Teledyne BDS-3000 User Manual

Oxygen Analyzer
OPERATING INSTRUCTIONS FOR
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Oxygen Analyzer
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P/N M71903 11/30/01 ECO # 01-
DANGER
Tox ic g a se s a nd o r fla mma ble liq uids ma y be pr es e nt in this mon itor ing s y stem.
Personal protective equipment may be required when servicing this instrument.
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.
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Before conducting any maintenance or servicing, consult with authorized supervisor/manager.
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Copyright © 2000 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 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, 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
T hi s in str ument p ro v id es measur ement read in g s to it s user, an d serv es as a to o l b y w h i c h v al uabl e d at a can b e g at h er ed . The i n fo rmat i on p r ov id ed by t h e in st r umen t may assi st th e user i n el imi nati n g po ten ti al hazard s cau sed b y his p r ocess; ho wev er , it is essent ial t hat all p er so nn el in v ol ved in th e u se o f t he in st ru men t or it s int er f ace, wi th t h e pr ocess b ein g measu red , be pr op er l y tr ain ed i n t he pr ocess i tself , as well as all in s t r u m e n t a t io n rel at ed to i t .
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, 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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Specific Model Information
The instrument for which this manual was supplied may incorporate one or more options not supplied in the standard instrument. Commonly available options are listed below, with check boxes. Any that are incorporated in the instrument for which this manual is supplied are indicated by a check mark in the box.
Instrument Serial Number: _______________________
Options Included in the Instrument with the Above Serial Number:
BDS 3000-V: Instrument configured for Vacuum Service
19" Rack Mnt: The 19" Relay Rack Mount units are
available with one BDS 3000 series analyzers installed in a standard 19" panel and ready to mount in a standard rack.
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Oxygen Analyzer
Safety Messages
Your safety and the safety of others is very important. We have provided many important safety messages in this manual. Please read these messages carefully.
A safety message alerts you to potential hazards that could hurt you or others. Each safety message is associated with a safety alert symbol. These symbols are found in the manual and inside the instrument. The definition of these symbols is described below:
GENERAL WARNING/CAUTION: Refer to the instructions for details on the specific danger. These cautions warn of specific procedures which if not followed could cause bodily Injury and/or damage the instrument.
CAUTION: HOT SURFACE WARNING: This warning is specific to heated components within the instrument. Failure to heed the warning could result in serious burns to skin and underlying tissue.
WARNING: ELECTRICAL SHOCK HAZARD: Dangerous voltages appear within this instrument. This warning is specific to an electrical hazard existing at or nearby the component or procedure under discussion. Failure to heed this warning could result in injury and/or death from electrocution.
Technician Symbol: All operations marked with this symbol are to be performed by qualified maintenance personnel only.
NOTE: Additional information and comments regarding a specific component or procedure are highlighted in the form of a note.
CAUTION: THE ANALYZER SHOULD ONLY BE USED FOR THE
PURPOSE AND IN THE MANNER DESCRIBED IN THIS MANUAL.
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IF YOU USE THE ANALYZER IN A MANNER OTHER THAN THAT FOR WHICH IT WAS INTENDED, UNPREDICTABLE BEHAVIOR COULD RESULT POSSIBLY ACCOMPANIED WITH HAZARDOUS CONSEQUENCES.
This manual provides information designed to guide you through the installation, calibration and operation of your new analyzer. Please read this manual and keep it available.
Occasionally, some instruments are customized for a particular application or features and/or options added per customer requests. Please check the front of this manual for any additional information in the form of an Addendum which discusses specific information, procedures, cautions and warnings that may be peculiar to your instrument.
Manuals do get lost. Additional manuals can be obtained from Teledyne at the address given in the Appendix. Some of our manuals are available in electronic form via the internet. Please visit our website at: www.teledyne-ai.com.
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Table of Contents
Safety Messages ...........................................................................v
Table of Contents ........................................................................ vii
List of Figures................................................................................ x
List of Tables ............................................................................... xii
Introduction ...................................................................................1
1.1 Overview 1
1.2 Typical Applications 1
1.3 Main Features of the Analyzer 1
1.4 Front Panel (Operator Interface) 2
1.5 Rear Panel (Equipment Interface) 5
Operational Theory .......................................................................7
2.1 Introduction 7
2.2 BDS Sensor 7
2.2.1 Principles of Operation 7
2.2.2 Gas Flow Rate 10
2.2.3 Gas Pressure 11
2.2.4 Temperature effect 11
2.2.5 Recovery from High Level Oxygen Exposure 11
2.2.6 Background gas compatibility 12
2.2.7 Stability 13
2.2.8 Maintenance 13
2.3 Sample System 14
2.4 Electronics and Signal Processing 15
Installation ................................................................................... 19
3.1 Unpacking the Analyzer 19
3.2 Mounting the Analyzer 19
3.3 Rear Panel Connections 21
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3.3.1 Gas Connections 21
3.3.2 Electrical Connections 22
3.3.2.1 Primary Input Power 22
3.3.2.2 50-Pin Equipment Interface Connector 23
3.4 Electrolyte Refill of BDS Sensor 28
3.5 Testing the System 30
3.6 Sensor Protection Mode 30
Operation ..................................................................................... 33
4.1 Introduction 33
4.2 Using Data Entry and Function Buttons 34
4.3 The System Function 36
4.3.1 Tracking Oxygen During Cal and Alarm Delay 37
4.3.2 Setting up an Auto-Cal 38
4.3.3 Password Protection 39
4.3.3.1 Entering the Password 40
4.3.3.2 Installing or Changing the Password 41
4.3.4 Logout 43
4.3.5 System Self-Diagnostic Test 43
4.3.6 Version Screen 44
4.3.7 Filter Function 44
4.3.8 Negative Value Display 45
4.3.9 The Gas Correction Factor 45
4.3.10 Troubleshooting Screen 46
4.3.11 Temperature 47
4.3.12 Extended Analog Output Function 47
4.3.13 Zero Baseline Temperature Compensation 48
4.4 Calibration of the Analyzer 49
4.4.1 Zero Cal 50
4.4.1.1 Auto Mode Zeroing 50
4.4.1.2 Manual Mode Zeroing 51
4.4.2 Span Cal 52
4.4.2.1 Auto Mode Spanning 52
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Oxygen Analyzer
4.4.2.2 Manual Mode Spanning 53
4.4.3 Span Failure 54
4.5 The Alarms Function 54
4.6 The Range Function 57
4.6.1 Setting the Analog Output Ranges 58
4.6.2 Fixed Range Analysis 58
4.7 The Analyze Function 59
4.8 Signal Output 59
Maintenance................................................................................. 65
5.1 Routine Maintenance 65
5.2 Adding Water to the BDS Sensor 65
5.3 Fuse Replacement 66
5.4 System Self Diagnostic Test 67
5.5 Major Internal Components 68
5.6 Cleaning 70
5.7 Troubleshooting 70
Appendix...................................................................................... 73
A-1 Specifications 73
A-2 Recommended 2-Year Spare Parts List 75
A-3 Drawing List 76
A-4 19-inch Relay Rack Panel Mount 76
A-5 Application notes 77
A-6 Material Safety Data Sheet 79
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List of Figures
Figure 1-1: BDS-3000 Front Panel.................................................. 3
Figure 1-2: Model BDS 3000 Rear Panel........................................ 5
Figure 2.1: Cross Section of the BDS Oxygen Sensor................... 9
Figure 2.2: BDS sensor output at different gas flow rate............... 10
Figure 2-3: BDS Sample System .................................................. 11
Figure 2.4 Typical Purge-down Curve After Air Saturation............ 12
Figure 2.5: Adding DI Water to the BDS Sensor .......................... 13
Figure 2-6: Flow Diagram.............................................................. 14
Figure 2-7: Electronic Component Location .................................. 16
Figure 2-8: BDS 3000 Electronics Block Diagram......................... 17
Figure 3-1: Model BDS 3000 Front Panel ..................................... 20
Figure 3-2: Required Front Door Clearance................................. 20
Figure 3-3: Rear Panel of the Model Ultra Trace 3000................. 21
Figure 3-4: Equipment Interface Connector Pin Arrangement ...... 23
Figure 3-5: Remote Probe Connections........................................ 28
Figure 3-6: FET Series Resistance ............................................... 29
Figure 3.7: Adding Electrolyte to the BDS Sensor......................... 29
Figure 4-2: Analyzer Power-up Sequence .................................... 62
Figure 4-3: Analyzer Span Sequence ........................................... 63
Figure 4-4: Analyzer Zero Sequence ............................................ 64
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Figure 5.1 Adding water into the BDS sensor................................ 66
Figure 5-2: Removing Fuse Block from Housing ........................... 67
Figure 5-3: Installing Fuses ........................................................... 67
Figure 5-4: Rear Panel Screws .....................................................69
Figure 5-5: Vacuum Degassing for the BDS Oxygen Sensor........ 71
Figure A-1: Single 19" Rack Mount (dimensions in mm) ............... 76
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List of Tables
Table 3-1: Analog Output Connections ......................................... 24
Table 3-2: Alarm Relay Contact Pins ............................................ 25
Table 3-3: Remote Calibration Connections ................................. 26
Table 3-4: Range ID Relay Connections....................................... 27
Table 4-1: Characters Available for Password Definition: ............ 42
Table 4-2: Linear Output for a 0-100 ppm O2 Range................... 59
Table 4-3: Range ID Output .......................................................... 61
Table 5-1: Self-Test Failure Codes ............................................... 68
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Oxygen Analyzer
DANGER
COMBUSTIBLE GAS USAGE
WARNING
This is a general purpose instrument designed for usage in a nonhazardous area. It is the customer's responsibility to ensure safety especially when combustible gases are being analyzed since the potential of gas leaks always exist.
The customer should ensure that the principles of operating of this equipment is well understood by the user. Misuse of this product in any manner, tampering with its components, or unauthorized substitution of any component may adversely affect the safety of this instrument.
Since the use of this instrument is beyond the control of Teledyne, no responsibility by Teledyne, its affiliates, and agents for damage or injury from misuse or neglect of this equipment is implied or assumed.
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Oxygen Analyzer Introduction
Introduction
1.1 Overview
The Teledyne Analytical Instruments Model BDS 3000 Trace Oxygen Analyzer is a versatile microprocessor-based instrument for detecting oxygen at the parts-per-billion (ppb) level in a variety of gases. This manual covers the Model BDS 3000 General Purpose flush-panel and/or rack-mount units only. These units are for indoor use in a non­hazardous environment.
1.2 Typical Applications
A few typical applications of the Model BDS 3000 are:
Monitoring inert gas blanketing
Air separation and liquefaction
Chemical reaction monitoring
Semiconductor manufacturing
Petrochemical process control
Quality assurance
Gas analysis certification.
1.3 Main Features of the Analyzer
The Model BDS 3000 Oxygen Analyzer is sophisticated yet simple to use. The main features of the analyzer include:
A 2-line alphanumeric vacuum fluorescent display (VFD)
screen, driven by microprocessor electronics. The screen continuously prompts and informs the operator.
High resolution, accurate readings of oxygen content from
low ppb levels through 100 ppm. Large, bright, meter readout.
New BDS Sensing technology, Patent pending.
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Introduction BDS 3000
Versatile analysis over a wide range of applications.
Microprocessor based electronics: 8-bit CMOS
microprocessor with 32 kB RAM and 128 kB ROM.
Three user definable output ranges (from 0-100 ppb through
0-100 ppm) allow best match to users process and equipment, plus a fixed 100 ppm over range.
Auto Ranging allows analyzer to automatically select the
proper preset range for a given measurement. Manual override allows the user to lock onto a specific range of interest.
Two adjustable concentration alarms and a system failure
alarm.
Extensive self-diagnostic testing, at startup and on demand,
with continuous power-supply monitoring.
Two way RFI protection.
RS-232 serial digital port for use with a computer or other
digital communication device.
Four analog outputs: two for measurement (0–1 VDC and
Isolated 4–20 mA DC) and two for range identification.
Convenient and versatile, steel, flush-panel or rack-
mountable case with slide-out electronics drawer.
1.4 Front Panel (Operator Interface)
The standard BDS 3000 is housed in a rugged metal case with all controls and displays accessible from the front panel. See Figure 1-1. The front panel has thirteen buttons for operating the analyzer, a digital meter, an alphanumeric display, and a window for viewing the sample flowmeter.
Function Keys: Six touch-sensitive membrane switches are used to change the specific function performed by the analyzer:
Analyze Perform analysis for oxygen content of a sample gas.
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Oxygen Analyzer Introduction
Figure 1-1: BDS-3000 Front Panel
System Perform system-related tasks (described in detail in chapter 4, Operation.).
Span Span calibrate the analyzer.
Zero Zero calibrate the analyzer.
Alarms Set the alarm setpoints and attributes.
