vaisala GMP343 User Guide

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USER'S GUIDE

Vaisala CARBOCAP®

Carbon Dioxide Probe

GMP343

M210514EN-C

PUBLISHED BY

Vaisala Oyj Phone (int.): +358 9 8949 1 P.O. Box 26 Fax: +358 9 8949 2227 FIN-00421 Helsinki Finland

Visit our Internet pages at http://www.vaisala.com/ © Vaisala 2007 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.

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CHAPTER 1

GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Version Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

General Safety Considerations . . . . . . . . . . . . . . . . . . . . .10

Feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

ESD Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

CHAPTER 2

PRODUCT OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Introduction to GMP343 . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

GMP343 Transmitter Components . . . . . . . . . . . . . . . . . . .14

User Configurable CO2 Measurement . . . . . . . . . . . . . . . .15

Principle of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Optics Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Gas Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Diffusion Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Flow-Through Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Sampling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Soil Adapter Kits for In-Soil Applications . . . . . . . . . . . . . .19

MI70 Indicator Connection . . . . . . . . . . . . . . . . . . . . . . . . .19

Recharging the Battery Pack. . . . . . . . . . . . . . . . . . . . 19

Structure of the MI70 Indicator . . . . . . . . . . . . . . . . . . 20

Using MI70 as a Display . . . . . . . . . . . . . . . . . . . . . . . 21

Introduction of Function Keys and Menu Structure. 21

Initialization of MI70 . . . . . . . . . . . . . . . . . . . . . . . . 21

Navigation in Menu. . . . . . . . . . . . . . . . . . . . . . . . . 22

Using MI70 in Recording . . . . . . . . . . . . . . . . . . . . . . . 23

Transferring Recorded Data to PC . . . . . . . . . . . . . . . 23

CHAPTER 3

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Wiring of the Junction Box . . . . . . . . . . . . . . . . . . . . . . . . .27

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CHAPTER 4

OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Connecting GMP343 to PC . . . . . . . . . . . . . . . . . . . . . . . . . .29

Connection Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Installing the Driver for the USB Cable . . . . . . . . . . . . 29

Opening a Terminal Connection . . . . . . . . . . . . . . . . . . . .30

Operation modes of the GMP343 . . . . . . . . . . . . . . . . . . . . .32

Getting the Measurement Message . . . . . . . . . . . . . . . . . . .33

Measurement Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

Starting the Continuous Outputting . . . . . . . . . . . . . . . . . .33

Stopping the Continuous Outputting . . . . . . . . . . . . . . . . .33

Setting the Continuous Outputting Interval . . . . . . . . . . . .34

Outputting the Reading Once . . . . . . . . . . . . . . . . . . . . . . .34

Setting the Serial Interface Measurement Mode . . . . . . . .35

Setting Communication Hardware . . . . . . . . . . . . . . . . . . .35

Serial Communication Settings . . . . . . . . . . . . . . . . . . . . .36

Formatting the Measurement Message . . . . . . . . . . . . . . . .36

Formatting the Message . . . . . . . . . . . . . . . . . . . . . . . . . .36

Setting Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

Networking Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

Setting the Transmitter Address . . . . . . . . . . . . . . . . . . . . .39

Open and Close . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

Setting Echoing Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

Preparation for Network Operation . . . . . . . . . . . . . . . . . .40

Commands during Network Operation . . . . . . . . . . . . . . . .41

Measurement Range, Data Filtering and Linearization . . .41

Setting the Measurement Range . . . . . . . . . . . . . . . . . . . .41

Measurement Data Filtering . . . . . . . . . . . . . . . . . . . . . . . .42

Median Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Averaging Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Smoothing Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

How the Filtering Affects the Response Time . . . . . . . 44

Setting the Median Filter . . . . . . . . . . . . . . . . . . . . . . . . . .45

Setting the Averaging Filter . . . . . . . . . . . . . . . . . . . . . . . .45

Setting the Smoothing Filter . . . . . . . . . . . . . . . . . . . . . . . .45

Flushing the Filters (Resynchronization) . . . . . . . . . . . . . .46

Linearization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

Setting the Linearization ON/OFF . . . . . . . . . . . . . . . . . . .46

Temperature, Pressure, Relative Humidity, and Oxygen

Compensations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

Temperature Compensation ON/O FF . . . . . . . . . . . . . . . .48

Setting the Oxygen Concentration . . . . . . . . . . . . . . . . . . .49

Setting Oxygen When the Device Is in POLL-mode . . 49

Oxygen Compensation Mode . . . . . . . . . . . . . . . . . . . . . . .49

Setting the Ambient Pressure (hPa) . . . . . . . . . . . . . . . . . .50

Setting Pressure When the Device Is in POLL-mode . 50

Pressure Compensation ON/OFF . . . . . . . . . . . . . . . . . . .51

Setting Ambient Relative Humidity . . . . . . . . . . . . . . . . . . .51

Setting Humidity When the Device Is in POLL-mode. . 51

Relative Humidity Compensation ON/OFF . . . . . . . . . . . .52

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Setting and Testing the Analog Outputs . . . . . . . . . . . . . .52

Analog Output Hardware . . . . . . . . . . . . . . . . . . . . . . . . . .53

Setting the Limit of the Current Output Range . . . . . . . . . .53

Setting the High Limit of the Voltage Output Range . . . . .54

Setting the High Limit of the Concentration Range . . . . . .54

Setting the Low Limit of the Concentration Range . . . . . . .55

Setting the Analog Output Overrange Clip . . . . . . . . . . . . .55

Testing the Analog Output . . . . . . . . . . . . . . . . . . . . . . . . .56

Setting the Analog Output Error Level . . . . . . . . . . . . . . . .56

Device Information and Other General Commands . . . . . .57

Device Information List . . . . . . . . . . . . . . . . . . . . . . . . . . .57

Show the Output Quantities . . . . . . . . . . . . . . . . . . . . . . . .57

Linear and Multipoint Corrections . . . . . . . . . . . . . . . . . . .58

Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

Command List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

Showing the Parameters . . . . . . . . . . . . . . . . . . . . . . . . . .59

Software Version Information . . . . . . . . . . . . . . . . . . . . . . .60

Memory Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60

Reverting the Factory Parameters . . . . . . . . . . . . . . . . . . .60

Saving the Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60

Setting the Optics Heating ON/OFF . . . . . . . . . . . . . . . . . . .61

Resetting the Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . .61

CHAPTER 5

CALIBRATION AND ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63

Calibration Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63

Factory Calibration and Adjustment . . . . . . . . . . . . . . . . . .64

Calibration and Adjustment by the User . . . . . . . . . . . . . . .64

Calibration (Checking) . . . . . . . . . . . . . . . . . . . . . . . . . . . .64

Checking the Compensations . . . . . . . . . . . . . . . . . . . 64

Measurements in Reference Gases . . . . . . . . . . . . . . 65

Adjustment in 1...2 Points . . . . . . . . . . . . . . . . . . . . . . . . .66

Adjustment in 3...8 Points . . . . . . . . . . . . . . . . . . . . . . . . .67

Example of the 2-Point Adjustment Procedure . . . . . . 67

CHAPTER 6

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71

Cleaning the Optics (Diffusion Model Only) . . . . . . . . . . . .71

Changing the Filter (Diffusion Model Only) . . . . . . . . . . . .73

Error States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74

Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75

Return Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75

Vaisala Service Centers . . . . . . . . . . . . . . . . . . . . . . . . . . . .76

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CHAPTER 7

TECHNICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77

Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77

Effects of Temperature, Pressure, Relative Humidity,

and Oxygen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78

Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78

Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79

Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79

Oxygen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79

Response time (90 %) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80

Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80

Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81

Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82

Spare Parts and Accessories . . . . . . . . . . . . . . . . . . . . . . . .82

APPENDIX A

DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83

GMP343 (Flow-through) . . . . . . . . . . . . . . . . . . . . . . . . . . . .84

GMP343 (Diffusion) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85

Calibration Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86

Mounting Flange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87

Junction Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88

Mounting Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89

APPENDIX B

LIST OF COMMANDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91

Measurement Commands . . . . . . . . . . . . . . . . . . . . . . . . . . .91

Filtering Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .92

P, T and RH Compensation Commands . . . . . . . . . . . . . . .92

Device Handling Commands . . . . . . . . . . . . . . . . . . . . . . . .92

Device Information Display Commands . . . . . . . . . . . . . . .92

Calibration Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93

Setting and Testing the Analog Outputs . . . . . . . . . . . . . . .93

Advanced Measurement Commands . . . . . . . . . . . . . . . . .93

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List of Figures

Figure 1 Two Models of GMP343. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Figure 2 Principle of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Figure 3 Components of the Sampling System . . . . . . . . . . . . . . . . . . .18

Figure 4 Examples of Optional Accessories. . . . . . . . . . . . . . . . . . . . . .18

Figure 5 Structure of the MI70 Indicator. . . . . . . . . . . . . . . . . . . . . . . . .20

Figure 6 Keyboard of MI70 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

Figure 7 Mounting GMP343. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Figure 8 Entering Measurement Values. . . . . . . . . . . . . . . . . . . . . . . . .42

Figure 9 The Difference of the Two Filters in Time Response. . . . . . . .44

Figure 10 Optics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71

Figure 11 GMP343 Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . .81

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List of Tables

Table 1 Manual Revisions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Table 2 Wiring Pins. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Table 3 Communication Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

Table 4 Quantities. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

Table 5 Modifiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

Table 6 Averaging Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

Table 7 Troubleshooting Errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74

Table 8 Effect of Temperature on Accuracy with Temperature

Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78

Table 9 Effect of Pressure on Accuracy with Pressure Compensation. . .79

Table 10 Diffusion Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80

Table 11 Flow-through Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80

Table 12 List of Spare Parts and Accessories . . . . . . . . . . . . . . . . . . . . . .82

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Chapter 1 ________________________________________________________ General Information

CHAPTER 1

GENERAL INFORMATION

This chapter provides general notes for the manual and the product.

About This Manual

This manual provides information for installing, operating, and

maintaining the Vaisala CARBOCAP® Carbon Dioxide Probe

GMP343.

Version Information

Table 1 Manual Revisions

Manual Code Description

M210514EN-A October 2003 - First version. M210514EN-B April 2005 M210514EN-C August 2007 - New probe housing

and software.

