User manual VAISALA DMT346

[. . . ] USER'S GUIDE Vaisala DRYCAP Dewpoint Transmitters DMT345 and DMT346 ® M210762EN-D PUBLISHED BY Vaisala Oyj P. O. Box 26 FI-00421 Helsinki Finland Phone (int. ): +358 9 8949 1 Fax: +358 9 8949 2227 Visit our Internet pages at http://www. vaisala. com/ © Vaisala 2009 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Max/min graph: Shows you the minimum and maximum values in a form of curve. See Table 11 64 __________________________________________________________________ M210762EN-D Chapter 4 ________________________________________________________________ Operation below. The period for the trend and max/min calculations depends on the selected graph window as follows: Table 11 Periods for Trend and Max/Min Calculations Period for Trend/Max/Min Calculations (Resolution) 3 hours 1. 5 minutes 1 day 12 minutes 10 days 2 hours 2 months 12 hours 1 year 3 days 4 year* 12 days * Shows the maximum logging period of the data logger module (available when data logger module is installed) Observation Period Use the following functions in the graphical display: - Press the NEXT button to change between the trend graph and max/min graph for the quantities selected for display. - Press the arrow buttons move the cursor (vertical bar) along the time axis. The numerical value at the cursor position is shown at the left upper corner. The right upper corner shows the time from the present to the chosen moment (without the logger module), or the date and time at the cursor position (when the logger module is installed). - If the optional data logger module is installed, you can scroll the cursor off the screen to move to a new point on the time axis. The new date will be displayed, and the cursor will be centered at the date where the cursor scrolled off the screen. 0706-030 Figure 42 Graphical Display with Data Logger The time that is shown below the graph is adjusted with the current time offset of the transmitter. If you change the transmitter's date and time setting, the displayed timestamps in the history graph change accordingly. For an explanation of the effect of changing the date and time manually, see section Data Logger Module on page 58. VAISALA _______________________________________________________________________ 65 USER'S GUIDE____________________________________________________________________ Table 12 Graph Information Messages Interpretation Power failure (marked also with dashed vertical line) Quantity has not been selected for the display General device failure. Temperature measurement/sensor failure Humidity measurement/sensor failure Adjustment mode active (data recorded in the adjustment mode is not displayed) AutoCal performed (only shown in 3 h graphs) Failure Message Power outage No data Device failure T meas. mode active Autocal A question mark after time tells you that at least one power failure (dashed vertical line) has occurred after the chosen moment. In this case, the actual time difference between the present and the cursor position is not exactly known. Menus and Navigation You can change settings and select functions in the menus. Open the MAIN MENU by pressing any of the arrow buttons in the basic (numeric) display mode. Function button EXIT returns you back to the basic display. Adjustment menu is displayed only when ADJ button (on the motherboard inside the transmitter) is pressed. 66 __________________________________________________________________ M210762EN-D Chapter 4 ________________________________________________________________ Operation 0706-011 Figure 43 Main Views Some menu items, such as Relay outputs in the Interfaces menu, are only shown if supported by the transmitter and the installed options. Changing the Language 1. Go back to the basic display by keeping the right-hand pressed for four seconds. selection by pressing the left-hand Press the right-hand button to exit to the basic display. Rounding Setting Round off one decimal by using the Rounding function . Open the MAIN MENU by pressing any of the arrow buttons. VAISALA _______________________________________________________________________ 67 USER'S GUIDE____________________________________________________________________ 2. Press EXIT to return to the basic display. Display Backlight Setting As a default the display backlight is always on. In the automatic mode the backlight stays on for 30 seconds from the last press of the button. Press EXIT to return to the basic display. Display Contrast Setting 1. Press OK and EXIT to return to the basic display. Keypad Lock (Keyguard) This function locks the keypad and prevents unintentional key presses. [. . . ] 20 mA External loads current outputs Max load + cable loop resistance 0 . . . 10 V Storage temperature range 3-pole screw terminal Max wire size 0 . . . +140 ºF) max 30 mA max 30 mA max 60 mA RL< 500 ohms 540 ohms RL> 2000 ohms RL> 10 000 ohms -55 . . . +176 ºF) 1. 5 mm2 (AWG16) Relay Module Operating temperature range Operating pressure range Power consumption @24 V Contacts SPDT (change over), for example, Contact arrangement Form C Imax Imax Safety standard for the relay component Storage temperature range 3-pole screw terminal / relay Max wire size -40 . . . [. . . ]