Maintenance and Repair Guide for Horizontal Dual-Tube Thermal Expansion Coefficient Testers

A horizontal dual-tube thermal expansion coefficient tester is widely used for refractories, ceramics, glass, graphite, polymers, and metal alloys. It provides automated operation, easy testing and control, data printing, experiment archiving, and a rich, searchable database. These capabilities offer modern test methods for factories and research institutes assessing the performance of ceramic and refractory products, as well as for scientific research and teaching. Installation and care - Install the instrument on a stable, vibration-free, clean concrete platform. The workbench height should be below 800 mm. - When loading specimens, handle them gently. Do not push the displacement push-rod forcefully to avoid sensor accuracy degradation or damage. - When positioning the furnace, ensure the specimen is centered in the furnace heating zone. Push the furnace slowly to prevent the specimen holder from striking the furnace and causing damage. Sealing and gas leakage - If gas leakage is observed at the seals on either end of the furnace, promptly replace the sealing materials and tighten the nuts. Post-test cooling - Do not open the furnace immediately after the experiment. Sudden cooling can damage the specimen holder. Only open the furnace when the specimen temperature is below 100 ℃. If the furnace has already been opened prematurely, do not push it back in. Electrical control troubleshooting - Main power indicator off after switching on: Check whether the indicator lamp has poor contact or is burned out. If the lamp is fine, inspect the switch panel fuse and verify the power cord connections are secure. - No readings on voltmeter and ammeter when power is on and the manual adjustment knob is set to maximum: Check the RLS fuse, inspect whether the thyristors (SCRs) are faulty, and confirm that main circuit wiring has good contact. - Output voltage of the main circuit is low (only about half of normal even with the manual adjustment knob at maximum): One of the SCRs may not be conducting. Inspect the SCRs and replace as needed.

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