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The electrode system of ZJ-12 (DL-7) super high vacuum ionization gauge (usually called B-A gauge) has the features of compact design, simple structure, small volume, low power consumption, easy for exhaust, stable and reliable measuring, wide measuring range, etc.
Structure Type: adopts DM-30 glass cover (connection size is φ19+-0.2mm) or glass-metal sealing; the other type adopts DN35C flange (naked gauge).
Major Technical Specifications:
| Type | ZJ-12 (DL-7) | | Measuring Range | 1*10-1~5*10-8Pa | | 1*10-3~5*10-10mbar | | 0.75*10-3～3.75*10-10Torr | | Gauge Constant | 7.5 *10-2Pa-1+- 20 % | | 7.5 *10-4mbar-1+- 0.2 % | | 5.6 *10-4Torr-1+- 0.2 % | | Roast Temperature | 400℃ (Max.) | | Electron Bombardment Exhaust | Max Power to be 30 W | | Operation Parameters: | | | Above Earth Potential of Accelerating Electrode | 200 V | | Above Earth Potential of Cathode | 50 V | | Above Earth Potential of Collecting Electrode | 0 V | Note:
1. Check vacuum degree to be no less than 5*10E-2Pa before unsealing.
2. Install as vertical as it can.
3. Keep in vacuum condition for long time unuse of the naked gauge to avoid electrode from oxidation.
4. Vacuum degree should be higher than 1*10E-3Pa in case of gauge exhaust.
For better ultimate vacuum degree, the gauge must be roasted together with the system.
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Vacuum Components 