Range Set up the 3 user definable ranges for the instrument.
Data Entry Keys: Six touch-sensitive membrane switches are used to input data to the instrument via the alphanumeric VFD display:
Left & Right Arrows Select between functions currently displayed on the VFD screen.
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Up & Down Arrows Increment or decrement values of functions currently displayed.
Enter Moves VFD display on to the next screen in a series. If none remains,
returns to the
Analyze
screen.
Escape Moves VFD display back to the previous screen in a series. If none
remains, returns to the
Analyze
screen.
Digital Meter Display: The meter display is a Light Emitting Diode (LED) device that produces large, bright, 7-segment numbers that are legible in any lighting. It produces a continuous readout from 0-999.9 ppb and then switches to a continuous ppm readout from 0-100.00 ppm. It is accurate across all analysis ranges without the discontinuity inherent in analog range switching.
Alphanumeric Interface Screen: The VFD screen is an easy-to-use interface from operator to analyzer. It displays values, options, and messages that give the operator immediate feedback.
Flowmeter: Monitors the flow of gas past the sensor. Readout is 0.1 to
2.0 standard liters per minute (SLPM) of nitrogen Standby Button: The Standby turns off the display and outputs, but
circuitry is still operating.
CAUTION: THE POWER CABLE MUST BE UNPLUGGED TO
FULLY DISCONNECT POWER FROM THE INSTRUMENT. WHEN CHASSIS IS EXPOSED OR WHEN ACCESS DOOR IS OPEN AND POWER CABLE IS CONNECTED, USE EXTRA CARE TO AVOID CONTACT WITH LIVE ELECTRICAL CIRCUITS.
Access Door: For access t o the BDS S ensor , the front panel swi ngs open when the l at ch in t he upper r ight corner of t he panel i s pressed al l the way i n wi th a nar row gauge t ool . Accessi ng the mai n cir cuit boar d requir es unf astening rear panel screws and sl i di ng t he uni t out of the case.
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Oxygen Analyzer Introduction
1.5 Rear Panel (Equipment Interface)
The rear panel, shown in Figure 1-2, contains the gas and electrical connectors for external inlets and outlets. Some of those depicted are optional and may not appear on your instrument. The connectors are described briefly here and in detail in Chapter 3 Installation.
Figure 1-2: Model BDS 3000 Rear Panel
Power Connection Universal AC power source.
Gas Inlet and Outlet One inlet and one exhaust out.
Analog Outputs 0–1 VDC oxygen concentration plus 0-1 VDC range ID, and isolated 4–20 mA DC oxygen concentration plus 4-20 mA DC range ID.
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Introduction BDS 3000
Alarm Connections 2 concentration alarms and 1 system alarm.
RS-232 Port Serial digital concentration signal output and control input.
Remote Probe Used in the BDS 3000 for controlling external solenoid valves only.
Remote Span/Zero Digital inputs allow external control of analyzer calibration.
Calibration Contact To notify external equipment that instrument is being calibrated and readings are not monitoring sample.
Range ID Contacts Four separate, dedicated, range relay contacts. Low, Medium, High, Cal.
Network I/O Serial digital communications for local network access. For future expansion. Not implemented at this printing.
Note: If you require highly accurate Auto-Cal timing, use external
Auto-Cal control where possible. The internal clock in the Model BDS 3000 is accurate to 2-3 %. Accordingly, internally scheduled calibrations can vary 2-3 % per day.
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Oxygen Analyzer Operational Theory
Operational Theory
2.1 Introduction
The analyzer is composed of three subsystems:
BDS Sensor
Sample System
Electronic Signal Processing, Display and Control
The sample system is designed to accept the sample gas and transport it through the analyzer without contaminating or altering the sample prior to analysis. The BDS Sensor is an electrochemical device that translates the amount of oxygen present in the sample into an electrical current. The electronic signal processing, display and control subsystem simplifies operation of the analyzer and accurately processes the sampled data. The microprocessor controls all signal processing, input/output and display functions for the analyzer.
2.2 BDS Sensor
2.2.1 Principles of Operation
The BDS oxygen sensor technology developed at Teledyne Analytical Instruments is a result of TAI’s heavy investment on R&D and expertise established during the half-century’s manufacturing of electrochemical oxygen sensor. It stands for Bipotentiostat Driven Sensor. A BDS oxygen sensor accurately translates the oxygen level in the sample gas into to an electrical current signal.
A potentiostat contains three electrodes: a working electrode, a reference electrode and a counter electrode. A Bipotentiostat is a combination of two potentiostats that share the reference electrode and the counter electrode. The potential at the working electrode is precisely controlled with respect to the is used to carry the current that flow through the sensor. A potentiostat is typically constructed with several operational amplifiers. The three electrodes in an electrochemical cell and the operational amplifiers in
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reference electrode. The counter electrode
Operational Theory BDS 3000
the potentiostat constitute a feedback-control loop. The potentiostat technology has been well accepted in the field of electrochemistry, and proven effective in eliminating polarization of the reference electrode and automatic compensating electric resistance in the cell.
In a BDS oxygen sensor, the sensing electrode is a working electrode that is under precise potential control as discussed above. A stable sensing electrode potential is very critical for an oxygen sensor to achieve high stability, low noise and large dynamic range. The reference electrode in a BDS sensor is a Ag/Ag
O electrode which is well known
2
for its stable electrode potential and compatibility with the KOH electrolyte in an oxygen sensor. The counter electrode is made of a Platinum wire.
The sensing process involves electrochemical reactions inside the sensor. At the sensing electrode, oxygen is reduced at the controlled potential:
+ 2H2O + 4e
O
2
-
— > 4OH
-
(1)
There is no net electrochemical reaction at the reference electrode since it is connected to the high impedance input of the operation amplifier.
The electrochemical reaction at the counter electrode is:
4OH- — > O2 + 2H2 O + 4e
-
It is noteworthy that reaction (2) is reverse of the reaction (1). It is indicative of a net change of zero inside a BDS sensor throughout the sensing process. This feature produces a long-term stability for the BDS sensor.
There are two resources of oxygen being reduced at the sensing electrode: from the sample gas and dissolved oxygen within the electrolyte. The oxygen molecules in the sample gas diffuse to the sensing electrode through a diffusion barrier (controlled diffusion) to produce a current signal which is proportional to the oxygen level in the sample gas. However, the dissolved oxygen in the electrolyte also diffuses through the electrolyte. It is reduced at the sensing electrode and produces a background current. This background current represents the detection limit of an oxygen sensor.
The main advantage of the BDS technology lies in the unique second potentiostat. It is designed to remove dissolved oxygen and other
( 2)
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Oxygen Analyzer Operational Theory
impurities in the electrolyte. It eliminates the internal background current which previously limited the detection process.
The second potentiostat is located adjacent to the sensing electrode. It uses a novel material, Reticulated Vitreous Carbon (RVC) and precise control of the potential to remove the dissolved oxygen and impurities in the electrolyte efficiently. As the result, the BDS sensor achieves an outstanding feature of absolute zero output in the absence of oxygen.
Figure 2.1: Cross Section of the BDS Oxygen Sensor
Figure 2.1 shows the schematic of a BDS oxygen sensor. The sample gas enters the sensor through the gas inlet port and exits at the gas outlet. A portion of oxygen in the sample gas diffuses through the diffusion barrier to be reduced at the sensing electrode to form OH- in the electrolyte. OH- can move freely through the porous 2nd working electrode. At the Counter Electrode, OH- is oxidized back to oxygen. While the 2nd working electrode allows OH- to move through, it prevents the dissolved oxygen from the top portion of the sensor to reach
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Operational Theory BDS 3000
the sensing electrode. The reference electrode provides a potential reference for both the sensing electrode and the 2nd working electrode.
NOTE: BDS technology and sensor is a patent pending
technology of Teledyne Analytical Instruments in the United State of America as well as many foreign countries.
To learn more about BDS technology, please visit TAI’s web page at http://www.Teledyne-AI.com
To learn more about potentiostat, visit Electochemical Society’s web page at http://www.electrochem.org
2.2.2 Gas Flow Rate
The output from a BDS oxygen sensor is relatively insensitive to change of gas flow rate if operated in the range of 1 - 3 SCFH (in nitrogen). The output drops when the flow rate is below 1 SCFH. Figure
2.2 is a typical curve showing the sensor outputs at different flow rate.
Figure 2.2: BDS sensor output at different gas flow rate
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Oxygen Analyzer Operational Theory
2.2.3 Gas Pressure
The analyzer is equipped with a flow restriction tube (from the back panel of the analyzer to the left side of the BDS sensor) as shown in Figure 2-3. The sensor is not affected by pressure as long as the analyzer vents to atmosphere. If the analyzer is not vented to atmosphere, the downstream pressure must not exceed 10 inch of water. A clogged or restricted vent or excessive pressure will force gas into the electrolyte and cause damage to the BDS sensor.
Figure 2-3: BDS Sample System
2.2.4 Temperature effect
The raw output from a BDS oxygen sensor has a temperature coefficient about 0.25% / °C. This temperature effect is compensated by the software throughout the operation temperature range (5 – 40°C).
2.2.5 Recovery from High Level Oxygen Exposure
The ambient air contains about 210,000,000 ppb (2.1 x 108) oxygen. Figure 2.4 is a typical purge-down curve for a new BDS sensor which had been air saturated. It is normal to take several hours, even days for an air saturated BDS to purge down to a low ppb level.
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Operational Theory BDS 3000
Figure 2.4 Typical Purge-down Curve After Air Saturation
S h or t e n i ng t h e ai r exp o s u r e wi l l al l o w a f a s t e r se ns o r r ec o v e r y. A ty p i c a l BD S se n s o r wi l l re c o v e r t o 1 pp m i n ap p r ox i m a t el y 25 m i nu t e s , t o 10 0 pp b af t e r 80 m i n , an d 10 pp b i n ab ou t 8 ho u r s , af t e r s u f f e r i n g a t e n m i n u t e ex p os u r e to ai r .
2.2.6 Background gas compatibility
T he BDS oxygen sensor wi l l work in i ner t gas backgr ounds, i ncludi ng ni t rogen, hydr ogen, ar gon, heli um and ethane. The sensor out put, however, i s dif fer ent in di ff erent backgr ound gases. For exam pl e, t he sensor output i n a hydr ogen background is twi ce as much as it woul d be in a ni tr ogen background. Therefor e, i t is recom mended to cali br ate t he analyzer wit h an oxygen standar d that has a sim il ar background as the sam pl e gas. If an oxygen st andar d is unavai l able for a par ti cul ar background, a Gas F act or which is det er mi ned at TAI coul d be used t o cor rect the sensor out put in dif f er ent backgr ound (see sect ion 4.3.9) .
Note: the gas flow meter in the analyzer is calibrated for air. The
error for measuring nitrogen is usually negligible. But for
hydrogen, it reads 100% lower. For example, when the
float ball in the flow meter is at 0.5 SLPM, the actual flow
rate of hydrogen is about 1 SLPM.
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Oxygen Analyzer Operational Theory
The BDS oxygen sensor can tolerate exposure to acidic gases. Up
to 0.2% CO
has no effect to ppb level oxygen measurement.
2
2.2.7 Stability
The BDS sensor is essentially drift free. Typically a BDS sensor requires no re-calibration over an entire year period. However, there may be some intrusion to the zero during the maintenance. See next section for details.
2.2.8 Maintenance
The only maintenance required on the BDS sensor is to replenish distilled or de-ionized water every three to four months. It is not necessary to take the analyzer out of service while adding water to the sensor but caution should be taken to avoid spilling water on the PC boards or other area inside the analyzer.
Figure 2.5: Adding DI Water to the BDS Sensor
There is a Max line and Min Line clearly marked on the BDS sensor body. It is a good practice to check the electrolyte level every month and add de-ionized water into the sensor whenever it is convenient.
When running dry gas through the sensor, the gas carries out moisture from the sensor. Therefore, the electrolyte (10% KOH in
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Operational Theory BDS 3000
water) inside the sensor is gradually concentrated during the sensor operation. It typically takes about four months for the electrolyte level to drop from the Max line to Min line. When adding water to increase the electrolyte level from the Min line to the Max line, it is typical that the oxygen reading will drift down about 10 ppb in an hour. If the oxygen content in the sample gas is very close to zero, the analyzer may display a negative reading during this period. The sensor will recover by itself during the following week. This drift-down then recover-back phenomenon is caused by the quick dilution of the electrolyte and re­establishment of a new equilibrium inside the sensor. To minimize this effect, add a small amount of water each time and do this before the electrolyte level reaches the Min line.
2.3 Sample System
The sample system delivers gases to the BDS sensor from the analyzer rear panel inlet. Depending on the mode of operation either sample or calibration gas is delivered.
The Model BDS 3000 sample system is designed and fabricated to ensure that the oxygen concentration of the gas is not altered as it travels through the sample system.
