User manual VAISALA HMM211

[. . . ] USER'S GUIDE Vaisala HUMICAP Humidity and Temperature Module HMM211 ® M210718EN-B 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] 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. A graph of the measurement error at 100 %RH when the temperature difference between ambient air and the sensor is 1 °C is presented in Figure 1 on page 16. The error is at its greatest when the temperature of the sensor differs from that of the surroundings and the humidity is high. 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 _______________________________________________________________________ 15 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. 16 __________________________________________________________________ M210718EN-B 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 HMM211 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. 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. VAISALA _______________________________________________________________________ 17 USER'S GUIDE____________________________________________________________________ Dimensions 14 (0. ) 2 1 6( . 02 ) ~6 5(2 . 56 ) Figure 2 Dimensions in mm (inches) Electrical Connections Connect wires according to Figure 3 on page 19 (A = voltage output, B = with current module). 18 __________________________________________________________________ M210718EN-B Chapter 4 _______________________________________________________________ Installation 2 1 3 Figure 3 Electrical Connections The following numbers refer to Figure 3 above: 1 = During normal use, leave the jumper as indicated here (factory setting). 2 = Calibration connector for the HM70 or HMI41 3 = Calibration jumper when not in use VAISALA _______________________________________________________________________ 19 USER'S GUIDE____________________________________________________________________ This page intentionally left blank. 20 __________________________________________________________________ M210718EN-B Chapter 5 _______________________________________________________________ Calibration CHAPTER 5 CALIBRATION This chapter provides you with information that is intended to help you calibrate this product. Vaisala recommends a recalibration of the HMM211 module after six months of use. After the first recalibration, the recommended calibration interval is approximately 12 months. However, please note that these intervals depend on the operating conditions and the required accuracy. When calibrating humidity instruments, it is important that the probe, the reference instrument, and the calibrator are in thermal equilibrium. Therefore, always allow enough time for stabilization before starting the actual calibration. - Calibration in the chamber: leave the calibrator (for example, the HMK15) in the chamber overnight with the chamber door open. - Calibration of a humidity and temperature module: allow at least one hour for the stabilization of the calibrator (for example, HM70 handheld humidity and temperature meter with a reference probe). - Calibration of a dewpoint module or of a humidity and temperature module with two sensor heads: allow at least three hours for stabilization if the sensor head is in such an environment that the warming function has been active. The warming function can be deactivated by connecting the jumper to any calibration connector (see Figure 5 on page 25). Note also that when humidity calibrating a Td transmitter, the Td signal on Channel 2 is replaced by the RH signal 0 . . . [. . . ] Automatic chemical purge takes place at startup. Calibration values Chemical purge Output signal Measured values after chemical exposure Humidity Figure 7 Decrease of the Sensor Gain Due to an Interfering Chemical and the Effect of the Chemical Purge Process The sensor with chemical purge option is a composite sensor in which the HUMICAP® and Pt 100 temperature sensors are attached to each other. Chemical purge option requires that the sensor is protected with a stainless steel sintered filter (part no. HM46670). VAISALA _______________________________________________________________________ 29 USER'S GUIDE____________________________________________________________________ This page intentionally left blank. 30 __________________________________________________________________ M210718EN-B Chapter 7 ______________________________________________________________ Maintenance CHAPTER 7 MAINTENANCE This chapter provides information that is needed in basic maintenance of the product. Replacing the HUMICAP180R Sensor and the Filter Remove the damaged sensor and insert a new one. 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 6 Available Spare Parts Order Code HUMICAP180R HM46670 Spare Part HUMICAP®180R Sensor Stainless steel sintered filter VAISALA _______________________________________________________________________ 31 USER'S GUIDE____________________________________________________________________ This page intentionally left blank. 32 __________________________________________________________________ M210718EN-B Chapter 8 ___________________________________________________________ Troubleshooting CHAPTER 8 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)? [. . . ]