Welch’s ProBoost is an air cooled gas jet pump (commonly called a diffusion pump). The gas jet is formed by directing boiling silicone vapors thru a hollow cone. Since there are no internal moving parts, the pump is very simple. The pumping action commences when the vacuum pressure goes below 0.2 Torr (200 millitorr). On an empty, leak free system, ProBoost backed by a rotary vane pump lowers the vacuum pressure to 0.00002 Torr (20x lower in pressure than a 2‐stage rotary vane pump can do alone).
Automated shutdown process works through an embedded control board that disables heater and enables fan during shutdown.
| Specs | Model 1392 |
| Maximum Pumping Speed, Air | 80 liters/sec |
| Ultimate Vacuum Pressure | 0.00002 torr |
| Minimum Backing Pump FAD@60Hz | 3 CFM |
| Maximum Discharge Pressure | 0.2 torr |
| Heat‐up time | 7 minutes |
| Inlet Connection | NW50 |
| Silicone Oil Capacity* | 25 mL |
| Cool down time | 20 minutes |
| Pump dimensions: L x W x H | 5.5 x 5.4 x 7.5 in |
| ProBoost weight lbs (kg) | 5.6 lbs (2.5 kg) |
*ProBoost comes with NW50 clamp, NW50 centering ring, NW25 clamp, NW25 centering ring, line cord, cooling fan, switch, and 100 ml of Welch ProBoost Silicone Oil, Cat. No. 1391K. Pump connection kit is required to connect a ProBooster to a rotary vane pump.
Usage Description Consists Of Cat. No.
| Usage | Description | Consists Of | Cat. No. |
| Connects ProBooster to CRVpro 4,6,8, 16, 24 and 30 |
Components needed to connect to rotary vane pump and neck booster inlet to NW25 |
(1)180° NW25 SS return, (2) SS NW25 centering ring assemblies, (2) NW 25 hinge clamps; (1) conical reducer NW25 to NW50 |
1392K‐01 |
| Closes off ProBoost prior to releasing vacuum to still |
Stainless Steel high vacuum butterfly valve | Very high conductance NW25 valve with quick open and close | 704523 |
| Alternative to rubber hose** |
Flexible metal hose, 19.7 in | Accordian metal tubing with NW25 flanges to connect ProBoost to Still | 710762 |
