User manual VAISALA GMT220

[. . . ] USER'S GUIDE Vaisala CARBOCAP® Carbon Dioxide Transmitter Series GMT220 M010022EN-E 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 2008 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. 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Connect the serial cable to your PC's serial port and transmitter's serial port located in the motherboard, see Figure 9 below. 0807-039 Figure 9 Serial Port and Cable Direction VAISALA _______________________________________________________________________ 17 User's Guide ______________________________________________________________________ Set the serial settings according to Table 3 below. Table 3 Serial Settings Baud rate Parity Data bits Stop bits Flow control 9600 None 8 1 Xon/Xoff (none) NOTE Remember to save the settings after each command. Serial Commands Table 4 Serial Commands Description Sets high relay trigger limit Sets low relay trigger limit Saves changes Sets ambient pressure value Sets ambient temperature value Sets display operation mode Sets current output range Command MF_Rx_HIGH MF_Rx_LOW MAIN_SAVE F MF_PRESSURE MF_TEMP MF_DMODE MF_OUT_I_MODE NOTE To view all set values for the transmitter, use MF command alone, without any parameters. 18 __________________________________________________________________ M010022EN-E Chapter 4 ________________________________________________________________ Operation Setting Relay Trigger Points The relays of the transmitter turn ON/OFF when the CO2 content reaches the predefined trigger point. The two limits are used to prevent the relay switching back and forth when the measured value is very close to set point. Both commands can also be entered without entering a trigger point value. MF_Rx_HIGH yyy<cr> where: x = 1 or 2 (number of the relay) yyy = trigger point (CO2 content in ppm) Example of setting the higher trigger limit of the relay 1: >MF_R1_HIGH 1200 MF_R1_HIGH=1200. 0000 > Save the settings: MAIN_SAVE F<cr> Give the lower trigger limit: MF_Rx_LOW yyy<cr> where: x= 1 or 2 (number of the relay) yyy = trigger point (CO2 content in ppm) Example of setting the lower trigger limit of the relay 1: >MF_R1_Low 900 MF_R1_LOW=900. 000000 > Save the settings: MAIN_SAVE F<cr> VAISALA _______________________________________________________________________ 19 User's Guide ______________________________________________________________________ Pressure Compensation For achieving the most accurate measurements in high altitudes where the barometric pressure is lower than in the sea level, the actual pressure value can be set to the GMT220's software. Pressure values in different altitudes are shown in Table 5 on page 20. The ambient pressure value can be set by using the following command: MF_PRESSURE xxxx<cr> where: xxxx = pressure in hPa Example of setting desired pressure: >MF_PRESSURE 900 MF_PRESSURE=900 > Save the settings: MAIN_SAVE F<cr> Table 5 Altitude m (ft) 0 (sea level) 500 (1640) 1000 (3281) 1500 (4921) 2000 (6562) 2500 (8202) 3000 (9843) Altitude and Atmospheric Pressure Atmospheric Pressure (hPa) 1013 954 899 845 795 757 701 Atmospheric Pressure (psi) 14. 69 13. 84 13. 04 12. 26 11. 53 10. 83 10. 17 Temperature Setting The ambient temperature value can be set by using the following command: MF_TEMP xxx<cr> where: xxx = ambient temperature (°C) x 10. 20 __________________________________________________________________ M010022EN-E Chapter 4 ________________________________________________________________ Operation Example of setting desired temperature (25 °C): >MF_TEMP 250 MF_TEMP=250 > Save the settings: MAIN_SAVE F<cr> Display Setting The display operation mode, display accuracy and probe temperature can be set by using the following command: MF_DMODE x where: x = 0 (zero)/1/2/3/7/8/9 0= no display 1= ppm-reading with one decimal 2= %-reading with two decimals 3=reading with no decimals 7=ppm-reading with no decimal 8= ppm-reading with 10 ppm accuracy >mf_dmode 7 MF_DMODE=07 00 00 00 00 Save the settings: MAIN_SAVE F Setting Current Output Range The current analog output range can be set with the following command: MF_OUT_I_MODE x where: x = 0 (zero)/1 0= 0. . . 20 mA 1= 4. . . 