Rosemount Analytical
M
ODEL
NO/NO
I
NSTRUCTION MANUAL
951A
X ANALYZER
556383-Y
OTICE
N
The information contained in this document is subject to change without notice.
Teflon® is a registered trademark of E.I. duPont de Nemours and Co., Inc.
Manual Part Number 556383-Y
July 2000
Printed in U.S.A.
Rosemount Analytical Inc.
4125 East La Palma Avenue
Anaheim, California 92807-1802
C
ONTENTS
P
REFACE
SAFETY SUMMARY ..........................................................................................P-1
SPECIFICATIONS..............................................................................................P-3
CUSTOMER SERVICE, TECHNICAL ASSISTANCE AND FIELD SERVICE....P-4
RETURNING PARTS TO THE FACTORY.........................................................P-4
TRAINING ......................................................................................................P-4
DOCUMENTATION............................................................................................P-4
COMPLIANCES .................................................................................................P-5
S
ECTION
1.1 OVERVIEW..............................................................................................1-1
1.2 OPTIONS .................................................................................................1-2
S
ECTION
2.1 FACILITY PREPARATION........................................................................2-1
2.2 UNPACKING.............................................................................................2-1
2.3 GAS REQUIREMENTS.............................................................................2-5
2.4 SAMPLE REQUIREMENTS......................................................................2-6
2.5 GAS CONNECTIONS................................................................................2-7
2.6 ELECTRICAL CONNECTIONS.................................................................2-7
1. I
NTRODUCTION
2. I
NSTALLATION
2.1.1 Outline and Mounting Dimensions..............................................2-1
2.1.2 Location......................................................................................2-1
2.1.3 Power Requirements...................................................................2-1
2.6.1 Recorder Output..........................................................................2-7
2.6.2 Thermocouple Connections for Measuring Temperature of
NO2 to NO Converter....................................................2-7
2.6.3 Remote Range Change ..............................................................2-7
2.6.4 Connections of Range I.D. Kit.....................................................2-9
2.6.5 Power Connections.....................................................................2-9
556383-Y Rosemount Analytical July 2000
Model 951A NO/NOx Analyzer
i
ONTENTS
C
SECTION 3. STARTUP
3.1 STARTUP PROCEDURE......................................................................... 3-1
3.2 CALIBRATION......................................................................................... 3-3
3.3 MEASUREING EFFICIENCY OF NO2 TO NO CONVERTER AND
ADJUSTING TEMPERATURE SETPOINT .................................. 3-4
3.3.1 Test Setup for Measurement of Conversion Efficiency............... 3-4
3.3.2 Test Procedure........................................................................... 3-5
3.3.3 Subnormal Conversion Efficiency............................................... 3-9
3.3.4 Replacement of Converter.......................................................... 3-9
3.3.5 Capillaries................................................................................... 3-9
3.3.6 TEA Scrubber............................................................................. 3-9
SECTION 4. OPERATION
4.1 ROUTINE OPERATION............................................................................ 4-1
4.2 RECOMMENDED CALIBRATION FREQUENCY..................................... 4-1
SECTION 5. THEORY
5.1 PRINCIPLES OF OPERATION................................................................. 5-1
5.1.1 Nitric Oxide Determination by Chemiluminescence Method........ 5-1
5.1.2 NOx Determination...................................................................... 5-1
5.1.3 Ozone Generation....................................................................... 5-2
5.2 ANALYZER FLOW SYSTEM................................................................... 5-2
5.2.1 Flow of Sample or Standard Gas to Reaction Chamber.............. 5-2
5.2.2 Flow of Air or Oxygen.................................................................. 5-3
5.2.3 Flow System Operating Modes ................................................... 5-4