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General Safety Considerations

Throughout the manual, important safety considerations are highlighted as follows:

WARNING

CAUTION

NOTE

Warning alerts you to a serious hazard. If you do not read and follow instructions very carefully at this point, there is a risk of injury or even death.

Caution warns you of a potential hazard. If you do not read and follow instructions carefully at this point, the product could be damaged or important data could be lost.

Note highlights important information on using the product.

Feedback

Vaisala Customer Documentation Team welcomes your comments and suggestions on the quality and usefulness of this publication. If you find errors or have other suggestions for improvement, please indicate the chapter, section, and page number. You can send comments to us by email: manuals@vaisala.com.

ESD Protection

Electrostatic Discharge (ESD) can cause immediate or latent damage to electronic circuits. Vaisala products are adequately protected against ESD for their intended use. However, it is possible to damage the product by delivering electrostatic discharges when touching, removing, or inserting any objects inside the equipment housing.To make sure you are not delivering high static voltages yourself handle ESD sensitive components on a properly grounded and protected ESD workbench. When this is not possible, ground yourself to the equipment chassis before touching the connections. Ground yourself with a wrist strap and a resistive connection cord. When neither of the above is possible, touch a conductive part of the equipment chassis with your other hand before touching the boards.

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Chapter 1 ________________________________________________________ General Information

Warranty

Vaisala hereby represents and warrants all Products manufactured by Vaisala and sold hereunder to be free from defects in workmanship or material during a period of twelve (12) months from the date of delivery save for products for which a special warranty is given. If any Product proves however to be defective in workmanship or material within the period herein provided Vaisala undertakes to the exclusion of any other remedy to repair or at its own option replace the defective Product or part thereof free of charge and otherwise on the same conditions as for the original Product or part without extension to original warranty time. Defective parts replaced in accordance with this clause shall be placed at the disposal of Vaisala.

Vaisala also warrants the quality of all repair and service works performed by its employees to products sold by it. In case the repair or service works should appear inadequate or faulty and should this cause malfunction or nonfunction of the product to which the service was performed Vaisala shall at its free option either repair or have repaired or replace the product in question. The working hours used by employees of Vaisala for such repair or replacement shall be free of charge to the client. This service warranty shall be valid for a period of six (6) months from the date the service measures were completed.

This warranty does not however apply when the defect has been caused through

a) normal wear and tear or accident;

b) misuse or other unsuitable or unauthorized use of the Product or negligence or error in storing, maintaining or in handling the Product or any equipment thereof;

c) wrong installation or assembly or failure to se rv ice the Product or otherwise follow Vaisala's service instructions including any repairs or installation or assembly or service made by unauthorized personnel not approved by Vaisala or replacements with parts not manufactured or supplied by Vaisala;

d) modifications or changes of the Product as well as any adding to it without Vaisala's prior authorization;

e) other factors depending on the Customer or a third party.

Notwithstanding the aforesaid Vaisala's liability under this clause shall not apply to any defects arising out of materials, designs or instructions provided by the Customer.

This warranty is however subject to following conditions:

a) A substantiated written claim as to any alleged defects shall have been received by Vaisala within thirty (30) days after the defect or fault became known or occurred, and

b) The allegedly defective Product or part shall, should Vaisala so require, be sent to the works of Vaisala or to such other place as Vaisala may indicate in writing, freight and insurance prepaid and properly packed and labelled, unless Vaisala agrees to inspect and repair the Product or replace it on site.

This warranty is expressly in lieu of and excludes all other conditions, warranties and liabilities, express or implied, whether under law, statute or otherwise, including without limitation any implied warranties of merchantability or fitness for a particular purpose and all other obligations and liabilities of Vaisala or its representatives with respect to any defect or deficiency applicable to or resulting directly or indirectly from the Products supplied hereunder, which obligations and liabilities are hereby expressly cancelled and waived. Vaisala's liability shall under no circumstances exceed the invoice price of any Product for which a warranty claim is made, nor shall Vaisala in any circumstances be liable for lost profits or other consequential loss whether direct or indirect or for special damages.

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Chapter 2 __________________________________________________________ Product Overview

CHAPTER 2

PRODUCT OVERVIEW

This chapter introduces the features of the GMP343.

Introduction to GMP343

Vaisala CARBOCAP® Carbon Dioxide Probe GMP343 is designed for

high accuracy CO2 measurements. The measurement is based on the

advanced CARBOCAP® Single-Beam Dual-Wavelength NDIR

technology. GMP343 consists of a CO2 sensor, electronics, and a

housing suitable for long-term outdoor use.There are two GMP343

models available: a flow-through model and a diffusion model. One

adjustable analog output can be configured to output voltage or current

signal (0 ... 2.5 V, 0 ... 5 V, 4 ... 20 mA). A digital output for RS232/

RS485 communication is available. The measuring range options vary

from 0 ... 1000 ppm to 0 ... 2 %CO2.

The GMP343 can be ordered with various adapter, filter, and

connection cable options. For a list of spare parts and accessories, see

section Spare Parts and Accessories on page 82.

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GMP343 Transmitter Components

NOTE

Figure 1 Two Models of GMP343

The following numbers refer to Figure 1 above. 1=Filter 2 = Wiring connector 3=Gas in 4 = Gas out 5 = Back flange (do not open)

Warranty is void if the back flange of the GMP343 has been opened by the user.

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Chapter 2 __________________________________________________________ Product Overview

User Configurable CO2 Measurement

The measurement output of the GMP343 is user configurable. You may

have the raw data without filtering or compensation, or you may set the

filtering levels, enable compensation (pressure, temperature, relative

humidity, and oxygen) and linearization.

You can also select the measurement range to optimize the performance

of the GMP343 for a certain concentration level. Selecting an

appropriate measurement range increases accuracy, since it enables the

range-specific compensation and linearization settings. For more

information, see sections Setting the Measurement Range on page 41

and Temperature, Pressure, Relative Humidity, and Oxygen

Compensations on page 47.

Principle of Operation

The infra-red sensor of GMP343 is based on the proprietary Vaisala

CARBOCAP® sensing technology. Here the pulsed light from a

miniature filament lamp is reflected and re-focused back to an IR

detector which is behind a silicon-based Fabry-Perot Interferometer

(FPI). This tiny FPI is tuned electrically so that its measurement

wavelength is changed between the absorption band of the CO2 gas and

a reference band.

Figure 2 Principle of Operation

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User's Guide ______________________________________________________________________

When the passband of the FPI coincides with the absorption wavelength of the CO2 gas, the IR detector sees a decrease in the light transmission.

The measurement wavelength of the FPI is then changed to the reference band (that has no absorption lines) and the IR detector sees a full light transmission. The ratio of these two signals indicates the degree of light absorption in the gas and is proportional to the gas concentration. It takes 2 seconds to measure this sequence and to calculate one reading.

Use of numerical filtering reduces the noise of the raw data. On the other hand, the filtering increases the response time of the device (see

Figure 9 on page 44).

Optics Heating

Two heating elements are placed in the optics; one behind the mirror and one behind the window of the sensor. Heating should always be turned on when there is a risk of dew formation on the optics surface. The heating maintains the surface temperature of the optics a few degrees above the ambient temperature.

The heating is disabled by default. For instructions on how to control the optics heating, refer to section Setting the Optics Heating ON/OFF

on page 61.

NOTE

The optics heating is automatically disabled when you connect the GMP343 to a MI70 indicator.

Gas Sampling

There are two GMP343 models available: a flow-through model and a diffusion model.

Diffusion Sampling

No sampling system is needed with the GMP343 diffusion model. The diffusion filter and the plastic filter cover protect the measuring chamber from dirt, water, and contaminants.

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In order to have a quick measurement with very short response time the

filter can be removed; see section Response time (90 %) on page 80. In

this case the optics are openly exposed to contamination and cleaning

of optics may be necessary more often. For instructions on cleaning the

optics, refer to section Cleaning the Optics (Diffusion Model Only) on

page 71. Removal of the filter is not recommended if there is a risk of

getting water or dirt particles on the optics.

Flow-Through Sampling

The maximum gas flow rate is 10 liters/min. When using high flow

rates, please note how the flow rate affects the accuracy, see

Specifications, Oxygen, on page 79 (flow dependence). The volume of

the internal measurement chamber is 59 ml ± 1 ml.

The gas sample must not include acidic gases.

CAUTION

Liquids or acidic vapors may seriously damage the sensor.

Sampling System

The GMP343 flow-through model has no diffusion filter inside the

measuring chamber and the optics of the flow-through model cannot be

cleaned by the user. Therefore the sample gas must always be filtered

and dried before it is pumped to the measuring chamber. A hydrophobic

diffusion filter before the inlet of the measuring chamber is needed in

order to prevent particles and water from the surroundings from getting

into the sensor. The diffusion filter needs to be exchanged often enough

to provide a sufficient flow.

In humid environments it is important to avoid water condensation

inside the measuring chamber. This can be avoided by drying the

sample air. The most common method of drying the sample air is

cooling and re-heating the air. A simple system may consist for example

of a cooling coil and a water trap which are either cooled or located in

a cool environment, followed by a re-heating system. The idea is to get

the moisture in the sample to condensate on the walls of the copper tube,

trap this water and then lower the relative humidity by heating the

sample. If the temperature inside the measurement chamber is

essentially higher than the surroundings the cooling coil and the water

trap can be simply located outside the chamber. For re-heating, the heat

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generated by a pumping system may sometimes be adequate, meaning that no additional heater is needed. A simplified schema of a sample system removing particles and moisture is illustrated below.

All sampling system components are commercially available.

Figure 3 Components of the Sampling System

Optional Accessories

Various adapter and filter options are available for the GMP343. For a complete list, see section Spare Parts and Accessories on page 82.

Figure 4 Examples of Optional Accessories

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Chapter 2 __________________________________________________________ Product Overview

Soil Adapter Kits for In-Soil

Applications

The vertical/horizontal soil adapter kit consists of a soil adapter and a

hydrophobic sintered PTFE filter. The kits are designed for in-soil CO2

measurements to be used with the diffusion model of GMP343.

MI70 Indicator Connection

Vaisala MI70 indicator is an optional accessory to be used as a display,

communication, and data-logging device for GMP343. When taking

measurements GMP343 is powered via MI70.

