Teledyne 275R User Manual

ODELODEL

ODEL

ODELODEL

OROR

275R 275R

275R

275R 275R

ABLEABLE

ABLE

ABLEABLE

URBINEURBINE

URBINE

URBINEURBINE

URGEURGE

URGE

URGEURGE

NSTRNSTR

NSTR

NSTRNSTR

G G

UCTIONUCTION

UCTION

UCTIONUCTION

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ENERA

ENERAENERA

A A

ASAS

A A

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M M

TT YZERYZER

YZER

YZERYZER

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HIGHLY TOXIC AND OR FLAMMABLE LIQUIDS OR GASES MAY BE PRESENT IN THIS MONITORING SYSTEM. PERSONAL PROTECTIVE EQUIPMENT MAY BE REQUIRED WHEN SERVICING THIS SYSTEM. HAZARDOUS VOLTAGES EXIST ON CERTAIN COMPONENTS INTERNALLY WHICH MAY PERSIST FOR A

TIME EVEN AFTER THE POWER IS TURNED OFF AND DISCONNECTED. ONLY AUTHORIZED PERSONNEL SHOULD CONDUCT MAINTENANCE AND/OR SERVICING. BEFORE

CONDUCTING ANY MAINTENANCE OR SERVICING CONSULT WITH AUTHORIZED SUPERVISOR/MANAGER.

TELEDYNE ANALYTICAL INSTRUMENTS

P/N M51353

03/29/01

ECO # 01-0115

All Rights Reserved. No part of this manual may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any other language or computer language in whole or in part, in any form or by any means, whether it be electronic, mechanical, magnetic, optical, manual, or otherwise, without the prior written consent of Teledyne Analytical Instruments, 16830 Chestnut Street, City of Industry, CA 91749-

1580.

WarrantyWarranty

Warranty

WarrantyWarranty

This equipment is sold subject to the mutual agreement that it is warranted by us free from defects of material and of construction, and that our liability shall be limited to replacing or repairing at our factory (without charge, except for transportation), or at customer plant at our option, any material or construction in which defects become apparent within one year from the date of sale, except in cases where quotations or acknowledgements provide for a shorter period. Components manufactured by others bear the warranty of their manufacturer. This warranty does not cover defects caused by wear, accident, misuse, or neglect. We assume no liability for direct or indirect damages of any kind and the purchaser by the acceptance of the equipment will assume all liability for any damage which may result from its use or misuse.

We reserve the right to employ any suitable material in the manufacture of our apparatus, and to make any alterations in the dimensions, shape or weight of any parts, in

so far as such alterations do not adversely affect our warranty.

Important NoticeImportant Notice

Important Notice

Important NoticeImportant Notice

This instrument is intended to be used a tool to gather valuable data. The information provided by the instrument may assist the user in eliminating potential hazards caused by the process that the instrument is intended to monitor; however,

that all personnel involved in the use of the instrument or its interface with the processthat all personnel involved in the use of the instrument or its interface with the process

that all personnel involved in the use of the instrument or its interface with the process

that all personnel involved in the use of the instrument or its interface with the processthat all personnel involved in the use of the instrument or its interface with the process being measured be properly trained in the process itself, as well as all instrumentationbeing measured be properly trained in the process itself, as well as all instrumentation

being measured be properly trained in the process itself, as well as all instrumentation

being measured be properly trained in the process itself, as well as all instrumentationbeing measured be properly trained in the process itself, as well as all instrumentation related to it.related to it.

related to it.

related to it.related to it.

The safety of personnel is ultimately the responsibility of those who control process conditions. While this instrument may be able to provide early warning of imminent danger, it has no control over process conditions, and can be misused. In particular, any alarm or control system installed must be tested and understood, both as they operate and as they can be defeated. Any safeguards required such as locks, labels, or redundancy must be provided by the user or specifically requested of Teledyne.

The purchaser must be aware of the hazardous conditions inherent in the process(es) he uses. He is responsible for training his personnel, for providing hazard warning methods and instrumentation per the appropriate standards, and for ensuring that hazard warning devices and instrumentation are maintained and operated properly.

TAI, the manufacturer of this instrument, cannot accept responsibility for conditions beyond its knowledge and control.

document or any information disseminated by the manufacturer or his agents is to bedocument or any information disseminated by the manufacturer or his agents is to be

document or any information disseminated by the manufacturer or his agents is to be

document or any information disseminated by the manufacturer or his agents is to bedocument or any information disseminated by the manufacturer or his agents is to be construed as a warranty of adequate safety control under the user's process conditions.construed as a warranty of adequate safety control under the user's process conditions.

construed as a warranty of adequate safety control under the user's process conditions.

construed as a warranty of adequate safety control under the user's process conditions.construed as a warranty of adequate safety control under the user's process conditions.

