Oldham TCOD-IR Operating Instructions Manual

FOR THE MEASUREMENT OF CARBON DIOXIDE (CO2)

Ref : D 813 575
Code : 98 MU TCOD-IR GB03

OLDHAM S.A.

Plant and Head Office

Zone Industrielle Est – Rue Orfila - B. P. 417 - 62027 ARRAS Cedex - FRANCE

Tél : [phone]. – Fax : [phone].

Email : [e-mail] www.oldham.fr

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OOLLDDHHAAMM SS..AA.

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GAS DETECTION

GAS and DUST

EMISSION ANALYSIS

We are delighted that you have chosen an OLDHAM S.A. instrument and would like to thank you for
your choice.

We have taken all the necessary measures to ensure that your instrument provides total
satisfaction in the future.

Now it is important to read this document carefully.

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* OLDHAM S.A. declines its responsibility towards any person for material damage, physical injury or death

resulting wholly or partly from inappropriate use, installation or storage of its equipment resulting from failure
to observe instructions and warnings and/or standards and regulations in force.

* OLDHAM S.A. neither supports nor authorises any company, physical or moral person to assume

responsibility on behalf of OLDHAM S.A., even if it is involved in the sale of OLDHAM S.A. products.

* OLDHAM S.A. cannot be held responsible for direct or indirect damage or be required to pay direct or

indirect compensation resulting from the sale or use of any of its products IF THESE PRODUCTS HAVE

NOT BEEN DEFINED AND CHOSEN BY OLDHAM S.A. FOR THEIR SPECIFIC USE.

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* Drawings, plans, specifications and information included in this document contain confidential information

that is the property of OLDHAM S.A.

* None of this information may be reproduced, copied, divulged or translated, by physical, electronic or any

other means, nor used as the basis for the manufacture or sale of OLDHAM S.A. equipment or for any other
reasons without prior consent from OLDHAM S.A.

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* This document is not contractually binding. In the interests of its customers, OLDHAM S.A. reserves to

modify the technical specifications of its equipment without notice, in order to improve its performance.

* READ THIS MANUAL CAREFULLY BEFORE FIRST USE OF THE EQUIPMENT: this manual must be read

by any person who is or will be responsible for using, maintaining or repairing this equipment.

* This equipment will only provide the announced performance levels if it is used, maintained and

repaired according to OLDHAM S.A. directives, by OLDHAM personnel or by personnel approved
by OLDHAM S.A.

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I. APPLICATION ______________________________________________________ 7

II. APPROVAL________________________________________________________ 7

III. PRINCIPAL OF OPERATION OF THE SENSOR __________________________ 7

IV. OPERATING ENVIRONMENT_________________________________________ 7

V. STRUCTURE OF THE TCOD-IR________________________________________ 8

VI. MOUNTING AND INITIAL OPERATION_________________________________ 8

VII. WARM-UP TIME___________________________________________________ 8

VIII. CALIBRATION AND ADJUSTMENT __________________________________ 9

IX. TEST GASES_____________________________________________________ 11

X. MAINTENANCE AND CALIBRATION INTERVALS. ______________________ 11

XI. MALFUNCTION STATUS ___________________________________________ 11

XII. ACCESSORIES AND SPARE PARTS_________________________________ 11

XIII. CALIBRATION PROCEDURE_______________________________________ 12

XIV. CALIBRATION CURVES __________________________________________ 13

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The transmitter TCOD-IR are suitable for spot check and continuous measurement of carbon
dioxide concentrations.

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The transmitter, for a 0-3000 ppm, 0-10000 ppm, 0-5% CO2 volume, 0-10 % CO2 volume, 0-50%
CO2 volume measurement ranges, has been approved for the detection of carbon dioxide
concentrations in ambient air corresponding to the German Technical Regulations for the Use of
Drink Dispensers (TRSK 400) and has thus been assessed by an accredited testing institute in
compliance with regulation TRSK 313. The components of the gas detection system are each
approved according to the highest requirements of standards EN50081-2 (generic emission for
household appliances and the light industry) and EN 50082-2 (generic immunity for the industry).

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The sensor element of the TCOD-IR operates by the principle of infrared absorption. This principle
provides :

- precise & accurate measurements

- high selectivity

- poison resistance

The gas to be measured enters the measuring cell via the filter.
An IR source emits light with a large portion in the infrared spectrum through the measuring cell.
CO2 absorbs a certain wavelengh of the light in the IR spectrum. This absorption is converted into
an electric signal. To improve stability, the IR source is clocked. The sensor electronics process
this signal and provide a 4-20 mA output signal from the detector corresponding to gas
concentration.

This output signal is logarithmic with respect to the CO2 concentration.

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For the specification of each transmitter, please see relevant data sheets.
Tests have proven a high resistance of the sensor element against condensation which should be
avoided due to the measuring principle. Consequently, the transmitter should be protected against
warm humid draughts (eg outlets of air conditioning or open windows).