Recharging the Battery Pack

MI70 indicator is equipped with a rechargable battery pack when

shipped from factory. The battery pack is located behind the back plate

of the indicator. The recharger is provided with one of the following

AC-adapters: Euro, UK, US or AUS.

1. Recharge the battery pack as follows: Plug in the recharger connector into the connector on top of the indicator and connect the recharger to a wall socket. A battery symbol in the corner of the display starts to roll.

- It is not recommended to use MI70 during the first recharging.

Later on MI70 can be used while recharging.

- Duration of recharging depends on the charge level of the

battery pack being 4 hours typical. The recommended first recharging time is 6 hours.

2. The battery pack is full when the battery symbol in the display stops rolling.

3. Disconnect the recharger.

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Structure of the MI70 Indicator

Figure 5 Structure of the MI70 Indicator

The following numbers refer to Figure 4 above: 1 = Recharging connector 2 = Power On/Off key 3 = Connection cable (DRW216050SP) for GMP343 connection

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Using MI70 as a Display

Introduction of Function Keys and Menu Structure

NOTE

0704-034

Figure 6 Keyboard of MI70

The following numbers refer to Keyboard of MI70 on page 21: 1 = Function keys left/middle/right (can be assigned to shortcuts) 2 = Arrow keys up/down/left/right 3 = Power on/off key

Initialization of MI70

The optics heating is automatically disabled when you connect the GMP343 to the MI70 indicator.

1. Install the connection cable between MI70 and GMP343 (GMP343 is powered from MI70).

2. Turn on MI70 by pressing the Power On/Off key.

3. Select the language by using the up/down arrow keys. Confirm by pressing the SELECT key.

4. To change the date, select Date and press the SET key. Set the date by using the up/down/left/right arrow keys. To confirm the date, press the OK key.

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5. To change the time, select Time and press the SET key. Set the

time by using the up/down/left/right arrow keys. To confirm the time, press the OK key.

6. To check and change the environment settings, select YES. Enter ambient pressure, humidity, and oxygen values. Press the EXIT key.

Navigation in Menu

- To turn the indicator on or off, press the Power On/Off key.

- To open the main menu, press any of the arrow keys and then the middlemost function key in sequence.

- To move in a menu and select an option, press the up/down arrow keys. To enter sub-menu of selected option, press the right arrow key. To return to the previous menu level, press the left arrow key.

- To activate a function: press a function key according to the guiding text below the key.

- To return to the basic display directly from any menu levels, press the function key EXIT.

The main settings are found in the following menu locations:

- To change language, enter: Settings - User interface - Language.

- To select display quantities (carbon dioxide and temperature), enter: Display - Quantities and units. The carbon dioxide concentration is shown in ppm or in %-units and temperature in °C or °F.

- To set the ambient conditions enter Environment menu. Options to choose from: 1013 hPa, 50 % RH, and 20.9 % O2.

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Using MI70 in Recording

Record continuous measurement data and view the recorded data by using the MI70. This function is found from the menu RECORDING/ VIEWING.

You can switch MI70 off during recording to save battery power. Display message tells you that recording continues undisturbed even when the power is off. If the indicator is switched off during recording, the progress bar is shown on the display every 10 seconds (all the time, if the charger is connected). This bar shows the amount of recorded data.

Save individual measurement data points with Hold/Save function (DISPLAY-HOLD/SAVE DISPLAY) and view the saved data from the RECORDING/VIEWING menu.

CAUTION

Do not disconnect the probe when the data recording is on, even if the indicator is off. This may cause loss of recorded data.

Transferring Recorded Data to PC

The recorded data can be transferred to a PC by using MI70 Link program. MI70 Link program can be ordered from Vaisala, see Table

12, List of Spare Parts and Accessories, on page 82. You can examine

the recorded data easily in Windows and transfer it further to a

spreadsheet program (such as Microsoft More information on the data transfer and software features is found in

the HELP-file of MI70 Link program.

Excel) for modification.

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Chapter 3 _______________________________________________________________ Installation

CHAPTER 3

INSTALLATION

This chapter provides you with information that is intended to help you install this product.

Mounting

A horizontal mounting position is recommended in order to minimize the problems caused by possible condensation.

0704-020

Figure 7 Mounting GMP343

1. Fasten the GMP343 to the mounting bracket by using the screw provided.

2. Mount the mounting bracket with 4 screws (on corners of the plate).

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Wiring

As it is shipped from the factory, the measurement range and output of the GMP343 are scaled according to the order form completed by the customer. The unit is calibrated at the factory. The device is ready for use when the wiring is done and power is switched on.

GMP343 can be connected to a PC using an optional PC connection cable, see Table 12, List of Spare Parts and Accessories, on page 82.

For more information on serial commands, see Chapter 4, Operation, on

page 29.

WARNING

Make sure that the main power is switched off before making any electrical connections.

Table 2 Wiring Pins

Pin Wire Serial signal (RS232 or 2-

Wire RS485 interface)

1 White RS232C: TX RS485: A(+) 2 Brown RS232C: TX RS485: A(+) 3 Green RS232C: RX RS485: B(-) 4 Yellow - - Signal + 5 Grey Supply GND Supply GND Supply GND 6 Pink +11...36 V DC +11...36 V DC +11...3 6 V DC 7 Blue RS232C: RX RS485: B(-) 8 Shield - - Signal GND

Analog signal

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There are two pins per signal internally hardwired in parallel (pins 1 and 2, pins 3 and 7). You should connect the RS232C signal 'TX' (or 2-Wire RS485 signal 'A') either to the pin 1 or 2 and the RS232C signal 'RX' (or 2-Wire RS485 signal 'B') either to the pin 3 or 7.

Note that there is either an RS232 or a 2-wire RS485 communication interface available according to initial configuration. However, if the device is configured in RS485 output mode, the device can still be switched into RS232 mode by re-configuration via PC . For more information on serial commands and RS232/485 modes, see Chapter 4,

Operation, on page 29.

Wiring of the Junction Box

The optional 8-pole junction box enables practical in-line connection. The box is provided with 8 numbered terminals.

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CHAPTER 4

OPERATION

This chapter contains information that is needed to operate the GMP343.

Connecting GMP343 to PC

Connection Cables

To connect the GMP343 to a PC, you need the PC Connection Cable (optional accessory 213379). If your PC does not have a serial port, you also need the USB-D9 Serial Connection Cable (optional accessory

219686). By connecting the two cables, you can use a standard type A

USB port to connect the GMP343 to a PC. Both cables are included in the PC Connection Kit that can be ordered

with the GMP343.

Installing the Driver for the USB Cable

Before taking the USB cable into use, you must install the provided USB driver on your PC. When installing the driver, you must acknowledge any security prompts that may appear. The driver is compatible with Windows 2000, Windows XP, Windows Server 2003, and Windows Vista.

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1. Check that the USB cable is not connected. Disconnect the cable if you have already connected it.

2. Insert the media that came with the cable, or download the driver from www.vaisala.com.

3. Execute the USB driver installation program (setup.exe), and accept the installation defaults. The installation of the driver may take several minutes.

4. After the driver has been installed, connect the USB cable to a USB port on your PC. Windows will detect the new device, and use the driver automatically.

5. The installation has reserved a COM port for the cable. Verify the port number, and the status of the cable, using the Vaisala USB Instrument Finder program that has been installed in the Windows Start menu. The reserved ports are also visible in the Ports section of the Windows Device Manager.

Remember to use the correct port in the settings of your terminal program. Windows will recognize each individual cable as a different device, and reserve a new COM port.

There is no reason to uninstall the driver for normal use. However, if you wish to remove the driver files and all Vaisala USB cable devices, you can do so by uninstalling the entry for Vaisala USB Instrument Driver from the Add or Remove Programs (Programs and Features in Windows Vista) in the Windows Control Panel.

Opening a Terminal Connection

The communication interface of GMP343 is RS-232 or RS-485. In case your device is configured to RS-485 communication mode you can still start communication in RS-232 mode (for example when changing the probe setting). See step number 4 in the following instructions.

1. Connect the GMP343 to the PC using the connection cable(s). Refer to section Connection Cables on page 29.

2. Connect the power cables to a 11 ... 36 V power supply.

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3. Open a terminal program and set the communication parameters. When using the terminal session for the first time, save the settings for future use.

Table 3 Communication Parameters

Parameter Value

baud rate 19200 parity no data bits 8 stop bits 1 flow control none

4. Power-up the GMP343. The device should prompt as follows:

GMP343 - Version STD 2.0 Copyright: Vaisala Oyj 2003 - 2006

5. If your device is configured to RS-485 communication mode, switch the device into the service mode by sending a string containing at least 6 capital 'Z' while powering up. The most convenient way using PC is:

Press and keep pressing SHIFT + 'z' while powering up GMP343. Keep pressing SHIFT + 'z' until GMP343 starts up in the service mode. The device should prompt as follows:

COMM PARAMETERS IN EEPROM: SMODE : STOP BAUD RATE: 19200 DATA BITS: 8 PARITY: NONE STOP BITS: 1 ADDR: 0

HARDWARE CONFIGURATION: COMM CHANNEL: RS485 ANALOG OUTPUT: VOLTAGE

GMP343 - VERSION STD 2.0 COPYRIGHT: VAISALA OYJ 2003 -2006 >ZZZZZZZZZZZ

6. Key in the commands with the keyboard of your computer and press enter. In this guide <cr> stands for pressing ENTER .

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NOTE

Responses from the GMP343 are terminated by the following string:

[cr][lf]>

That is a carriage return character, a line feed, and a right angle bracket.

Operation modes of the GMP343

The GMP343 can operate in three different modes:

- RUN mode

- STOP mode

- POLL mode In the RUN mode, the GMP343 sends measurement results at regular

intervals. The included parameters and the interval can be set by the user. While in the RUN mode, the device will not answer any other command except the S command, which stops the RUN mode and switches the device to STOP mode.

The STOP mode is the default mode of operation for the GMP343, where most of the commands listed in this document are available. You can enter the STOP mode from the RUN mode with the S command, or from the POLL mode with the OPEN <addr> command, where <addr> is the unique address of the GMP343. While in the STOP mode, the GMP343 will respond to all unknown commands with the following string:

Unknown command.[cr][lf]>

The POLL mode is dedicated for bus interfacing. To work in the poll mode, each device must have its own unique address. You can enter the POLL mode by giving the CLOSE command in the STOP mode.

