Diaphragm Pump Design
The design principles of KNF diaphragm gas pumps contain two important characteristics for process engineering:
1. The pumped media is not subjected to contamination.
2. Diaphragm pumps exhibit a high level of gas tightness.
Diaphragm gas pumps have become standard for many analytical applications. Based on their design, they operate without lubrication and, therefore, cannot contaminate the medium. For analysis of hot gases, it is also critical that the gas sample temperature remain constant. Otherwise, the constituent parts could condense out, leading to inaccurate results.
Avoiding Condensation of Gases
Process engineering and chemical analysis both depend on the ability to transfer hot gases and vapors. KNF diaphragm pumps with temperature-resistant components -- able to withstand up to 460 °F (240 °C) -- are ready to handle these challenges. However, temperature resistance alone is not enough in many applications. In these cases, it is equally important for the temperature of the medium to remain constant during the transfer process. KNF diaphragm gas pumps with insulated temperature-resistant, and heated heads provide the solution to this problem.
Insulation of the Pump Head - An Ingenious Solution
There are two important requirements for the temperature-resistant pump:
1. Homogenous temperature distribution throughout the entire pump head in order to prevent cold spots and condensation.
2. Minimal heat emissions into the ambient air to avoid significantly elevated temperature in the analysis cabinet.
For these purposes, patented insulation fully encapsulates the pump head in the form of a removable cover. The insulation has four layers: First, air provides insulation directly at the pump head. This enables contact-free assembly, and convenient cover removal. Next, comes an inner hood made of stainless steel whose surface reflects heat radiation, thereby ensuring homogenous distribution of temperature in the pump head. The third layer is a fiberglass fleece, protected by a plastic hood, which is the fourth and final layer.