5.2.4 Converter Bleed Flow.................................................................. 5-5
5.3 ELECTRONIC CIRCUITRY...................................................................... 5-5
5.3.1 Amplifier Board and Associated Circuitry ................................... 5-6
5.3.2 Valve Control Board, Front Panel Mode Switch and
Associated Circuitry...................................................... 5-7
5.3.3 ±15 Volt Power Supply.............................................................. 5-8
5.3.4 High Voltage Power Supply........................................................ 5-8
5.3.5 Converter Temperature Control Board and Associated
Elements....................................................................... 5-9
5.3.6 Fan Control Circuit......................................................................5-10
5.3.7 Remote Operation Option........................................................... 5-10
5.3.8 Range I.D. Option....................................................................... 5-10
ii
July 2000 Rosemount Analytical 556383-YModel 951A NO/NOx Analyzer
SECTION 6. SERVICE AND MAINTENANCE
6.1 SYSTEM CHECKS AND ADJUSTMENTS................................................6-1
6.2 SERVICING FLOW SYSTEM....................................................................6-6
6.2.1 Sample Capillary..........................................................................6-6
6.2.2 Ozone Restrictor and Capillary....................................................6-7
6.2.3 Replacing NO2 to NO Converter..................................................6-8
6.2.4 Cleaning Reaction Chamber........................................................6-10
6.2.5 Photomultiplier Tube and Housing...............................................6-12
6.2.6 Teflon Liner in Lamp Housing of Ozone Generator.....................6-13
6.3 SERVICING ELECTRONIC CIRCUITRY ..................................................6-14
SECTION 7. REPLACEMENT PARTS
ONTENTS
C
7.1 CIRCUIT BOARD REPLACEMENT POLICY.............................................7-1
7.2 REPLACEMENT PARTS...........................................................................7-1
7.2.1 Pneumatics.................................................................................7-6
7.2.2 Converter Assembly....................................................................7-7
7.2.3 Low Tempco Option ....................................................................7-9
ENERAL PRECAUTIONS FOR HANDLING
G
ARRANTY
W
IELD SERVICE AND REPAIR FACILITIES
F
TORING HIGH PRESSURE CYLINDERS
& S
556383-Y Rosemount Analytical July 2000
Model 951A NO/NOx Analyzer
iii
ONTENTS
C
F
IGURES
1-1 Model 951A NO/NOx Analyzer.................................................................... 1-1
2-1 Model 951A Outline and Mounting Dimensions .......................................... 2-2
2-2 Front Panel Indicators and Controls............................................................ 2-3
2-3 Controls and Adjustments Located Behind Swing-Out Front Panel............ 2-3
2-4 Rear Panel.................................................................................................. 2-3
2-5 Remote Range Kit Installed......................................................................... 2-8
2-6 Typical Interconnection of Remote Range Kit............................................. 2-8
3-1 Amplifier Board Adjustments....................................................................... 3-4
3-2 Measuring Efficiency of NO2 to NO Converter............................................ 3-7
3-3 Conversion Efficiency as a Function of Converter Temperature................. 3-8
5-1 Schematic Flow Diagram of Model 951A.................................................... 5-2
5-2 Functional Schematic Diagram of Electronic Signal Circuitry...................... 5-5
6-1 Amplifier Board............................................................................................ 6-3
6-2 NO2 to NO Converter Assembly.................................................................6-9
6-3 Reaction Chamber/Photomultiplier Assembly............................................. 6-10
6-4 Reaction Chamber Assembly and Phototube Housing ............................... 6-11
6-5 Ozone Generator........................................................................................6-13
6-6 Terminal Chassis Wiring Diagram............................................................... 6-15
7-1A Model 951A................................................................................................. 7-2
7-1B Model 951A................................................................................................. 7-3
