Teledyne 311TC Instruction Manual
Trace Oxygen Analyzer Model 31 1TC
INSTRUCTION MANUAL
MODEL 311TC
TRACE OXYGEN ANALYZER
DANGER
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 M37928
03/06/00
ECO # 00-0060
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Trace Oxygen Analyzer Model 31 1TC
Copyright © 1999 Teledyne Analytical Instruments
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.
Warranty
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 shipment, except in cases where quotations or
acknowledgments 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, neglect or repairs other than those performed by Teledyne or an
authorized service center. 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 Notice
This instrument provides measurement readings to its user, and serves as a tool by
which valuable data can be gathered. The information provided by the instrument may
assist the user in eliminating potential hazards caused by his process; however, it is
essential that 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 instrumentation 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 it can be misused. In
particular, any alarm or control systems installed must be tested and understood, both as
to how they operate and as to how they can be defeated. Any safeguards required such
as locks, labels, or redundancy, must be provided by the user or specifically requested of
Teledyne at the time the order is placed.
Therefore, the purchaser must be aware of the hazardous process conditions.
The purchaser is responsible for the training of 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.
Teledyne Analytical Instruments (TAI), the manufacturer of this instrument,
cannot accept responsibility for conditions beyond its knowledge and control. No
statement expressed or implied by this document or any information disseminated by the
manufacturer or its agents, is to be construed as a warranty of adequate safety control
under the user’s process conditions.
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Trace Oxygen Analyzer Model 31 1TC
RFI Immunity
The Teledyne Model 311TC has been tested to the standard required by the
European Community for CE marking, EN 60601-1-2.
The sample subjected to testing passed all sections of this testing with the
exception of the following:
From 150KHz to 16MHz no problems were observed. From
16MHz to 80MHz the meter needle deflected to full scale and then
dropped to zero. The equipment under test required a power cycle
to fully reset.
The power cord is used for battery recharging purposes only and
requires a power cycle in normal operation. Therefore, no failure
occurred with respect to EN 50082-2 performance criteria.
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Trace Oxygen Analyzer Model 31 1TC
T able of Contents
1 Introduction
1.1 Description...................................................................1-1
1.2 Method of Analysis ......................................................1-1
1.3 Outstanding Features .................................................. 1-2
2 Installation
2.1 Sampling Equipment....................................................2-1
2.2 Power Service..............................................................2-1
3 Operation
3.1 Introduction..................................................................3-1
3.2 Positive Pressure Sampling.........................................3-2
3.3 Atmospheric Pressure Sampling..................................3-2
3.4 Calibration ...................................................................3-3
3.4.1 Calibration Procedure Using Calibration Gas . .3 - 3
3.4.2 Calibration Procedure Using Air ....................3 -4
4 Maintenance
4.1 Battery Power Supply Service .....................................4-1
4.2 Routine Maintenance...................................................4 -2
4.3 Micro Fuel Cell .............................................................4-2
4.4 Cell Replacement ........................................................ 4-2
4.5 Transduction and Temperature Compensation............4-4
4.6 Leak Testing ................................................................4-4
Procedure 1. .............................................................4-4
Procedure 2. .............................................................4-5
Appendix
Specifications......................................................................A-1
Recommended Spare Parts List for Model 311TC..............A-2
Drawing List ........................................................................A-2
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T race Oxygen Analyzer Introduction 1
Introduction
1.1 Description
The Teledyne Analytical Instruments (TAI) Model 311TC is a portable, intrinsically safe trace oxygen analyzer which can be operated without
an external power source and reliably calibrated without the use of cumbersome, questionable, so-called “certified” calibration gases.
The instrument provides for trace oxygen analysis in decade steps
ranging from 0-10 to 1-10,000 ppm (full scale) plus a special calibration
range that encompasses the known oxygen concentration of atmospheric air
(209,000 ppm).
Sample oxygen is read from an extremely accurate integral meter
(0.5% linearity) whose range of measurement is determined by the position
of the range selector switch. The 100 division meter scale and the multiplying factor indicated by the position of the range switch determine the full
scale oxygen sensitivity of the instrument. The linear 4.5 inch scale (mirror
equipped to eliminate parallax) provides excellent resolution and accuracy.
Sample gas is introduced and vented via a pair of quick disconnect
fittings that feature integral shutoff valves which automatically close when
the mating male fitting is withdrawn. The fittings are an integral part of the
measuring cell manifold so that internal sample passage volume is at an
absolute minimum. Sample flow control, although not critical (0.1 to 10
liters/min.), must be accomplished with accessory equipment.
