Ultrasound Daily maintenance
(1) Temperature, humidity, pressure
> The room is best equipped with a wet and dry thermometer.
> Temperature limit: 5-40 degrees Celsius in the power-on state, and the best working temperature is about 25 degrees. Not turned on state -40-55 degrees. It is best to be equipped with air-conditioning equipment.
> Humidity limit: 30%-80% in power-on state, 30%-93% in non-power-on state. It is required that the instrument is generally not placed on the ground floor, and it is better to be equipped with a dehumidifier to dehumidify regularly. Try not to mop the floor with a wet mop. (Be careful if there is a sink in the room)
Pressure limit: 70-106KPa when switched on, 50-106KPa when not switched on
(2) Power supply
> The input power supply voltage is limited to 198V-242V.
> It is best to equip a professional high-precision stabilized power supply, do not use cheap household-type stabilized power supply, its various indicators can not be reached, such as instant response time, ripple coefficient, surge voltage, etc.
> Generally, there is the power value of the equipment on the nameplate on the back cover of the instrument. Multiply this value by 1.5-2.5 times the power of the regulated power supply.
If you want to equip UPS power supply, it is best to be online, do not use backup UPS power supply (cheap household type). Some old-fashioned UPS power supplies have no voltage stabilization function and output non-sine waves, but square waves, and some devices are not supported. (Can be directly connected to a 100-watt light bulb, see if there is flicker)
> The stabilized power supply has pointer or digital display, please check it frequently to avoid accidents.
(3) Grounding requirements
> The role of grounding is mainly divided into three categories: protective grounding, system grounding, and anti-interference grounding. Protective grounding is to introduce leakage current into the earth. System grounding means that the machine must be grounded to work. Anti-interference grounding is just what the name suggests.
> The anti-interference grounding method mainly includes one-point grounding (common ground) and multiple grounding. In general, low-frequency electronic equipment uses one-point grounding, and high-frequency electronic equipment uses multi-point grounding.
> Be sure to connect the ground wire when using medical equipment. The ground wire should be in good contact with the earth. It cannot be simply connected to the water pipe, heating pipe or metal doors and windows. Because the heating pipe is not connected to the earth, the joints of the water pipes are coated with insulating paint to make it sealed. Some tap water pipes use plastic joints, etc. If the ground wire is connected to it, not only the purpose of protection will not be achieved, but it will cause serious interference and increase insecurity.
> For medical equipment, the grounding resistance should be close to 4Ω, and the smaller the grounding resistance, the smaller the leakage current. Generally, the leakage current of the medical equipment shell must be less than 300uA, the leakage current of the cardiac catheter electrode or pacemaker electrode and other internal equipment should be less than 10uA, and the leakage current of the patient lead wire must be less than 50uA. In order to reduce the grounding resistance, the diameter of the ground wire should be thick and not too long. The installation of the ground wire must meet the technical requirements.
> Operators or engineers should always check the grounding of each equipment, and those with poor contact should be dealt with in time. Low-frequency medical electronic equipment should use common grounding, and high-frequency signal equipment should be grounded at multiple points. (Each grounding point requires digging a hole of more than 1 meter, burying a copper plate with a length of not less than 20cm, a width of not less than 20cm, and a thickness of 0.5cm, which is led out with a thick wire.
> If the hospital has a uniform ground wire, you must use a three-phase plug, a three-phase socket, and a three-phase patch panel.
(4) Prevent external interference
> Do not have high-power electronic equipment, high-frequency transmitters, radio-frequency treatment devices, etc. around the room.
> Do not have mobile, Unicom base stations, antennas, etc. on the roof.
> If there are more than two color Doppler ultrasound, the distance should not be too close.
> It is best not to collinear with other large equipment in the hospital.
> The qualified units shield the entire room when decorating the room.
> Spray anti-static spray on carpets and linoleum.
> Lay anti-static mats.
> Connect a ground wire between the machine and the examination table.
