A combination of - a portable monitoring device for remotely monitoring a medical device for use in hospitals and the like and having a signal receiver for receiving a first wireless signal, and - said medical device in the form of a portable drip infusion set of the type comprising a liquid supply, a drip chamber downstream of said liquid supply for forming liquid drops, a flexible tube connecting said drip chamber with an injection needle and a signal emitter for emitting said first wireless signal, - wherein said monitoring device and said medical device comprise first and second sets of electrical contacts (11, 11a), respectively, for mutually electrically interconnecting said monitoring device and said medical device for transmitting electronic data and/or electrical power between said monitoring device and said medical device, and - wherein said medical device comprises programming means (6, 7, 8) such as a push button, a switch, a keyboard, a data transmission receiver, a data input port or the like for programming first electronic circuitry controlling the function of said medical device, characterised in that said first electronic circuitry comprising blocking means for blocking said programming function of said programming means when said monitoring device is not electrically connected to said medical device through said first and second electrical contacts, wherein - said monitoring device comprises: a first housing, a signal receiver for receiving a first wireless signal, a first timing device for measuring a first time interval, preferably 30 seconds, an alarm device for emitting a first alarm, second electronic circuitry interconnecting said signal receiver, said first timing device and said alarm device for causing said alarm device to emit said first alarm if said first signal is not received by said signal receiver at the end of said first time interval, and a first battery for providing electric energy to said signal receiver, said alarm device and said timing device, and - said medical device comprising: a second housing, a signal emitter for emitting said first wireless signal, a second timing device for measuring said first time interval, third electronic circuitry interconnecting said timing device and said signal emitter for causing said signal emitter to emit said first signal at the end of said first time interval, and an electric power supply, preferably a second battery, for providing electric energy to said timing device and said signal emitter. - a portable monitoring device for remotely monitoring a medical device for use in hospitals and the like and having a signal receiver for receiving a first wireless signal, and - said medical device in the form of a portable drip infusion set of the type comprising a liquid supply, a drip chamber downstream of said liquid supply for forming liquid drops, a flexible tube connecting said drip chamber with an injection needle and a signal emitter for emitting said first wireless signal, - wherein said monitoring device and said medical device comprise first and second sets of electrical contacts (11, 11a), respectively, for mutually electrically interconnecting said monitoring device and said medical device for transmitting electronic data and/or electrical power between said monitoring device and said medical device, and - wherein said medical device comprises programming means (6, 7, 8) such as a push button, a switch, a keyboard, a data transmission receiver, a data input port or the like for programming first electronic circuitry controlling the function of said medical device, characterised in that said first electronic circuitry comprising blocking means for blocking said programming function of said programming means when said monitoring device is not electrically connected to said medical device through said first and second electrical contacts, wherein - said monitoring device comprises: a first housing, a signal receiver for receiving a first wireless signal, a first timing device for measuring a first time interval, preferably 30 seconds, an alarm device for emitting a first alarm, second electronic circuitry interconnecting said signal receiver, said first timing device and said alarm device for causing said alarm device to emit said first alarm if said first signal is not received by said signal receiver at the end of said first time interval, and a first battery for providing electric energy to said signal receiver, said alarm device and said timing device, and - said medical device comprising: a second housing, a signal emitter for emitting said first wireless signal, a second timing device for measuring said first time interval, third electronic circuitry interconnecting said timing device and said signal emitter for causing said signal emitter to emit said first signal at the end of said first time interval, and an electric power supply, preferably a second battery, for providing electric energy to said timing device and said signal emitter.