Only a single device can be accessed at a time in the POLL mode. In the POLL mode, you can request a single measumement message from the GMP343 using the SEND <addr> command. While in the POLL mode, the GMP343 will ignore all unknown commands.

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Getting the Measurement Message

Measurement Units

GMP343 outputs the following units:

- Carbon dioxide (ppm)

- Temperature (ºC)

For other measurement units (%, non-metric units), use the Vaisala MI70 indicator.

NOTE

Measurement units (ppm and %) express the CO2 concentration by gas volume.1 % CO

= 10 000 ppm CO

Starting the Continuous Outputting

R <cr>

This command starts the continuous outputting of results (output form defined with the command FORM). Data is printed with the interval defined with the command INTV. Printing can be stopped with the command S.

>r 345.0 ppm

344.1 ppm

343.6 ppm

345.6 ppm

346.1 ppm

344.1 ppm

343.5 ppm

345.5 ppm

Stopping the Continuous Outputting

S <cr>

Ends the RUN mode; after this command all other commands can be used.

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Setting the Continuous Outputting Interval

INTV xxxx yyy <cr> SAVE <cr>

xxxx=output interval (1...1000) default=1 s yyy=unit (s, min or h) Example: Output interval is changed to 5 seconds

>intv 5 s INTERVAL : 5 UNIT : S >

Outputting the Reading Once

In STOP mode:

SEND <cr>

In POLL mode:

SEND aa <cr>

aa=address of the transmitter when more than one transmitter is connected to a serial bus (0...99).

The output mode can be changed with the command FORM.

>send

348.7 ppm >

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Setting the Serial Interface Measurement Mode

SMODE xxxx <cr> SAVE <cr>

xxxx= STOP/RUN/POLL In STOP mode: Measurements output only by command, all commands

can be used (default mode). In RUN mode: Outputting automatically, only command S can be used. In POLL mode: Measurements output only with command SEND. For

more details on POLL mode, see section, Networking Operation, on

page 39.

The settings are not valid until the device is reset.

Setting Communication Hardware

Communication hardware can be chosen between RS-232 or RS-485. Command parameters are correspondingly 232 and 485.

RSMODE <cr> SAVE <cr>

The setting is not valid until the device is reset.

>rs mode RSMODE : 232? 485

>save EEPROM saved successfully. >

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Serial Communication Settings

Save the changed settings by entering the SAVE command. The settings are not valid until the device is reset.

SERI <cr> SAVE <cr>

Baud rate: (300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600,

115200) Note: When baud rate is > 19200 the character spacing must be > 1 ms.

If the character spacing is not in use the device may lose some characters.

Data bits: (7/8) Parity: (none, even, odd) Stop bits: (1/2) Key in the settings after the question mark and press ENTER.

>seri BAUD RATE : 19200 ? 19200 DATA BITS : 8 ? 8 PARITY : NONE ? none STOP BITS : 1 ? 1

>save EEPROM saved successfully. >

Formatting the Measurement Message

Formatting the Message

This command is used to change the serial output format of the commands SEND and R.

FORM x <cr> SAVE <cr>

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Chapter 4 ________________________________________________________________ Operation

x= format string Format string consists of quantities and modifiers. You can select one

or more of the following quantities by keying in the abbreviation after

FORM command: Table 4 Quantities

Abbreviations Quantities

CO2 Filtered CO CO2RAW Unfiltered CO CO2RAWUC Unfiltered CO

and corrections (MPC/LC) do not apply. TIME Time passed from last reset ADDR Transmitter address ERR Error flag (0=no error/1=error) in POLL or RUN modes. T Measured temperature P User-set pressure value RH User-set relative humidity value O User-set oxygen value

results. Factory setting.

results.

results. Compensations (P/T/RH/O2)

Table 5 Modifiers

Abbreviations Explations

x.y length modifier (whole numbers and decimal places) #t tabulator #r carriage-return #n line feed "" string constant U5 unit field and length

Example 1:

>form CO2 " " "ppm" #r#n

>save EEPROM saved successfully. >send

336.3 ppm

Example 2:

>form "Filtered data" CO2 "ppm" #r#n >save EEPROM saved successfully >

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>send Filtered data 336.9ppm >

Example 3 (both filtered and raw data chosen):

>form CO2 "ppm" " " CO2RAWUC "ppm" #r#n >send

296.5ppm 270.1ppm

Setting Time

TIME x <cr> SAVE <cr>

x=hh:mm:ss

NOTE

Time passed since the last power on was displayed. Time always resets to 00:00:00 when power is switched off. However, the user can set the time.

Example (time inquiry):

>time 04:00:52 >

Example (time setting):

>time 12:15:00 12:15:00 >time 12:15:02 > >save EEPROM saved successfully. >

Only approximately 1 % accuracy is obtained with the software clock.

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Networking Operation

When several transmitters are connected to the same RS485 bus it is recommended to use separate power supplies for each transmitter. Make sure that the devices are grounded to the same potential. Otherwise harmful ground currents may be generated or RS-485 common-mode limits may be exceeded.

For long RS485 bus lengths a proper termination should be provided.

Setting the Transmitter Address

ADDR aa <cr> SAVE <cr>

aa=address (0...99)

Example (changing address from 0 to 1):

>addr ADDR : 0 ? 1 > >save EEPROM saved successfully. >

Open and Close

OPEN nn <cr>

nn=address of the transmitter (0...99) The OPEN command sets the bus temporarily in STOP mode so that the

SMODE command can be entered.

CLOSE <cr>

In STOP mode: Command OPEN has no effect, CLOSE sets the transmitter temporarily in POLL mode.

In POLL mode: Command OPEN sets the transmitter temporarily in STOP mode.

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Example:

>close

line closed GMP343: 1 line opened for operator commands >send

351.1 ppm

>smode stop SMODE : STOP >

Setting Echoing Mode

ECHO x <cr> SAVE <cr>

x=ON/OFF (default ON) In RS232 mode the device echoes everything back to the user. In RS485

mode echoing is automatically disabled.

Preparation for Network Operation

Before GMP343 is connected to the network it must be configured. Normal procedure is shown below:

First connect the device to PC by using RS-232 and when communication is currently open, key in the following commands:

RSMODE 485 ADDR addr

(where addr is 1...99)

SMODE POLL SAVE

Next turn the power off. Then you can connect the device to RS-485 network.

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Commands during Network Operation

When GMP343 is connected to the network, the following commands can be entered:

SEND addr Return latest CO2 value XP addr pressure Set pressure for compensation

XO addr oxygen Set oxygen for compensation XRH addr

humidity

OPEN addr Open device for normal communication (i.e. to

CLOSE Switch the device from STOP-mode to POLL-

Compensation values that are entered with compensation commands (XP, XO, XRH) are used for compensation but they are not stored permanently. Note that compensation commands do not give any reply. If value in command is not acceptable, the command is rejected.

Set humidity for compensation

STOP-mode)

mode.

Measurement Range, Data Filtering and Linearization

Setting the Measurement Range

The measurement range of the GMP343 has been set at factory according to the order form. However, you can change the measurement range to optimize measurement performance for a certain concentration level.

To achieve the most accurate 'ppm CO measurement should be compensated for T, P, %RH, and O2 concentration in the environment. The compensation settings are

specific to the selected measurement range, so selecting a suitable measurement range optimizes the compensation performance. Each range also has its own linearization function; see section Linearization

on page 46.

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' measurement, the

User's Guide ______________________________________________________________________

There are 6 measurement ranges available. The range always begins with zero and only upper end value is changed.

RANGE x SAVE

x = 1...6

Example:

>range 4

1. SPAN (ppm) : 1000.00

2. SPAN (ppm) : 2000.00

3. SPAN (ppm) : 3000.00

4. SPAN (ppm) : 4000.00

5. SPAN (ppm) : 5000.00

6. SPAN (ppm) : 20000.00

RANGE : 4 > >save EEPROM saved successfully.

NOTE

RANGE-command only optimizes measurement. The scaling of the analog output is an independent issue. Normally it is necessary to change also ALOW and AHIGH values. For more information, see section, Setting and Testing the Analog Outputs, on page 52.

Measurement Data Filtering

The raw measurement values (measurement interval = 2 seconds) are an input to a chain of three filters: a median, an averaging, and a smoothing filter. The filters can be individually enabled or disabled by setting the filter coefficient to 0 (zero) or by choosing CO2RAW instead of CO2 for

the measurement output quantity (see FORM command).

Figure 8 Entering Measurement Values

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Median Filter

Median filter is the first section in the filter chain, removing random peak values caused by external interference. The output of the median filter is the moving median of the values over the set number of measurements. The median filter arranges the values in the order of magnitude and outputs the middle value (not the average) if the number of the measurements is odd. In case an even number is set, the output is the average of the two middlemost measurements.

The lowest reasonable set number of measurements is 3. Note that if the noise distribution is somewhat uniform the median filter does not give any additional value.

The number of the measurements is set by the MEDIAN command. Maximum number of measurements is 13. The default value is 0 (meaning that the median filter is disabled).

Averaging Filter

The averaging filter calculates a moving average over the user-set period of time. The longer the averaging time is the lower the noise at the measurement signal. For example, if the averaging is set to 30 seconds, the most recent average filter output is the average of the last 15 measurements (2 seconds measurement interval).

The averaging time is set by the AVERAGE command. The default value is 10 seconds, and the maximum filter length is 60 seconds. For longer averaging times, use the smoothing filter instead. Table 6 on

page 43 presents the measurement noise as a function of averaging time

at 370 ppm CO2:

Table 6 Averaging Times

Averaging Time Noise

0 s 3 ppm 10 s 2 ppm 30 s 1 ppm

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Smoothing Filter

The smoothing filter calculates the running average by weighting the most recent measurement by the user-set proportion of the preceding measurement.

By using the smoothing filter, averaging up to even 15 minute periods can be accomplished. The smoothing filter is feasible for the background measurement where fast changes in the CO2 concentration

are not common. See the next section to find the difference between smoothing and averaging in regard to response time.