1.2 Method of Analysis
The sample oxygen is measured by a unique electrochemical transducer
which functions as a fuel cell; in this instance, the fuel is oxygen. Oxygen
diffusing into the cell reacts chemically to produce an electrical current that
is proportional to the oxygen concentration in the gas phase immediately
adjacent to the transducers sensing surface. The linear, but minute, signal
produced by the transducer from trace oxygen is amplified by a two stage
amplifier. The dual stages of amplification provide enough gain to drive the
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0-100 microampere meter and thermistor controlled network utilized to
compensate for the positive temperature coefficient of the transducer.
1.3 Outstanding Features
The following unique features are incorporated into the Model
311TC:
• Micro-Fuel Cell
The Micro-fuel Cell (U.S. Pat. Nos. 3,767,552 and 3,668,101) is
a sealed electrochemical transducer with no electrolyte to change
or electrodes to clean. When the cell reaches the end of its
useful life, it is merely thrown away and replaced, as one would
replace a worn out battery in a flashlight. The life of the cell is
warranted by TAI (see Section 4.4) in a fashion similar to that
employed by the manufacturers of automobile batteries. This
procedure guarantees the customer compensation for failure of a
given cell to perform as specified.
• Reliable Calibration
The unique qualities of the Micro-fuel Cell allows the user to
calibrate the instrument with the most economical, reliable,
abundant, standardization gas there is — atmospheric air.
The special “CAL” range of the instrument features a mark that
coincides with the 209,000 ppm oxygen concentration of air. By
drawing air through the instrument (see the sample calibration
procedure in Section 3.2) reliable calibration can be achieved.
The electronics have been properly zeroed (a onetime factory
operation), so that the instrument does not produce an output
indication in the absence of oxygen. Refer to Section 3.2 if
readjustment is required.
• Integral Power Supply
The differential power requirement (plus and minus 3.6 volts
D.C.) of the instrument amplifier is furnished by two internally
mounted 750 milliampere hour nickel cadmium batteries. Fully
charged, these batteries will provide enough power to operate
the instrument continuously for a period of about thirty-five (35)
days. Furthermore, an overnight charge on a one-month duty
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T race Oxygen Analyzer Introduction 1
cycle should keep the original batteries supplied usable for many
years.
An integral charging circuit and a detectable power cord are
provided so that the batteries may be recharged from any 50 or
60 cycle, 220/240V (or with option, 105 to 125V) convenience
outlet.
The instrument is designed to either sample or have its batteries
recharged. Both operations cannot be carried out
simultaneously. TAI has deliberately interlocked the circuitry so
that both operations cannot be carried on at the same time.
Only when the selector switch is placed in the OFF position will
the neon lamp on the back plate of the Model 311TC light up to
indicate power to the battery charging circuit.
A current limiting resistor is potted into the end of each battery.
This assures that under no circumstances can more than 25
milliamperes (100 milliwatts) be switched or drawn from either
battery supply. This means that the Model 311TC may be used
in explosive atmospheres where arcs of 100 milliwatts or less
can be tolerated. The Model 311TC meets CENELEC approval
requirements as intrinsically safe for Group IIC Temperature
Class T4, hazardous locations as approved by BASEEFA
EX86B2228.
CAUTION: This safety feature does not apply when the instrument is being
charged (AC power cord connected and selector switch in the
“OFF” position). The instrument should not be used in explosive atmospheres when the batteries are being charged.
To determine the state of the rechargeable batteries, turn the
range selector knob counterclockwise to the battery test position
and hold there. The knob is a spring loaded switch. Observe that
the meter indicator stays within the battery limits. If it does not,
then recharge or replace the batteries. Release the Range
Selector Switch, it will automatically return to the OFF position.
• Accuracy and Response
The Model 311TC provides monitoring accuracies of ±2% of
full scale or ±1 ppm, whichever is greater, at constant
temperature. A ±5% of full scale accuracy is achievable
throughout the operating temperature range of 0 to 50 deg C.
With a sample flowrate of 150 cc/min. 90% response is achieved
in 10 seconds in the X10, X100, X1000, and CAL range switch
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T race Oxygen Analyzer Introduction 1
positions. When in the X1 (0-10 ppm) range, 90% response is
realized in 60 seconds.
• Compact Packaging
The instrument is housed in 6-1/8 X 9-1/2 X 5-5/8 in aluminum
case that is equipped with a carrying handle and foot pads.
When in use, the analyzer should be placed in an upright position
on a level surface (off level positioning will detract from meter
accuracy).
Access to the instrument interior is gained by loosening (ccw)
1
the three (3)
the outer case. The case may then be detached from the control
panel assembly. Further disassembly may be accomplished by
removing the back plate assembly from its four (4) mounting
standoffs and laying the two separated assemblies out as
illustrated on the analyzer wiring diagram. The diagram is
included among the drawings at the rear of the manual.
/4 turn screw driver type fasteners on the back of
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