The sampl e syst em for the standar d inst rument incor porates 1/4" VCR fit tings for sample inl et and swagelock fittings for outl et tube connections at the rear panel. The sample or cal ibrati on gas that flows through the system is monitored by a flowmeter downstream from the sensor .
Figure 2-6 represents the flow diagram of the sampling system. In the standard instrument, calibration gases can be connected directly to the Sample In port by teeing to the port with appropriate valves.
Figure 2-6: Flow Diagram
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Oxygen Analyzer Operational Theory
2.4 Electronics and Signal Processing
T he Model BDS 3000 Oxygen Analyzer uses an 8031 m icrocontr ol l er wi th 32 kB of RAM and 128 kB of ROM to cont rol all signal processi ng, i nput / output, and di splay functi ons f or the analyzer . S ystem power is suppli ed fr om a universal power suppl y module desi gned t o be compat i bl e wi t h any i nt er nat ional power source. F i gure 2- 7 shows t he l ocati on of t he power suppl y and the mai n el ect roni c P C boards.
The signal processing electronics including the microprocessor, analog to digital, and digital to analog converters are located on the motherboard at the bottom of the case. The preamplifier board is mounted on top of the motherboard as shown in the figure. These boards are accessible after removing the back panel. Figure 2-8 is a block diagram of the Analyzer electronics.
In the presence of oxygen the sensor generates a current. A current to voltage amplifier converts this current to a voltage, which is further amplified in the second stage amplifier.
The output from the second stage amplifier is sent to an 18 bit analog to digital converter controlled by the microprocessor.
The digital concentration signal along with input from the control panel is processed by the microprocessor, and appropriate control signals are directed to the display, alarms and communications port. The same digital information is also sent to a 12 bit digital to analog converter that produces the 4-20 mA DC and the 0-1 VDC analog concentration signal outputs, and the analog range ID outputs.
Signals from the power supply are also monitored, and through the microprocessor, the system failure alarm is activated if a malfunction is detected.
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Operational Theory BDS 3000
Figure 2-7: Electronic Component Location
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Oxygen Analyzer Operational Theory
Figure 2-8: BDS 3000 Electronics Block Diagram
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Operational Theory BDS 3000
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Oxygen Analyzer Installation
Installation
Installation of the Model BDS 3000 Analyzer includes:
Unpacking
Mounting
Gas connections
Electrical connections
Filling the Sensor with Electrolyte.
Testing the system.
3.1 Unpacking the Analyzer
Although the analyzer is shipped complete, certain parts, such as the electrolyte, are wrapped separately to be installed on site as part of the installation. Carefully unpack the analyzer and inspect it for damage. Immediately report any damage or shortages to the shipping agent.
3.2 Mounting the Analyzer
The Model BDS 3000 is for indoor use in a general purpose area. It is NOT for hazardous environments of any type.
T he standard model is designed for f l ush panel m ounti ng. F igur e 3-1 i s an i l lust r at ion of the BDS 3000 st andard fr ont panel and mount ing bezel . There ar e four mount ing hol es—one in each corner of t he ri gi d f rame. The dr awings sect i on i n the r ear of thi s manual contai ns out l ine dim ensi ons and mount ing hol e spaci ng di agram s.
On special order, a 19" rack-mounting panel can be provided. For rack mounting, one BDS 3000 series analyzer is flush-panel mounted on the rack panel. See Appendix for dimensions of the mounting panel.
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Installation BDS 3000
Figure 3-1: Model BDS 3000 Front Panel
All operator controls are mounted on the control panel, which is hinged on the left edge and doubles as the door that provides access to the sensor and cell block inside the instrument. The door is spring loaded and will swing open when the button in the center of the latch (upper right corner) is pressed all the way in with a narrow gauge tool (less than 0.18 inch wide), such as a small hex wrench or screwdriver Allow clearance for the door to open in a 90-degree arc of radius 7.125 inches. See Figure 3-2.
Figure 3-2: Required Front Door Clearance
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Oxygen Analyzer Installation
3.3 Rear Panel Connections
Figure 3-3 shows the Model BDS 3000 rear panel. There are ports for gas inlet and outlet, power, communication, and both digital and analog concentration output.
Figure 3-3: Rear Panel of the Model Ultra Trace 3000
3.3.1 Gas Connections
The unit is manufactured with 1/4 inch VCR fittings. For a safe connection:
SAMPLE IN: In the standard model, gas connections are made at the
SAMPLE IN and EXHAUST OUT connections. Calibration gases must be
tee'd into the sample inlet with appropriate valves. A VCR fitting is provided for the inlet connection.
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Installation BDS 3000
The inlet gas pressure should be regulated to pressures between 11 to 16 psig to maintain a flow between 0.5 to 1.0 SLPM. If pressure is too low, the flow will drop below 0.5 SLPM at which the output of the sensor is sensitive (see section 2.2.2). If pressure is too high, it will force gas into the electrolyte and cause damage to the sensor. A pressure regulator must be used if sample pressure varies farther than the recommended range.
If greater sample flow is required for improved response time,
install a bypass in the sampling system upstream of the analyzer input.
EXHAUST OUT: Exhaust connections must be consistent with the hazard level of the constituent gases. Check Local, State, and Federal laws, and ensure that the exhaust stream vents to an appropriately controlled area, if required
3.3.2 Electrical Connections
For safe connections, no uninsulated wiring should be able to come in contact with fingers, tools or clothing during normal operation.
CAUTION: USE SHIELDED CABLES. ALSO, USE PLUGS THAT
PROVIDE EXCELLENT EMI/RFI PROTECTION. THE PLUG CASE MUST BE CONNECTED TO THE CABLE SHIELD, AND IT MUST BE TIGHTLY FASTENED TO THE ANALYZER WITH ITS FASTENING SCREWS. ULTIMATELY, IT IS THE INSTALLER WHO ENSURES THAT THE CONNECTIONS PROVIDE ADEQUATE EMI/RFI SIELDING.
3.3.2.1 PRIMARY INPUT POWER
The power cord receptacle and fuse block are located in the same assembly. Insert the power cord into the power cord receptacle.
CAUTION: POWER IS APPLIED TO THE INSTRUMENT'S
CIRCUITRY AS LONG AS THE INSTRUMENT IS CONNECTED TO THE POWER SOURCE. THE RED SWITCH ON THE FRONT PANEL IS FOR SWITCHING POWER ON OR OFF TO THE DISPLAYS AND OUTPUTS ONLY.
The universal power supply requires 85–250 VAC, 47-63 Hz power source.
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Oxygen Analyzer Installation
Fuse Installation: The fuse block, at the right of the power cord receptacle, accepts US or European size fuses. A jumper replaces the fuse in whichever fuse receptacle is not used. Fuses are not installed at the factory. Be sure to install the proper fuse as part of installation. (See Fuse Replacement in chapter 5, maintenance.)
3.3.2.2 50-PIN EQUIPMENT INTERFACE CONNECTOR
Figure 3-4 shows the pin layout of the Equipment Interface connector. The arrangement is shown as seen when the viewer faces the rear panel of the analyzer. The pin numbers for each input/output function are given where each function is described in the paragraphs below.
Figure 3-4: Equipment Interface Connector Pin Arrangement
Analog Outputs: There are four DC output signal pins—two pins per output. For polarity, see Table 3-1. The outputs are:
0–1 VDC % of Range: Voltage rises linearly with increasing
oxygen, from 0 V at 0 ppm to 1 V at full scale ppm. (Full scale = 100% of programmable range.)
0–1 VDC Range ID: 0.25 V = Low Range, 0.5 V = Medium
Range, 0.75 V = High Range, 1 V = 100ppm.
4–20 mA DC % Range: Current increases linearly with
increasing oxygen, from 4 mA at 0 ppm to 20 mA at full scale ppm. (Full scale = 100% of programmable range.)
4–20 mA dc Range ID: 8 mA = Low Range, 12 mA = Medium
Range, 16 mA = High Range, 20 mA = 100ppm.
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Installation BDS 3000
Table 3-1: Analog Output Connections
Pin Function
3+ Range ID, 4-20 mA, floating 4– Range ID, 4-20 mA, floating 5+ % Range, 4-20 mA, floating 6– % Range, 4-20 mA, floating 8+ Range ID, 0-1 V dc 23 – Range ID, 0-1 V dc, negative ground 24 + % Range, 0-1 V dc 7– % Range, 0-1 V dc, negative ground
Alarm Relays: The nine alarm-circuit connector pins connect to the internal alarm relay contacts. Each set of three pins provides one set of Form C relay contacts. Each relay has both normally open and normally closed contact connections. The contact connections are shown in Table 3-2. They are capable of switching up to 3 amperes at 250 VAC into a resistive load. The connectors are:
Threshold Alarm 1:
Can be configured as high (actuates when concentration
is above threshold), or low (actuates when concentration is below threshold).
Can be configured as failsafe or nonfailsafe.
Can be configured as latching or nonlatching.
Can be configured out (defeated).
Threshold Alarm 2:
Can be configured as high (actuates when concentration
is above threshold), or low (actuates when concentration is below threshold).
Can be configured as failsafe or nonfailsafe.
Can be configured as latching or nonlatching.
Can be configured out (defeated).
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Oxygen Analyzer Installation
System Alarm:
Actuates when DC power supplied to circuits is unacceptable in one or more parameters. Permanently configured as failsafe and latching. Cannot be defeated. Actuates if self-test fails.
(Reset by pressing button to remove power. Then press again and any other button EXCEPT System to resume.
Further detail can be found in Chapter 4, Section 4-5.
Table 3-2: Alarm Relay Contact Pins
Pin Contact
45 Threshold Alarm 1, normally closed contact 28 Threshold Alarm 1, moving contact 46 Threshold Alarm 1, normally open contact 42 Threshold Alarm 2, normally closed contact 44 Threshold Alarm 2, moving contact 43 Threshold Alarm 2, normally open contact 36 System Alarm, normally closed contact 20 System Alarm, moving contact 37 System Alarm, normally open contact
Digital Remote Cal Inputs: Accept 0 V (off) or 24 V dc (on) inputs for remote control of calibration. (See Remote Calibration Protocol below.) See Table 3-3 for pin connections.
Zero:
Floating input. 5 to 24 V i nput across the + and – pins puts the analyzer into the Zero mode. Either side may be grounded at the source of t he signal. 0 to 1 volt across the ter minals allows Zero mode to ter minate when done. A synchronous signal must open and close the external zero val ve appropriately. See Remote P robe Connect or. (T he –C opt ion internal valves oper ate automati cally) .
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Installation BDS 3000
Span:
Floating input. 5 to 24 V input across the + and – pins puts the analyzer into the Span mode. Either side may be grounded at the source of the signal. 0 to 1 volt across the terminals allows Span mode to terminate when done. A synchronous signal must open and close external span valve appropriately. See Figure 3-5 Remote Probe Connector. (The –C option internal valves operate automatically.)
Cal Contact:
This relay contact is closed while analyzer is spanning and/or zeroing. (See Remote Calibration Protocol below.)
Table 3-3: Remote Calibration Connections
Pin Function
9+ Remote Zero 11 – Remote Zero 10 + Remote Span 12 – Remote Span 40 Cal Contact 41 Cal Contact
Remote Calibration Protocol: To properly time the Digital Remote Cal Inputs to the Model BDS 3000 Analyzer, the customer's controller must monitor the Cal Relay Contact.
When the contact is OPEN, the analyzer is analyzing, the Remote
Cal Inputs are being polled, and a zero or span command can be sent.
When the contact is CLOSED, the analyzer is already calibrating. It will ignore your request to calibrate, and it will not remember that request.
Once a zero or span command is sent, and acknowledged (contact closes), release it. If the command is continued until after the zero or span is complete, the calibration will repeat and the Cal Relay Contact (CRC) will close again.
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Oxygen Analyzer Installation
For example:
1) Test the CRC. When the CRC is open, Send a zero command until the CRC closes (The CRC will quickly close.)
2) When the CRC closes, remove the zero command.
3) When CRC opens again, send a span command until the CRC closes. (The CRC will quickly close.)
4) When the CRC closes, remove the span command.
When CRC opens again, zero and span are done, and the sample is
being analyzed.
Note: The Remote Valve connections (described below) provides
signals to ensure that the zero and span gas valves will be controlled synchronously.
Range ID Relays: Four dedicated Range ID relay contacts. The first three ranges are assigned to relays in ascending order—Low range is assigned to Range 1 ID, Medium range is assigned to Range 2 ID, and High range is assigned to Range 3 ID. The fourth range is reserved for the Air Cal Range (25%). Table 3-4 lists the pin connections.
