 |
| Cold cathode ionization gauge |
Cold cathode discharge gauges are an economical and durable alternative to hot filament ionization gauges in the high vacuum pressure regime. With no active components such as hot filaments, the discharge gauge is not destroyed in sudden or prolonged high pressure gas exposures. This feature and the relative simplicity of the gauge promotes its use in evaporation systems, heat treatment applications and plasma processing environments.
Thermionics offers two types of discharge tubes and a wide variety of connections to new and existing vacuum systems. The choice between the two gauges is based on the anticipated frequency of high pressure exposures and the nature of the residual gases in the vacuum. While these exposures will not often ruin the gauge, some deposition of foreign material may occur on the internal electrodes. To prevent a cumulative degradation in tube performance, the electrodes may be removed and cleaned. This significantly prolongs the lifetime of the gauge operation, but is usually not a problem under typical vacuum environments. Thermionics offers a standard unit (DG-7) for typical operation and an additional unit with an easily removable anode assembly (DG-8) for the more austere applications.
Features
2 gauge models and compatible control model
Self cleaning, minimum maintenance
Rugged, all welded construction
With or without O-rings or gaskets on standard models
Viton® O-ring on removable anode model
Long, uninterrupted service life
Small size
Connectable to glass or metal systems
Ordering Information
| Model No. | Description | Price |
|---|
| DG-7 | Standard tube with stainless steel (SS304) envelope, all welded construction and terminated with 3/4" tubulation. Bakeable to 250°C. | $315. |
| DG-8 | Same anode configuration as DG-7 except O-ring assembly ring allows for removal of the anode for inspection and cleaning. Bakeable to 150°C (Viton® limit). | $350. |
Additional Terminations
| Suffix | Description | Additional Price |
|---|
| -1/2SS | 1/2" stainless steel tubulation | NC |
| -CF | 3/4" tubulation with 2-3/4" ConFlat flange connection | $60. |
| -QD | 1/2" tubulation to quick-disconnect fitting | $40. |
| -KF | 3/4" tubulation to KF-40 fitting | $60. |
| -1/2G | 1/2" glass tubulation | $100. |
To Order: For example, to order a discharge gauge with an O-ring anode assembly for connection to a KF fitting, the following number would be specified: DG-8-KF.