How to Measure Two Atmospheric Pressure Levels With Transmitters

1). Decide on the operating range of the required transmitters. This includes the temperature, humidity and accuracy of measurement as well as the pressure range to be measured. The two transmitters must have the same pressure range and identical outputs so that they use one readout device. Ensure all wiring conforms to local and national electrical and safety codes and that the power supply is sufficient to power both transmitters.
2). Use the pneumatic connector and fittings to install the transmitters in the two locations where you need to make a pressure measurement. The transmitters are contained in casing that can be mounted on a wall. Ensure that there is a location where the sensor could be protected from any condensation and is visible and accessible. Protect the sensor from wind as this could introduce transient pressure changes. Ensure that the sensor is pointing downward to prevent any condensation accumulating in the pressure cavity. Seal the wall connections with silicone sealant.
3). Ensure that the power supply is switched off prior to any connection. Remove warning labels from the wiring attached to the sensor. Ensure the power supply cable connection is clean and dry. Open the transmitter housing cover and connect the power supply to the two transmitters in series. Connect each of the transmitters to a common selector switch. Connect the selector switch to the recorder and computer. The transmitters are ready for use when the DC power supply is switched on.