Table 3-4: Range ID Relay Connections
Pin Function
21 Range 1 ID Contact 38 Range 1 ID Contact 22 Range 2 ID Contact 39 Range 2 ID Contact 19 Range 3 ID Contact 18 Range 3 ID Contact 34 Range 4 ID Contact (Air Cal) 35 Range 4 ID Contact (Air Cal)
Network I/O: A serial digital input/output for local network protocol. At this printing, this port is not yet functional. It is to be used for future options to the instrument. Pins 13 (+) and 29 (–).
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Installation BDS 3000
Remote Valve Connections: The Ultra Trace 3000 is a single-chassis instrument, which has no Remote Valve Unit. Instead, the Remote Valve connections are used as a method for directly controlling external sample/zero/span gas valves. See Figure 3-5.
Figure 3-5: Remote Probe Connections
The voltage from these outputs is nominally 0 V for the OFF and 15 V dc for the ON conditions. The maximum combined current that can be pulled from these output lines is 100 mA. (If two lines are ON at the same time, each must be limited to 50 mA, etc.) If more current and/or a different voltage is required, use a relay, power amplifier, or other matching circuitry to provide the actual driving current.
In addition, each individual line has a series FET with a nominal ON resistance of 5 ohms (9 ohms worst case). This can limit the obtainable voltage, depending on the load impedance applied. See Figure 3-6.
3.4 Electrolyte Refill of BDS Sensor
The BDS sensor was shipped dry. It must be filled with the electrolyte before operation. The electrolyte is a caustic solution (10% KOH), supplied in five 50 ml bottles. Review the Material Safety Data Sheet (MSDS) in Section A-6 before handling the electrolyte.
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Oxygen Analyzer Installation
Figure 3-6: FET Series Resistance
To refill the BDS sensor:
1. Open the front door and swing it open.
2. Unscrew the sensor cap and disconnect sensor cable from the BDS sensor.
3. Pour the electrolyte from the five small bottles into a larger container.
4. Sparge the electrolyte with nitrogen gas at a flow of 100 CCM for about 1/2 hour then pour into the provided wash bottle.
5. Ref. to Figure 3.7 for the method of adding electrolyte to the sensor. It is important that as the sensor is being filled with the electrolyte, filling is accomplished without trapping gas bubbles in the lower part of the sensor.
Figure 3.7: Adding Electrolyte to the BDS Sensor
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Installation BDS 3000
Squirt electrolyte content into the sensor. Do it slowly until the bottom parts of the sensor are fully immersed in the electrolyte.
4. Pour the rest of the electrolyte into the sensor. Gas bubbles in the top portion of the sensor would not affect the sensor performance. One bottle of electrolyte is sufficient to rise the electrolyte level to the MAX line. For the rest of sensor life, no further electrolyte addition is needed.
5. Install the sensor cap,
6. Do not connect the sensor's electric connector at this stage.
3.5 Testing the System
Before plugging the instrument into the power source:
Check the integrity and accuracy of the gas connections.
Make sure there are no leaks.
Check the integrity and accuracy of the electrical
connections. Make sure there are no exposed conductors
Purge the system for 3 minutes. Make sure the gas flow rate
is within 0.5-1 SLPM.
Power up the system, and conduct the Self-Diagnostic Test as described in Chapter 4, Section 4.3.5. It takes two minutes for the microprocessor to test various sections of the analyzer.
3.6 Sensor Protection Mode
The BDS sensor is a very sensitive device for measuring ultra trace levels of oxygen. When the oxygen level in the gas exceeds 100 ppm (in nitrogen background) for one minute, the analyzer will enter a self­protection mode and show temporary shut down on the display. It indicates a high level oxygen intrusion into the system. Check the gas line and other related parts, and fix them if there is any leaks found.
The analyzer will try to reconnect with the sensor in one minute. If it is still over range for one minute, the analyzer will enter a temporary shut down mode again for three minutes. The analyzer will try the third time to reconnect the sensor, and will enter a System Shut Down mode to protect the sensor if it is still over range.
Pressing the ESCAPE key will return the analyzer to operation.
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Oxygen Analyzer Installation
For operations frequently encountering oxygen levels above 100
ppm, TAI’s Micro-Fuel-Cell type of oxygen sensor is recommended.
The maximum working range with a background of nitrogen gas is 100 ppm. The maximum working range is different for other gas backgrounds. See Section 4.3.9.
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Oxygen Analyzer Operation
Operation
4.1 Introduction
Once the analyzer has been installed, it can be configured for your application. To do this you will:
Set system parameters:
Establish a security password, if desired, which will require
the operator to log in.
Establish and start an automatic calibration cycle, if desired.
Calibrate the instrument.
Define the three user-selectable analysis ranges, then choose
autoranging or select a fixed range of analysis, as required.
Set alarm setpoints, and modes of alarm operation (latching,
failsafe, etc).
Before you configure your BDS 3000, these default values are in effect:
Ranges: LO = 100ppb ppm, MED = 1000
ppb, HI = 10 ppm.
Auto Ranging: ON
Alarm Relays: Defeated, Alarm 1 at10.000 ppm,
Alarm 2 at 1.000 ppm HI, Not failsafe, Not latching.
Zero: Auto, every 0 days at 0 hours.
Span: Auto, at 008.00 ppm, every 0 days
at 0 hours.
If you choose not to use password protection, the default password is automatically displayed on the password screen when you start up, and you simply press ENTER for access to all functions of the analyzer.
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Operation BDS 3000
4.2 Using Data Entry and Function Buttons
Data Entry Buttons: The __ arrow buttons select options from the menu currently being displayed on the VFD screen. The selected option
blinks.
When the selected option includes a modifiable item, the __ arrow
buttons can be used to increment or decrement that modifiable item.
The ENTER button is used to accept any new entries on the VFD screen. The ESCAPE button is used to abort any new entries on the VFD screen that are not yet accepted by use of the ENTER button.
Figure 4-1 shows the hierarchy of functions available to the operator via the function buttons. The six function buttons on the analyzer are:
Analyze. This is the normal operating mode. The analyzer
monitors the oxygen content of the sample, displays the percent of oxygen, and warns of any alarm conditions.
System. The system function consists of several subfunctions
that regulate the internal operations of the analyzer:
Auto-Cal setup
Password assignment
Self -Test initiation
Checking software version
Logging out
Show negative readings
Set digital filter
Zero. Used to set up a zero calibration.
Span. Used to set up a span calibration.
Alarms. Used to set the alarm setpoints and determine
whether each alarm will be active or defeated, HI or LO acting, latching, and/or failsafe.
Range. Used to set up three analysis ranges that can be
switched automatically with auto-ranging or used as individual fixed ranges.
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Oxygen Analyzer Operation
Figure 4-1: Hierarchy of Functions and Subfunctions
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Operation BDS 3000
Any function can be selected at any time by pressing the appropriate button (unless password restrictions apply). The order as presented in this manual is appropriate for an initial setup.
Each of these functions is described in greater detail in the following procedures. The VFD screen text that accompanies each operation is reproduced, at the appropriate point in the procedure, using
ARIAL NARROW bolded type style. Pushbutton names are printed in
Oblique type.
4.3 The System Function
The subfuctions of the System function are described below. Specific procedures for their use follow the descriptions:
Auto-Cal: Used to define an automatic calibration sequence
and/or start an Auto-Cal.
PSWD: Security can be established by choosing a 5 digit
password (PSWD) from the standard ASCII character set. (See Installing or Changing the Password, below, for a table of ASCII characters available.) Once a unique password is assigned and activated, the operator MUST enter the UNIQUE password to gain access to set-up functions which alter the instrument's operation, such as setting the instrument span or zero setting, adjusting the alarm setpoints, or defining analysis ranges.
After a password is assigned, the operator must log out to activate it. Until then, anyone can continue to operate the instrument without entering the new password.
Only one password can be defined. Before a unique password is assigned, the system assigns TETAI by default. This allows access to anyone. After a unique password is assigned, to defeat the security, the password must be changed back to TETAI.
Logout: Logging out prevents unauthorized tampering with
analyzer settings.
More: Select and enter More to get a new screen with
additional subfunctions listed.
Self–Test: The instrument performs a self-diagnostic test to
check the integrity of the power supply, output boards and amplifiers.
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Oxygen Analyzer Operation
Version: Displays Manufacturer, Model, and Software
Version of instrument.
Xout: This function provides the capability for the analog
output to track negative readings, by introducing an offset on the zero baseline.
Neg: The operator selects whether display can show
negative oxygen readings or not.
TRAK/HLD: The oper ator sets whether the instrument analog
out puts t rack t he concentration change during calibration and set s a ti me del ay for the concentration alar ms aft er cal ibrati on.
Filter: This is to set the response time of the digital filter in
the LO range.
GasBkgn: Set the gas correction factor. This function adjusts
the calibration of the sensor when the background gas is changed.
Trbsht: Displays useful information for troubleshooting
purposes.
TempComp: Compensates the zero baseline temperature
drift by setting the temperature coefficient of the sensor in ppb/degrees C.
Temperature: Displays sensor temperature.
4.3.1 Tracking Oxygen Readings During Calibration and Alarm Delay
The user has the option of setting the preference as to whether the analog outputs track the display readings during calibration or not. To set the preference, press the System key once and the first System menu will appear in the VFD display:
TRAK/HLD Auto-Cal PSWD Logout More
TRAK/HLD
the ENTER key once:
should be blinking. To enter this system menu press
Output Sttng: TRACK Alarm Dly: 10 min
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Operation BDS 3000
Or
Output Sttng: HOLD Alarm Dly: 10 min
In the first line, TRACK or HOLD should be blinking. The operator
can toggle between When
TRACK is selected, the analog outputs (0-1 VDC and 4-20 mA)
TRACK and HOLD with the Up or Down keys.
and the range ID contacts will track the instrument readings during calibration (either zero or span). TRACK is the factory default.
When HOLD is selected, the analog outputs (0-1 VDC and 4-20
mA) and the range ID contacts will freeze on their last state before entering one of the calibration modes. When the instrument returns to the Analyze mode, either by a successful or an aborted calibration, there will be a three-minute delay before the analog outputs and the range ID contacts start tracking again.
The concentration alarms freeze on their last state before entering
calibration regardless of selecting HOLD or TRACK. But, when HOLD is selected the concentration alarms will remain frozen for the time displayed in the second line of the
TRAK/HLD menu after the analyzer
returns to the Analyze mode.
The factory default is three minutes, but the delay time is programmable. To adjust to delay time use the Left or Right arrow keys. When the time displayed on the second line blinks, it can be adjusted by Pressing the Up or Down keys to increase or decrease its value. The minimum delay is 1 minute, the maximum is 30.
This preference is stored in non-volatile memory so that it is recovered if power is removed from the instrument.
4.3.2 Setting up an Auto-Cal
When proper automatic valving is connected (see Chapter 3, Installation), the Analyzer can cycle itself through a sequence of steps that automatically calibrates the instrument.
Note: If you require highly accurate Auto-Cal timing, use external
Auto-Cal control where possible. The internal clock in the Model BDS 3000 is accurate to 2-3 %. Accordingly, internally scheduled calibrations can vary 2-3 % per day.
To setup an Auto–Cal cycle:
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Oxygen Analyzer Operation
CAUTION: FREQUENT ZERO ADJUSTMENTS OF THE CELL IS
NOT RECOMMENDED. A NEWLY INSTALLED CELL MAY TAKE 7-10 DAYS OF OPERATION TO REACH A STEADY ZERO (TYPICALLY LESS THAN 5 PPB). IF REQUIRED, THE INSTRUMENT MAY BE ZEROED AFTER THIS INITIAL STABILIZING PERIOD AND MAY BE CHECKED AGAIN AFTER AN ADDITIONAL 7-10 DAY PERIOD. THE FREQUENCY OF ZERO ADJUSTMENT IS AT THE DISCRETION OF THE USER (ONCE A MONTH IS SUGGESTED).
Choose System from the Function buttons. The LCD will display
five subfunctions.
TRAK/HLD Auto—Cal PSWD Logout More
Use < > arrows to blink Auto—Cal, and press Enter. A new screen
for Span/Zero set appears.
Span OFF Nxt: 0d 0h Zero OFF Nxt: 0d 0h
Press < > arrows to blink Span (or Zero), then press ENTER again.
(You won’t be able to set OFF to ON if a zero interval is entered.) A
Span Every ... (or Zero Every ...) screen appears.
Span Every 0 d Start 0 h from now
Use __ arrows to set an interval value, then use __ arrows to move
to the start-time value. Use DÑ arrows to set a start-time value.
To turn ON the Span and/or Zero cycles (to activate Auto-Cal):
Press System again, choose
Auto—Cal, and press ENTER again. When
the Span/Zero values screen appears, use the < > arrows to blink the Span (or Zero) OFF/ON field. Use _ arrows to set the OFF/ON field to
ON. You can now turn these fields ON because there is a nonzero span interval defined.