7-1C Model 951A................................................................................................ 7-4
7-2 Electronics................................................................................................... 7-5
7-3 Front Panel Pneumatics Components......................................................... 7-6
7-4 Converter Components............................................................................... 7-7
7-5 Ozone Generator Components................................................................... 7-8
7-6 Tempco Reftrofit Component Location........................................................ 7-9
T
ABLES
iv
2-1 Model 951A Controls and Adjustments.................................................... 2-4
3-1 Proper Gas Supply Pressures for Various Levels of Sample NOx........... 3-3
July 2000 Rosemount Analytical 556383-YModel 951A NO/NOx Analyzer
DRAWINGS (LOCATED IN REAR OF MANUAL)
619604 Schematic Diagram, Computer Interface
619710 Schematic Diagram, ±15V Power Supply
641871 Schematic Diagram, Temp Control
649819 Schematic Diagram, Amplifier Board
649822 Diagram, Tubing - Model 95A
649834 Schematic Diagram, 951A NO/NOx Analyzer
649835 Pictorial Wiring Diagram, Model 951A NO/NOx Analyzer
649958 Flow Diagram, Model 951A
652423 Schematic Diagram, Power Supply
652834 Schematic Diagram, Power Supply - Thermocooler
652838 Pictorial Wiring Diagram, Low Tempco Option
654348 Schematic Diagram, Hi Voltage Board Assembly
656313 Schematic Diagram, Valve Control Board
780350 Schematic Diagram, 4-20mA 0-5V Option
780726 Wiring Diagram, 4-20mA 0-5V Option
780727 Installation Drawing, Model 951A w/4-20mA 0-5V Option
780809 Wiring Diagram, 4-20mA 0-5V Option and Low Tempco
ONTENTS
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556383-Y Rosemount Analytical July 2000
Model 951A NO/NOx Analyzer
v
ONTENTS
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N
OTES
vi
July 2000 Rosemount Analytical 556383-YModel 951A NO/NOx Analyzer
P
REFACE
S
AFETY SUMMARY
To avoid explosion, loss of life, personal injury and damage to this equipment and on-site
property, all personnel authorized to install, operate and service the Model 955A should
be thoroughly familiar with and str ictly follow the instructions in this manual. Save these
instructions.
If this equipment is used in a manner not specified in these instructions, protective
systems may be impaired.
DANGER is used to indicate the presence of a hazard which will cause severe
personal injury, death, or substantial property damage if the warning is ignored.
WARNING is used to indicate the presence of a hazard which can cause severe
personal injury, death, or substantial property damage if the warning is ignored.
CAUTION is used to indicate the presence of a hazard which will or ca n cause minor
personal injury or property damage if the warning is ignored.
NOTE is used to indicate installation, operation or maintenance information which is
important but not hazard-related.
WARNING: ELECTRICAL SHOCK HAZARD
Do not operate without doors and covers secure. Servicing requires access to
live parts which can cause death or serious injury. Refer servicing to qualified
personnel.
For safety and proper performance this instrument must be connected to a
properly grounded three-wire source of power.
556383-Y Rosemount Analytical July 2000
Model 951A NO/NOx Analyzer
P1
REFACE
P
WARNING: ULTRA VIOLET LIGHT HAZARD
UV light from the ozone generator can cause permanent eye damage. DO NOT
LOOK DIRECTLY AT THE UV SOURCE IN THE OZONE GENERATOR. Use of UV
filtering glasses is recommended.
WARNING: OZONE HAZARD
This instrument generates ozone while operating. Ozone is toxic by inhalation
and is a strong irritant to the throat and lungs. Ozone is also a strong oxidizing
agent. Its presence is detected by a characteristic pungent odor.
The instrument EXHAUST outlet contains ozone and nitrogen dioxide which is
toxic by inhalation. The BYPASS outlet contains various oxides of nitrogen, and
if the sample source is from the exhaust of an internal combustion engine, it
may contain unburned hydrocarbons and carbon monoxide which is highly toxic
and, depending on duration of exposure, can cause headache, nausea, loss of
consciousness and death.
Avoid any inhalation of the internally generated ozone, sample, EXHAUST and
BYPASS discharge. Keep all tubing fittings checked for tightness to avoid
internal leaks.
Connect rear panel EXHAUST and BYPASS outlets to outside vent via se parate
lines 1/4 inch (6.3mm) or larger. Use only Teflon or stainless steel tubing.
WARNING: PARTS INTEGRITY
Tampering or unauthorized substitution of components may adversely affect
safety of this product. Use only factory documented components for repair.
