DIOXOR®II
INSTRUCTION 19-9121
Portable SO2 Analyzer
Part No. 19-7038 & 19-7043
Rev. 5 - September 1997
Bacharach, Inc.
625 Alpha Drive, Pittsburgh, PA 15238
(412) 963-2157/2164 Fax: (412) 963-2640
Printed in U.S.A.
® Registered Trademarks
WARNING!
Because this instrument is used to detect and monitor materials and conditions which are listed by OSHA
or others as potentially hazardous to personnel and property, the information in this manual must be fully
understood and utilized to ensure that the instrument is operating properly and is both used and maintained
in the proper manner by qualified personnel. An instrument that is not properly calibrated, operated and
maintained by qualified personnel is likely to provide erroneous information, which could prevent user
awareness of a potentially hazardous situation for the instrument user, other personnel and property.
If, after reading the information in this manual, the user has questions regarding the operation, application
or maintenance of the instrument, supervisory or training assistance should be obtained before use.
Assistance is available by calling your nearest Bacharach Service Center.
1 INTRODUCTION
®
The Dioxor II is a commercial-grade
portable instrument designed to display
concentrationsofsulfurdioxide(SO2)gas
between0and2000 ppm. Thisinstrument
shows the presence of SO2 in a gas sample
bydrawingthesampleintoitssensorcham-
ber by a built-in motorized pump. Part
#19-7038 comes with a probe. Part #19-
7043 comes without a probe (All non-
proberelatedfunctionsremainthesamein
this instruction).
Other features and accessories of the
DioxorIIinclude:Alarge, back-litLiquid
Crystal Display (LCD), which allows the
displaytobereadinanylightingcondition
from direct sun-light to total darkness; a
semi-detachable elastic strap that permits
the instrument to be either hand held, or
hung on nearby objects; a rigid stainless
steel probe with handle, connected to a
flexiblehosewithsamplefilterthatallows
gassamplestobetakenfromcrampedand
confined areas (alternate probes and
Figure 1. Dioxor II
condensate traps may be used).
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2 TECHNICAL CHARACTERISTICS
SO2 Display Range ........... 0-1999 ppm SO2
Accuracy ........................... ±10 ppm or ±5% of reading
whichever is greater
Response Time ................. 90% of final value within 40 sec.
Battery Requirements ....... 1.5 V, “C” cells, Qty. 4
Operating Time* ............... 14-16 hours, alkaline cells
Operating Temp. Range .... 23 to 104°F (–5 to 40°C)
Relative Humidity ............. 10-85% non-condensing
Weight (w/o batteries) ...... 12 ozs. (341 grams)
Dimensions ....................... 8.6 x 3.5 x 2.9 inches (218 x 89 x 74 mm)
* Times are with the backlight turned off. Continuous use of the
backlight will decrease battery life.
3 PREPARING THE DIOXOR II
FOR OPERATION
To prepare the instrument for operation, you
must install four “C” size batteries, and (if
desired) install the hose and probe as described
in the following paragraphs.
For your convenience, and to ensure that the
instrument will provide reliable SO2 indica-
tions, the SO2 sensor is installed and the instru-
ment calibrated on a known SO2 concentration
at the factory.
3.1 Battery Installation
Detach the elastic strap's metal clip at the bot-
tom of the instrument, and slide off the battery
coverasshowninFigure 2. Thenwhileobserv-
ingproperbatterypolarity, installfour“C”size
batteriesintotheinstrument’sbatterycompart-
ment. (Recommended battery types: Duracell
Alkaline or equivalent). After the batteries are
installed, replace the battery cover and the
elastic-strap clip.
Figure 2. Battery
Installation
2
If batteries are accidently installed in the wrong polarity, a positive
temperaturecoefficient(PTC)thermistorwillprotecttheinstrument’s
electronic circuity. The instrument will operate once batteries are
properly installed and the PTC thermistor is allowed to cool.
3.2 Probe Installation
The probe comes disassembled. To add the probe tip:
a. Loosen but DO NOT REMOVE the Knurled Nut (03-2023) on
the main part of the Probe Assembly (19-3076).
b. Insert probe tube into Extended Adapter Block (19-3072).
c. Hand tighten the Knurled Nut (03-2023) then add 1/4 turn to
snug probe to the rest of the probe assembly.
