Heat Treat/Vacuum Furnace

Heat treating environments can be problematic for sensitive instrumentation like vacuum gauges and sensors because contamination isn’t just a risk, it’s a given. For over 80 years, Televac has been a preferred supplier of high performance vacuum gauges to the heat treat and vacuum furnace industry because our extensive line of vacuum sensors, active gauges, and controllers deliver world-class vacuum measurement for demanding environments. Talk to one of our engineers today about our 7B Penning magnetron cold cathode sensor, thermocouple sensors, convection sensors, and our MX200 vacuum controller with EthernetIP communications which interfaces directly with Rockwell Automation Allen-Bradley PLCs.

Courtesy of Solar Atmospheres

Cold Cathode Technology

  • Penning magnetron vs competing inverted/double inverted magnetron cold cathodes
  • Contamination resistant Penning magnetron cold cathode technology
  • Cleanable cold cathodes for extended gauge life (bead blasting or abrasive pad cleaning)
  • Simple gauge disassembly and cleaning for extended life and lower maintenance costs

Contamination Resistance

  • Pirani, thermocouple, convection technologies (thermal conductivity gauges)
  • Macro vs micro (MEMS) sensors for contamination resistance
  • Feedback from customers: MEMS (micro) sensors are more susceptible to contamination, particularly in heat treat/vacuum furnace applications
  • Requires more frequent calibration and replacement (additional cost)
  • MEMS sensors are often active gauges and include electronics, adding to replacement costs

Digital calibration

  • Historically all calibration is analog – done with potentiometers (pots)
  • Gauges and controllers with display
    • Allows calibration at gauge instead of needing multiple people at gauge/display or additional equipment
  • Digital calibration – via digital communications
    • EtherNet/IP, RS-232, RS-485, among others
    • Prevents mismatch between HMI and display
    • Allows for integration of calibration into PLC HMI

Active Gauge Solutions for Nadcap/AMS 2769/Aerospace Certification

To maintain Nadcap accreditation and comply with the requirements outlined in AMS 2769, rough vacuum gauges must be annually (once every year) calibrated to a NIST traceable standard, whereas high vacuum gauges (cold cathodes) require quarterly (once every 3 months) calibration. Active gauges greatly simplify this process by allowing you to return an individual active gauge for calibration without removing any cabling or other equipment from your system.


Active Gauge Solution

MX4A Convection Active Gauge

• 1×10-4 Torr to 1000 Torr
• Sensors easy to replace
• Contamination resistant

MX7B Cold Cathode Active Gauge

• 1×10-3 Torr to 1×10-8 Torr
• Robust and highly resistant to contamination
• Simple to disconnect sensor from electronics
• Multi-color OLED display with full menu functionality

MX Active Gauge EthernetIP Gateway

• Connect up to (4) Televac MX active vacuum gauges and (1) CDG
• Interface directly with Rockwell Automation® Allen-Bradley® PLCs
• Faster and more reliable vacuum measurements
• Eliminates the need for additional analog-to-digital converters

Controller Solution

MX200 EthernetIP Vacuum Controller

• Seamless integration with Allen-Bradley PLCs
• All features accessible through the front panel and through digital communications
• Control up to 10 sensors, display up to 8
• User-configurable analog 0 to 10 V DC output ranges

4A Convection Vacuum Sensor

• Atmosphere to 1×10-3 Torr
• Fast response time
• Contamination resistant
• ±10% accuracy

7B Penning Magnetron Cold Cathode Vacuum Sensor

• 1×10-7 Torr to 1×10-3 Torr
• Robust and highly contamination resistant
• Easy to disassemble and clean