray test chamber control panel to view the recent test curve, found a test project running less than 8 minutes, humidity electric heat just energized heating did not take long to disconnect, and there is no record, after analyzing the presumption that the electric heat is running a few minutes after the test chamber jumped.

Humidity electric heating

III. To determine the cause of the failure of the cyclic corrosion salt spray test chamber and maintenance

Fault point exposure:

maintenance personnel disassembled humidity electric heating components found:

One group of electric heating shell there are hidden cracks, room temperature because the cracks closed did not trigger leakage;

Energized heating, the metal shell thermal expansion and contraction so that the cracks expand, directly in contact with the salt spray test box box grounding parts, triggering leakage short-circuit, resulting in equipment protective power jump.

IV. Accurate repair and verification

After determining the failure point of the salt spray test chamber:

1, Replacement strategy: synchronized replacement of two groups of humidity electric heat (to avoid single-group replacement resulting in load imbalance), the selection of high temperature corrosion-resistant upgraded electric heaters.

2, Installation standards: strictly in accordance with the three-phase wiring order recovery line, to ensure that the zero line grounding is reliable, to avoid phase error triggered by overload.

3, Running test:

3.1 Salt spray test chamber no-load power test: close the test chamber power switch, observe the control panel display is normal, no alarm prompts, the preliminary determination of the electrical system back to normal.

3.2 Rising temperature performance test: salt spray test chamber set room temperature to the highest temperature heating program, through the high-precision sensor monitoring shows that the heating rate up to standard, temperature fluctuations in the allowable range, the heating system is running stably.

3.3 Simulation of double 85 conditions: simulation of industrial-grade high humidity and high heat environment (85 ℃ / 85% RH) test continuous operation for 2 hours, the salt spray test chamber warming stable, accurate humidity control, during the period of time, there is no longer anomalous jumps in power, temperature loss of control and so on, the performance indicators are up to standard. At this point, the cyclic corrosion salt spray test chamber maintenance is completed, successfully delivered to the enterprise to use, the enterprise production and testing work to return to normal.

Maintenance Guide

V. Composite salt spray test chamber maintenance guidelines

I. A salt spray test chamber body cleaning

1, Daily: with a soft cloth to wipe the shell dust, salt crystals, stainless steel with neutral cleaner (such as soapy water).

2, Weekly: check whether the salt spray test box door seal aging, air leakage, timely replacement of damaged parts.

II. The salt spray test box spray system maintenance

1, Nozzle: weekly rinse with distilled water to remove salt crystals; nozzle wear or spray uneven replacement.

2, Salt solution box: every 10-15 days for a solution, with a soft cloth to wipe the inner wall of the precipitation, if necessary, with dilute hydrochloric acid and stubborn salt stains after rinsing.

3, Conduit: blowing with compressed air or warm water rinse, remove salt crystals clogging.

III. The salt spray test chamber temperature and humidity system maintenance

1, Humidifier: with deionized water / distilled water, monthly cleaning tank scale with citric acid solution.

2, Heating tube: after power failure wipe the surface salt / scale, check whether the line is solid.

IV. The salt spray test chamber electrical and pressure system

1, Electronic control box: weekly cleaning salt spray test chamber dust, check whether the components are loose, overheating.

2, Air compressor: regular discharge of salt spray test box tank condensate, quarterly change air filter to ensure stable air pressure.

V. Other components

1, The specimen frame: after the test in a timely manner to wipe the salt stains, to avoid contamination.

2, Collector: keep the salt spray test chamber funnel, measuring cylinder clean, to ensure accurate collection of salt spray.

VI. Downtime maintenance (when not in use for a long time)

1, clean and dry salt spray test chamber body, disconnect the power supply, cover the dust cover.

2, 30 minutes of power run every month to prevent moisture components.