20 mA VAISALA _______________________________________________________________________ 21 User's Guide ______________________________________________________________________ Example: >mf_out_I_mode 0 MF_OUT_I_MODE=0 >mf_out_I_mode 1 MF_OUT_I_MODE=1 Save the settings: MAIN_SAVE F Error States The GM220 series transmitter goes through a continuous selfdiagnostic procedure. A transmitter without a display indicates errors by blinking the three LED lights on the cover. Transmitter with a display indicates error by showing a error code in the display. In all error cases, check first that the probe is connected properly, then reset the transmitter by disconnecting it. In case of a constant error, please contact Vaisala Service Center or a local Vaisala representative (see page 32). NOTE In an error state, the analog output goes to 100 % (20 mA or 10 V). Non-critical and Fatal Errors There are two types of errors. In case of a non-critical instantaneous error, the measurement continues and the error code is displayed. If there is a fatal error, the measurement is interrupted and the corresponding error code is displayed. Non-critical errors are indicated by the blinking of the green operation LED light and fatal errors by the red relay LED lights. 22 __________________________________________________________________ M010022EN-E Chapter 4 ________________________________________________________________ Operation Error Indication in Transmitters without Display Error codes are cabled by blinking a message with short flashes of the LED lights. The green OPERATION LED is blinking when a non-critical error occurs (no effect on relays). The red LEVEL 1 and LEVEL 2 LEDs are blinking when a fatal error occurs (switches the relays OFF). NOTE The red level LED is continously lit when the predefined CO2 concentration is exceeded. Error Messages Table 6 Error Messages Action Contact Vaisala Service Center Contact Vaisala Service Center Contact Vaisala Service Center Contact Vaisala Service Center Contact Vaisala Service Center Contact Vaisala Service Center Contact Vaisala Service Center Contact Vaisala Service Center Contact Vaisala Service Center Contact Vaisala Service Center Contact Vaisala Service Center Error Message Probable Cause Er 01 Main board memory problem Er 02 Er 03 Er 04 Er 05 Er 06 Er 08 Er 10 Er 11 Er 12 Er 13 Main board memory problem Main board memory problem Probe contact failure Probe contact failure Probe contact failure Incompatible probe IR-source failure IR-source failure Sensor failure Signal error VAISALA _______________________________________________________________________ 23 User's Guide ______________________________________________________________________ This page intentionally left blank. 24 __________________________________________________________________ M010022EN-E Chapter 5 ______________________________________________________________ Maintenance CHAPTER 5 MAINTENANCE This chapter provides information that is needed in basic maintenance of the product. Replacing the Probe The probe on the transmitter can be changed and replaced if necessary. Transmitter with Integrated Probe (Wall Model) To replace the integrated probe, do the following: 1. Open the cover Loosen the tightening screw on the transmitter body (see Figure 1 on page 7). Tighten the screw and close the cover. Transmitter with Remote Probe To replace the remote probe, do the following: 1. Loosen the clamping sleeve and pull the probe out, see Figure 2 on page 8. Install a spare probe and tighten the clamping sleeve. VAISALA _______________________________________________________________________ 25 User's Guide ______________________________________________________________________ All the calibration electronics are in the probe. The new probe is automatically identified by the control electronics of the transmitter. NOTE Disconnection of the probe causes an error and switches the relays OFF. Check and Calibration There are three ways to check the transmitter and calibrate it. These are presented in this section. Comparison with Calibrated Probe It is recommended to check the calibration of the GMT220 every second year. [. . . ] Replace the screw onto the adjusting button. BACK-EXIT to return to the basic 17. 19. One-Point Adjustment Procedure CAUTION Please take special care regarding the following when carrying out the adjustment: - Check that you give the correct reference concentrations in the correct units. - Check that the reading has really stabilized before accepting the reading. You cannot revert the factory settings after the adjustment! 1. Insert the probe into the field check adapter (as deep as possible, the perforated filter cover should be completely inside the adapter). [. . . ]