Select suction pressure transducers with a voltage output for measuring suction range pressures. These transducer have ranges from a few millibars to 1 bar (15 psi) to cover any full scale range from ambient zero pressure to max suction pressure. Use these transducers to generate an output signal from 0 to 5/10Vdc which varies linearly with applied suction pressure.
DPS Low Differential Pressure Transmitter - Ultra low differential pressure transmitter for HVAC applications with 4-20mA current loop or amplified voltage output signal in pressure ranges from 0.1 mb up to 1 bar differential. 
DMP331P Hygienic Flush Pressure Transmitter - Sanitary pressure sensor wth exposed diaphragm with no crevices for high temperatures up to 300 Degrees Celsius in ranges from 100mb up to 40 bar gauge or absolute
- High resolution minus 150 mbar range pressure transducer
- -50 to +50 mbar g compound range 0-10 volts output pressure sensor
- -20 to 20 inH2O g compound range 0-10Vdc output air pressure sensor for oem use
- Minus 14 psi gauge suction range 0 to 5 volts output pressure sensor
- 20 kPa negative differential range air pressure gauge and sensor with tubing fitting