User manual VAISALA HMM213

[. . . ] USER'S GUIDE Vaisala HUMICAP Humidity and Temperature Module HMM213 ® U339EN-1. 3 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. The contents are subject to change without prior notice. Please observe that this manual does not create any legally binding obligations for Vaisala towards the customer or end user. [. . . ] A difference of a few degrees in temperature may cause water to condense on the sensor surface. Efficient ventilation accelerates the evaporation of the condensed water whereas in an unventilated space, it may take hours. The HUMICAP®180R sensor returns to its normal functioning as soon as water has evaporated. Contaminated water condensing on the sensor may shorten its life span and alter the calibration. VAISALA _______________________________________________________________________ 17 USER'S GUIDE____________________________________________________________________ 10 9 8 7 dRH (%RH) 6 5 4 3 2 1 0 -40 -20 0 20 40 60 80 100 Temperature (°C) Figure 1 Measurement Error at 100 %RH when the Temperature Difference between the Ambient Air and the Sensor is 1 °C NOTE With a dewpoint module, the temperature equilibrium is not a problem as the temperature of the sensor head changes continuously and the sensor head has a fast humidity response. 18 ____________________________________________________________________ U339EN-1. 3 Chapter 4 _______________________________________________________________ Installation CHAPTER 4 INSTALLATION This chapter provides you with information that is intended to help you install this product. Selecting Location Finding a suitable site for HMM213 is important for getting representative ambient measurements Select a place that gives a true picture of the environment or process and is as clean as possible. Air should flow freely around the sensor head. Install the sensor head to a sufficient distance from the duct or chamber walls. Make sure to insert enough cable to the same space with the probe in order to prevent heat conduction. If an additional temperature probe is used, install it so that the warmed sensor head does not interfere with the measurement. Electrical Connections The HMM213 module is connected to a process control system with screw terminals. The wiring diagram is shown in Figure 2 below. X1 TX RX GND TX Us GND Terminal GND RX 12-35VDC + Figure 2 Electrical Connections VAISALA _______________________________________________________________________ 19 USER'S GUIDE____________________________________________________________________ Dimensions 1 (0. 4) 2 1. 0 6( 2) ~6 5 (2 . 56 ) Figure 3 Dimensions in mm (inches) Serial Bus Settings The serial communication parameters set at factory are: Parameter Baud Parity Data bits Stop bits Value 1200 None 8 1 20 ____________________________________________________________________ U339EN-1. 3 Chapter 5 __________________________________________________________ Serial Commands CHAPTER 5 SERIAL COMMANDS This chapter contains information that is needed to use the serial commands for this product. Output via the Serial Bus R Starting the Measurement Output R <cr> Starts output of measurements to the peripheral devices (PC display or printer); output interval is set with command INTV. The output format depends on the transmitter configuration and parameters in use. The order, however, is always the same: relative humidity, temperature, and dewpoint. An example: RH 43. 0 %RH T 21. 0 'C Tdp 8. 0 'C <cr><lf> When the transmitter sends out the readings, the serial interface does not echo any commands; the only command that can be used is S (stop). S Stopping the Measurement Output S<cr> Ends the RUN state; after this command all other commands can be used. VAISALA _______________________________________________________________________ 21 USER'S GUIDE____________________________________________________________________ SEND Outputting a Reading Once SEND <cr> in STOP state or SEND aa <cr> in POLL state aa = address of the transmitter when more than one transmitter is connected to a serial bus (0 . . . 99; set with command ADDR) Outputs the current measurement readings via the serial line. The output format depends on which parameters the transmitter can output. Output types are: "RH 32. 25 %RH T 25. 74 'C ", <cr><lf> "Td 7. 93 'C", <cr><lf> INTV Setting the Output Interval for the RUN State INTV xxx yyy <cr> xxx = yyy = output interval (0 . . . 255) 0: no pause between outputs unit (s, min or h) Sets the output interval when the transmitter outputs measurement readings to a peripheral device. For example: >INTV 10 MIN<cr> Output intrv. : 10 min 22 ____________________________________________________________________ U339EN-1. 3 Chapter 5 __________________________________________________________ Serial Commands SERI Serial Bus Settings SERI b p d s <cr> b= bauds (150, 300, 600, 1200*, 2400, 4800) p= parity (n = none*, e = even, o = odd) d= data bits (7 or 8*) s= stop bits (1* or 2) * factory setting Giving the plain command outputs the current settings: >SERI <cr> Communication parameters > : 1200 N 8 1 Example of changing the serial bus settings: >seri 1200 e 7 1 Communication parameters : 1200 E 7 1 Set terminal settings accordingly > ADDR Setting the Device Address ADDR x x= 0 . . . 99 The command is used to give an address for one device. The address is necessary for communication with a specific transmitter in POLL mode, when there are several modules connected to one serial bus >ADDR 11 Address > : 11 VAISALA _______________________________________________________________________ 23 USER'S GUIDE____________________________________________________________________ UNIT Selecting the Output Units UNIT x <cr> x= Table 5 RH T Td m(etric units) or n(on-metric units) Output Units Metric Units %RH C C Non-Metric Units %RH F F For example, the command for setting the non-metric units is: >UNIT N <cr> Unit > : non metric When the command is given with no parameters, the transmitter outputs the currently valid setting. VERS Displaying Software Version VERS >VERS HMM213 > 1. 03 RESET Resetting the Transmitter RESET <cr> Resets the transmitter. All settings that have been changed stay in the memory even after reset or power failure. 24 ____________________________________________________________________ U339EN-1. 3 Chapter 5 __________________________________________________________ Serial Commands Operating via the Serial Bus SMODE Setting the Serial Interface SMODE xxxx<cr> xxxx = In STOP mode: In RUN mode: In POLL mode: STOP, RUN or POLL measurements output only by command, all commands can be used outputting automatically, only command S can be used measurements output only with command SEND. [. . . ] Handle the sensor by the plastic socket. Recalibrate the transmitter. CAUTION Do not touch the sensor element. Replace a dirty filter to ensure a maximum lifetime and a fast response for the sensor. Replacing Consumables This section describes how to replace consumables. Parts List for Consumables Table 7 Available Spare Parts Order Code HUMICAP180R HM46670 Spare Part HUMICAP®180R Sensor Stainless steel sintered filter VAISALA _______________________________________________________________________ 43 USER'S GUIDE____________________________________________________________________ This page intentionally left blank. 44 ____________________________________________________________________ U339EN-1. 3 Chapter 9 ___________________________________________________________ Troubleshooting CHAPTER 9 TROUBLESHOOTING This chapter describes common problems, their probable causes and remedies, and contact information for technical support. Troubleshooting Procedure When troubleshooting the product, write a problem report consisting of the following issues: - What failed (what worked / did not work)?- Where did it fail (location and environment)?- When did it fail (date, immediately / after a while / periodically / randomly)? [. . . ]