User manual VAISALA HMW60U

[. . . ] All legally binding commitments and agreements are included exclusively in the applicable supply contract or Conditions of Sale. U302en-1. 1 HMW60U/Y Transmitters Operating Manual Contents 1. PRODUCT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 TO BE NOTED WHEN MEASURING HUMIDITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] 7 Temperature (Y model only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6. 3 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6. 4 Electromagnetic compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6. 4. 1 Emissions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6. 4. 2 Immunity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 GUARANTEE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2000-08-23 i HMW60U/Y Transmitters Operating Manual U302en-1. 1 This page intentionally left blank. ii 2000-08-23 U302en-1. 1 HMW60U/Y Transmitters Operating Manual 1. PRODUCT DESCRIPTION The HMW60 transmitters are wall mounted truly two-wire transmitters for the measurement of humidity (HMW60U) and for the measurement of humidity and temperature (HMW60Y). One point calibration is easily performed with the HMI41 indicator and the calibration cable 19116ZZ. Both transmitter types incorporate the HUMICAP®180 humidity sensor which uses an operating principle based on changes in the capacitance of a thin polymer film as it absorbs water molecules. The HMW60Y transmitters mesure temperature with the reliable Pt 1000 sensor. 2000-08-23 1 HMW60U/Y Transmitters Operating Manual U302en-1. 1 2. TO BE NOTED WHEN MEASURING HUMIDITY In the measurement of humidity and especially in calibration, it is essential that the temperature equilibrium is reached. Even a slight difference in the temperature between the measured object and the sensor causes an error. For example, at +20 °C (+ 68 °F) and 50 %RH, a temperature difference of +1 °C between the measured object and the sensor causes an error of +3 %RH. The error is at its greatest when the temperature of the sensor differs from that of the surroundings and the humidity is high. A few degrees' difference in temperature may cause water to condense on sensor surface. Efficient ventilation accelerates evaporation whereas in an unventilated space, it may take hours. The HUMICAP®180 sensor returns to its normal functioning as soon as water has evaporated. [. . . ] The transmitter calibration can be conveniently checked with the HMI41 indicator equipped with an appropriate probe and optional calibration cable. If adjustment is needed, use the one-point calibration potentiometer. 2000-08-23 5 HMW60U/Y Transmitters Operating Manual U302en-1. 1 5. 5. 1 MAINTENANCE Replacing the HUMICAP®180 sensor and the filter Remove the damaged sensor and insert a new one. Recalibrate the transmitter. 6 2000-08-23 U302en-1. 1 HMW60U/Y Transmitters Operating Manual 6. 6. 1 TECHNICAL DATA Relative humidity Measurement range 0. . . 95 %RH (output signal corresponds to 0. . . 100 %RH) Accuracy at +20 °C: %RH 3 2 1 0 -1 -2 -3 0 10 20 30 40 50 60 70 80 90 100 %RH Temperature dependence: %RH 1. 0 0. 5 0 -10 -0. 5 -1. 0 0 10 20 30 40 50 60 °C Response time (90%) at 20 °C in still air Humidity sensor 6. 2 Temperature (Y model only) Measurement range Accuracy : °C 0. 5 0. 4 0. 3 0. 2 0. 1 0 -0. 1 -0. 2 -0. 3 -0. 4 -0. 5 -10 0 10 20 30 40 50 15 s ® HUMICAP 180 -5. . . +55 °C 60 °C Linearity Temperature sensor better than 0. 1 °C Pt 1000 IEC 751 class B 2000-08-23 7 HMW60U/Y Transmitters Operating Manual U302en-1. 1 6. 3 General Supply voltage Output signal Operating temperature range Storage temperature range Long-term humidity range for electronics Housing: cover base plate Connections 6. 4 Electromagnetic compatibility The emission and immunity tests have been performed according to standards EN50081-1 and EN50082-1. [. . . ]