InstruTech Busy Bee Pirani Capacitance Series PCM301

InstruTech “Busy Bee” PCM301 Pirani-Capacitance Vacuum Gauge Module

The InstruTech PCM301 “Busy Bee” is a versatile, all-in-one vacuum gauge module combining a Pirani sensor and a ceramic capacitance diaphragm sensor to deliver accurate pressure readings from approximately 3.8 × 10⁻⁵ Torr up to 1,125 Torr to cover rough through atmospheric pressure regimes. Its dual-measurement design ensures reliable, gas-independent venting above 7.6 Torr—ideal for safe, mixed-gas environments. :contentReference[oaicite:0]{index=0}

Why the Busy Bee Stands Out

• Ultra-wide pressure range: 3.8 × 10⁻⁵ to 1,125 Torr (5 × 10⁻⁵ to 1,500 mbar)—from medium vacuum to above atmosphere. :contentReference[oaicite:1]{index=1}
• Gas-independent readings: Above ~7.6 Torr, diaphragm sensor delivers accurate pressure regardless of gas type—perfect for safe venting. :contentReference[oaicite:2]{index=2}
• Complete integrated design: Built-in backlit display, log-linear analog output, two setpoint relays, optional atmospheric vent switch, all in one module. :contentReference[oaicite:3]{index=3}
• Field-replaceable, pre-calibrated sensor: Each module carries onboard calibration data for fast, accurate deployment. :contentReference[oaicite:4]{index=4}
• Mounts in any orientation: Flexible installation simplifies integration into tight or unconventional spaces. :contentReference[oaicite:5]{index=5}
• Durable and compliant: CE and RoHS certified with a robust build and 2-year warranty. :contentReference[oaicite:6]{index=6}

Technical Overview

• Measurement Range: 3.8 × 10⁻⁵ to 1,125 Torr (equivalent to 5 × 10⁻⁵ to 1500 mbar / 5 × 10⁻³ to 150 kPa). :contentReference[oaicite:7]{index=7}
• Accuracy (N₂, typical):
  • 3.8 × 10⁻⁴ to 7.6 × 10⁻⁴ Torr: ± 50%
  • 7.6 × 10⁻⁴ to 75 Torr: ± 15%
  • 75 to 715 Torr: ± 5%
  • 715 to 790 Torr: ± 2.5%

  :contentReference[oaicite:8]{index=8}

• Repeatability: ± 2% from 7.6 × 10⁻⁴ to 825 Torr. :contentReference[oaicite:9]{index=9}
• Analog Output: Log-linear 0–8 V DC (1 V per decade). :contentReference[oaicite:10]{index=10}
• Setpoint Relays: Two solid-state SPDT relays (≤ 30 V DC, ≤ 0.3 A). :contentReference[oaicite:11]{index=11}
• Response Time: < 30 ms. :contentReference[oaicite:12]{index=12}
• Power: 15 to 30 V DC, ≤ 2.5 W; protected against reverse/transient voltages. :contentReference[oaicite:13]{index=13}
• Fitting Options: 1/8″ NPT, NW16/25 KF, Mini-CF, 4VCR, 8VCR. :contentReference[oaicite:14]{index=14}
• Internal Volume: Small internal volume (4.7–8 cm³ depending on fitting) for fast pump-down. :contentReference[oaicite:15]{index=15}

Typical Use Cases

• Vacuum ovens and coating systems where medium vacuum to atmospheric vent control is required.
• R&D and analytical labs needing reliable, broad-range pressure monitoring without gauge swaps.
• OEM systems needing compact instruments with built-in display and control logic.
• Safe venting setups—gas-independent above ~7.6 Torr ensures compatibility with various venting gases.

Integration Tips

• Use analog output directly for PLC, SCADA, or DAQ systems.
• Program setpoint relays for process interlocks—e.g., vent thresholds or alarms.
• Replace sensors easily in field with pre-calibrated module—reduces downtime.
• Install in any orientation—especially helpful in compact OEM builds.

Frequently Asked Questions

Does the Busy Bee require a separate controller?

No. The Busy Bee contains integrated electronics, display, outputs, and relays—making it a standalone module. :contentReference[oaicite:16]{index=16}

Is the measurement gas-dependent?

Only below 7.6 Torr—use the Pirani section. Above that, it relies on the capacitance diaphragm sensor, which is gas-independent for accurate vent control. :contentReference[oaicite:17]{index=17}

Can I mount it any way?

Yes—it’s designed for installation in any orientation without affecting readings. :contentReference[oaicite:18]{index=18}

Why Buy from High Vac Depot?

High Vac Depot brings deep expertise in vacuum measurement technology—from rough vacuum to UHV solutions. We’ll help you match the Busy Bee with your system, compare it against alternatives like the Televac 4A or CC10, and help integrate it into your control logic or vacuum stack for optimized performance.

Get Expert Help or a Quote

Looking to upgrade or integrate the Busy Bee module? Contact High Vac Depot—we’ll assist with sensor selection, installation guidance, or tailored pricing.

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Additional information

Brand

InstruTech

InstruTech is a Colorado, USA based company specializing in the design and manufacture of vacuum measurement and control instrumentation.

• InstruTech Busy Bee Pirani Capacitance Gauge PCM301 Data Sheet
• InstruTech Busy Bee Pirani Capacitance Gauge PCM301 User Manual

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