When evaluating a vacuum degree tester for vacuum switches, procurement personnel often ask the same question: after the equipment is purchased, what exactly should be noted in on-site operation and maintenance, and which steps are prone to deviation? This question is directly related to whether the instrument can be used stably over the long term, and it also affects the traceability of measurement data. The following focuses on the maintenance and operation points of the GSZK-3 vacuum switch vacuum degree tester, using a Q&A format to sort out the technical details that need attention in the procurement process.
Q: What confirmations should be made on the switch body before testing?
A: Before testing, confirm that the switch tube is in the open position and disconnect the primary circuit to avoid the influence of live voltage or circuit series connection on the measurement results. This step is a basic safety and measurement condition requirement, and during procurement it can be included in on-site work instruction documents, specifying who confirms it and how it is recorded. For medium-voltage vacuum switches, the arc extinguishing chamber being in the open position is a prerequisite for measurement by the magnetron discharge method; when this condition is not met, the readings have no reference significance.
Q: How should the magnetron coil be selected and installed?
A: The coil should be selected in a specification matching the arc extinguishing chamber tube diameter, and during installation it should be ensured that it fits tightly against the tube wall. Poor fit will change the excitation conditions and thereby affect the stability of the vacuum degree readings. When preparing the configuration list, procurement personnel should pay attention to whether the coil specifications cover the arc extinguishing chamber tube diameters commonly used in their unit, so as to avoid the situation where measurement cannot be performed on site due to mismatched coils.
Q: How should measurement parameters be set and read?
A: After setting the magnetic field voltage, start the measurement and read the vacuum degree value. The measurement resolution of this instrument is 10⁻⁵Pa, the allowable ambient temperature is -20℃～50℃, and there are also corresponding limits on air humidity. During procurement, the environmental adaptability should be checked against the climatic conditions of the region of use, and attention should be paid to whether the resolution meets the unit's needs for judging the deterioration trend of vacuum degree.
Q: What aspects should be noted in daily maintenance?
A: The coil and connecting cables are wearing parts and should be kept clean after use and protected from folding and pressing; the instrument should be stored away from high-humidity and high-temperature environments, and the display and key functions should be checked regularly. It is recommended that measurement data be recorded on site and corresponded with the equipment ledger to facilitate subsequent re-test comparison. In the procurement process, spare parts supply and calibration services can be taken into consideration to reduce the risk of downtime during long-term use.
Q: How can procurement personnel judge the match between the instrument and their unit?
A: Key checks include the applicable voltage level range, measurement resolution, environmental conditions, and coil configuration, while also confirming whether the operating process is convenient for on-site personnel to execute. The GSZK-3 adopts a non-disassembly measurement method, making it suitable for completing vacuum degree screening of arc extinguishing chambers within a power outage maintenance window. Procurement personnel can evaluate the configured quantity based on the number of switches in their unit and the maintenance schedule.
