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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] 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). The HMW60U/Y transmitters can be mounted directly on the wall. 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. If relative humidity is 90 %RH, the error is about +5. 4 %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. Any contaminated water condensing on the sensor may shorten its life span and change the calibration. 10 9 8 7 dRH (%RH) 6 5 4 3 2 1 0 -40 -20 0 20 40 60 80 100 Temperature (°C) Figure 2. 1 Measurement error at 100 %RH when the temperature difference between the ambient and the sensor is 1 °C 2 2000-08-23 U302en-1. 1 HMW60U/Y Transmitters Operating Manual 3. 3. 1 INSTALLATION Selecting the place of installation Select a place that gives a true picture of the environment or process and is as clean as possible. Air should circulate freely around the sensor. [. . . ] 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. Handle the sensor by the plastic socket. 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. 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