Industrial vacuum furnaces use different instruments to monitor chamber pressure, gas supply, cooling water, and auxiliary systems.
Understanding the function of each instrument helps equipment manufacturers prepare a suitable instrumentation list.
1. Vacuum Gauge
The vacuum gauge measures pressure inside the furnace chamber during evacuation and vacuum processing.
Common technologies include:
Pirani gauges
Capacitance diaphragm gauges
Combination vacuum gauges
The selection depends on the required pressure range, accuracy, and gas composition.
2. Pressure Transmitter
Pressure transmitters are commonly used for higher-pressure gas and utility systems.
Typical applications include:
Gas backfill pipeline
Compressed gas supply
Pressure control systems
Auxiliary equipment
Cooling or pneumatic systems
The transmitter range and pressure rating must match the actual operating conditions.
3. Water Flow Switch
Cooling water is important for equipment such as furnace cooling jackets, heat exchangers, and selected pump systems.
A water flow switch can detect flow below a defined threshold and provide an alarm or interlock signal.
Selection should consider minimum required flow, pipe diameter, water temperature, pressure, and output type.
4. Additional Instruments to Consider
Depending on the furnace design, the instrument list may also include:
Temperature sensors
Cooling water temperature sensors
Pressure switches
Level switches
Valve position feedback
Gas flowmeters
5. Prepare an Instrument List
| Instrument | Main Function | Typical Location |
|---|---|---|
| Vacuum gauge | Monitor chamber vacuum | Furnace chamber |
| Pressure transmitter | Monitor gas pressure | Backfill and utility lines |
| Water flow switch | Detect cooling water interruption | Cooling water pipeline |
| Temperature sensor | Monitor process temperature | Furnace and cooling system |
| Flowmeter | Measure gas or liquid flow | Supply pipeline |
Conclusion
Vacuum gauges, pressure transmitters, and water flow switches perform different functions in vacuum furnace systems.
The final instrument list should be prepared from the furnace process design, P&ID, control requirements, and equipment manufacturer’s specifications.
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