Siemens 186-0043 HUMIDITY TRANSMITTER, ROOM, DA, 1-PIPESiemens 186 0043 This 186 Room Humidity Transmitter is an one pipe, direct acting pneumatic instruments that sense space humidity and transmit a 3 to 15 psi pneumatic signal to a remote receiver gauge and or receiver controller to read percent relative humidity. This transmitter has a 20 to 80 percent relative humidity, an outlet pressure of 3 to 15 psi, and is wall terminal mounted. This transmitter has a cover and the air velocity must be at least