4.3.3 Password Protection
If a password is assigned, then setting the following system
parameters can be done only after the password is entered: span and zero settings, alarm setpoints, analysis range definitions, switching between
autoranging and manual override, setting up an auto-cal, and assigning a
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Operation BDS 3000
new password. However, the instrument can still be used for analysis or for initiating a self-test without entering the password.
If you have decided not to employ password security, use the default password TETAI. This password will be displayed automatically by the microprocessor. The operator just presses the ENTER key to be allowed total access to the instrument’s features.
Note: If you use password security, it is advisable to keep a copy
of the password in a separate, safe location.
4.3.3.1 ENTERING THE PASSWORD
To install a new password or change a previously installed password, you must key in and ENTER the old password first. If the default password is in effect, pressing the ENTER button will enter the default TETAI password for you.
Press System to enter the System mode.
TRAK/HLD Auto—Cal PSWD Logout More
Use the __arrow keys to scroll the blinking over to PSWD, and press ENTER to select the password function. Either the default TETAI
password or AAAAA place holders for an existing password will appear on screen depending on whether or not a password has been previously installed.
T E T A I Enter PWD
or
A A A A A Enter PWD
The screen prompts you to enter the current password. If you are not using password protection, press ENTER to accept TETAI as the default password. If a password has been previously installed, enter the password using the < > arrow keys to scroll back and forth between letters, and the __ arrow keys to change the letters to the proper
password. Press ENTER to enter the password.
If the password is accepted, the screen will indicate that the password restrictions have been removed and you have clearance to proceed.
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Oxygen Analyzer Operation
PSWD Restrictions Removed
In a few seconds, you will be given the opportunity to change this
password or keep it and go on.
Change Password? <ENT>=Yes <ESC>=No
Press ESCAPE to move on, or proceed as in Changing the
Password, below.
4.3.3.2 INSTALLING OR CHANGING THE PASSWORD
If you want to install a password, or change an existing password, proceed as above in Entering the Password. When you are given the opportunity to change the password:
Change Password? <ENT>=Yes <ESC>=No
Press ENTER to change the password (either the default TETAI or the previously assigned password), or press ESCAPE to keep the existing password and move on.
If you chose ENTER to change the password, the password assignment screen appears.
T E T A I <ENT> To Proceed
or
A A A A A <ENT> To Proceed
Enter the password using the __ arrow keys to move back and forth between the existing password letters, and the __ arrow keys to change the letters to the new password. The full set of 94 characters available
for password use are shown in Table 4-1 below.
When you have finished typing the new password, press Enter. A verification screen appears. The screen will prompt you to retype your password for verification.
A A A A A Retype PWD To Verify
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Operation BDS 3000
Wait a moment for the entry screen. You will be given clearance to
proceed.
A A A A A <ENT> TO Proceed
Table 4-1: Characters Available for Password Definition:
ABCDE F GHI J KLMNOP QRS T UVWXYZ[ ¥ ] ^ _` abcdefgh ijklmnopqr stuvwxyz{| }®! "#$%&' ( )*+' -. /012 3456789: ; < =>?@
Use the arrow keys to retype your password and press ENTER when finished. Your password will be stored in the microprocessor and the system will immediately switch to the Analyze screen, and you now have access to all instrument functions.
If all alarms are defeated, the Analyze screen appears as:
0.0 ppm Anlz Range: 0 — 100
If an alarm is tripped, the second line will change to show which alarm it is:
0.0 ppm Anlz AL—1
Note: If you log off the system using the logout function in the
system menu, you will now be required to re-enter the password to gain access to Span, Zero, Alarm, and Range functions.
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Oxygen Analyzer Operation
4.3.4 Logout
The Logout function provides a convenient means of leaving the analyzer in a password protected mode without having to shut the instrument off. By entering instrument leaving the system protected against use until the password is reentered. To log out, press the System button to enter the System function.
Use the __ arrow keys to position the blinking over the Logout function, and press ENTER to Log out. The screen will display the
message:
Logout, you effectively log off the
TRAK/HLD Auto—Cal PSWD Logout More
Protected Until Password Reentered
4.3.5 System Self-Diagnostic Test
The Model BDS 3000 has a built-in self-diagnostic testing routine. Pre-programmed signals are sent through the power supply, output board and sensor circuit. The return signal is analyzed, and at the end of the test the status of each function is displayed on the screen, either as OK or as a number between 1 and 3. (See System Self Diagnostic Test in Chapter 5 for number code.)
The self diagnostics are run automatically by the analyzer whenever the instrument is turned on, but the test can also be run by the operator at will. To initiate a self diagnostic test during operation:
Press the System button to start the System function.
TRAK/HLD Auto—Cal PSWD Logout More
Use the < > arrow keys to blink More, then press Enter.
Version Diag Xout Neg-Y Filter-10 More
Use the __arrow keys again to move the blinking to the Self–Test function. The screen will follow the running of the diagnostic.
RUNNING DIAGNOSTIC Testing Preamp — 83
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Operation BDS 3000
During preamp testing there is a countdown in the lower right corner of the screen. When the testing is complete, the results are displayed.
Power: OK Analog: OK Preamp: 3
The module is functioning properly if it is followed by OK. A number indicates a problem in a specific area of the instrument. Refer to Chapter 5 Maintenance and Troubleshooting for number code information. The results screen alternates for a time with:
Press Any Key To Continue . . .
Then the analyzer returns to the initial System screen.
4.3.6 Version Screen
Move the __arrow key to More and press Enter. With Version blinking, press Enter. The screen displays the manufacturer, model, and
software version information.
4.3.7 Filter Function
The response time on the most sensitive range (ppb range) is user definable from approximately 1-60 minutes. The adjustable filter allows the user to tune the response of the analyzer to best balance sensor noise and response time requirements. The factory default setting is 5 minutes. The actual response time will depend on the user’s sample system (the length and size the tubing of tubing as well as the sample flow rate).
The filter setting can be accessed by selecting SYSTEM on the keypad followed by MORE on the display with the __keys. The filter
function is then selected and changed using the arrow keys. Press ENTER and ANALYZE to return to analyze mode.
In the event of an over-range condition, the filter rate will automatically switch to a faster setting (approximately 45 sec. response time) for the duration of the over-range or upset condition. This feature allows the analyzer to quickly respond to and track an upset condition.
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Oxygen Analyzer Operation
4.3.8 Negative Value Display
The operator is able to set the display not to show negative readings. To access this option, Press the SYSTEM key and access the second screen of the System menu:
Version Diag Xout Neg-N Filter-5 More
By using the Left or Right keys, the Neg- field can be accessed. Once that field is selected, use the Up or Down keys to toggle from
Y or Y to N. Setting to N means that when the reading of the sensor
N to
drifts negative, the display will stay at zero. To follow negative upsets, set this field to Y. The default setting is N.
4.3.9 The Gas Correction Factor
When the background gas is changed. this function can adjust the calibration of the instrument to compensate for the sensor change of output. This is helpful when the gas background needs to be changed and only a calibration bottle with nitrogen background is used. The default setting is 1.00, for nitrogen gas background. To set this factor, press the System key and access the third screen:
GasBkgnd TempComp
o
Trbsht temp: 21.0
C
Select GasBkgnd and press the ENTER key to see the function screen:
Gas Background Correction: 1.00
Use the Up or Down keys to adjust the value. The working range is
0.25 to 2.50. This factor will divide the output. For example if the factor is set to 2.00, the output of the sensor, when read by the electronics will be divided by two.
Special consideration on the working range: Changing the gas correction factor has an effect on the maximum working range of the analyzer, e.g.: if a gas factor of 2.00 is selected the maximum working range of the analyzer is 50 ppm. Any reading above this, may saturate the amplifier. The automatic sensor shutdown function will become
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Operation BDS 3000
active automatically when the reading goes over 50 ppm as described in Section 3.6.
4.3.10 Troubleshooting Screen
This System function provides access to troubleshooting information. This information will be helpful to TAI technical support staff.
Note: To use this function, it is recommended that known span
gas be flowing through the system before entering this function.
Once the span gas has been flowing for at least five minutes, Press the SYSTEM key and access the
Trbsht on the third screen.
GasBkgnd TempComp Trbsht
Press the ENTER key. The VFD display will scroll through four screens with a five seconds delay each. The values shown are frozen from the moment the System key was pressed (that is why is important not to enter the System menu until span gas has flowed for a while).
First Screen:
FCalib_factor = 4.581 (slope calibration, default value
shown)
AtoD_Ave =115810 (Average ADC count reading of
sensor amplifier on the span gas, range: 0 to 260,000)
Second Screen:
lOffset[0] = 2480 (ADC count of offset of the first
gain of sensor amplifier)
lOffset[1] = 2430 (ADC count of offset of the second
gain of sensor amplifier)
Third Screen:
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Oxygen Analyzer Operation
lOffset[2] = 2327 (ADC count of offset of the third
gain of sensor amplifier)
lOffset[3] = 2330 (ADC count of offset of the fourth
gain of sensor amplifier)
Fourth Screen:
tempOffset = 2190 (ADC count of offset of
temperature amplifier)
Current_gain= 1 (current gain of sensor amplifier on
span gas)
4.3.11 Temperature
The temperature of the sensor is displayed on the third screen or system menu, and is shown in degrees centigrade. If sensor cable is disconnected, the display will show either “> 50” or “ < 0”.
4.3.12 Extended Analog Output Function
To access this function, press the SYSTEM key to enter it’s menu. Select the More function to move on to the second screen of the system menu.
Version Diag Xout Neg-Y Filter-10 More
Select Xout and press ENTER to get to the extended output setup menu.
Output Offst: 10% FS Neg. Analog Offset
The number on the first line is adjustable using the Up and Down keys between 0 and 50. This function makes it possible to track negative readings in the analog output, since the analog outputs do not go below zero volts or 4 mA DC. Provided that negative readings are allowed ( this is set in the system menu as well ).
If the value is set to zero of FS (full scale), the analog outputs work in standard form and this is the default.
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Operation BDS 3000
Reading on 0 to 1 VDC 4-20 mA DC
Display Output Output
0 % of FS 0.0 4.0
100 % of FS 1.0 20.0
If the value is set to 10% of FS:
Reading on 0 to 1 VDC 4-20 mA DC
Display Output Output
-10 % of FS 0.00 4.0 0 % of FS 0.91 5.45
100 % of FS 1.00 20.0
4.3.13 Zero Baseline Temperature Compensation
The BDS Sensor is temperature compensated when not on zero gas. The “Span” temperature coefficient from sensor to sensor is not very different. The software will do this temperature compensation without the need to enter a coefficient. The BDS Sensor baseline exhibits temperature dependency too and it is different from sensor to sensor. A temperature coefficient must be entered into the analyzer in order to compensate for diurnal temperature drifts. The coefficient ranges from
0.50 to 1.75 ppb/°C.
To access this function, press the SYSTEM key to enter it’s menu. Select the More function to move on to the second screen of the system menu. Select More one more time to go on to the third screen of the system menu.
GasBKgnd TempComp Trbsht Temp: 24.3 C
Select TempComp and press ENTER to get to the temperature coeficient setup menu:
Set BDS sensor temp
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Oxygen Analyzer Operation
0.00 ppb/degree C
The number on the second line is adjustable using the Up and Down arrow keys between 0.00 and 10.0. The coefficient is different from sensor to sensor and it’s entered into the analyzer at the factory before shipping. If the sensor is replaced, a new coefficient must be entered. TAI can give the coefficient or it may be estimated.
To estimate it in the field:
1. Set the coefficient to zero.
2. Run the analyzer on “Zero” calibration gas for two weeks or once stability of its baseline is reached.
3. After the sensor has been purged for at least two weeks and it’s baseline is stable, monitor the reading and ambient temperature over a minimum period of 24 hours. Take the maximum and minimum readings, and the maximum and minimum temperature readings.
4. Calculate the coefficient using the relation:
Coefficient = (O2 max - O2 min) ÷ (Temp max - Temp min) For example: In a 24 hour run:
O
max = 3.55 ppb
2
O2 min = 1.75 ppb Temp max = 24.5 degrees C. Temp min = 22.1 degrees C.
Coefficient = (3.55-1.75)ppb ÷ (24.5-22.1) °C = 0.75 °C.
4.4 Calibration of the Analyzer
The analyzer must be calibrated prior to its use. For most applications where the desired range of measurement is 0 to 10 ppm, or less we recommend the analyzer be calibrated using a span gas with a concentration between 7.0 to 9.0 ppm oxygen in nitrogen. This will require that calibration be performed in the 0-10 ppm analyzer range.
Before the cell is ready for calibration, it must be purged with sample gas to a low oxygen level—preferably below 0.1 ppm. If the
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Operation BDS 3000
oxygen content of the sample gas is higher than 0.1 ppm, a zero gas such as nitrogen having an oxygen concentration below 0.1 ppm may be required.