NOTE: In order to prevent the possibility of misplacing the
Front (03-2024) and Back (03-2025) Ferrules, loosen but
DO NOT REMOVE the Knurled Nut (03-2023) before
inserting or removing the Probe Tube (19-3073).
Install the probe by sliding the end of its tubing over the gas inlet port
onthetoprightsideoftheinstrumentasshowninFigure 3. Thetubing
may be difficult to slide over the gas inlet port of the unit for the first
time.Thiswasdoneintentionallytoallowforasnugfit.Usealittledish
washing liquid diluted in water or heat the end of the tube in hot tap
water to help it slide onto the port.
Figure 3. Probe Installation
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4 OPERATION
To operate the Dioxor II, you simply . . .
• Set its POWER switch to ON,
• Wait for the instrument to warm up (approx. 1 minute),
• Zero the display (if necessary),
• Take a gas sample.
Detailed operating procedures are presented below:
4.1 Power ON/OFF
Turn on the instrument by sliding its POWER
switch to ON. Observe that when power is first
applied, all numerical LCD segments are tested for
5-15 seconds; after which, the LCD shows the detected SO2 level. (A
minus sign may appear during power up as the sensor stabilizes.) Turn
off the instrument by sliding the POWER switch to OFF.
Important!Whenstoringtheinstrumentforextendedperiodsoftime,
remove the batteries and ensure that the POWER switch is OFF. The
OFF position places a short across the SO2 sensor, thus keeping the
sensor from being destabilized while not in use.
4.2 Zeroing the Instrument
After being turned on and warmed up for at least 1 minute, the
instrument should indicate 000 ±5 ppm in fresh air. If the instrument
needs to be zeroed, proceed as follows:
1. Ensure that the instrument is sampling air that is free of sulfur
dioxide.
NOTE: An indication that the instrument was not zeroed in fresh
air is when a large negative SO2 display appears when the
instrument is moved into another area.
2. Using a 1/8" flat-blade screwdriver, turn the
ADJUST potentiometer until the LCD shows 0
ppm. The display shows negative numbers for
zeroing purposes. An instrument can be considered zeroed with a
display bounce of up to ±3 ppm.
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4.3 Backlight ON/OFF
The LCD can be read in low-light areas by setting the front panel
LIGHT switch to ON. The backlight stays on until turned off, or until
the POWER switch is set to OFF.
4.4 Using the Strap
The instrument's elastic strap allows the unit to be either hand-held, or
hung on nearby objects.
By sliding your hand between the instrument and its elastic strap, you
canholdontotheDioxorIIwithaminimumofeffort. Theinstrument's
front panel slide switches can then be actuated by your thumb for one-
handed operation. Or, by releasing the metal clip at the bottom of the
instrument's case, you can hang the instrument by its strap on nearby
objects such as nails, sheet metal, or valve handles.
4.5 Using the Probe
A rigid stainless steel probe with handle, connected to a flexible hose
with sample filter can be used to draw a gas sample into the instrument
from the room, boilers, and other combustible furnaces.
Both hose and probe are detachable from the instrument when sam-
pling without the probe, or when sampling with a different probe is
desired.
Important: If condensation is observed within the hose, do not allow
water level to build up to a point where it cuts off flow.
4.6 Interpreting the Display
Gas Display
The LCD shows SO2 levels in the range from 0 to
1999ppm. ThedisplayontherightindicatesanSO2
level of 025 ppm.
5
Overrange
When the gas sample exceeds 1999 ppm, a “1” is
displayed on the LCD. To clear an overrange con-
dition, leave the instrument turned on and sample
fresh air until the LCD returns to displaying SO2.
Low Battery Indications
When the battery voltage becomes low, the “LO
BAT” indicator appears. Although the instrument
will continue to operate and give SO2 readings
under these conditions, the batteries should be replaced as soon as
possible.
When the battery voltage becomes too low for the
instrument to operate, a “-1” is displayed on the
LCD. No SO2 readings are provided under these
conditions.
