Vaisala GMP343 User Manual

USER’S GUIDE

Vaisala CARBOCAP® Carbon Dioxide

Probe GMP343

M210514EN-E

PUBLISHED BY

Vaisala Oyj Phone (int.): [phone]
P.O. Box 26 Fax: [phone]
FI-00421 Helsinki
Finland

Visit our Internet pages at www.vaisala.com

© Vaisala 2013

No part of this manual may be reproduced, published or publicly displayed
in any form or by any means, electronic or mechanical (including
photocopying), nor may its contents be modified, translated, adapted, sold
or disclosed to a third party without prior written permission of the
copyright holder. Translated manuals and translated portions of
multilingual documents are based on the original English versions. In
ambiguous cases, the English versions are applicable, not the translations.

The contents of this manual are subject to change without prior notice.

This manual does not create any legally binding obligations for Vaisala
towards customers or end users. All legally binding obligations and
agreements are included exclusively in the applicable supply contract or
the General Conditions of Sale and General Conditions of Service of
Vaisala.

________________________________________________________________________________

Table of Contents

CHAPTER 1

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

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

Contents of This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Version Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Documentation Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

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

Recycling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Regulatory Compliances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

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

CHAPTER 2

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

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

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

User Configurable CO2 Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

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

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

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

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

Flow-Through Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

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

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

Soil Adapter Kits for In-Soil Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

MI70 Indicator Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Recharging the Battery Pack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Structure of the MI70 Indicator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Using MI70 as a Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Introduction of Function Keys and Menu Structure. . . . . . . . . . . . . . . . . . . . . 20

Initialization of MI70 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Navigation in Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Using MI70 in Recording . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Transferring Recorded Data to PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

CHAPTER 3

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Wiring of the Junction Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

VAISALA________________________________________________________________________ 1

________________________________________________________________________________

CHAPTER 4

OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Connecting GMP343 to PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Connection Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Installing the Driver for the USB Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Opening a Terminal Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Operation modes of the GMP343 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Getting the Measurement Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Measurement Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Starting the Continuous Outputting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Stopping the Continuous Outputting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Setting the Continuous Outputting Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Outputting the Reading Once . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Setting the Serial Interface Measurement Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Setting Communication Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Serial Communication Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Formatting the Measurement Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Formatting the Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Setting Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Networking Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Setting the Transmitter Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Open and Close . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Setting Echoing Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Preparation for Network Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Commands during Network Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Measurement Range, Data Filtering and Linearization . . . . . . . . . . . . . . . . . . . . . . . 40

Setting the Measurement Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Measurement Data Filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Median Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Averaging Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Smoothing Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

How the Filtering Affects the Response Time . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Setting the Median Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Setting the Averaging Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Setting the Smoothing Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Flushing the Filters (Resynchronization) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Linearization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Setting the Linearization ON/OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Temperature, Pressure, Relative Humidity, and Oxygen Compensations . . . . . . . . 45

Temperature Compensation ON/OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Setting the Oxygen Concentration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Setting Oxygen When the Device Is in POLL-mode. . . . . . . . . . . . . . . . . . . . . . . 48

Oxygen Compensation Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Setting the Ambient Pressure (hPa) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

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

Pressure Compensation ON/OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Setting Ambient Relative Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

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

Relative Humidity Compensation ON/OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

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

Analog Output Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

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

Setting the High Limit of the Voltage Output Range . . . . . . . . . . . . . . . . . . . . . . . . . . 53

2 _______________________________________________________________________________

________________________________________________________________________________

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

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

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

Testing the Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

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

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

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

Setting the Optics Heating ON/OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Resetting the Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

CHAPTER 5

CALIBRATION AND ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Calibration Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Factory Calibration and Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Calibration and Adjustment by the User . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Calibration (Checking) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Checking the Compensations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Measurements in Reference Gases. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Adjustment in 1...2 Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Adjustment in 3...8 Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Example of the 2-Point Adjustment Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . 65

CHAPTER 6

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Cleaning the Probe Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Changing the Filter and Cleaning the Optics (Diffusion Model Only) . . . . . . . . . . . 70

Error States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72

Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Product Returns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