The smoothing factor is set by the SMOOTH command, where the range of the factor is 0 ... 255. The relationship between averaging and smoothing from the noise reducing point of view is like follows:

(SMOOTHING FACTOR × 4) = approx. AVERAGING TIME (s) The default value is 0 (meaning that the smoothing filter is disabled).

How the Filtering Affects the Response Time

The following figure illustrates the difference of the two filters in regard to time response. The averaging time is set to 40 seconds while the smoothing factor is set to 10 to have about equal noise rejection properties. See also the response time tables presented in Specifications,

Response time (90 %), on page 80.

Figure 9 The Difference of the Two Filters in Time Response

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Setting the Median Filter

Use the median filter to remove random peak values caused by possible external interference.

MEDIAN x <cr> SAVE <cr>

x=0...13 (default=0)

>median 3 MEDIAN : 3 >save EEPROM saved successfully (829 ms). >

Setting the Averaging Filter

Use the averaging filter to reduce the noise of the measurement. Notice the effect on the response time.

AVERAGE x <cr> SAVE <cr>

x=0...60 seconds (default =10 s)

>average 20 AVERAGING (s) : 20 >save EEPROM saved successfully (829 ms). >

Setting the Smoothing Filter

Use the smoothing filter to reduce the noise of the measurement for long averaging periods. Notice the effect on the response time.

SMOOTH x <cr> SAVE <cr>

x=0...255 (default =0)

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>smooth 10 SMOOTH : 10 >save EEPROM saved successfully (829 ms). >

Flushing the Filters (Resynchronization)

With this command you can flush the filters to get rid of the effect of the past measurements. This feature is useful if long filtering lengths are used.

RESYNC <cr>

>resync >

Linearization

Due to the principle of the CO2 absorption, the sensor of GMP343 produces a signal which is not linear in relation to the CO2 concentration. However, the output signal is linearized with the internal

linearization function. The user can disable the internal linearization function to achieve a signal proportional to the absorption.

Setting the Linearization ON/OFF

LINEAR x <cr> SAVE <cr>

x=ON or OFF (default=ON)

Example:

>linear LINEAR : ON ? > >save EEPROM saved successfully.

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Temperature, Pressure, Relative Humidity, and Oxygen Compensations

The measurement result of an NDIR CO2 sensor such as the GMP343 is proportional to the absolute number of CO2 molecules in the active volume of the sensor. Hence, according to the ideal gas law, the 'ppm

CO2' output is pressure and temperature dependent. Additionally, background gases such as humidity and oxygen have an effect on the

absorption strength of CO2.

The factory calibration of GMP343 is carried out using dry N2 and CO2 mixtures. In other words, the relative humidity and the oxygen

concentration of the calibration gases are 0 %. To achieve the most accurate 'ppm CO

measurement should be compensated for T, P, % RH, and O concentration in the environment. In GMP343 these compensations are

a built-in option. The compensated output corresponds to 'ppm CO2' in the actual environment (T, P, RH, and O2). The temperature, pressure, relative humidity, and oxygen compensations are enabled as a factory

default (default environmental parameters: pressure 1013 hPa, relative humidity 50 % RH, oxygen 20.95 % O2). The compensation settings are

specific to the selected measurement range, so selecting a suitable measurement range also optimizes the compensation performance.

The compensation algorithm of GMP343 eliminates the dependences of the CO

measurement or the instrument itself. The temperature compensation of GMP343 is based on built-in temperature sensor while the values of the other environmental parameters should be changed by the user, if they vary from the default.

Note, that from the measurement accuracy point of view, the effect of humidity and oxygen is less significant compared to the effect of temperature and pressure.

measurement, whether they are related to the physics of the

' measurement, the

Without compensation, the effect of oxygen on the CO approximately - 0.09 % of reading / % O2. In most circumstances, the oxygen concentration does not vary from the default, so normally there

is no need to change the oxygen concentration settings.

VAISALA_______________________________________________________________________ 47

reading is

User's Guide ______________________________________________________________________

Without compensation, the effect of humidity on the CO2 reading is approximately 0.05 % of reading / g/m3 H2O. Since relative humidity is

strongly dependent on temperature, the humidity dependence is in terms of absolute humidity, g/m3 H2O.

Compensation of each environmental parameter can be disabled/ enabled individually by setting the corresponding software parameter 'OFF' or 'ON', or by choosing CO2RAWUC for the measurement quantity (see FORM command).

The internal compensation of GMP343 is the most accurate way to compensate for changing environmental parameters. However, if more information is needed on different compensations, please contact your Vaisala representative.

Temperature Compensation ON/ OFF

The internal temperature sensor is located in the measurement chamber. Temperature compensation is done automatically unless for some reason you want to take the compensation feature off.

To enable or disable temperature compensation, use the commands:

TC x <cr> SAVE <cr>

x=ON/OFF (default =ON)

>tc on TC : ON >tc off TC : OFF > >save EEPROM saved successfully. >

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Chapter 4 ________________________________________________________________ Operation

Setting the Oxygen Concentration

To set the oxygen concentration value, use the commands:

O x <cr> SAVE <cr>

x=0...100 % (default =20.95 %)

>o 21 OXYGEN (%): 21.00 >save EEPROM saved successfully. >

Setting Oxygen When the Device Is in POLL-mode

To set oxygen value in POLL-mode, use the following addressable command:

XO addr x <cr>

The device does not reply to the command. If given oxygen value is not within limits, the command is rejected. The given value is written to volatile memory, where it will be overwritten either by next XO- command or O-command. At start the first compensation value is a value given by O-command if it was saved by SAVE-command. Purpose of the XO-command is continuous update of compensation value sent by another measurement device.

Oxygen Compensation Mode

To enable or disable the oxygen compensation, use the commands:

OC x <cr> SAVE <cr>

x=ON/OFF (default =ON)

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User's Guide ______________________________________________________________________

NOTE

Check that the ambient pressure value is correct. The correct pressure value is needed for oxygen compensation even if the pressure compensation is disabled.

>oc on OC: ON > >save EEPROM saved successfully. >

Setting the Ambient Pressure (hPa)

The pressure value is needed in pressure, humidity, and oxygen compensations. To set the ambient pressure value, use the commands:

P x <cr> SAVE <cr>

x=700...1300 hPa (default =1013 hPa) Sets ambient pressure (hPa) to be used in compensation calculations.

>p 1100 PRESSURE (hPa)): 1100.000 >p PRESSURE (hPa) : 1100.000 ? > >save EEPROM saved successfully. >

Setting Pressure When the Device Is in POLL-mode

To set pressure value in POLL-mode, use the following addressable command:

XP addr x <cr>

The device does not reply to the command. If given pressure value is not within limits, the command is rejected. The given value is written to volatile memory, where it will be overwritten either by next XP- command or P-command. At start the first compensation value is a

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Chapter 4 ________________________________________________________________ Operation

value given by P-command if it was saved by SAVE-command. Purpose of the XP-command is continuous update of compensation value sent by another measurement device.

Pressure Compensation ON/OFF

To enable or disable the pressure compensation, use the commands:

PC x <cr> SAVE <cr>

x=ON/OFF (default =ON)

>pc off PC: OFF >pc on PC : ON ? >save EEPROM saved successfully. >

Setting Ambient Relative Humidity

To set the ambient relative humidity value, use the commands:

RH x <cr> SAVE <cr>

x=0 ... 100 % RH (default =50 %)

>rh HUMIDITY (%RH): 0.00 ? 24 >save EEPROM saved successfully. >

Setting Humidity When the Device Is in POLL-mode

To set relative humidity value in POLL-mode, use the following addressable command:

XRH addr x <cr>

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User's Guide ______________________________________________________________________

The device does not reply to the command. If given humidity value is not within limits, the command is rejected. The given value is written to volatile memory, where it will be overwritten either by next XRH- command or RH-command. At start the first compensation value is a value given by RH-command if it was saved by SAVE-command. Purpose of the XRH-command is continuous update of compensation value sent by another measurement device.

Relative Humidity Compensation ON/OFF

To enable or disable the humidity compensation, use the commands:

RHC x <cr> SAVE <cr>

x=ON/OFF (default =ON)

NOTE

Check that the ambient pressure value is correct. The correct pressure value is needed for RH compensation even if the pressure compensation is disabled.

>rhc on RHC : ON >rhc off RHC : OFF > >save EEPROM saved successfully. >

Setting and Testing the Analog Outputs

GMP343 has one analog output channel. The channel outputs either current or voltage signal according to the order configuration. The analog output always gives the filtered CO2 results regardless of the

quantity set with FORM command.

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Chapter 4 ________________________________________________________________ Operation

Analog Output Hardware

AMODE <cr> SAVE <cr>

Analog output hardware can be chosen between current or voltage output. Command parameters are correspondingly I (for current) and U (for voltage).

>amode AMODE : I ? U > >save EEPROM saved successfully. >

You can scale the chosen analog output signal as follows:

- When you have current output, you can set any value between 0 ... 4 mA for the current signal low level. The default value is 4 mA (command ILOW). The high value is always 20 mA.

- When you have voltage output, you can set any value between 0 ... 5 for the voltage signal high level (command UHIGH). The low value is always 0 V.

Remember to set the analog output error value within the range of current/voltage output. See the command AERR.

The concentration range of the analog output, corresponding to the signal range set above, can be chosen by determining the low and high values for the measurement range (AHIGH, ALOW).

Setting the Limit of the Current Output Range

You can expand the current output range for example 4...20 mA to

0...20 mA. The range available is 0...4 mA.

ILOW <cr> SAVE <cr>

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User's Guide ______________________________________________________________________

Key in the low current value (mA) and press ENTER.

>ilow ILOW (mA) : 4.000 ? 0 >save EEPROM saved successfully. >

Setting the High Limit of the Voltage Output Range

You can set the hight voltage value: 0...5 V.

UHIGH <cr> SAVE <cr> Key in the high voltage value (V) and press ENTER.

>uhigh UHIGH (V) : 5.000 ? 1 > >save EEPROM saved successfully. >

Setting the High Limit of the Concentration Range

Sets the hight CO2 concentration value, which corresponds to the analog output high value.

AHIGH <cr> SAVE <cr> Key in the highest concentration value (ppm) and press ENTER.