CAUTION: AIR FLOW
Do not operate instrument without air flow to the ozonator; plugging of the filter
will result.
CAUTION: HIGH PRESSURE GAS CYLINDERS
P2
This instrument requires use of oxygen and a known standard gas in high
pressure cylinders. Refer to Handling and Storing High Pressure Gas Cylinders
located in the rear of this manual.
July 2000 Rosemount Analytical 556383-YModel 951A NO/NOx Analyzer
SPECIFICATIONS
REFACE
P
C
ATALOG NUMBER
R
ANGES
SENSITIVITY
L
INEARITY
R
ESPONSE TIME
S
TANDARD SAMPLE
C
APILLARY
A
UXILIARY SAMPLE
C
APILLARY
P
RECISION
S
TABILITY
Z
ERO
193702 Model 951A NO/NOx Analyzer
Selectable fullscale range of 10, 25, 100, 250, 1000, 2500 and
10,000 parts per million
0.1 ppm on 10 ppm range
±1% of fullscale
The specified linearity is obtainable throughout the operating
range, contingent upon use of an appropriate combination of
oxygen source gas, gas pressure settings and electronic
adjustments.
(E
LECTRONIC PLUS FLOW
Approximately one second on all ranges except 10 ppm.
Approximately three seconds on 10 ppm range.
Five seconds on all ranges.
For such applications as monitoring stack sources, where
comparatively slow response is desired, an internal switch
provides an optional electronic response time of approximately
10 seconds to 90% of fullscale on all ranges.
±5% of fullscale
1% of fullscale in 24 hours
)
S
PAN
D
ETECTOR OPERATING
T
EMPERATURE
R
ECORDER OUTPUT
A
MBIENT TEMPERATURE
E
LECTRICAL POWER
R
EQUIREMENTS
D
IMENSIONS
W
EIGHT
1% of fullscale in 24 hours
Atmospheric
Selectable output of 10 millivolts, 100 millivolts, 1 volt or 5 volts
40°F to 100°F (4.4°C to 37.7°C)
107 to 127 VAC, 50/60 Hz, 1000 watts
9.0 x 17.8 x 22.0 inches (228.6 x 450.9 x 558.8mm) HxWxD
76 lbs (34.5 kg)
556383-Y Rosemount Analytical July 2000
Model 951A NO/NOx Analyzer
P3
REFACE
P
C
USTOMER SERVICE
For order administration, replacement Parts, application assistance, on-site or factory
repair, service or maintenance contract information, contact:
, T
ECHNICAL ASSIST ANCE AND FIELD SERVICE
Rosemount Analytical Inc.
Process Analytical Division
Customer Service Center
1-800-433-6076
RETURNING PARTS TO THE FACTORY
Before returning parts, contact the Customer Service Center and request a Returned
Materials Authorization (RMA) number. Please have the following information when
you call: Model Number, Serial Number, and Purchase Order Number or Sales Order
Number.
Prior authorization by the factory must be obtained before returned materials will be
accepted. Unauthorized returns will be returned to the sender, freight collect.
When returnin g any pro duct o r compon ent t hat has be en expo sed to a toxic, corrosi ve
or other hazardous material or used in such a hazardous environment, the user must
attach an appropriate Material Safety Data Sheet (M.S.D.S.) or a written certification
that the material has been decontaminated, disinfected and/or detoxified.
Return to:
Rosemount Analytical Inc.
4125 East La Palma Avenue
Anaheim, California 92807-1802
USA
T
RAINING
A comprehensive Factory Training Program of operator and service classes is
available. For a copy of the Current Operator and Service Training Schedule contact
the Technical Services Depart men t at:
Rosemount Analytical Inc.
Phone: 714-986-7600
FAX: 714-577-8006
D
OCUMENTATION
The following Model 951A NO/NOx Analyzer instruction materials are available.
Contact Customer Service or the local representative to order.
