1 Description
Historically, the 2A Thermocouple Vacuum Gauge had a measurement range up to only 20 Torr, and the 4A Convection Vacuum Gauge was used to measure pressures up to 1000 Torr. Software and drive signal enhancements incorporated into the MX2A Thermocouple Active Vacuum Gauge now allow the 2A Thermocouple Vacuum Gauge to measure pressures up to 1000 Torr. This has raised questions about the differences between the MX2A Thermocouple Active Vacuum Gauge and the MX4A Convection Active Vacuum Gauge, as almost all their specifications are now identical. This application note outlines the differences between the two active vacuum gauges.
Back to Table of Contents2 Differences Between the MX2A and MX4A
| Description | MX2A | MX4A |
|---|---|---|
| Sensor Type | Thermocouple | Convection |
| Filament Diameter | Thicker | Thinner |
| Contamination Resistance | Higher | Lower |
| Response Time | < 2 seconds | < 1 second |
| Accuracy | ±30% (10 to 100 Torr) | ±10% (10 to 100 Torr) |
| Materials Exposed to Vacuum | NiMnSi Alloy, CuNiMn Alloy | NiCr Alloy, CuNi Alloy |
| Cost | Low | Lowest |
All other specifications for the MX2A and MX4A are equivalent.
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