Teledyne 311PC Instruction Manual

Teledyne Analytical Instruments

Percent Oxygen Analyzer Model 311PC

INSTRUCTION MANUAL

MODEL 311PC

PERCENT OXYGEN ANALYZER

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.

DANGER

P/N M61392

03/06/00

ECO # 00-0060

Teledyne Analytical Instruments

Percent Oxygen Analyzer Model

311PC

transcribed, stored in a retrieval system, or translated into any other language or com-

puter language in whole or in part, in any form or by any means, whether it be elec-

tronic, 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 instru-

mentation 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.

Teledyne Analytical Instruments

iii

Percent Oxygen Analyzer Model 311PC

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 Cell Installation .............................................................3-1

3.3 Positive Pressure Sampling.........................................3-2

3.4 Atmospheric Pressure Sampling..................................3-2

3.5 Calibration ...................................................................3-3

3.4.1 Calibration Procedure Using Air ....................3 -3

3.4.2 Calibration Procedure Using Calibration Gas 3- 4

4 Maintenance

4.1 Battery Power Supply Service .....................................4- 1

4.2 Routine Maintenance...................................................4 -2

4.3 Cell Replacement ........................................................ 4-2

4.4 Cell Warranty ............................................................... 4-3

4.5 Transduction and Temperature Compensation............4-3

Appendix

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

Recommended Spare Parts List for Model 311PC.............A-2

Drawing List ........................................................................A-2

Material Safety Data Sheet .................................................A-3

Teledyne Analytical Instruments

Percent Oxygen Analyzer Model

311PC

1–1

Percent Oxygen Analyzer Introduction 1

Teledyne Analytical Instruments

Introduction

1.1 Description

The Teledyneg Analytical Instruments (TAI) Model 311PC is a por-

table, intrinsically safe percent 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 percent oxygen analysis in the ranges

0–25%, 0–10%, 0–5%, 0–2.5% and 0–1% oxygen.

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 0–2.5% range is read on the 0–25% scale

and the 0–1% range is read on the 0–10% scale. 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 signal produced by

the transducer is amplified by a two stage amplifier. The dual stages of

amplification provide enough gain to drive the 0-100 microampere meter

and thermistor controlled network utilized to compensate for the positive

temperature coefficient of the transducer.

1–2

1 Introduction Model 311PC

Teledyne Analytical Instruments

1.3 Outstanding Features

The following unique features are incorporated into the Model

311PC:

• 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 0–25% range should be used for air calibration; the

indicator needle of the meter is brought into coincidence with

the cal mark at 20.9% during air calibration. 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

cycle should keep the original batteries supplied usable for many

years.

1–3

Percent Oxygen Analyzer Introduction 1

Teledyne Analytical Instruments

An integral charging circuit and a detectable power cord are

provided so that the batteries may be recharged from any 50 or

60 cycle, 105 to 125V (or with option, 220/240V) 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 311PC 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 311PC may be used

in explosive atmospheres where arcs of 100 milliwatts or less

can be tolerated. The Model 311PC meets CENELEC approval

requirements as intrinsically safe for Group IIC Temperature

Class T4, hazardous locations as approved by BASEEFA

EX86B2228/3.

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 explo-

sive 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 311PC provides monitoring accuracies of ±2% of

full scale at constant temperature. A ±5% of full scale accuracy

is achievable throughout the operating temperature range of 0 to

50°C.

With a sample flowrate of 1–2 liters/min. 90% response is

achieved in 10 seconds.

1–4

1 Introduction Model 311PC

Teledyne Analytical Instruments

• Compact Packaging

The instrument is housed in 6-

/8 X 9-

/2 X 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)

the three (3)

/4 turn screw driver type fasteners on the back of

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.

• Analysis Ranges

This instrument is equipped with 5 oxygen analysis ranges:

0–25%, 0–10%, 0–5%, 0–2.5% and 0–1% oxygen. The oxygen

concentrations are read from an accurate integral meter with

appropriate scales for the included analysis ranges.

Note: The 0–2.5% range is read on the 0–25% scale and the 0–1% range is

read on the 0–10% scale.

The orange tinted portion of the scale applies only to the 0–25%

range of analysis. It indicates an oxygen rich environment and a

region unsuitable for measurement using this instrument.

Caution: Do not use this instrument for analysis in oxygen rich environ-

ments. This instrument is approved as "intrinsically safe" only

when used in environments containing 21% oxygen or below.

2-1

Teledyne Analytical Instruments

T race Oxygen Analyzer Installation 2

Installation

2.1 Sampling Equipment

The customer must provide a means of controlling the pressure and

flowrate of the sample gas. For positive pressure applications, TAI suggests

a simple throttle valve installed in the sample line between the sample point

and the analyzer. The flowrate should be limited to between 0.1 and 10

liters/min.

For atmospheric pressure sampling, connect a pump and flow control

valve downstream from the analyzer and draw (rather than push) the sample

through the instrument.

TAI supplies three (3) male disconnect fittings with the instrument:

one for installation of the customer’s sample line; one to be used to open the

vent fitting of the instrument; and one (equipped with a plastic tube) for

drawing air through the unit for calibration purposes.

2.2 Power Service

A source of single phase, 105 to 125 volt, 50 or 60 Hz power, capable

of delivering a maximum of ¼ ampere of current will be periodically re-

quired to recharge the instrument’s battery power supply. An internationally

approved 3 wire detachable power cord is provided with the instrument and

should be stored in a safe place when not in use.

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