556383 Instruction Manual (this document)
P4
July 2000 Rosemount Analytical 556383-YModel 951A NO/NOx Analyzer
C
OMPLIANCES
This product may carry approvals from several certifying agencies, for use in nonhazardous, indoor locations
97-C218
REFACE
P
556383-Y Rosemount Analytical July 2000
Model 951A NO/NOx Analyzer
P5
REFACE
P
N
OTES
P6
July 2000 Rosemount Analytical 556383-YModel 951A NO/NOx Analyzer
I
NTRODUCTION
1
1.1 OVERVIEW
The Model 951A NO/NOx Analyzer continuously analyzes a flowing gas sample
performing one of two switch selectable determinations:
1. Nitric oxide (NO); or
2. Combined nitric oxide (NO) and nitrogen dioxide (NO,) designated NOx. By
definition [NOx] = [NO] + [NO2].
Typical applications include analyzing vehicular exhaust emissions from internal
combustion engines and monitoring the effluent from stationary (stack) sources
The analyzer utilizes the chemiluminescent method of detection In the nitric oxide
determination, sample NO is quantitatively converted into NO2 by gas-phase oxidation
with molecular ozone produced within the analyzer from air or oxygen supplied by an
external cylinder. A characteristic of this reaction is the elevation of approximately
10% of the NO2 molecules to an electronically-excited state, followed by immediate
reversion to the non-excited state accompanied by emission of photons.
The emitted photons impinge on a photomultiplier detector generating a low-level DC
current. The current is amplified to drive a front panel meter and an accessory
potentiometric recorder if desired.
SPAN
ZERO
PPM RANGE
250 1000
100 2500
25 10000
10 AUTO
NALYZER
CONVERTER
ADJUST
Model 951A N O /NO x A nalyzer
IGURE
F
1-1. M
ON
NO NOx
OFF
Rosemount Analytical
ODEL
951A NO/NOX A
MODE
556383-Y Rosemount Analytical July 2000
Model 951A NO/NOx Analyzer
1-1
NTRODUCTION
I
To minimize noise and reduce dark current, the photomultiplier tube is mounted in a
thermoelectrically-cooled housing with temperature held constant at about 59oF
(15oC). Control circuitry is contained in the 652831 Cooler Temperature
Controller/Power Supply Assembly. The power supply circuit provides a high-current
source of DC voltage. A thermistor sensor attached to the housing, and an associated
switching transistor, control a pass transistor, providing closely regulated on-off
control.
Attached to the cooler housing is thermal fuse F3, setpoint 150oF (65oC). This fuse
protects the thermoelectric cooler against the overheating that otherwise could occur
as a result of excessively high ambient temperature or failure of a fan.
CAUTION: EXCESSIVE HEAT
Do not operate this analyzer without the air duct covering the cooling fins of the
thermoelectric cooler. Excessive heat may damage the cooling devices. The
cooler indicator lamp DS1 (mounted on the upper left side of the inner flow
regulator panel and can be viewed through the window) will cycle on and off
until a control point is reached.
Analyzer functioning for the NOx determination is identical to that described above for
the NO determination except that, before entry into the reaction chamber, the sample
is routed through a converter where the NO2 component is dissociated to form NO.
Instrument response is proportional to total NO in the converted sample, that is the
sum of the NO present in the original sample plus the NO produced by dissociation of
NO2.
To minimize system response time an internal sample-bypass feature provides
high-velocity sample flow through the analyzer.
The electronic circuitry is modularized, utilizing plug-in p rinted circuit boards with solid
state components and test jacks for easy troubleshooting and replacement.
If desired, the Model 951A may be factory equipped with various optional features in
addition to the standard features of the basic instrument. Brief descriptions of the
principal options are given in the following section.
1.2 OPTIONS
ANGE
R
I.D.