>ahigh AHIGH (ppm) : 1000.0 ? 1200 > >save EEPROM saved successfully. >

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Chapter 4 ________________________________________________________________ Operation

Setting the Low Limit of the Concentration Range

Sets the low CO2 concentration value, which corresponds to the analog output low value.

ALOW <cr> SAVE <cr> Key in the lowest concentration value (ppm) and press ENTER.

>alow ALOW (ppm) : 0.0 ? 20 > >save EEPROM saved successfully. >

Setting the Analog Output Overrange Clip

This command clips the analog output signal at the high value when the signal goes over range. In case of the current output the current will not go higher than 20 mA or below the low value current (set with ILOW). The voltage output will not go higher than the voltage set with UHIGH.

ACUT x <cr> SAVE <cr>

x=ON/OFF

>acut ACUT : OFF ? ON >acut ACUT : ON ? OFF > >save EEPROM saved successfully. >

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User's Guide ______________________________________________________________________

Testing the Analog Output

When you want to test the operation of the analog output use this command to force the output to the set value. The value in the analog output can then be measured with a current/voltage meter. The set value remains valid until you give the ATEST command without a value or

RESET the transmitter. ATEST <cr>

x=the given test value (mA or V)

>atest 1 Test voltage set at 1 V. Use command without any parameters to stop test mode. >atest Voltage test mode stopped.

Setting the Analog Output Error Level

Factory default states for analog outputs during error condition are the maximum values of the measuring range=2.5 V / 5 V / 20 mA.

AERR x <cr> SAVE <cr>

x=error value (mA) or (V) Acceptable ranges: 0...20 mA, 0...6 V Example:

>aerr AERR (V) : 5.000 ? 0 > >save EEPROM saved successfully. >

NOTE

The error output value must be within a valid range for current (0...20 mA) or voltage output (0...6 V) regardless of the UHIGH setting.

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Chapter 4 ________________________________________________________________ Operation

Device Information and Other General Commands

Device Information List

This command outputs the information about the device.

? <cr>

This command outputs the information about the device even in POLLmode.

?? <cr>

>?? GMP343 / 2P0.33 SNUM : Y3040008 CALIBRATION : 2007-04-20 CAL. INFO : Vaisala Oyj SPAN (ppm) : 4000 PRESSURE (hPa) : 1013.000 HUMIDITY (%RH) : 50.00 OXYGEN (%) : 20.95 PC : ON RHC : OFF TC : ON OC : OFF ADDR : 0 ECHO : ON SERI : 19200 8 NONE 1 SMODE : STOP INTV : 1 S

Show the Output Quantities

Lists the parameter abbreviations to be used in FORM command. CALCS <cr>

>calcs CO2 - Filtered CO2 CO2RAW - Raw CO2 CO2RAWUC - Uncompensated raw CO2 TIME - Time since last reset ADDR - Device address

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User's Guide ______________________________________________________________________

ERR - Error flag T - Gas temperature P - User-set pressure value RH - User-set relative humidity value O - User-set oxygen value

Linear and Multipoint Corrections

Shows the last linear and multipoint correction values.

CORR <cr>

>corr LC : OFF

Linear correction Reading Reference

0.00 0.000

1000.00 1000.000

MPC : OFF

Multipoint correction Reading Reference

0.00 0.000

1000.00 1000.000 >

Error Messages

The ERRS command shows the error messages received. For a list of possible errors, refer to Table 7 on page 74.

ERRS <cr>

>errs No errors detected. >errs ERROR E02: IR source failure. ERROR E06: Temperature measurement failure (recovered 1 h 9 min ago). WARNING W01: Watchdog reset. >

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The ERRS R command resets the error states. ERRS R <cr>

>errs r

OK: No errors detected. Error states cleared.

Command List

This command displays a list of all the commands.

HELP <cr>

Showing the Parameters

PARAM <cr>

>param RSMODE : 232 ADDR : 0 SERI : 19200 8 NONE 1 SMODE : STOP FORM : CO2 \r \n INTV : 1 S ECHO : ON

AMODE : U ACUT : ON AERR (V) : 2.50 AHIGH (ppm) : 3000.00 ALOW (ppm) : 0.00 ILOW (mA) : 4.00 UHIGH (V) : 2.50

RANGE : 4 MEDIAN : 0 AVERAGE (s) : 30 SMOOTH : 0 LINEAR : ON LC : OFF MPC : OFF HEAT : OFF

OXYGEN (%) : 20.95 PRESSURE (hPa) : 1013.000 HUMIDITY (%RH) : 50.00

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User's Guide ______________________________________________________________________

OC : OFF PC : ON RHC : OFF TC : ON

Software Version Information

VERS <cr>

>vers GMP343 / 2P0.33 >

Memory Handling

Reverting the Factory Parameters

Use this command to revert the original factory settings.

>factory Parameters loaded from Flash. >

Remember to check the settings after using this command.

Saving the Setting

SAVE <cr>

Saves the parameters and settings to EEPROM memory.

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Setting the Optics Heating ON/OFF

Enables or disables optics heating.

HEAT <cr>

x=ON or OFF (default =ON)

Example:

>heat HEAT : ON ? off >

Resetting the Transmitter

RESET <cr>

This command resets the device. If the device is in RUN mode, outputting the results starts immediately after resetting.

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Chapter 5 __________________________________________________ Calibration and Adjustment

CHAPTER 5

CALIBRATION AND ADJUSTMENT

This chapter contains information for performing the calibration and adjustment of the GMP343.

In this user's guide the term calibration means comparing the transmitter's reading to a reference concentration. Adjustment, which is usually done after calibration, the reading of the transmitter is changed to correspond to the reference concentration. After adjustment, the original calibration certificate shipped with the product is not valid anymore.

The GMP343 can be sent to Vaisala for calibration, or be calibrated by the user.

Calibration Interval

GMP343 is calibrated as shipped from the factory. The recommended calibration interval is one year. The operating conditions affect the long-term stability. For more information, see Specifications, Operating

Conditions, on page 81 and, Performance, on page 77 (long-term

stability). In a harsh operating environment it is recommended to check readings more often than in an easy environment.

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User's Guide ______________________________________________________________________

Factory Calibration and Adjustment

You can send the device to Vaisala Service Center for calibration and adjustment, for more information, see, Vaisala Service Centers, on page

76.

Calibration and Adjustment by the User

Calibration and adjustment are carried out by using the serial communications and the calibration gas(es).

Additional equipment needed:

- power supply 11...36 VDC

- PC and PC connection cable (Vaisala order code 213379) with optional USB adapter (Vaisala order code 219686)

- calibration gases and tubing

- calibration adapter is required for calibrating the diffusion model (Vaisala order code GMP343ADAPTER)

- pressure regulator and flow meter

- barometer (for measuring ambient pressure)

Calibration (Checking)

The gas concentration of the reference gases must cover the measurement range of the device.

Checking the Compensations

1. Connect GMP343 to a PC and open the terminal program. For more information, see section Connecting GMP343 to PC on page

29.

2. Connect the 24 VDC supply power to GMP343.

3. Compensations must always be enabled during the calibration procedure. Use the ? command to verify the status of the compensations for ambient pressure, temperature, relative humidity, and oxygen concentration:

?<cr>

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Chapter 5 __________________________________________________ Calibration and Adjustment

4. If all compensations are not enabled, make note of the current settings so that you can restore them after the calibration if desired. Then issue the following commands to enable the compensations:

PC ON<cr> TC ON<cr> RHC ON<cr> OC ON<cr>

5. You must also set the ambient pressure, relative humidity, and oxygen concentration values of the calibration gas correctly. Typically the relative humidity of the calibration gases is 0 % RH. Oxygen concentration of nitrogen mixture gases is usually 0 %. If necessary, adjust the values. For example:

P 1000.3<cr> RH 0<cr> O 0<cr>

For more information on compensations, see section Temperature,

Pressure, Relative Humidity, and Oxygen Compensations on page

47.

Measurements in Reference Gases

1. If your GMP343 is the diffusion model, remove the filter cover and place the calibration adapter onto the probe.

2. Let the device warm up for 30 minutes to achieve full calibration accuracy.

3. Turn on the calibration mode by giving the command CALIB ON. This changes some of the transmitter parameters for the duration of the calibration.

CALIB ON <cr>

4. Connect the reference gas to the inlet of GMP343 transmitter and let the gas flow for 5 minutes (about 0.5 l / min).

5. To output the measurement result, key in the command R. Check that the reading is stabilized and write down the CO2 reading

(ppm). Enter command S to stop outputting. For the best calibration result, it is recommended to calculate an average of 20 measurements instead of a single reading.

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User's Guide ______________________________________________________________________

6. Shut off the reference gas flow and remove the tubings from the gas bottle. When calibrating at several points, connect the other gases to GMP343 similar to the first gas and carry out the measurements as instructed above (steps 6 and 7).

7. After measurements turn off the calibration mode by giving the command CALIB OFF (this reverts to the original transmitter settings).

CALIB OFF <cr>

Adjustment in 1...2 Points

First carry out checking the compensations and perform the reference gas measurements as instructed in the previous section, Calibration and

Adjustment by the User on page 64. Then continue as follows:

1. Key in the command

LCI <cr>

2. Key in the reading at the reference gas (ppm) and press ENTER (1.Reading?).

3. Key in the reference gas concentration (ppm) and press ENTER (Reference?).

4. When making a one-point calibration press ENTER again and go to step 6 in this list. When making a two-point calibration, key in the reading at the second reference gas and press ENTER (2.Reading?).

5. Key in the reference gas 2 concentration (ppm) and press ENTER (Reference?).

6. Now the correction values are calculated, but the adjustment is not valid until the correction is confirmed.

7. Confirm the new correction values with the command

LC ON <cr>

8. Use the command R to check with both reference gases that the correction has taken place and the readings are ok.

9. Save the settings:

SAVE <cr>

10. Saves parameters and settings to EEPROM memory.

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Chapter 5 __________________________________________________ Calibration and Adjustment

Adjustment in 3...8 Points

First carry out checking the compensations and perform the reference gas measurements as instructed in the previous section, Calibration and

Adjustment by the User on page 64. Then continue as follows:

1. Feed the readings (Reading?) and the corresponding concentrations (Reference?) with the command

MPCI <cr>

2. Confirm the adjustment and the new correction values with the command

MPC ON <cr>

3. Save the settings with the command

SAVE <cr>

4. Saves parameters and settings to EEPROM-memory.

NOTE

Example of the 2-Point Adjustment Procedure

The following section presents an example of the 2-point adjustment procedure with reference gas concentrations of 0 ppm and 1007 ppm.