4.4.1 Zero Cal
The BDS Sensor has a zero offset of less than 5 ppb oxygen. Normally, the offset slowly decreases during the first 7 to 10 days of operation, and is expected to reach a steady value after this time.
Generally, the value of the zero offset is part of the oxygen reading of the sample gas as shown by the analyzer readout. As an example, a reading of 5 ppb oxygen may include 0.4 ppm oxygen in the sample gas and a 5 ppb zero offset.
The determination of the zero offset requires the use of oxygen free gas to the analyzer. We recommend the use of nitrogen gas with a scrubber to assure oxygen levels below 0.1 ppb.
The user may decide to eliminate the zero offset for improved accuracy. If so desired, the analyzer is equipped to provide this function. However, we do not recommend carrying out the cal zero during the first 10 days of the operation of the cell.
The ZERO button on the front panel is used to enter the zero calibration function. Zero calibration can be performed in either the automatic or manual mode. In the automatic mode, an internal algorithm compares consecutive readings from the sensor to determine when the output is within the acceptable range for zero. In the manual mode, the operator determines when the reading is within the acceptable range for zero. Make sure the zero gas is connected to the instrument. If you get a
CELL FAILURE message skip to section 4.4.1.3.
4.4.1.1 AUTO MODE ZEROING
Press ZERO to enter the zero function mode. The screen allows you to select whether the zero calibration is to be performed automatically or manually. Use the
zero settling. Stop when AUTO appears, blinking, on the display.
arrow keys to toggle between AUTO and MAN
__
Zero: Settling: AUTO <ENT> To Begin
Press ENTER to begin zeroing.
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Oxygen Analyzer Operation
#### PPM Zero Slope = #### ppm/s
The beginning zero level is shown in the upper left corner of the display. As the zero reading settles, the screen displays and updates information on slope (unless the slope starts within the acceptable zero range and does not need to settle further).
Then, and whenever slope is less than 0.08 for at least 3 minutes, instead of slope you will see a countdown: 5 Left, 4 Left, and so fourth. These are five steps in the zeroing process that the system must complete, AFTER settling, before it can go back to Analyze.
#### PPM Zero 4 Left = ### ppm/s
The zeroing process will automatically conclude when the output is within the acceptable range for a good zero. Then the analyzer automatically returns to the Analyze mode.
Because the reading of the slope is not very sensitive, it is recommended that zero gas be purging a few minutes before starting the Auto mode zeroing. This will ensure cell stability on the new Zero settings.
4.4.1.2 MANUAL MODE ZEROING
Press ZERO to enter the Zero function. The screen that appears allows you to select between automatic or manual zero calibration. Use the
keys to toggle between AUTO and MAN zero settling. Stop when
__
MAN appears, blinking, on the display.
Zero: Settling: Man <ENT> To Begin
Press ENTER to begin the zero calibration. After a few seconds the first of five zeroing screens appears. The number in the upper left-hand corner is the first-stage zero offset. The microprocessor samples the output at a predetermined rate. It calculates the differences between successive samplings and displays the rate of change as slope= a value in parts per million per second (ppm/s).
#### ppm Zero Slope = #### ppm/s
Note: It takes several seconds for the true slope value to display.
Wait about 10 seconds. Then, wait until Slope is
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Operation BDS 3000
sufficiently close to zero before pressing ENTER to finish zeroing .
Generally, you have a good zero when sl ope is less than 0.05 ppm/s for about 30 seconds. When slope is close enough to zero, press ENT ER. In a f ew seconds, the screen will update.
Once zero settling is completed, the information is stored in the microprocessor, and the instrument automatically returns to the Analyze mode.
4.4.2 Span Cal
The SPAN button on the front panel is used to span calibrate the analyzer. Span calibration can be performed using the automatic mode, where an internal algorithm compares consecutive readings from the sensor to determine when the output matches the span gas concentration. Span calibration can also be performed in manual mode, where the operator determines when the span concentration reading is acceptable and manually exits the function.
4.4.2.1 AUTO MODE SPANNING
Press SPAN to enter the span function. The screen that appears allows you to select whether the span calibration is to be performed automatically or manually. Use the
AUTO and MAN span settling. Stop when AUTO appears, blinking, on
the display.
Span: Settling: AUTO <ENT> For Next
Press ENTER to move to the next screen.
Calib. Holding time Cal hold: 5 min
This menu allows the operator to set the time the analyzer should be held in the AUTO span mode, after the readings of the analyzer settle. Five minutes is the default, but it could be adjusted anywhere from 1 to 60 minutes by using the UP or DOWN keys.
Press ENTER to move to the next screen.
Span Val: 008.00 ppm <ENT>Span <UP>Mod #
arrow keys to toggle between
__
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Oxygen Analyzer Operation
Use the
arrow keys to enter the oxygen-concentration mode
__
(999.99 ppm is maximum value of span gas allowed). Use the__arrow keys to blink the digit you are going to modify. Use the
arrow keys
__
again to change the value of the selected digit. When you have finished typing in the concentration of the span gas you are using, press ENTER to begin the Span calibration.
#### ppm Span Slope = #### ppm/s
The beginning span value is shown in the upper left corner of the display. As the span reading settles, the screen displays and updates information on slope. Spanning automatically ends when the span output corresponds, within tolerance, to the value of the span gas concentration. Then the instrument automatically returns to the analyze mode.
4.4.2.2 MANUAL MODE SPANNING
Press SPAN to start the Span function. The screen that appears allows you to select whether the span calibration is to be performed automatically or manually.
Span: Settling: MAN <ENT> For Next
Use the
keys to toggle between AUTO and MAN span settling.
__
Stop when MAN appears, blinking, on the display. Press ENTER to move to the next screen.
Press ENTER to move to the next screen.
Calib. Holding time Cal hold: 5 min
This menu allows the operator to set the time the analyzer should be held in the AUTO span mode. It does not have any effect in the
MANual mode. Just press ENTER key to continue.
Span Val: 008.00ppm <ENT>Span <UP>Mod #
Press _(<UP>) to permit modification (Mod #) of span value.
Use the arrow keys to enter the oxygen concentration of the span gas you are using (999.99 is maximum value of span gas). The
__
choose the digit, and the __arrows choose the value of the digit.
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arrows
Operation BDS 3000
Press ENTER to enter the span value into the system and begin the
span calibration.
Once the span has begun, the microprocessor samples the output at a predetermined rate. It calculates the difference between successive samplings and displays this difference as a slope on the screen. It takes several seconds for the first slope value to display. Slope indicates the rate of change of the span reading. It is a sensitive indicator of stability.
#### % Span Slope = #### ppm/s
When the span value displayed on the screen is sufficiently stable, press ENTER. (Generally, when the Span reading changes by 1 % or less of the full scale of the range being calibrated, for a period of ten minutes it is sufficiently stable.) Once ENTER is pressed, the span reading changes to the correct value. The instrument then automatically enters the Analyze function.
4.4.3 Span Failure
The analyzer checks the output of the cell at the end of the span. If the raw output of the cell is less than 1.5 nA/ppb or more than 13.5 nA/ppb O2, the span will not be accepted. The analyzer will return to the previous calibration values, trigger the System Alarm, and display in the VFD:
Span Failed!!
This message will be shown for five seconds and the instrument shall return to the Analyze mode. In the upper right hand corner of the VFD display operator troubleshoot in case calibration was initiated remotely. To reset the alarm and the flag message, the analyzer must be properly spanned.
A trace cell is unlikely to fail span. As explained before, when the sensor reaches the end of its useful life, the zero offset begins to rise until the analyzer finds the zero unsatisfactory. Nevertheless, feeding the wrong span gas or electronics failure could set this feature off at the end of the span. Consider this before replacing the cell.
FCAL will be shown. This message flag will help the
4.5 The Alarms Function
The Model BDS 3000 is equipped with 2 fully adjustable concentration alarms and a system failure alarm. Each alarm has a relay
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Oxygen Analyzer Operation
with a set of form “C" contacts rated for 3 amperes resistive load at 250 VAC. See Figure 3-5 in Chapter 3, Installation and/or the Interconnection Diagram included at the back of this manual for relay terminal connections.
The system failure alarm has a fixed configuration as described in
Chapter 3 Installation.
The concentration alarms can be configured from the front panel as either high or low alarms by the operator. The alarm modes can be set as latching or non-latching, and either failsafe or non-failsafe, or, they can be defeated altogether. The setpoints for the alarms are also established using this function.
Decide how your alarms should be configured. The choice will depend upon your process. Consider the following four points:
1. Which if any of the alarms are to be high alarms and which if any are to be low alarms?
Setting an alarm as HIGH triggers the alarm when the oxygen concentration rises above the setpoint. Setting an alarm as LOW triggers the alarm when the oxygen concentration falls below the setpoint.
Decide whether you want the alarms to be set as:
Both high (high and high-high) alarms, or
One high and one low alarm, or
Both low (low and low-low) alarms.
2. Are either or both of the alarms to be configured as failsafe?
In failsafe mode, the alarm relay de-energizes in an alarm condition. For non-failsafe operation, the relay is energized in an alarm condition. You can set either or both of the concentration alarms to operate in failsafe or non-failsafe mode.
3. Are either of the alarms to be latching?
In latching mode, once the alarm or alarms trigger, they will remain in the alarm mode even if process conditions revert back to non-alarm conditions. This mode requires an alarm to be recognized before it can be reset. In the non-latching mode, the alarm status will terminate when process conditions revert to non-alarm conditions.
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Operation BDS 3000
4. Are either of the alarms to be defeated? The defeat alarm mode is incorporated into the alarm circuit so
that maintenance can be performed under conditions which would normally activate the alarms.
The defeat function can also be used to reset a latched alarm. (See procedures, below.)
If you are using password protection, you will need to enter your password to access the alarm functions. Follow the instructions in section 4.3.3 to enter your password. Once you have clearance to proceed, enter the Alarm function.
Press the ALARM button on the front panel to enter the Alarm function. Make sure that AL–1 is blinking.
AL—1 AL—2 Choose Alarm
Set up alarm 1 by moving the blinking over to AL–1 using the arrow keys. Then press ENTER to move to the next screen.
AL—1 10.000 ppm HI Dft—N Fs—N Ltch—N
Five parameters can be changed on this screen:
Value of the alarm setpoint, AL–1 #### ppm (oxygen);
value can be set from 0 to 999 ppb + 1.000-1000.00 ppm.
Out-of-range direction, HI or LO
Defeated? Dft–Y/N (Yes/No)
Failsafe? Fs–Y/N (Yes/No)
Latching? Ltch–Y/N (Yes/No).
To define the setpoint, use the < > arrow keys to move the
blinking over to AL–1 ####. Then use the __arrow keys to change the number. Holding down the key speeds up the
incrementing or decrementing. (Remember, the setpoint units are ppm O2).
To set the other parameters use the
arrow keys to move the
__
blinking over to the desired parameter. Then use the __ arrow keys to change the parameter.
__
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Oxygen Analyzer Operation
Once the parameters for alarm 1 have been set, press ALARMS
again, and repeat this procedure for alarm 2 (AL–2).
To reset a latched alarm, go to Dft– and then press either D two
times or Ñ two times. (Toggle it to Y and then back to N.)
–OR – Go to
Ltch– and then press either
two times or _ two times.
_
(Toggle it to N and back to Y).
Alarm Hysterisis: There is alarm hysterisis to prevent chatter of the alarm contacts. It is set to 0.2 ppm for alarms set above 1 ppm, and 10 ppb for alarms set below 1 ppm.
4.6 The Range Function
The Range function allows the operator to program up to three concentration ranges to correlate with the DC analog outputs. If no ranges are defined by the user, the instrument defaults to:
Low = 0–100 ppb Med = 0–1 ppm High = 0–10 ppm.
The Model BDS 3000 is set at the factor y to default to autoranging. I n thi s mode, the microprocessor aut omatically r esponds to concent ration changes by swit ching ranges for optimum readout sensitivi ty. If the current range lim its ar e exceeded, the instrument wil l automatically shift to the next higher range. I f the concentration fall s to below 90% of full scale of the next lower range, the instr ument will switch to that range. A corresponding shi ft in the DC percent-of- range output , and in the range ID outputs, will be not iced.
The autoranging feature can be overridden so that analog output stays on a fixed range regardless of the oxygen concentration detected. If the concentration exceeds the upper limit of the range, the DC output will saturate at 1 VDC (20 mA at the current output).
However, the digital readout and the RS-232 output of the concentration are unaffected by the fixed range. They continue to read accurately with full precision. See Front Panel description in Chapter 1.
The automatic fourth range is always 0-1000 ppm and is not programmable.
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Operation BDS 3000
4.6.1 Setting the Analog Output Ranges
To set the ranges, enter the range function mode by pressing the
RANGE button on the front panel.
L—100 ppb M—1 ppm H—10 ppm Mode—AUTO
Use the __arrow keys to blink the range to be set: low (L), medium
(M), or high (H).
