CS Instruments 0699.0515 (FA 515) is a high‑precision, long‑term stable dew point sensor for residual moisture measurement in compressed air and non‑corrosive gases, featuring a measuring range of -80 to +20 °Ctd, 4…20 mA analogue output, Modbus‑RTU interface, IP66 protection, and pressure resistance up to 500 bar for industrial and hazardous area applications。