1-2
This option provides contact closure signals that enable a computer or other external
device to identify the setting of the front panel PPM RANGE Switch. The Model 7D
Thermal Conductivity Analyzer is designed to continuously measure the concentration
July 2000 Rosemount Analytical 556383-YModel 951A NO/NOx Analyzer
NTRODUCTION
I
of a single component of interest in a flowing gas mixture. The measurement is based
on the different thermal conductivity's of the individual components of the sample
stream. The method is especially well suited to analysis of two-component sample
streams. However, analysis of multi-component streams is possible if the various
components of the background gas occur in relatively constant ratio, or have similar
thermal conductivity's.
EMOTE RANGE CHANGE
R
For applications where remote operation of the analyzer is desired, as in an emission
test console, the Remote Range Change Option may be used. This option permits
either the operator or a computer to override and disable the front panel MODE and
PPM RANGE Switches and thus to control selection of: (a) NO or NOx mode, and (b)
parts-per-million range.
The unit consists of an electrical plug connector with plug-in logic card and harness for
connection to a rear panel terminal strip on the analyzer.
ANGE
R
AND REMOTE RANGE CHANGE
I.D.
The Range I.D./Remote Range Change Option is a combination of the Range I.D. and
Remote Range Change options. This option is compatible with a user supplied remote
control system employing a 24 VDC digital output and input for analyzer range control
and analyzer range sense, respectively. It is completely integral within the analyzer
and provides a terminal strip on the rear of the analyzer for connections of the user
cable.
AMPLE PUMP
S
The basic Model 951A is designed to accept pressurized samples. To permit analysis
of gases at atmospheric or sub-atmospheric pressure the analyzer may be equipped
with an optional, internally mounted sample pump. This option is not available on Low
Tempco versions of the 951A. An external, accessory pump can be ordered instead.
556383-Y Rosemount Analytical July 2000
Model 951A NO/NOx Analyzer
1-3
NTRODUCTION
I
N
OTES
1-4
July 2000 Rosemount Analytical 556383-YModel 951A NO/NOx Analyzer
I
NSTALLATION
2
2.1 FACILITY PREPARATION
Sections 2.1.1 through 2.1.3 provide information that may be required prior to
installation of the analyzer.
2.1.1 O
2.1.2 L
2.1.3 P
UTLINE AND MOUNTING DIMENSIONS
Significant dimensions are shown in Figure 2-1.
OCATION
Install analyzer in a clean area, not subject to excessive vibration or extreme
temperature variations .
Preferably, the analyzer should be mounted near the sample stream, to minimize
sample transport time. A circuit controlled by a thermal switch holds internal
temperature of the analyzer to the correct operating temperature for ambient
temperatures in the range 40oF to 100oF (4.4oC to 37.7oC). Temperatures outside
these limits necessitate use of special temperature controlling equipment or
environmental protection.
Preferably, the cylinders of air (or oxygen) and span gas should be located in an area
of relatively constant ambient temperature.
OWER REQUIREMENTS
Electrical power requirements are 107 to 127 VAC, 50/60 Hz, 1000 watts.
2.2 UNPACKING
Unpack instrument carefully. Preparatory to shipment, the photomultiplier tube housing
and the sample pump (if instrument is so equipped) are immobilized with hold down
screws, inserted from the bottom of the instrument and marked with red paint for
identification. The hold down screws must be removed prior to operation of the
instrument. In the event the instrument is ever returned to the factory, these screws
must be replaced to ensure safe shipment.
556383-Y Rosemount Analytical July 2000
Model 951A NO/NOx Analyzer
2-1
NSTALLATION
[
]
[
]
I
19.0
[482]
8.7
[222]
8.7
[221]
7.0
[178]
1.25
[32]
9.0
[228]
4.5
114
2.0
[51]
6.0
[152]
20.2
[513]
18.3
[465]
1.0
[25.4]
1.25
[32]
6.6
168
4.6
[118]
2.8
[70]
DIMENSIONS
Inch
mm
3. ALLOW 16 INCHES IN FRONT OF
INSTRUMENT FOR DOOR SWING.
2. ALLOW 12 INCHES MINIMUM CLEARANCE
ABOVE INSTRUMENT FOR MAINTENANCE..
