Another solution to using multiple transducers with one readout is to use a scanner instead of meter and a switch. There are many types of scanners. The type of scanner that works with multiple pressure transducers must have independent scaling on each channel. Some scanners, besides having independent scaling on each channel, also offer independent current, voltage, or millivolt inputs to each channel. These types of scanners enable you to use transducers with different outputs as well as different pressure ranges with the same instrument.
Most instrumentation is set up to receive voltage.
A commonly asked question is how to use a current signal with instrumentation set up for voltage. This is simply done by installing a resistor across the input terminals of the instrumentation. This is shown in Figure 7. The only other consideration is the zero offset. Since most current loops have a low end of 4 mA, there will be a zero offset.