User manual VAISALA HMT360

[. . . ] USER'S GUIDE Vaisala HUMICAP® Dewpoint and Temperature Transmitter Series HMT360 M210744EN-C PUBLISHED BY Vaisala Oyj P. O. Box 26 FIN-00421 Helsinki Finland Phone (int. ): Fax: +358 9 8949 1 +358 9 8949 2227 Visit our Internet pages at http://www. vaisala. com/ © Vaisala 2010 No part of this manual may be reproduced in any form or by any means, electronic or mechanical (including photocopying), nor may its contents be communicated to a third party without prior written permission of the copyright holder. Please observe that this manual does not create any legally binding obligations for Vaisala towards the customer or end user. All legally binding commitments and agreements are included exclusively in the applicable supply contract or Conditions of Sale. ________________________________________________________________________________ Table of Contents CHAPTER 1 GENERAL INFORMATION . [. . . ] The analog output signals can be read from the system or load resistor. WARNING Avoid static discharge. To modify the pressure setting, turn the internal Calibration Enabled/ Disabled DIP switch of the transmitter to position Enabled (up). Adjust the pressure reading with buttons Up and Dn on the display cover; the adjustment step is 0. 5 bara). To complete the pressure setting, turn the DIP switch back to position disabled (down). If the pressure setting is not modified, the measurement readings appear automatically on the display after 60 seconds. 46 __________________________________________________________________ M210744EN-C Chapter 4 ________________________________________________________________ Operation DIP Switch Functions The table below is also printed on the protection board: 0505-285 Figure 22 DIP Switch Functions 1: Analog output test on/off If you turn the switch to on position (up), you can force the outputs to states 4 mA, 12 mA and 20 mA by pressing buttons Up and Dn on the cover. If this switch is in the disabled position (down), it does not allow any calibrations or scalings. NOTE Keep this switch always in the disabled position during normal use of the transmitter. 3 and 4: Calibration rh, t, analog With these combinations you can perform relative humidity, temperature or analog output calibrations with a multimeter or with the transmitter display unit. Turn the DIP switches to the desired position according to the table printed on the protective cover. VAISALA _______________________________________________________________________ 47 User's Guide ______________________________________________________________________ 5: Output quantities Determines whether the output units are metric (down) on non-metric. 6, 7 and 8: Select output quantities With the three DIP switches on the right, you can select the output quantities according to the table printed on the right side of the protective cover. The special option gives you the choice of setting any ordered quantity to each channel. NOTE Always restore the DIP switch settings after having tested the analog outputs or performing the calibration. Display/Keypad Commands NOTE Chapter 6, Calibration and Adjustment, on page 63 describes separately display/keypad commands for calibration and adjustment. Setting the Pressure for Calculations In dewpoint transmitters, the process pressure in the measurement point is required to achieve the specified accuracy. To modify the pressure settings, turn the internal Calibration Enabled/ Disabled DIP switch of the transmitter to position Enabled (up). Press button C on the display cover: text "SCAL" appears on the display. Then press button E until the following display appears (the numeric value is always the existing setting, in this example 1. 0): Adjust the pressure reading with buttons Up and Dn. To complete the pressure setting, turn the dip switch back to position disabled (down). 0505-087 48 __________________________________________________________________ M210744EN-C Chapter 4 ________________________________________________________________ Operation See the pressure conversion table below: Table 5 FROM Pressure Conversion Chart hPa (mbar) psi bar MPa TO hPa (mbar) psi bar MPa 1 0. 0145 0. 001 0. 0001 68. 95 1 0. 06895 0. 006895 1000 14. 5 1 0. 1 10000 145 10 1 Example: 200 psi = 200 × 68. 95 = 13790 hPa (mbar) Selecting Output Quantities Two quantities are shown on the LCD. The upper half of the display shows the moisture, whereas the lower half is reserved for the temperature reading. Upper Half of Display To select between metric/non metric output quantities, use the output quantities metric/nonmetric. DIP switch is in the metric (down) position, the available quantities are dewpoint temperature (Td °C), volume concentration (ppm), and water content in mg/m3 (w). When the DIP switch is in the non metric (up) position, the available quantities are dew/frost point temperature (Td °F), volume concentration (ppmv), and water content in lb/mmscf (w). To modify the displayed quantity, turn the Calibration Enabled/ Disabled DIP switch of the transmitter to position Enabled (up). Select the required quantity with button Up on the display cover, and acknowledge the value with button E. To complete the selections, turn the DIP switch back to position disabled (down). Character Quantity Abbreviation Metric Unit Nonmetric Unit 1 2 6 temperature dewpoint temperature volume concentration T Td ppmv °C °C ppmv °F °F ppmv VAISALA _______________________________________________________________________ 49 User's Guide ______________________________________________________________________ Character Quantity Abbreviation Metric Unit Nonmetric Unit A water content w mg/m3 lb/MMscf Lower Half of Display The output quantities metric/non metric DIP switch can be used to select between °C and °F. It is possible to check the pressure setting of the transmitter by pressing button Dn. [. . . ] A corroded or otherwise damaged sensor has to be replaced, which needs to be done by your nearest Vaisala Service Center. See section Technical Support on page 74 for contact information. 0605-052 Figure 25 Sensor Element is Located under the Filter The sensor element is located under the sintered steel filter. A dirty sensor element can be cleaned by soaking the sensor in de-ionized water or IPA (isopropanol, propan-2-ol), as follows: 1. Rinse the sensor with de-ionized water or IPA for no more than one minute. [. . . ]