1. RECOMMENDED MOUNTING HARDWARD:
10-32 MACHINE SCREWS (SUPPLIED BY
CUSTOMER).
IGURE
F
2-1. M
ODEL
951A O
2-2
18.3
[465]
18.3
[465]
18.3
[465]
18.3
[465]
RECOMMENDED PANEL CUTO UT
UTLINE AND MOUNTING DIMENSIONS
July 2000 Rosemount Analytical 556383-YModel 951A NO/NOx Analyzer
8.5
[216]
∅.25
[63]
6 PLC'S
NSTALLATION
A
C
U
I
AC POWER
ON/OFF
SWITCH
IGURE
F
2-2. F
PHOTOMULTIPLIER
HIGH VOLTAGE
INTERLOCK SWITCH
RECORDER OUTPUT
SELECT SWITCH
ON
SPAN
ADJUST
250
100
25
10
1000
2500
10000
AUTO
ZERO
ADJUST
SAMPLE PRESSUR E
GAUGE
B
Y
P
A
FLOW
S
BALANCE
S
Rosemount Analytical
MODE
SWITCH
PPM RANGE
SWITCH
CONVERTER
ADJUST
CONVERTER
INDICATOR
RONT PANEL INDICATORS AND CONTROLS
RESPONSE TIME
SELECTOR SWITCH
10
5
FAST SLOW
100
1
RESPONSE
MV
V
REC
OUTPUT
R22
R34
ALIB
R16
R33
R31
R6
INP
T
R32
BYPASS NEEDLE VALVE
B
Y
P
A
FLOW
S
BALANCE
S
OZONE
OZONE
OZONE
OZONE
OZONE
PRESSURE
GAUGE
OFF
BYPASS
FLOWMETER
BYPASS
FLOWMETER
OZONE PRESSURE
REGULATOR
OZONE OFF
PUSHBUTTON
SWITCH
OFF
IGURE
F
2-3. C
THERMOCOUPLE
CONNECTOR TB9
IGURE
F
2-4. R
P
IR INLET
EXHAUST
Rosemount Analytical
FLOW BALANCE
NEEDLE VALVE
Model 951A NO/NOx Analyzer
SAMPLE BACKPRE SSURE
REGULATOR
ONTROLS AND ADJUSTMENTS LOCATED BEHIND SWING OUT FRONT
ANEL
SAMPLE INLET
RECORDER CONNECTION TB4-1
RECORDER CONNECTION TB4-2
RANGE I.D.
CONNECTOR J10
(Option)
CABLE GLAND FOR
RECORDER CABLE
AC POWER CABLE
FUSE F1 FUSE F2
EAR PANEL
556383-Y Rosemount Analytical July 2000
Model 951A NO/NOx Analyzer
2-3
NSTALLATION
I
CONTROL FUNCTION
ON/OFF
MODE S
WITCH
METER
PPM RANGE S
CONVERTER
ADJUST
ZERO
SPAN
SAMPLE
BACKPRESSURE
REGULATOR AND
PRESSURE GAUGE
BYPASS F
AND
N
OZONE
REGULATOR AND
GAUGE
OZONE OFF
LOWMETER
EEDLE VALVE
PRESSURE
SWITCH
WITCH
Controls AC power to all components in instrument
For selection of NO or NOx
Readout of NO or NOx in ppm as selected with MODE switch.
Upper scale is graduated 0 to 100 for use with 10, 100, 1000,
and 10,000 ppm ranges. Lower scale is graduated 0 to 25 for
use with 25 and 2500 ppm ranges.
Select fullscale range for meter and recor der
LED illuminates during application of power to converter
heater. When Converter reaches temperature equilibrium,
LED will go off and on at intervals of about 2 seconds,
indicating correct temperature control.
Through-panel screwdriver adjustment of converter
temperature. Should be set for temperature that yields
optimum combination of high efficiency for the NO2 to NO
conversion and extended life for the catalytic converter.
Optimum temperature differs from one instrument to another,
see Section 3.3.