Use the actual concentrations given usually in the side of the gas bottle. For example, a gas with a nominal 1000 ppm CO2 concentration might actually contain 1007 ppm CO2.

1. First turn on the calibration mode for measuring reference gases.

> >calib on Calibration mode started. Use CALIB OFF to stop the mode.

2. The GMP is now measuring the first reference gas (0 ppm). Use command R and let the reading stabilize for several minutes. Calculate the average reading (reading 1).

>r ...28.2

28.2

28.1

28.2

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User's Guide ______________________________________________________________________

3. The GMP343 is now measuring the second reference gas (1007 ppm). Use command R and let the reading stabilize for several minutes. Calculate the average reading (reading 2).

> >r

1067.1

1066.8

1067.2

1066.7

1066.6

4. Turn off the calibration mode with command CALIB OFF.

>calib off Calibration mode stopped.

5. Next feed the readings: use command LCI to feed the first and second reference gas readings (28 ppm and 1066 ppm), and the corrected values (= the concentrations of the reference gases, 0 ppm and 1007 ppm).

>lci

Reading Reference

0.00 0.000

1000.00 1000.000

NOTE: Entering new correction values all previous correction points! Abort without losing correction points by using ESC.

1. Reading ? 28

Reference ? 0

2. Reading? 1066

Reference? 1007

6. Confirm the adjustment with command LC ON.

>lc LC : OFF ? on

7. Check the reading with the second reference gas, 1007 ppm.

1005.4

1006.2

1007.1

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Chapter 5 __________________________________________________ Calibration and Adjustment

8. Check the reading with the first reference gas, 0 ppm.

0.2

0.1

-0.1

-0.0

-0.2

9. Save the settings.

save> EEPROM saved successfully.

NOTE

The factory settings can be reverted with the command FACTORY.

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Chapter 6 ______________________________________________________________ Maintenance

CHAPTER 6

MAINTENANCE

This chapter instructs in the basic maintenance of the GMP343.

Cleaning the Optics (Diffusion Model Only)

0704-021

Figure 10 Optics

The following numbers refer to Figure 10 on page 71: 1=Mirror 2 = Window

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User's Guide ______________________________________________________________________

NOTE

Handle the diffusion filter carefully to prevent contaminants or mechanical stress from damaging the filtering surface.

1. Rotate and remove the filter cover.

2. Take a firm hold on the frame of the diffusion filter, and pull it out. Note that the threads for the filter cover are sharp.

3. Blow on the mirror and window area with instrument air to remove any loose particles. In case there is still some dirt on the surfaces, proceed to step 3.

4. Pour some distilled water on the optical surfaces so that they are covered with water. Pour out the excess water.

5. Take a piece of soft, clean paper tissue (optical or clean room grade tissue) and gently dry the surface with rotating movements.

6. If the mirror and/or window surface still seems dirty after water cleaning, clean the dirty surface with pure ethanol or isopropyl alcohol. Pour out the excess liquid carefully.

After cleaning the surfaces should appear clear, without any oily stains, spots, or dust.

7. After cleaning, replace the diffusion filter. Push the end of the filter gently to snap it into place.

8. Replace the filter cover.

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Chapter 6 ______________________________________________________________ Maintenance

Changing the Filter (Diffusion Model Only)

The diffusion filter should be changed when it looks dirty. A new standard diffusion filter and filter cover can be ordered from Vaisala with the order code GMP343FILTER.

NOTE

Handle the diffusion filter carefully to prevent contaminants or mechanical stress from damaging the filtering surface.

1. Rotate and remove the filter cover.

2. Take a firm hold on the frame of the diffusion filter, and pull it out. Note that the threads for the filter cover are sharp.

3. Insert a new diffusion filter. Push the end of the diffusion filter gently to snap it into place.

4. Replace the filter cover.

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Error States

In case of an error function the outputs are as follows:

- Serial line: In STOP mode the error code and description (see the Table 6 below) is shown when keying in the command: ERRS. In POLL or RUN mode the error flag is set to 1 (if the error flag is included in the message format, see FORM-command). Reset the error state with a command ERRS R.

- Analog output shows the error level (can be set by using the

AERR-command. Factory setting: 5 V or 20 mA).

Table 7 Troubleshooting Errors

Error code Error description Interpretation Action

E01 EEPROM checksum

failure

E02 IR source failure Internal transmitter

E03 FPI failure Internal transmitter

E04, E05 Heater failure Internal transmitter

E06 Temperature

measurement failure

E07 Measurement signal

level too low

W01 Watchdog reset occured Software defect In case this warning

W01 Stack overflow Software defect In case this warning

Internal transmitter failure

failure

failure Operation temperature

is out of allowed range. Analog output: Error level is shown if temperature compensation is enabled. Otherwise, output is normal.

Measurement chamber is contamined or the lamp is degraded.

Return the device to Vaisala Service

Return the device to Vaisala Service.

Ensure that the operating temperature is -45...+85 °C (-

49...185 °F). In case of constant error, return the device to Vaisala Service.

Clean the optics and the filter according to the instructions in section

Cleaning the Optics (Diffusion Model Only) on page 71. In case of

constant error, return the device to Vaisala Service.

appears frequently, return the device to Vaisala Service.

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Chapter 6 ______________________________________________________________ Maintenance

In all error cases first check that the probe is connected properly, then reset the transmitter by disconnecting it. In case of constant error, please contact a Vaisala Service Center. See section Vaisala Service Centers

on page 76.

CAUTION

Please note that there are no user-serviceable parts inside the GMP343 transmitter body. The back flange shall not be opened except by authorized Vaisala service personnel.

Technical Support

For technical questions, contact the Vaisala technical support: E-mail helpdesk@vaisala.com Fax +358 9 8949 2790

Return Instructions

If the product needs repair, please follow the instructions below to speed up the process and to avoid extra costs to you.

1. Read the section Warranty on page 11.

2. Contact a Vaisala Service Center or a local Vaisala representative. The latest contact information and instructions are available from

www.vaisala.com/returns. Addresses of the Service Centers are

provided in section Vaisala Service Centers on page 76. Please have the following information on hand:

- serial number of the unit

- date and place of purchase or last calibration

- description of the fault

- circumstances in which the fault occurs/occurred

- name and contact information of a technically competent

person who can provide further information on the problem

3. Pack the faulty product in a strong box of adequate size, with proper cushioning material to avoid damage.

4. Include the information specified in step 2 in the box with the faulty product. Also include a detailed return address.

5. Ship the box to the address specified by your Vaisala contact.

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Vaisala Service Centers

The GMP343 has been calibrated by Vaisala prior to shipping. The recommended calibration interval is one year. Vaisala Service Centers perform calibrations and adjustments as well as repair and spare part services. See contact information below.

Vaisala Service Centers also offer accredited calibrations, maintenance contracts, and a calibration reminder program. Do not hesitate to contact them to get further information.

NORTH AMERICAN SERVICE CENTER

Vaisala Inc., 10-D Gill Street, Woburn, MA 01801-1068, USA.

Phone: +1 781 933 4500, Fax: +1 781 933 8029 E-mail: us-customersupport@vaisala.com

EUROPEAN SERVICE CENTER

Vaisala Instruments Service, Vanha Nurmijärventie 21 FIN-01670 Vantaa, FINLAND.

Phone: +358 9 8949 2658, Fax: +358 9 8949 2295

E-mail: instruments.service@vaisala.com

TOKYO SERVICE CENTER

Vaisala KK, 42 Kagurazaka 6-Chome, Shinjuku-Ku, Tokyo 162-0825, JAPAN.

Phone: +81 3 3266 9617, Fax: +81 3 3266 9655 E-mail: aftersales.asia@vaisala.com

BEIJING SERVICE CENTER

Vaisala China Ltd., Floor 2 EAS Building, No. 21 Xiao Yun Road, Dongsanhuan Beilu,

Chaoyang District, Beijing, P.R. CHINA 100027. Phone: +86 10 8526 1199, Fax: +86 10 8526 1155 E-mail: china.service@vaisala.com

www.vaisala.com

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Chapter 7 ____________________________________________________________ Technical Data

CHAPTER 7

TECHNICAL DATA

This chapter provides the technical data of the GMP343.

Performance

Sensor Measuring principle Single-Beam Dual-Wavelength NDIR

Measurement range options 0 ... 1000 ppm

Accuracy (excluding noise) at 25 °C and 1013 hPa after factory calibration with 0.5 % accurate gases with different range options

* Accuracy below 200 ppm CO2 not specified for the 2 % range option

Vaisala CARBOCAP

0 ... 2000 ppm 0 ... 3000 ppm 0 ... 4000 ppm 0 ... 5000 ppm 0 ... 2 %

0 ... 1000 ppm 0 ... 2000 ppm - 0 ... 2 %*

± (3 ppm CO2 + 1 % of reading) ± (5 ppm CO2 + 2 % of reading)

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User's Guide ______________________________________________________________________

Noise (repeatability) at 370 ppm CO

Short-term stability (up to 6 hours) at 370 ppm CO

Long-term stability In easy operating conditions

with no output averaging with 30 s output averaging

In moderate oper. conditions In harsh operating conditions

± 3 ppm CO ± 1 ppm CO

± 1 ppm CO

2 2

< 2 % of reading / year < 2 % of reading / 6 months < 2 % of reading / 3 months

See the graph in section Operating Conditions on page 81.

Effects of Temperature, Pressure, Relative Humidity, and Oxygen

The temperature compensation of GMP343 is based on the built-in Pt1000 temperature sensor. The values of pressure, relative humidity, and oxygen must be input by the user, if they vary from the default.

Temperature

Table 8 Effect of Temperature on Accuracy with

Temperature Compensation

CO2 range option 0 ... 1000 ppm 0 ... 2000 - 5000 ppm 0 ... 2 %

Temperature (°C) Accuracy (% of reading)

-10 ... +40

-40 ... +60

The specifications in the table above are valid when temperature change is < 1 °C / min. If optics heating is in use, the > 500 ppm accuracy values should be multiplied by a factor of 2.