Use the __ arrow keys to enter the upper value of the range (all
ranges begin at 0). Repeat for each range you want to set. Press ENTER to accept the values and return to Analyze mode. (See note below.)
Note: The ranges must sequentially increase from low to high, for
example, if range 1 is set as 0–500 ppb and range 2 is set as 0–10 ppm, range 3 cannot be set as 0– 5 ppm since it is lower than range 2.
Ranges, and alarms, are set in ppb or ppm units depending on concentration. All concentration-data outputs change from ppb units to ppm when the concentration is above 1.0 ppm. Range Low (L) is always a ppb range and cannot be set higher than 1000 ppb nor lower than 10 ppb. The medium (M) and High (H) ranges can only be set in ppm. The Medium (M) range can be set between 1 and 10 ppm, while the high (H) range can be set between 10 and 1000 ppm.
Note: Refer to Section 4.3.9 to find maximum working range.
4.6.2 Fixed Range Analysis
The autoranging mode of the instrument can be overridden, forcing the analyzer DC outputs to stay in a single predetermined range.
To switch from autoranging to fixed range analysis, enter the range function by pressing the RANGE button on the front panel.
Use the
Use the __ arrow keys to switch from AUTO to FX/L, FX/M, or
FX/H to set the instrument on the desired fixed range (low, medium, or
high).
arrow keys to move the blinking over AUTO.
__
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Oxygen Analyzer Operation
4.7 The Analyze Function
Normally, all of the functions automatically switch back to the Analyze function when they have completed their assigned operations. Pressing the ESCAPE button in many cases also switches the analyzer back to the Analyze function. Alternatively, you can press the ANALYZE button at any time to return to analyzing your sample.
4.8 Signal Output
The standard Model BDS 3000 Oxygen Analyzer is equipped with two 0–1 VDC analog output terminals accessible on the back panel (one concentration and one range ID), and two isolated 4–20 mA DC current outputs (one concentration and one range ID).
See Rear Panel in Chapter 3, Installation, for illustration.
The signal output for concentration is linear over the currently selected analysis range. For example, if the analyzer is set on a range that was defined as 0–100 ppm O2, then the output would be as shown in Table 4-2.
Table 4-2: Linear Output for a 0-100 ppm O2 Range
Voltage Signal Current Signal
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Operation BDS 3000
ppm O
2
0 0.0 4.0
10 0.1 5.6
20 0.2 7.2
30 0.3 8.8
40 0.4 10.4
50 0.5 12.0
60 0.6 13.6
70 0.7 15.2
80 0.8 16.8
90 0.9 18.4
100 1.0 20.0
Output (VDC) Output (mA DC)
The analog output signal has a voltage which depends on the oxygen concentration AND the currently activated analysis range. To relate the signal output to the actual concentration, it is necessary to know what range the instrument is currently on, especially when the analyzer is in the autoranging mode.
To provide an indication of the range, a second pair of analog output terminals are used. They generate a steady preset voltage (or current when using the current outputs) to represent a particular range. Table 4-3 gives the range ID output for each analysis range.
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Oxygen Analyzer Operation
Table 4-3: Range ID Output
Range Voltage (V) Current (mA)
LO 0.25 8
MED 0.50 12
HI 0.75 16
(0-1000) ppm 1.00 20
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Operation BDS 3000
Figure 4-2: Analyzer Power-up Sequence
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Oxygen Analyzer Operation
Figure 4-3: Analyzer Span Sequence
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Operation BDS 3000
Figure 4-4: Analyzer Zero Sequence
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Oxygen Analyzer Maintenance
Maintenance
5.1 Routine Maintenance
Aside from normal cleaning and checking for leaks at the gas connections, routine maintenance is limited to refilling sensor with deionized water replace burned fuses, and recalibration. For recalibration, see Section 4.4 Calibration.
WARNING: SEE WARNINGS ON THE TITLE PAGE OF THIS
MANUAL.
5.2 Adding Water to the BDS Sensor
When running dry gas through the sensor, water is extracted from the electrolyte. Therefore, the electrolyte level should be checked periodically. When the electrolyte level is low, only de-ionized water or distilled water should be added into the sensor. It typically takes about four months to dry the electrolyte from the MAX line to the MIN line when the sensor is operated on a bone dry gas line.
It is not necessary to turn off the power to the analyzer while adding water, but care should be taken that no water is splashed outside the sensor. Spilling water on the PC board could cause serious damage to the analyzer and electric shock to the personal.
Unscrew and take the sensor cap off. Use the wash bottle provided to squeeze de-ionized water into the sensor, as shown in Figure 5.1. It is a good practice that water is added before reaching the MIN line. Reinstall the cap after adding water.
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Maintenance BDS 3000
Figure 5.1 Adding water into the BDS sensor
WARNING: THE SENSOR USED IN THE MODEL BDS 3000
OXYGEN ANALYZER USES ELECTROLYTE WHICH CONTAINS POTASSIUM HYDROXIDE, THAT CAN BE HARMFUL IF TOUCHED, SWALLOWED, OR INHALED. AVOID CONTACT WITH ANY FLUID OR POWDER IN OR AROUND THE UNIT. WHAT MAY APPEAR TO BE PLAIN WATER COULD BE THE ELECTROLYTE. IN CASE OF EYE CONTACT, IMMEDIATELY FLUSH EYES WITH WATER FOR AT LEAST 15 MINUTES. CALL PHYSICIAN. (SEE APPENDIX, MATERIAL SAFETY DATA SHEET.)
5.3 Fuse Replacement
1. Place small screwdriver in notch, and pry cover off, as shown in Figure 5-2.
2. To change between American and European fuses, remove the single retaining screw, flip Fuse Block over 180 degrees, and replace screw.
3. Replace fuse as shown in Figure 5-3.
4. Reassemble Housing as shown in Figure 5-2.
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Oxygen Analyzer Maintenance
Figure 5-2: Removing Fuse Block from Housing
American Fuses European Fuses
Figure 5-3: Installing Fuses
5.4 System Self Diagnostic Test
1. Press the SYSTEM button to enter the system mode.
2. Use the __arrow keys to move to More, and press ENTER.
3. Use the__arrow keys to move to Self-Test, and press ENTER.
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Maintenance BDS 3000
The following failure codes apply:
Table 5-1: Self-Test Failure Codes
Power
0OK 15 V Failure 2 15 V Failure 3 Both Failed
Analog
0OK 1 DAC A (0–1 V Concentration) 2 DAC B (0–1 V Range ID) 3 Both Failed
Preamp
0OK 1 Zero too high 2 Amplifier output doesn't match test input 3 Both Failed
5.5 Major Internal Components
T he S ensor i s accessed by unl at chi ng and swi nging open the f r ont panel , as descr ibed earl i er . Ot her i nternal component s are accessed by r em oving t he rear panel and sli ding out t he enti r e chassis. See F igure 5- 4, bel ow. The gas pi pi ng is il lust r at ed in F igure 2- 3, and the maj or el ectr oni c com ponents l ocati ons are shown in Fi gur e 2- 7, in Chapter 2.
WARNING: SEE WARNINGS ON THE TITLE PAGE OF THIS
MANUAL.
The BDS 3000 contains the following major components:
Analysis Section
Sensor with stainless steel wetted parts Sample system
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Oxygen Analyzer Maintenance
Power Supplies
Microprocessor
Displays
5 digit LED meter 2 line, 20 character, alphanumeric, VFD display
RS-232 Communications Port.
See the drawings in the Drawings section in back of this manual for
details.
Figure 5-4: Rear Panel Screws
To detach the rear panel, remove only the 14 screws marked with
an X.
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Maintenance BDS 3000
5.6 Cleaning
If the instrument is unmounted at time of cleaning, disconnect the instrument from the power source. Close and latch the front-panel access door. Clean outside surfaces with a soft cloth dampened slightly with plain clean water. Do not use any harsh solvents such as paint thinner or benzene.
For panel-mounted instruments, clean the front panel as prescribed in the above paragraph. DO NOT wipe front panel while the instrument is controlling your process.
5.7 Troubleshooting
Symptoms Possible causes and Solutions
Read higher than expected (1), (2), (3) Read lower than expected (2), (3) Read negative (3), (4) Noise signal (3), (5) Slow response (5)
Causes and solution keys:
(1) Gas leak: Make sure to use new VCR gaskets, high quality
valves and gas regulator for the sampling system. Tighten each connection.
(2) Improper gas flow rate: adjust the inlet pressure to obtain 0.5 –
1 SLPM flow rate.
(3) Improper calibration of the analyzer: Turn the analyzer off,
then turn back on again. Press the SYSTEM key when prompted by the analyzer “Press the System for default Values”. This will return the analyzer to its defaults settings in calibration and zero values. Recalibrate the analyzer with a high quality standard gas
if it is necessary. (4) Just after adding water: The analyzer will recover by itself. (5) Gas entered and is trapped in the sensor: This could happen if
the sensor is filled with the electrolyte improperly, or the sensor
is pressurized because of a clogged vent. To remedy this
Teledyne Analytical Instruments 70
Oxygen Analyzer Maintenance
situation, uninstall the sensor and take off the cap carefully, then apply a vacuum degas process as shown in the Figure 5-5. Degassing in a 28 inch mercury vacuum for 5 minutes is sufficient to remove the gas bubbles. Reinstall the sensor into the analyzer.
Note: A low cost vacuum degas kit (TAI P/N B72098) is available
from Teledyne Analytical Instruments.
Figure 5-5: Vacuum Degassing for the BDS Oxygen Sensor
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Maintenance BDS 3000
Teledyne Analytical Instruments 72
Oxygen Analyzer Appendix
Appendix
A-1 Specifications
Packaging: General Purpose
• Flush panel mount (Standard).
• Relay rack mount. Contains one instrument in one 19" relay rack mountable plate (Optional).
Sensor: Teledyne BDS Sensor, patent pending.
Sample System: All wetted parts of 316 stainless steel with
built-in restrictor.
90 % Response Time: Less than 90 seconds at 25 °C (77 °F) on
10, and 100 ppm range. 90 seconds on 1000ppb range.
Software programmable response in 100 ppb range from 1 minute to 60 minutes. Default is 5 minutes response time.
Ranges: Three user definable ranges from
0–100 ppb to 0–100 ppm, plus over range of 0-100 ppm.
Autoranging with range ID output.
Alarms: One system-failure alarm contact to detect
power failure or sensor-zero and span failure.
Two adjustable concentration threshold alarm contacts with fully programmable setpoints.
Displays: 2-line by 20-character, VFD screen, and
one 5 digit LED display.
Teledyne Analytical Instruments 73
Appendix BDS 3000
Digital Interface: Full duplex RS-232 communications port.
Power: Universal power supply 85-250 V ac, at
47-63 Hz.
Operating Temperature: 5-40 °C
Accuracy: ±2% of full scale for all ranges at constant
temperature.
All accuracy specifications are contingent upon the completion of zero and span calibration.
All accuracy is established at constant pressure and equilibrium has been established.
Analog outputs: 0-1 V dc percent-of-range,
0-1 V dc range ID. 4-20 mA dc (isolated) percent-of-range, 4-20 mA dc (isolated) range ID.
Dimensions: 19 cm high, 24.9 cm wide, 31 cm deep
(6.96 in high, 8.7 in wide, 12.1 in deep).
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Oxygen Analyzer Appendix
A-2 Recommended 2-Year Spare Parts List
Qty. Part Number Description
1 C65507 Back Panel Board 1 C62371-B Front Panel Board 1 C71528 Preamplifier Board (Instruction) 1 C62365-A Main Computer Board 1 F10 Fuse, 2A, 250V 3AG Slow Blow 2 F1296 Fuse, 2A, 250V 5x20mm (European)
Slow Blow 1 CP1798 50 pin D-sub interface connector 50 CP1799 Pins for CP1798 connector 1 B597 125ml wash bottle for DI water 1 B598 125ml electrolyte bottle 1 P1076 Pipet 1 B72098 BDS sensor recovery kit
Note: Orders for replacement parts should include the part
number (if available) and the model and serial number of the instrument for which the parts are intended.
Orders should be sent to:
TELEDYNE Analytical Instruments
16830 Chestnut Street City of Industry, CA 91749-1580
Phone (626) 934-1500, Fax (626) 961-2538
Web: www. teledyne-ai. com or your l ocal r epresentative.
Teledyne Analytical Instruments 75
Appendix BDS 3000
A-3 Drawing List
D-71902 Outline Diagram
A-4 19-inch Relay Rack Panel Mount
Figure A-1: Single 19" Rack Mount (dimensions in mm)
Teledyne Analytical Instruments 76
Oxygen Analyzer Appendix
A-5 Application notes
Pressure and flow recommendations:
3000 series analyzers require reasonably regulated sample pressures. While the 3000 analyzers are not sensitive to variations of incoming pressure (provided they are properly vented to atmospheric pressure), the pressure must be maintained so as to provide a useable flow rate through the analyzer. Any line attached to sample vent should be 1/4" or larger in diameter.
