Operation

5.11The Care of a Trap When using a cold trap the refrigerant should be maintained at a high level in the flask to keep the trap at a uniformly low temperature. If the trap is rewarmed it may allow re-evaporation of the condensate. The refrigerant add tube on the liquid nitrogen trap should not be obstructed as the refrigerant boil-off can pro- duce dangerously high pressures. If the trap becomes saturated it should be disconnected from the system, drained, and cleaned. An increase in pressure in the vacuum system will normally indicate that the trap has become saturated. To clean the trap, remove the trap from the system and allow the trap to warm up and rinse off the condensate with a suitable solvent in a fume hood. Thoroughly clean and dry the trap before reinstalling into the system.

Section 06

6.10Starting AWelch Pressure/Vacuum Pump Before attaching the pump to a system, familiarize yourself with the function and action of the pressure/vacuum pump that you have acquired. Review the power requirements as described in Section l-6. Welch recommends running the pump for a few minutes to warm it up, before use. The warm-up improves the pumps ability to handle humid air.

6.11Cleanliness Take every precaution to prevent foreign particulates from entering the pump. Particulates will damage the pump’s performance. If you find that particulates come off the process during evacuation, a particulate trap in the foreline will work. A simple, inexpensive trap may be made by placing glass wool in a glass or plastic tube. Screens must be inserted to hold the glass wool in place.

6.20LEAKDETECTION The importance of eliminating all leaks in a vacuum system is obvious. The pump must remove this added volume of leaked gas to maintain the desired vacuum. Leaks for these pump can be located by slightly pressuring the system and painting the suspected area with a thick soap solution. Escaping air will produce soap bubbles.

6.30OPERATINGPRESSURERANGE Pressure/Vacuum pumps are designed to be run from slightly below atmospheric to their maximum vacuum level on the intake side. The pumps also may be run from atmospheric to their maximum rated pressure rating. Consult the Specification Table (See Section VI, Specifications) for the ratings of your specific model.

6.40SHUTDOWN PROCEDURES After use, Welch recommends the pump be run for about 2 minutes disconnected from the vacuum process. The air pumped through the mechanism will purge out water vapor or droplets of water condensate that may have formed on the inside of the pump. This purge of the pump mechanism helps prevent corrosion.

Section 07

MAINTENANCE

Welch dry pressure\vacuum units are 100% oil-free. The pump employs a non-lube piston and cylinder. No maintenance is necessary for the bearings. All bearings are sealed and permanently lubricated. Lubrication should not be attempted. The units are built for continuous duty operation with the quietness and durability of a diaphragm, but with piston performance.

2546, 2534C-02 specifications

Fisher & Paykel has long been recognized for its innovative kitchen appliances, and the 2534C-02 and 2546 models are excellent examples of this tradition. Designed with precision and an understanding of contemporary cooking needs, these appliances promise to enhance any culinary experience.

The Fisher & Paykel 2534C-02 is a freestanding gas cooker that features a sleek and modern design, making it an attractive addition to any kitchen. It offers a generous cooking capacity with four powerful burners, providing versatility for various cooking tasks, from boiling to sautéing. The burners are equipped with a high-performance design to ensure even heat distribution, allowing chefs to achieve consistent cooking results. One of the main highlights of this model is its intuitive interface, which makes it easy to control temperature settings precisely.

In contrast, the Fisher & Paykel 2546 is an advanced double oven model that caters to both convenience and efficiency. It features a spacious interior, allowing users to cook multiple dishes simultaneously, which is perfect for family gatherings or entertaining guests. The ovens are designed with Smart Oven technology, which includes precise temperature control and a variety of cooking modes, such as baking, roasting, and broiling. This technology ensures even cooking results, eliminating the guesswork often associated with traditional ovens.

Both models emphasize energy efficiency and sustainability, incorporating features designed to minimize energy consumption without compromising performance. The exterior is crafted from durable materials, providing a stylish yet functional aesthetic that complements modern kitchen décor.

Another attractive feature of the Fisher & Paykel 2534C-02 and 2546 is their easy-clean design. The surfaces are engineered to resist smudges and stains, making maintenance a breeze. In addition, the interiors of the ovens boast self-cleaning capabilities, allowing users to spend less time scrubbing and more time enjoying their culinary creations.

In conclusion, Fisher & Paykel's 2534C-02 and 2546 models combine functionality, innovative technology, and aesthetic appeal. They cater to a wide range of cooking needs, making them suitable for both amateur cooks and seasoned chefs alike. With their commitment to quality and performance, Fisher & Paykel continues to set the standard in modern kitchen appliance design.