For readings below 200 ppm CO

Effect on accuracy without compensation (typ.):

- 0.35 % of reading / °C

± 0.5

± 2

: ± 5 ppm CO

± 1 ± 3

± 2 ± 4

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Chapter 7 ____________________________________________________________ Technical Data

Pressure

Table 9 Effect of Pressure on Accuracy with Pressure

Compensation

CO2 range option 0 ... 1000 ppm 0 ... 2000 ppm - 2 %

Pressure (hPa) Accuracy (% of reading)

900 ... 1050 700 ... 1300

± 0.5

± 1

± 1 ± 2

Effect on accuracy without compensation (typ.): + 0.15 % of reading /hPa

Humidity

Effect on accuracy with humidity compensation:

± 0.006 % of reading / g/m3 H2O below 1000 ppm CO ± 0.02 % of reading / g/m3 H2O above 1000 ppm CO

The values above only apply in normal ambient pressure. Effect on accuracy without humidity compensation (typ.):

+ 0.05 % of reading / g/m3 H2O

For more information on operating humidity range, see the graph in section, Operating Conditions, on page 81.

Oxygen

Effect on accuracy with oxygen compensation at 20.9 %O2:

± 0.2 % of reading

Effect on accuracy without oxygen compensation (typ.):

- 0.09 % of reading / %O

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Response time (90 %)

Table 10 Diffusion Model

Filter attached Averaging (s) Response (s)

Yes 0 75 Yes 10 80 Yes 30 82

No 0 < 2 No 10 12 No 30 30

Table 11 Flow-through Model

Gas flow (l/min) Averaging (s) Response (s)

0.3 0 26

0.3 10 34

0.3 30 44

1.2 0 8

1.2 10 15

1.2 30 23

Flow dependence of flow-

0.3 % of reading / 1 / min

through model Warm-up time full accuracy ± 0.5 %

full accuracy

< 10 min < 30 min

Inputs and Outputs

Operation voltage 11 ... 36 VDC Power consumption without heating < 1 W

with heating max 3.5 W Analog outputs Current output range

resolution max load

Voltage output range

resolution min. load

4 ... 20 mA

14 bits

800 ohm @ 24 VDC

150 ohm @ 10 VDC

0 ... 2.5 V, 0 ... 5 V

14 bits (13 bits with 0...2.5 V)

5 kohm T emperature dependence of the

± 0.005 % of reading / °C analog outputs

Digital outputs RS232, RS485 (two-wire)

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Chapter 7 ____________________________________________________________ Technical Data

Operating Conditions

The GMP343 operating conditions in terms of temperature (T) and relative humidity (RH) are illustrated in the following graph:

0704-024

Figure 11 GMP343 Operating Conditions

Temperature continuous operation

storage

-40 ... +60 °C

-40 ... +70 °C

Pressure pressure range with compensation 700 ... 1300

hPa

mechanical durability 0 ... 5 bar Relative humidity 0 ... 100 %RH Oxygen 0 ... 100 %O

Gas flow rate for flow-through model < 10 litres / min Internal volume of the measurement

59 ml ± 1 ml

chamber of flow-through model Electromagnetic compatibility Complies with EMC standard

EN61326-1:1997+Am1:1998, Generic Environment

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User's Guide ______________________________________________________________________

Materials

Housing anodized aluminium Filter cover polycarbonate Filters PTFE IP classification Housing (cable attached)

Diffusion filter (weather protection) Diffusion filter (sintered PTFE)

IP67 IP65

IP66 Cable connector type 8-pin M12 Weight (probe only) 360 g

Spare Parts and Accessories

Table 12 List of Spare Parts and Accessories

Description Order code

Wall mounting bracket GMP343BRACKET Mounting flange GMP343FLANGE Standard diffusion filter (weather protection, IP65) + filter cover GMP343FILTER Diffusion filter (sintered PTFE filter, IP66) + filter cover 215521 Calibration adapter (for the diffusion model) GMP343ADAPTER Junction box JUNCTIONBOX-8 Probe cable with M12 female connector, 2 m GMP343Z200SP Probe cable with M12 female connector, 6 m GMP343Z600SP Probe cable with M12 female connector, 10 m GMP343Z1000SP PC connection cable, 2 m 213379 USB adapter (USB-D9 serial connection cable) 219686 Interface cable for MI70, 2 m DRW216050SP Soil adapter kit for horizontal positioning (includes sintered PTFE filter) 215519 Soil adapter kit for vertical positioning (includes sintered PTFE filter) 215520

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Appendix A ______________________________________________________________ Dimensions

APPENDIX A

DIMENSIONS

This appendix contains the dimension drawings for the GMP343.

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User's Guide ______________________________________________________________________

GMP343 (Flow-through)

1.77 45

49.0

88.6

571

881

4.7

2.17 55

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Appendix A ______________________________________________________________ Dimensions

GMP343 (Diffusion)

2.07

52.5

31.7

181

46.7

491

2.17 55

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User's Guide ______________________________________________________________________

Calibration Cap

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Appendix A ______________________________________________________________ Dimensions

Mounting Flange

VAISALA_______________________________________________________________________ 87

User's Guide ______________________________________________________________________

Junction Box

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Appendix A ______________________________________________________________ Dimensions

Mounting Bracket

VAISALA_______________________________________________________________________ 89

User's Guide ______________________________________________________________________

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Appendix B _________________________________________________________ List of commands

APPENDIX B

LIST OF COMMANDS

This appendix lists the serial commands of the GMP343.

Measurement Commands

The bold text in the brackets is a default setting. Key in the commands with the keyboard of your computer and press enter. In this guide, <cr> stands for pressing ENTER.

R Start the continuous output S Stop the continuous output ECHO Turn the serial interface echo ON/OFF INTV Set the continuous output interval SEND Output the reading once SMODE Set the serial interface SERI Serial line settings (default 19200 8 NONE) baud: 300 ... 115200 ADDR Set the device address CLOSE Close the line to POLL mode OPEN Open temporarily connection to the POLL-mode device FORM Set the output format of SEND and R commands RSMODE Set the output hardware to use either RS-232 or RS-485

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Filtering Commands

AVERAGE Set the averaging filter SMOOTH Set the smoothing filter MEDIAN Set the median filter RESYNC Flush (clear) all the filters

P, T and RH Compensation Commands

P Set local pressure (hPa) for compensation PC Pressure compensation mode RH Set local humidity (% RH) for compensation RHC Humidity compensation mode TC Temperature compensation mode O Set the oxygen for compensation OC Oxygen compensation mode XP Set local pressure (hPa) for compensation (POLL-mode) XO Set oxygen for compensation (POLL-mode) XRH Set local humidity (% RH) for compensation (POLL-mode)

Device Handling Commands

RESET Reset device FACTORY Revert the factory parameters SAVE Save parameters to EEPROM

Device Information Display Commands

? Output the information about the device ?? Output the information about the device in POLL-state CALCS Display measured parameters CORR Display linear and multipoint corrections ERRS List the error messages

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Appendix B _________________________________________________________ List of commands

HELP List the commands on the current level PARAM Display parameters TIME Display or set time since reboot VERS Display the SW version information

Calibration Commands

CALIB ON Turn on the calibration mode CALIB OFF Turn off the calibration mode LC Linear correction mode LCI Enter linear correction MPC Multipoint correction mode MPCI Enter multipoint correction

Setting and Testing the Analog Outputs

AMODE Set analog output HW (current or voltage mode) AHIGH Analog output high concentration value ALOW Analog output low concentration value ACUT Analog output over range cut ILOW Analog output low current value UHIGH Analog output high voltage value AERR Change the analog error output value ATEST Test the analog outputs

Advanced Measurement Commands

LINEAR Set linearization ON/OFF HEAT Set optics heating ON/OFF RANGE Set measurement range to optimize performance

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94 __________________________________________________________________ M210514EN-C

*M210514

www.vaisala.com

vaisala GMP343 User Guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Table of Contents

About This Manual

Version Information

General Safety Considerations

Feedback

ESD Protection

Warranty

Introduction to GMP343

GMP343 Transmitter Components

User Configurable CO2 Measurement

Principle of Operation

Optics Heating

Gas Sampling

Diffusion Sampling

Flow-Through Sampling

Sampling System

Optional Accessories

MI70 Indicator Connection

Recharging the Battery Pack

Structure of the MI70 Indicator

Using MI70 as a Display

Introduction of Function Keys and Menu Structure

Initialization of MI70

Navigation in Menu

Using MI70 in Recording

Transferring Recorded Data to PC

Mounting

Wiring

Wiring of the Junction Box

Connecting GMP343 to PC

Connection Cables

Installing the Driver for the USB Cable

Opening a Terminal Connection

Operation modes of the GMP343

Getting the Measurement Message

Measurement Units

Starting the Continuous Outputting

Stopping the Continuous Outputting

Setting the Continuous Outputting Interval

Outputting the Reading Once

Setting the Serial Interface Measurement Mode

Setting Communication Hardware

Serial Communication Settings

Formatting the Measurement Message

Formatting the Message

Setting Time

Networking Operation

Setting the Transmitter Address

Open and Close

Setting Echoing Mode

Preparation for Network Operation

Commands during Network Operation

Measurement Range, Data Filtering and Linearization

Setting the Measurement Range

Measurement Data Filtering

Median Filter

Averaging Filter

Smoothing Filter

How the Filtering Affects the Response Time

Setting the Median Filter

Setting the Averaging Filter

Setting the Smoothing Filter

Flushing the Filters (Resynchronization)

Linearization

Setting the Linearization ON/OFF

Temperature, Pressure, Relative Humidity, and Oxygen Compensations

Temperature Compensation ON/ OFF

Setting the Oxygen Concentration

Setting Oxygen When the Device Is in POLL-mode

Oxygen Compensation Mode

Setting the Ambient Pressure (hPa)

Setting Pressure When the Device Is in POLL-mode

Pressure Compensation ON/OFF

Setting Ambient Relative Humidity

Setting Humidity When the Device Is in POLL-mode

Relative Humidity Compensation ON/OFF