Flow rate recommendations:
A usable flow rate for a 3000 series analyzer is one which can be measured on the flowmeter. This is basically 0.5 - 1.0 SLPM . The optimum flow rate is 1 SLPM (mid scale). Note: response time is dependent on flow rate, a low flow rate will result in slow response to O2 changes in the sample stream. The span flow rate should be the approximately same as the sample flow rate.
Cell pressure concerns:
The sensors used in 3000 series analyzers are optimized to function at atmospheric pressure.
Bypass:
To improve the system response, a bypass can be added to increase the sample flow rate to the analyzer by a factor of ten. A by­pass provides a sample flow path around the analyzer of 2 - 18 SCFH. typically.
Conversons:
1 PSI = 2.04 INCHES OF MERCURY (in. Hg.) 1 SCFH = 0.476 SLPM
Note: The MSDS on this material is available upon request
through the Teledyne Environmental, Health and Safety
Coordinator. Contact at (626) 934-1592
Teledyne Analytical Instruments 77
Appendix BDS 3000
Teledyne Analytical Instruments 78
MSDS Appendix
Material Safety Data Sheet
Section I - Product Identification
Product Name:
Manufacturer: Teledyne Electronic Technologies
Address: 16380 Chestnut Street,
Phone:
Technical Support: (626) 934-1673
Environment, Health and
Safety:
Date Prepared:
Micro-fuel Cells Mini-Micro-fuel Cells Super Cell, all classes except T-5F Electrochemical Oxygen Sensors, all classes
Analytical Instruments
City of Industry, CA 91749 (626) 961-9221
(626) 934-1592
11/23/98
Section II - Physical and Chemical Data
Chemical and Common
Names:
Potassium Hydroxide (KOH), 15% (w/v) Lead (Pb), pure
CAS Number:
Melting Point/Range:
Boiling Point/Range:
Specific Gravity:
pH:
Solubility in Water:
Percent Volatiles by Vol.:
Appearance and Odor:
Teledyne Analytical Instruments 79
KOH 1310-58-3 Pb 7439-92-1
KOH (15% w/v) Pb (pure)
-10 to 0 °C 328 °C 100 to 115 °C 1744 °C
1.09 @ 20 °C 11.34 >14 N/A Completely soluble Insoluble None N/A Colorless, odorless
solution
Grey metal, odorless
Appendix MSDS
Section III -Physical Hazards
Potential for fire and explosion: The electrolyte in the Micro-fuel Cells is not flammable. There are no fire or explosion hazards associated with Micro-fuel Cells.
Potential for reactivity: The sensors are stable under normal conditions of use. Avoid contact between the sensor electrolyte and strong acids.
Section IV - Health Hazard Data
Primary route of entry:
Exposure limits: OSHA PEL:
ACGIH TLV:
Effects of overexposure
Ingestion: The electrolyte could be harmful or fatal if
Eye: The electrolyte is corrosive; eye contact could
Dermal: The electrolyte is corrosive; skin contact could
Inhalation: Liquid inhalation is unlikely.
Signs/symptoms of exposure:
Medical conditions
aggravated by exposure: None
Ingestion, eye/skin contact
0.05 mg./cu.m. (Pb) 2 mg/ cu.m. (KOH)
swallowed. Oral LD50 (RAT) = 3650 mg/kg
result in permanent loss of vision.
result in a chemical burn.
Contact with skin or eyes will cause a burning sensation and/or feel soapy or slippery to touch.
Carcinogenicity:
Other health hazards: Lead is listed as a chemical known to the State
NTP Annual Report on Carcinogens: Not listed LARC Monographs: Not listed OSHA: Not listed
of California to cause birth defects or other reproductive harm.
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MSDS Appendix
Section V - Emergency and First Aid Procedures
Eye Contact: Flush eyes with water for at least 15 minutes
and get immediate medical attention.
Skin Contact: Wash affected area with plenty of water and
remove contaminated clothing. If burning persists, seek medical attention.
Ingestion:
Give plenty of cold water. Do not induce vomiting. Seek medical attention. Do not administer liquids to an unconscious person.
Inhalation: Liquid inhalation is unlikely.
Section VI - Handling Information
NOTE: The o xy g en s e ns or s a re s e aled , a nd u n de r no r ma l c ir cu ms tan ce s , th e
c on te nts o f the s en s or s d o no t p re se n t a he a lth h az ar d. Th e follo win g infor ma tio n is give n a s a g uide in th e ev en t tha t a c ell lea k s.
Protective clothing:
Clean-up procedures: Wipe down the area several times with a wet
Protective measures
during cell replacement:
Disposal: Should be in accordance with all applicable
NOTE: The above information is derived from the MSDS provided by the
manufacturer. The information is believed to be correct but does not purport to be all inclusive and shall be used only as a guide. Teledyne Analytical Instruments shall not be held liable for any damage resulting from handling or from contact with the above product.
Rubber gloves, chemical splash goggles.
paper towel. Use a fresh towel each time. Before opening the bag containing the sensor
cell, check the sensor cell for leakage. If the sensor cell leaks, do not open the bag. If there is liquid around the cell while in the instrument, put on gloves and eye protection before removing the cell.
state, local and federal regulations.
Teledyne Analytical Instruments 81
Appendix MSDS
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Oxygen Analyzer Index
Index
abort entry, 34 acces s d oo r, 4, 20 accuracy, 74 adding electrolyte, 29 adding water, 66 address, 75. See company address Ag/Ag
O electrode, 8
2
air saturation, 11 alarm, 55, 73
concentration, 2, 6, 38 configuration, 55 failure, 2, 55 high, 24 hysterisis, 57 low, 24 relay, 24, 55 relay contact pins, 25 resetting, 57 system, 25
threshold, 25 ALARM button, 56 alarm setpoint, 34
Alarms, 34 ALARMS, 3
amplifier saturation, 45 analog to digital converter, 15
ANALYZE, 2 Analyze button, 34
analyze function, 59 applications, 1 arrow key, 3 AtoD_Ave, 46 auto cal, 38 auto zero mode, 50 Auto-Cal, 36 automatic span mode, 52 autoranging, 2, 57 available characters, 42 b ackg ro u nd g as, 12 BDS sensor, 7, 30, 73
acid gas exposure, 13
advantage of, 8
cross section, 9
current, 15 damage, 22 filling, 28 maintenance, 13 output, 10, 11, 12, 22 stability, 13
BDS s en s or o u tp ut
output correction, 12 bipotentiostat. See BDS sensor block diagram, 15, 17 bypass, 22, 77 calibration, 49
contact, 26
relay contact, 26
remote control, 25 calibration contact, 6 calibration gas
connection, 14 carbon. See reticulated vitreous carbon caution sign, iv cir cu it bo ar d , 4 cleaning, 70 clock
internal, 6 combustible gas warning, xii company address. See company
address configuring the analyzer, 33 control panel, 20 controls
operator, 20 copyright, ii counter electrode, 7 current
background, 8
signal, 8 current to voltage amplifier, 15 damage, 19 data entry keys, 3, 34 default, 44, 57 default password, 36, 40 default values, 33 defeated (relay out), 24
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Index BDS 3000
de-ionized water, 65 delay, 37, 38 detection limit, 8 diffusion barrier, 8, 9 digital input
span, 26
zero, 25 digital to analog converter, 15 dimensions, 74, 76 d is play , 15, 73
frozen, 46 dissolved oxygen, 9 door. See access door door clearance, 20 drawer, 2 drawings, 76 drift, 14 electrochemical cell, 7 electrochemical device, 7 electrochemical reaction, 8 electrode, 7 electrolyte, 8, 9, 13, 19, 22, 28, 66 electrolyte level, 13 electronic block diagram. See block
diagram electronic component location, 16 electronics, 7 ENTER, 4, 34 equipment interface connector, 23 ESCAPE, 4, 34 estimating temperature coefficient, 49 exhaust, 22 extended analog function, 47 failsafe, 24 failure codes, 68 FCAL, 54 FCalib_factor, 46 features, 1 feedback control loop, 8 FET, 28 Filter, 37 filter function, 44 fixed range, 57. See range flow diagram, 14 flow restriction device. See restrictor flowmeter, 4, 14
calibration, 12 flowrate, 10, 22, 77 form C relay contacts, 24 front panel, 2, 20
frozen display. See display function key, 2 fuse, 67 fuse block, 22 fuse installation, 23 gas correction factor. See gas factor g as f actor , 12, 37, 45 gas inlet, 5, 9 gas outlet, 5, 9 GasBkgn, 37 GasBkgnd, 45 hierarchy of functions, 35 HOLD, 38 inlet, 14, 21 input
digital, 6, 25 inp ut/o u tp ut, 15 installation, 19 KOH, 8, 13, 28 latch , 4, 20 latching, 24 LED, 4 log out, 36 logout function, 43 Ltch, 57 maintenance, 65 manual span mode, 52, 53 manual zero mode, 51 manuals, additional, v maximum working range, 31 membrane switches, 2 meter, 4 m icro co n tr oller , 15 microprocessor, 2, 7 model information, iii More, 36 motherboard, 15 m ou ntin g , 19 moving contact, 25 MSDS, 79 Neg, 37, 45 negative display, 45 negative reading, 14 network I/O, 6, 27 nonfailsafe, 24 nonlatching, 24 normally closed, 24, 25 normally open, 24, 25
-
OH
, 9
Teledyne Analytical Instruments 84
Oxygen Analyzer Index
operational amplifier, 7 operational theory, 7 operator interface, 4 outlet, 14, 22 output, 10, 23
analog, 2, 5, 38, 59, 74 connections, 24 current, 23 linear, 60 range, 2 range ID, 23, 60
voltage, 23 output signal pins, 23 override, 2 oxygen intrusion, 30 oxygen level, 8 o xy gen s tand ard , 12 panel mount, 2 password, 36, 39 P C bo ar d , 15 platinum wire, 8 polarization, 8 potential reference, 10 potentiostat, 9 power, 5, 15 power cord, 22 power supply, 74 power-up sequence, 62 pressure, 11, 22, 77
excessive, 11 pressure regulator. See regulator PSWD, 36 purge, 50 purge-down, 11 rack mount, 2, 76 rack-mounting, 19 RAM, 2, 15 range, 73
default, 57
fixed, 58
HI, 58
LO, 58
MED, 58
setting, 34
setting, 58
Range, 57 Range, 34 RANGE button, 58
range ID, 6, 15, 27, 38 rear panel, 5, 21, 69
recovery time, 11 reduction equation, 8 reference electrode, 7, 10 refilling the sensor, 29 regulator, 22 remote calibration connection, 26 remote calibration protocol, 26 remote probe, 6, 28 remote valve connection, 28 response time, 22, 37, 44, 73 restrictor, 11 reticulated vitreous carbon, 9 RFI, 2 ROM, 2, 15 RS-232, 2, 6, 74 safety information, iv sample flow. See flowrate sample system, 7, 11, 14 scrubber, 50 second stage amplifier, 15 selecting options, 34 self diagnostic test, 2 self-diagnostic test, 30, 43, 67 self-protection mode, 30 Self–Test, 36 sensing electrode, 9 sensor
output, 10
temperature, 47 sensor calibration, 37 sensor shutdown function, 46 serial number, iii signal, 8 signal output
concentration, 15 signal processing, 7, 15 slope, 51, 54 software version, 37 solenoid valve
external, 6
Span, 34 SPAN, 3 SPAN, 52
span calibration, 52, 53
failure, 54 span gas
concentration, 49
maximum value, 53 span sequence, 63 spare parts listing, 75
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Index BDS 3000
specifications, 73 standby button, 25 startup. See self diagnostic test STNDBY, 4 subsystem, 7 swagelock fitting, 14
SYSTEM, 3 System functions, 36
system shut down mode, 30 Teledyne address, 75
TempComp, 37, 48 Temperature, 37
temperature coefficient, 11, 37, 48 testing the system, 30 threshold alarm. See alarm TRACK, 38 tracking readings, 37
TRAK/HLD, 37 Trbsht, 37
troubleshooting, 70 ultra trace, 30 universal power source, 5 u nivers al po w er s up p ly , 15, 22, 74 vacuum degas kit, 71
vacuum fluorescent display, 1 VCR fitting, 14, 21 vent, 11 verification screen, 41 Version, 37, 44 VFD, 4 warning sign, iv warranty, ii water addition, 13 web address, 10, 75 website address, v working electrode, 7, 9
Xout, 37 Zero, 34 ZERO, 3, 51 ZERO, 50
zero calibration, 50
automatic mode, 50
manual mode, 50 zero function mode, 50 zero gas, 50 zero offset, 50 zero sequence, 64
Teledyne Analytical Instruments 86
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