Accurate vacuum readings ensure quality, safety and compliance across industries. They serve as a vital indicator of process control, allowing operators to monitor conditions and provide verifiable data during inspections. Expert calibration of a vacuum gauge is an essential preventive measure that keeps your operation running.
At Garber Metrology, we help clients maintain accuracy with specialized calibration services. Our experts test, calibrate and inspect per industry standards, minimizing downtime and keeping vacuum gauges across the country up to spec.
Calibration involves computerized tools, hand pumps, and reference gauges, which we verify are working properly before beginning calibration. These pressure/vacuum devices can set a specific pressure or vacuum, and we test your gauge against that standard to ensure its readings are correct.
During vacuum calibration, our technicians set a known standard for the tested pressure/vacuum points and take readings from your gauge. We look for deviations between the standard and your gauge’s measurements and report those results to you.
For many instruments, we test four points within the gauge’s capacity, spaced 25% apart.
During vacuum calibration, our technicians may determine that your vacuum gauge is out of tolerance. This issue can happen for various reasons, and some problems are repairable, depending on your gauge and the problem causing inaccurate measurements.
Testing various points on your gauge lets us pinpoint where inaccurate readings are coming from. Our findings can help your company discern the problem.
Vacuum gauge calibration can help you determine the cause of the problem and decide whether repair or replacement is a better option.
Our thorough calibration services meet the universal requirements of ISO/IEC 17025, ensuring technical competence and the ability to produce precise, reliable data. Some of the steps we may follow include:
Vacuum gauges are highly sensitive instruments and can lose accuracy from a combination of factors. Over time, natural aging and material fatigue may cause a gradual deviation from the true pressure value. Other external factors may include:
The needles on the instrument may shift or vibrate uncontrollably, causing inaccurate readings. This happens when the delicate internal spring or diaphragm on the physical mechanism has been fatigued, overpressured or mechanically damaged. If the needle does not return to zero, this may indicate that the internal sensing element is deformed or misaligned.
When pressure exceeds the vacuum gauge’s designed measurement range, the instrument may lose accuracy. The internal components are sensitive to excessive force and can be permanently bent, warped or detached. Some consequences of overpressure include off-zero pointers, split diaphragms, ruptured bellows and bulged Bourdon tubes.
When the instrument is exposed to moisture or aggressive chemical media, it can corrode. This process degrades the physical and mechanical components of a vacuum gauge responsible for measuring pressure. Affected components compromise the gauge’s structural integrity, leading to sluggish, inaccurate or erratic readings.
Byproducts like rust or chemical scaling can accumulate and clog the pressure port. This restricts media flow to the sensor, resulting in a slow response time and potentially causing the gauge to fail to show the true vacuum level. In analog gauges, corrosion can seize or erode internal gears and linkages, increasing internal friction and resulting in stiff readings.
Vacuum gauges clog when contaminants are pulled into the sensor or the narrow Bourdon tube. Pump oil, moisture or particulate matter in these places disrupts the sensing mechanism, creating false, low or dampened readings. A clogged gauge fails to detect the true vacuum level at the system’s port, resulting in higher, less accurate readings or causing readings to fluctuate wildly.
Several situations may damage your vacuum gauge, causing it to fail. Dropping the instrument, excessive vibration or sudden overpressure can deform or misalign the components required to measure minute pressure differences.
Executing vacuum gauge calibration requires experts in accredited calibration to ensure compliance and accuracy. Garber Metrology provides ISO/IEC 17025-accredited calibration, ensuring your documentation is audit-proof. We offer in-house and on-site services to meet your operation’s needs.
Fill out our online form to get a quote for your vacuum gauge calibration requirements.