4.7 Long-Term Storage
When storing the Dioxor II for extended periods of time, set its
POWER switch to OFF and remove the batteries. The POWER OFF
positionplacesashortacrosstheSO2 sensor,thuskeepingitfrombeing
destabilized while not in use.
5 MAINTENANCE
The Dioxor II needs to be calibrated at regular intervals to ascertain
that it still meets its accuracy specification. A regular calibration
schedule should be established between you and your nearest Bachar-
ach Service Center, unless your facility has the necessary calibration
equipment and personnel trained in the maintenance of gas-detection
equipment.Detailedcalibrationproceduresareprovideduponrequest
from the factory. Detailed maintenance procedures and parts lists are
provided in the Service Manual (19-9166).
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6 PARTS/SERVICE
6.1 Parts List
Item
Part No.
Battery Cover
Probe/Hose Assy.
19-3029
19-3076
6.2 Bacharach Sales/Service Centers
United States
Bacharach S/S Center
7281 Garden Grove Blvd.
Suite H
Garden Grove, CA 92841
(714) 895-0050
Bacharach S/S Center
625 Alpha Drive
Pittsburgh, PA 15238
(412) 963-2164/2157
(412) 963-2640 FAX
(714) 895-7950 FAX
Bacharach S/S Center
8618 Louisiana Place
Merrillville, IN 46410
(219) 736-6178
International
(219 736-6269 FAX
Bacharach, Instruments Int'l
58 Kongensgade
DK 6070 Christiansfeld
Denmark
45 (74) 563171
45 (74) 563178 FAX
Bacharach S/S Center
7300 Industrial Park
Rt. 130, Bldg. 22
Pennsauken, NJ 08110
(609) 665-6176
(609) 665-6661 FAX
Bacharach of Canada
Bacharach S/S Center
5151 Mitchelldale, B-4
Houston, TX 77092
(713) 683-8141
101 Amber Street, Unit #1
Markham, Ontario L3R 3B2
(905) 470-8985/8039
(905) 470-8963 FAX
(713) 683-9437 FAX
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7 HAZARDS OF SULFUR DIOXIDE
Properties:
Sulfurdioxide(SO2)isacolorless, nonflammablegasthathasastrong
pungent odor, is twice as heavy as air, and is highly corrosive to
ordinary metals when mixed with water vapor.
Physiological Effects:
Exposure to sulfur dioxide gas in low concentrations produces an
irritatingaffectonthemucousmembranesoftheeyes,nose,throat,and
lungsduetotheformationofsulfurousacidasthegascomesincontact
with the moisture on these surfaces.
Acuteexposurethroughinhalationmayresultindrynessandirritation
of the nose and throat, choking, sneezing, coughing, and broncho-
spasm. Severe overexposure may cause death through pulmonary
edema(abnormalfluidbuildupinthelungs),orfromrespiratoryarrest.
Prolonged or repeated exposure may cause impaired lung function,
bronchitis, hacking cough, nasal irritation and discharge, increased
fatigue, alteration in the senses of taste and smell, and longer duration
of common colds.
PPM Level Attributes:
1 ppm
2 ppm
Injurious to plant foliage.
Eight-hour time-weighted average (TWA) expo-
sure limit set by the U.S. Occupational Safety and
Health Administration (OSHA)[1][2]
.
3 ppm
Noticeable odor.
6 to 300 ppm
Immediate irritation of the nose and throat.
300 to 500 ppm Immediately dangerous to life.
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First Aid:
Move victims to fresh air. If breathing has ceased, begin artificial
respiration immediately. Administer oxygen if exposure has been
severe and breathing is difficult. Seek medical attention immediately.
References:
[1] Code of Federal Regulations, Title 29 CFR Parts 1900-1910
(Labor), Superintendent of Documents, U.S. Government Printing
Office, Washington, DC 20402.
[2] ThresholdLimitValuesandBiologicalExposureIndices, 1989-90
ed., American Conference of Governmental Industrial Hygienists
(ACGIH), 6500 Glenway Ave., Bldg. D–7, Cincinnati, OH 45211.
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