CHAPTER 7

TECHNICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Effects of Temperature, Pressure, Relative Humidity, and Oxygen . . . . . . . . . . . . 76

Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Oxygen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Response time (90 %) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

VAISALA________________________________________________________________________ 3

________________________________________________________________________________

Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Spare Parts and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

APPENDIX A

DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

GMP343 (Flow-through) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

GMP343 (Diffusion) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Calibration Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Mounting Flange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Junction Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Mounting Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

APPENDIX B

LIST OF COMMANDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Measurement Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Filtering Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

P, T and RH Compensation Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Device Handling Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Device Information Display Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Calibration Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Setting and Testing the Analog Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

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

4 _______________________________________________________________________________

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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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

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

Figure 5 Structure of the MI70 Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 6 Keyboard of MI70 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 7 Mounting GMP343 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 8 Entering Measurement Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Figure 9 The Difference of the Two Filters in Time Response . . . . . . . . . . . . . . . . . 43

Figure 10 Opening the Diffusion Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Figure 11 Optics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Figure 12 GMP343 Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

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6 _______________________________________________________________________________

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List of Tables

Table 1 Manual Revisions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Table 2 Wiring Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Table 3 Communication Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Table 4 Quantities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Table 5 Modifiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Table 6 Averaging Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Table 7 Troubleshooting Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Table 8 Effect of Temperature on Accuracy with Temperature Compensation . . . . 76

Table 9 Effect of Pressure on Accuracy with Pressure Compensation . . . . . . . . . . 76

Table 10 Diffusion Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Table 11 Flow-through Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Table 12 List of Spare Parts and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

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8 _______________________________________________________________________________

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.

Contents of This Manual

- Chapter 1, General Information: This chapter provides general notes
for the manual and the product.

- Chapter 2, Product Overview: This chapter introduces the features of
the GMP343.

- Chapter 3, Installation: This chapter provides you with information
that is intended to help you install this product.

- Chapter 4, Operation: This chapter contains information that is
needed to operate the GMP343.

- Chapter 5, Calibration and Adjustment: This chapter contains
information for performing the calibration and adjustment of the
GMP343.

- Chapter 6, Maintenance: This chapter instructs in the basic
maintenance of the GMP343.

- Chapter 7, Technical Data: This chapter provides the technical data of
the GMP343.

- Appendix A, Dimensions: This appendix contains the dimension
drawings for the GMP343.

- Appendix B, List of Commands: This appendix lists the serial
commands of the GMP343.

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User’s Guide ______________________________________________________________________

Version Information

Table 1 Manual Revisions

Manual Code Description

M210514EN-E November 2013. This manual. Updated probe

cleaning instructions.

M210514EN-D June 2013. Previous version. Updated

temperature dependence specification.
Updated Technical Support contact information
and warranty information.

Documentation Conventions

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.

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.

10 ___________________________________________________________________M210514EN-E

Chapter 1 ________________________________________________________ General Information

Recycle all applicable material.

Dispose of batteries and the unit according to statutory regulations.
Do not dispose of with regular household refuse.

Recycling

Trademarks

CARBOCAP® is a registered trademark of Vaisala Oyj.

Regulatory Compliances

Vaisala CARBOCAP® Carbon Dioxide Probe GMP343 is in compliance
with the following EU directive, including the latest amendments, and with
national legislation implementing this directive:

- EMC-Directive

Conformity is shown by compliance with the following standards:

- EN 61326-1: Electrical equipment for measurement, control, and
laboratory use - EMC requirements - Generic Environment.

- CISPR16/22 class B, EN 61000-4-2, EN 61000-4-3, EN 61000-4-4,
EN 61000-4-5, EN 61000-4-6.

Warranty

Visit our Internet pages for more information and our standard warranty
terms and conditions: www.vaisala.com/warranty.

Please observe that any such warranty may not be valid in case of damage
due to normal wear and tear, exceptional operating conditions, negligent
handling or installation, or unauthorized modifications. Please see the
applicable supply contract or Conditions of Sale for details of the warranty
for each product.