No statement expressed or implied by thisNo statement expressed or implied by this

No statement expressed or implied by this

No statement expressed or implied by thisNo statement expressed or implied by this

it is essentialit is essential

it is essential

it is essentialit is essential

TELEDYNE ANALYTICAL INSTRUMENTS

Table of ContentsTable of Contents

Table of Contents

Table of ContentsTable of Contents

1.0 INTRODUCTION

1.1 Features .............................................................................. 1.1

2.0 OPERATIONAL THEORY

2.1 Thermal Conductivity .................................................... 2.1

2.2 Electronic Components .................................................... 2.2

3.0 OPERATIONS

3.1 Front Panel.......................................................................... 3.1

3.1.1 Function Switch .................................................... 3.1

3.1.2 Zero Control .................................................... 3.1

3.1.3 Span Control .................................................... 3.1

3.1.4 Cell Temperature .................................................... 3.1

3.1.5 Flowmeter .................................................... 3.1

3.1.6 Analog Meter .................................................... 3.2

3.1.7 Analog Output .................................................... 3.2

3.2 Start-Up ............................................................................... 3.2

3.2.1 Preliminary .................................................... 3.2

3.2.2 Flowrates .................................................... 3.2

3.2.3 Calibration .................................................... 3.2

4.0 INSTALLATION

4.1 Locations............................................................................. 4.1

4.2 Electrical Connections .................................................... 4.1

4.3 Gas Connections .................................................... 4.2

4.3.1 Gases .................................................... 4.2

4.3.2 Vent Lines .................................................... 4.2

4.4 Pressure Regulation .................................................... 4.3

5.0 MAINTENANCE & TROUBLESHOOTING .........................

5.1

6.0 Appendix

Specifications...................................................................... A.1

Calibration Data .................................................................. A.2

Spare Parts List................................................................... A.3

TELEDYNE ANALYTICAL INSTRUMENTS

Drawing List ........................................................................ A.4

CAUTIONCAUTION

CAUTION

CAUTIONCAUTION

• Do not connect the instrument to a pressure source greater than

30 psig30 psig

30 psig.

30 psig30 psig

• This is a measurement instrument,

• This instrument is

MUST NOTMUST NOT

and

MUST NOT be used in hazardous areas.

MUST NOTMUST NOT

NOTNOT

NOT explosion-proof or intrinsically safe

NOTNOT

NOT a safety instrument.

NOTNOT

TELEDYNE ANALYTICAL INSTRUMENTS

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In order to help you make maintenance purging of turbine generators safer, Teledyne Analytical Instruments has developed the 275R Turbine Generator Purge Gas Analyzer. During maintenance of hydrogen-cooled turbine generators, the cooling gas (H carbon dioxide (CO2) and then air. The 275R accurately measures H concentrations during the replacement process by comparing the difference in thermal conductivities between a sealed reference gas (helium) and the atmosphere undergoing replacement.

) is systematically replaced with

Since air leaks reduce the purity of H2 used in cooling, which increases viscosity and reduces heat conduction, the 275R has a H2-in-air range in order to assist in monitoring H2 and impurity concentrations for optimum efficiency during normal operations.

1.11.1

FeaturesFeatures

1.1

Features

1.11.1

FeaturesFeatures

The Model 275R analyzer has three ranges for purge and normal generator operation, with zero and span potentiometers for each. Each range also has its own scale on the meter face. Efficient insulation around the cell block enables quick restarts so that the instrument can be carried from one generator to the next without a lengthy warm-up period.

Periodic calibration is all the maintenance necessary. Installation is just a matter of connecting sample inlet and outlet lines. The reference cell is sealed; thus, no other gas connections are necessary. Electronic temperature control in the cell block insures optimum accuracy in measurement.

TELEDYNE ANALYTICAL INSTRUMENTS

1.1

1.0 Intr1.0 Intr

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1.2

TELEDYNE ANALYTICAL INSTRUMENTS

Operational Operational

Operational

Operational Operational

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Operational Operational

Operational

Operational Operational

The Model 275R Turbine Generator Purge Gas Analyzer can measure either the concentration of one component in a binary stream of gas, or the purity of a sample stream containing a composite mixture of impurities.

2.12.1

Thermal ConductivityThermal Conductivity

2.1

Thermal Conductivity

2.12.1

Thermal ConductivityThermal Conductivity

The ability of a substance to conduct heat is called

ity

. A good heat conductor has a large thermal conductivity (as in the case of hydrogen and helium, which have nearly identical thermal conductivities); a small thermal conductivity (as in chlorine and carbon dioxide gas) indicates that the substance may be a better insulator than conductor. Operation of the 275R analyzer is based on being able to detect the difference in thermal conductivity between the gas being monitored and the known reference (which, in this case, is helium).

Thermal conductivity measurements are non-specific by nature, which imposes certain limitations and requirements. If the analyzer is to detect a specific component in a sample stream, the sample must be composed of the component of interest and one other gas in order to be accurate.

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thermal conductiv-

If, on the other hand, the user is primarily interested in the purity of a process stream, and does not require specific identification of the impurity, the analyzer can be used on more complex mixtures.

Because analysis by thermal conductivity is not an absolute measurement, standardizing gases of known compositions will be required to zero and span the analyzer.

The detector cell is divided into two halves, with the reference gas (helium) sealed into one chamber, and the other through which the sample flows. The difference in thermal conductivity between the reference gas and the sample is sensed by hot wire elements, which protrude into the chambers. Each pair of elements is wired into an electrical circuit known as a Wheatstone bridge.

TELEDYNE ANALYTICAL INSTRUMENTS

2.1

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