S230/S231 Dew Point Transmitters for Ex Applications Technical Data Stated accuracy under following conditions: • Ambient temperature 23 °C ±3 °C • Process temperature 23 °C ±3 °C • Ambient humidity < 95 %, no condensation • Airflow > 2 l/min at sensor tip Measurement Dew Point Accuracy ± 1 °C Td (0 ... 20 °C Td) ± 2 °C Td (-60 ... 0 °C Td) ± 3 °C (-100 ... -60 °C Td) Selectable units °C, °F, bar(g), MPa(g), psi(g), % rH, g/m³, mg/m³, G/m³ atm., mg/m³ atm., ppm(v), g/kg, °C Td atm. Measuring range (model depending) S230: -100 ... +20 °C Td S231: -50 ... +20 °C Td Sensor Polymer + QCM Response time t90 (@ 4l/min) -20 °C Td -> -60 °C Td = < 240 sec -60 °C Td -> -20 °C Td = < 30 sec Temperature Accuracy 0.3 °C Measuring range -30 ... +70 °C Sensor NTC Reference conditions Selectable conditions Pressure Dew Point, Atmospheric Dew Point General data Configuration PC Software S4C-DP Application Material Process connection Stainless steel 1.4301 (SUS 304) Housing Aluminium alloy Sensor Polymer, Ceramic Miscellaneous Electrical connection Screw terminals Protection class IP67 Approvals II 2G Ex db ib IIC T4 Gb II 2D Ex ib tb IIIC T135°C Db CE Process connection G 1/2“ thread (ISO 228/1) Weight 728 g Operating conditions Medium Air, Argon, O₂, N₂, CO₂* Medium quality ISO 8573-1: 4.6.3 or better Medium temperature -30 ... +70 °C Medium humidity ≤ 20 °C Td Operating pressure (model depending) -0.1 ... 1.6 MPa (S230) -0.1 ... 35 MPa (S231) Ambient temperature -20 ... +50 °C Ambient humidity 0 ... 100 % rH Storage temperature -20 ... +50 °C Transport temperature -30 ... +70 °C Signal / Interface & Supply Analog output Signal 4 ... 20 mA (isolated) Modbus/RTU Scaling S230: 4 mA = -100 °C Td; 20 mA = +20 °C Td S231: 4 mA = -50 °C Td; 20 mA = +20 °C Td Load 250R Update rate 3/sec Fieldbus Protocol Modbus/RTU Update rate 1/sec Supply Voltage supply 10 ... 30 VDC Current consumption 45 mA @ 24 VDC 3/4
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