Tecfluid APTM44 User Manual
Page 2
Cod.:E-MI-2152004I / Rev.: 1
2
1
WORKING PRINCIPLE
The amplifier for the TM-44 is designed to avoid problems of electrical interferences in
installations where the turbine is located at a big distance from the electronic control equipment.
The turbine pick-up generates very low level pulses (in the mV range). Given that the instrument
input must detect these low level pulses, it is very susceptible to electrical interferences, especially to
mains interferences. The probability of being affected by interferences increases with the length of the
cable between the pick-up and the instrument.
The APTM44 amplifier converts the pulses from the turbine pick-up into two TTL level signals
which are out of phase. This output signal is compatible with the pick-up input circuit of Tecfluid
instruments and it appreciably increases the rejection of interferences which can be picked up by a long
cable.
2.1 Limitations
The maximum frequency should be less than 1500 Hz.
2.3
Applications
a). The elimination of interferences in long cables between the turbine and the control
instrument.
b). Signal conditioning for instruments not provided with a pick-up input. One of the TTL outputs
can be used as an input for an industrial robot etc.
c). For connecting two or more pick-up input instruments to the same turbine.
3
INSTALLATION
The APTM44 is housed in an IP40 plastic case for mounting inside an electrical control panel.
The case has a clip for mounting on DIN 46 277 or DIN EN 50 022 rails.