Vaisala GMT220 Series User Manual
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Summary of Contents for Vaisala GMT220 Series
- Page 1 GMT220 Series transmitter ’ UIDE U376EN-1.1 September 1999...
- Page 2 FINLAND Visit our Internet pages at http://www.vaisala.com/ © Vaisala 1999 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.
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Page 3: Table Of Contents
1_______________________________________________________ G HAPTER ENERAL NFORMATION Table of contents CHAPTER 1 GENERAL INFORMATION ................2 Safety ..................2 Warranty ..................2 CHAPTER 2 PRODUCT DESCRIPTION................3 Parts ...................3 Led light indicators and optional display.......5 CHAPTER 3 INSTALLATION AND MAINTENANCE ............6 Mounting..................6 Electrical connections..............7 Power supply requirements ............8 Connection to a 24 VAC supply ..........8 Relays ..................9 Maintenance ................10... -
Page 4: Chapter 1 General Information
Note highlights important information. It calls attention to an essential procedure, practice, condition or the like. Warranty Vaisala issues a guarantee for the material and workmanship of this product under normal operating conditions for one (1) year from the date of delivery. Exceptional operating conditions, damage due to careless handling and misapplication will void the guarantee. -
Page 5: Chapter 2 Product Description
2_______________________________________________________ P HAPTER RODUCT DESCRIPTION CHAPTER 2 PRODUCT DESCRIPTION Vaisala’s GMT220 transmitters are versatile instruments for ® measuring CO in industrial applications. The CARBOCAP sensor is silicon based and its operation is based on the NDIR Single-Beam Dual-Wavelength principle. Parts Different parts of the GMT220 transmitter are shown in Figure 1 and Figure 2. - Page 6 ’ _______________________________________________________________________ UIDE Figure 2 Different parts of GMT220. Probe installed remotely. 4 ______________________________________________________________________ U376EN-1.1...
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Page 7: Led Light Indicators And Optional Display
2_______________________________________________________ P HAPTER RODUCT DESCRIPTION Led light indicators and optional display The GMT220 series transmitter has as standard three light indicators on the cover plate: operation, level 1 and level 2 (see Figure 3). The green operation is lit as the power is connected. If the... -
Page 8: Installation And Maintenance
’ _______________________________________________________________________ UIDE CHAPTER 3 INSTALLATION AND MAINTENANCE Mounting Mount the wall model transmitter or the remote probe into a place, which gives a true picture of the environment to be measured and is as clean as possible. Air should circulate freely around the probe. Please take into a consideration that because CO is slightly heavier than air it tends to accumulate in low areas without proper ventilation e.g. -
Page 9: Electrical Connections
3________________________________________________ I HAPTER NSTALLATION AND MAINTENANCE Figure 5 Mounting the probe in a duct or channel. When the probe is installed in a duct or channel, it is recommended to use the optional mounting flange GM45156. All you need to do is to drill a hole with minimum diameter of 22 mm in the wall. -
Page 10: Power Supply Requirements
DC supply. Connection to a 24 VAC supply The GMT220 series transmitters can also be connected to a 24 VAC supply without an external rectifier. However, when more than one transmitter is connected to one 24 VAC transformer, a common loop is formed and there is an increased risk of a short-circuit. -
Page 11: Relays
3________________________________________________ I HAPTER NSTALLATION AND MAINTENANCE Figure 7 AC connections Relays If the relay outputs are used, the wiring is done at the left-hand side terminals on the motherboard (see Figure 6). When the relay trigger point is exceeded, the relay switches on (default). This function can be inversed by disconnecting the corresponding relay jumper (L1 or L2). -
Page 12: Maintenance
This is assumable especially in case of the integrated probe. 4. Compare the readings measured with the original and the reference probe. If there is need for re-calibration / adjustment of the probe, please contact Vaisala or Vaisala’s representative. 10 _____________________________________________________________________ U376EN-1.1... -
Page 13: Self Diagnostics
ON. If any error occurs, please check first that the probe is connected properly. In case of a constant error, please contact either Vaisala or your local Vaisala representative. NOTE Disconnection of the probe causes an error and relay activation. -
Page 14: Serial Communication Settings
’ _______________________________________________________________________ UIDE CHAPTER 4 SERIAL COMMUNICATION SETTINGS Table 1 Serial interface settings Baud rate 9600 Parity none Data bits Stop bits Setting relay trigger points The relays of the transmitter turn when the CO content reaches the predefined trigger point. These points can be changed by using the adapter (19040GM), a computer and a suitable terminal software. -
Page 15: Pressure Compensation
NOTE Remember to save the settings. Pressure compensation GMT220 series transmitters have pressure compensation in the software calculations. The factory set value for current pressure is 1013 hPa. For example in case of high altitude, the pressure value can be changed by using the adapter (19040GM), a computer and a suitable terminal software. -
Page 16: Chapter 5 Technical Data
’ _______________________________________________________________________ UIDE CHAPTER 5 TECHNICAL DATA Dimensions in mm (inches) 14 _____________________________________________________________________ U376EN-1.1... -
Page 17: Technical Specifications
5____________________________________________________________ T HAPTER ECHNICAL DATA _________________________________________________________________________ 15 AISALA... -
Page 18: Operating Conditions
’ _______________________________________________________________________ UIDE Technical specifications Measuring range GMT221 0...2% CO , 0...3% CO 0...5% CO , 0...10% CO 0...20% CO GMT222 0...2000 ppm, 0...3000 ppm, 0...5000 ppm, 0...7000 ppm, 0...10 000 ppm Accuracy at 25°C against certified factory references GMT221 <... -
Page 19: Mechanics
5____________________________________________________________ T HAPTER ECHNICAL DATA Mechanics Housing material transmitter body ABS plastic probe PC plastic Housing classification IP65/NEMA4 Weight GMT221: max. 280 g GMT222 max. 300 g Electromagnetic compatibility The GMT221 and GMT222 transmitters comply with the following EMC standards and have passed the following tests: EN 50081-1 (EN 55022 Class B = CISPR 22) EN 50082-1...