Symptom: vacuum pump, electromagnetic gauge negative pressure, no negative output terminal. Cause Troubles: First check whether the water tank in a secure location. Tank level is not a safe place, under normal circumstances, a "boil", generate a lot of heat, ward equipment belt, hand feeling hot water tank, a small amount of water can not be produced by the heat pump out, resulting in a small amount of water in the tank to heat up quickly. Less water, poor sealing, can not achieve the water cycle, does not produce enough of the negative pressure of the negative pressure less than the set value, the vacuum pump has been working with the device, resulting in rapid heating a small amount of water, a "boil." Open water, into the water tank, reducing the temperature of the vacuum pump work. 1, the device with the use of high-strength aluminum alloy material, the whole painting process, looks beautiful, wear-resistant, easy to clean; 2, equipment with panels and side panels of color can choose and hospital ward wall color customized; 3, devices with a gas pipeline is 100% air tightness test, three-chamber devices with oxygen, is secure; 4, according to user requirements with equipment, Ericsson treatment with manufacturers to configure the British standard, German standard, American Standard and GB etc. gas terminal socket; 5. equipment with electrical devices can be assembled according to user requirements, including English, Metric and other power switches and sockets; also optional call, intercom and other panels, or according to the hospital need to set aside the mounting holes. Medical devices with | devices with | Hebei Hebei Ericsson Ericsson is provided by medical Engineering Co. Ericsson Hebei Medical Engineering Co., Ltd. (www.hslixin.com) strong, credible, Hengshui in Hebei medical device manufacturing equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Hebei Ericsson and you hand into the brilliant, for a better future!