Title: Industrial Vacuum Gauge Selection and Usage Guide: Precise Measurement for Process Safety

I. Core Parameter Matching for Selection

The selection of industrial vacuum gauges must strictly align with process requirements:

1. Range Coverage: Choose a measurement range based on the system's ultimate vacuum (e.g., 10⁻³ Pa) and working vacuum (e.g., 10 Pa). Avoid excessively wide ranges that reduce accuracy or overly narrow ranges that risk damage.

2. Media Compatibility: For corrosive gas environments, select 316L stainless steel or ceramic sensors to prevent corrosion of ordinary metals. High-temperature applications require cooling sleeves or high-temperature probes (e.g., tungsten-rhenium alloys).

3. Response Speed: Fast pumping systems (e.g., semiconductor coating) necessitate capacitance diaphragm gauges with response times ≤0.1 seconds to avoid measurement lag and process instability.

II. Installation and Calibration Standards

1. Sampling Point Location: Install the vacuum gauge probe 1.5 times the pipe diameter upstream of the pump inlet, away from turbulent areas like valves and bends, to ensure accurate system vacuum readings.

2. Anti-Contamination Design: In dusty or condensing environments, add dust filters or heating sleeves to prevent sensor blockage or measurement interference from condensation.

3. Regular Calibration: Calibrate every 6 months using a standard vacuum generator (e.g., McLeod gauge). Replace sensors or adjust zero points if errors exceed ±5%.

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III. Typical Faults and Maintenance

1. Reading Fluctuations: Check grounding quality (ground resistance ≤4Ω) to eliminate electromagnetic interference. If fluctuations sync with pump speed, inspect for pump leaks.

2. **Zero Drift Perform a "zero reset" after long-term shutdowns to avoid sensor memory effects. Replace aging components if drift persists.

3. Display Abnormalities: Verify power supply voltage (typically 24VDC ±10%) and signal cable shield grounding to rule out power interference or signal attenuation.