VAISALA_______________________________________________________________________ 11

User’s Guide ______________________________________________________________________

12 ___________________________________________________________________M210514EN-E

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 RS-232/RS-485

communication is available. The measuring range options vary from 0 ...
1000 ppm to 0 ... 2 %CO

Each GMP343 is calibrated using ±0.5 % accurate gases at 0 ppm,
200 ppm, 370 ppm, 600 ppm, 1000 ppm, 4000 ppm and 2 %. Calibration
is also done at temperature points of -30 °C, 0 °C, 25 °C and 50 °C. If
needed, the customer can recalibrate the instrument using the multipoint
calibration (MPC) feature allowing up to 8 user-defined calibration points.

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 80.

.

2

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User’s Guide ______________________________________________________________________

GMP343 Transmitter Components

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)

NOTE

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

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.

14 ___________________________________________________________________M210514EN-E

Chapter 2 __________________________________________________________ Product Overview

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 40 and Temperature,

Pressure, Relative Humidity, and Oxygen Compensations on page 45.

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 CO

gas and a reference band.

2

Figure 2 Principle of Operation

When the passband of the FPI coincides with the absorption wavelength of
the CO

gas, the IR detector sees a decrease in the light transmission. The

2

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 43).

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User’s Guide ______________________________________________________________________

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

60.

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.

In order to have a quick measurement with very short response time the
filter can be removed; see section Response time (90 %) on page 77. 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 Changing the Filter and Cleaning the Optics (Diffusion Model

Only) on page 70. 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

Response time (90 %) on page 77 (flow dependence). The volume of the

internal measurement chamber is 59 ml ± 1 ml.

The gas sample must not include acidic gases.

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Chapter 2 __________________________________________________________ Product Overview

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 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

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User’s Guide ______________________________________________________________________

Optional Accessories

Various adapter and filter options are available for the GMP343. For a
complete list, see section Spare Parts and Accessories on page 80.

Figure 4 Examples of Optional Accessories

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 the GMP343 is powered via MI70.

The following accessories are included when the MI70 indicator is ordered
with the GMP343:

- Rechargeable battery pack.

- AC recharger with Euro, UK, US, and AUS adapters.

- MI70Link software with RS-232 cable (PC <–> MI70).

- 2 m interface cable (GMP343 <–> MI70).

Recharging the Battery Pack

The rechargeable battery pack is located behind the back plate of the
indicator. Recharge the battery pack as follows:

18 ___________________________________________________________________M210514EN-E

Chapter 2 __________________________________________________________ Product Overview

1. 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.

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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User’s Guide ______________________________________________________________________

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 Figure 6 on page 20:
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.

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.

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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. The default
settings are: 1013 hPa, 50 %RH, and 20.9 %O2.

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.

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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 on page 80.
You can examine the recorded data easily in Windows and transfer it

further to a spreadsheet program (such as Microsoft® Excel) for
modification.

More information on the data transfer and software features is found in the
online help of the MI70 Link program.

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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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User’s Guide ______________________________________________________________________

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 on page 80.

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

page 27.

WARNING

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

Table 2 Wiring Pins

Pin Wire Serial signal (RS-232 or 2-

Wire RS-485 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...36 V DC
7 Blue RS232C: RX RS485: B(-) ­8 Shield - - Signal GND

24 ___________________________________________________________________M210514EN-E

Analog signal

Chapter 3 _______________________________________________________________ Installation

There are two pins per signal internally hardwired in parallel (pins 1 and 2,
pins 3 and 7). You should connect the RS-232C signal 'TX' (or 2-Wire RS­485 signal 'A') either to the pin 1 or 2 and the RS-232C signal 'RX' (or 2­Wire RS-485 signal 'B') either to the pin 3 or 7.

Note that there is either an RS-232 or a 2-wire RS-485 communication
interface available according to initial configuration. However, if the
device is configured in RS-485 output mode, the device can still be
switched into RS-232 mode by re-configuration via PC. For more
information on serial commands and RS-232/485 modes, see Chapter 4,

Operation, on page 27.

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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26 ___________________________________________________________________M210514EN-E

Chapter 4 ________________________________________________________________ Operation

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.

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 latest
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.

VAISALA_______________________________________________________________________ 27