Set zero point on meter scale or recorder chart. With MODE
switch in NO position and zero air supplied to SAMPLE inlet,
ZERO Control is adjusted for zero reading.
Set upscale calibration point on meter scale or recorder chart.
MODE switch is at NO or NOx and suitably pressurized
standard gas of accurately known NO/NOx content is supplied
to SAMPLE inlet. With PPM RANGE switch set to the
appropriate range for the span gas, the SPAN control is
adjusted to correct reading on meter or recorder.
Adjustment and indication of pressure (and therefore flow) of
sample or standard gas routed through sample capillary, and
into reaction chamber. Proper setting dependent on operating
range. See Table 3-1.
Bypass flow indication and adjustment for sample or standard
gas to SAMPLE inlet. Setting of 2 L/min. is recommended to
ensure rapid response and optimum functioning of sample
backpressure regulator
Pressure adjustment and indication for air or oxygen supplied
to AIR inlet for use as oxygen source for internal ozone
generator. Oxygen is usable for all ranges. Air is usable only
for 2500 ppm range or lower. Proper pressure setting
dependent on operating rang e, see Tabl e 3- 1.
Removes AC power to ultraviolet source lamp in ozone
generator. Power is OFF when switch indicator is red.
ABLE
T
2-4
2-1. M
PAGE
ODEL
)
951A C
ONTROLS AND ADJUSTMENTS (CONTINUED ON NEXT
July 2000 Rosemount Analytical 556383-YModel 951A NO/NOx Analyzer
CONTROL FUNCTION
FLOW BALANCE
NEEDLE VALVE
RESPONSE TIME
SELECTOR SWITCH
RECORDER OUTPUT
SELECTOR SWITCH
M
ETER MECHANICAL
ZERO
NSTALLATION
I
Use to equalize pressure drop for NO and NOx legs of the
internal flow system. Criterion for correct adjustment is an
NO2 free nitric oxide standard gas should give equal readings
of ppm for NO and NOx modes. An alternate flow balance
check , if NO2 free standard gas is unavailable, is to verify that
the reading on the SAMPLE pressure gauge is the same for
NO and NOx modes.
Select either FAST or SLOW electronic response. When set
to FAST, electronic response time (for 0 to 90% of fullscale) is
then approximately one second for all ranges except 10 ppm,
which is approximately three seconds. When set to SLOW (as
in monitoring stack sources), electronic response time 0 to
90% of fullscale) is approximately ten seconds for all ranges.
To select output of 10 mV, 100 mV, 1V or 5 V for a
potentiometric recorder.
Located on rear of meter. With AC power OFF, meter should
read zero. If not use screw adjustment on meter.
P
ABLE
T
HOTOMULTIPLIER HIGH
V
OLTAGE INTERLOCK
S
WITCH
2-1. (
CONTINUED FROM PREVIOUS PAGE
When analyzer front panel is open, photomultiplier high
voltage power supply is automatically shut off.
)
2.3 GAS REQUIREMENTS
WARNING: HIGH PRESSURE GAS CYLINDERS
This instrument requires use of oxygen and a known standard gas in high
pressure cylinders. Refer to Handling and Storing High Pressure Gas Cylinders
located in the rear of this manual.
IR OR OXYGEN
A
This is used as both (a) oxygen source for generation of the ozone required for the
chemiluminescent reaction, and (b) standard gas for zero calibration. Gas for both
purposes may be supplied from a single cylinder and routed through a tee.
Alternatively, two separate cylinders may be used.
Oxygen is usable in all applications. Air is suitable for the oxygen source only if the
desired fullscale operating range is 2500 parts-per-million or less. Breathing grade
oxygen or air is recommended. Clean, dried ambient air containing less than 0.1
parts-per-million nitric oxide may be used, provided that its de wpoint is below -10oF (23oC). If air is insufficiently dried, or contains excessive nitric oxide, instrument
response will not be linear to 2500 ppm.
556383-Y Rosemount Analytical July 2000
Model 951A NO/NOx Analyzer
2-5
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