SNACK O2
Oxygen Gas Analyzer Owners Manual
Analyzer
Rev. 2.1
Teledyne Electronic Technologies
Analytical Instruments
626.934.1500
www.teledyne-ai.com
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Table of Contents
Table of Contents.......................................................3
Introduction................................................................5
Specifications.............................................................5
Oxygen (O2) sensor.......................................................5
Battery Life Notes......................................................5
Functions....................................................................6
Power Switch .........................................................................6
Operate Mode................................................................7
LCD Display...........................................................................7
Buttons Functions (Operate Mode)........................................8
Program Mode...............................................................8
Buttons Functions (Program Mode).......................................8
Parameter Menu ....................................................................8
Operation..................................................................10
Drawing A Sample.......................................................10
Sample Duration ..........................................................10
Sleep Mode Time o ut....................................................10
Auto Hold Function.....................................................11
Battery Level Indicator................................................11
Battery Charging.........................................................11
Filter.............................................................................11
Oxygen Resolution Adjustment.................................11
Sensor Life Indicator...................................................11
Calibration................................................................12
Oxygen Sensor (O2).....................................................12
Maintenance and Adjustments...............................12
Opening / Closing The Analyzer Case .......................12
Replacing the Ox ygen sensor....................................13
Battery Replacement...................................................15
Troubleshooting.......................................................16
Technical Support / Accessories............................17
Warranty...................................................................18
Figures......................................................................19
Figure 1........................................................................19
Figure 2........................................................................20
Figure 3........................................................................21
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Notice: Manufacturer shall not be liable f or technic al or editorial err ors or om issions contained herein;
nor for incidental or consequential dam ages resulting f rom the f urnishing, perform ance, or use of this
material. This guide contains information protected by copyright. No part of this guide may be
photocopied or reproduced in any form without express written consent of the Manufacturer.
Information in this guide is subject to change without notice.
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Introduction
Congratulations on the purchase of a SNACK O2 gas analyzer. We are confident
that you will find this gas analyzer to be accurate, reliable and easy to use.
Designed for portability, this analyzer is well suited for a number of applications and
in all sorts of environments. Please take a moment to browse through this manual
and to familiarize yourself with the various features and functions of the analyzer.
Specifications
Operating Temperature:
32° – 122° (0° – 50° C)
Operating Humidity: 5 – 95% RH, Non-
condensing
Response Time: 90% of reading < 3 sec.
Warm-up Time: None.
Calibration: O2 - Atmosphere (20.9%
O2).
*Battery Life: 1 hour continuous sample
Power Requirements: 12 VDC (500 mA) external
power.
Weight: 48 oz.
* approximation
Oxygen (O2) sensor
Range: 0 – 100% O2
Accuracy:* +/- 1% reading full scale
Repeatability: Better than 0.1% O2
Battery Life Notes
The analyzer has been designed to minimize power consumption. Factors such as
ambient temperature and device usage have an effect on battery performance. For
optimal battery life, follow these tips:
• Place the Power switch in the OFF position whenever analyzer is not being used
for any long period of time.
• Utilize external power source whenever possible.
• In Batt. position, turn off the LCD Back Light when not needed.
• Set the Sleep Mode Timeout to a usable minimum.
• Never store the analyzer over long periods of time with dead batteries. To do so
may cause damage and shorten battery life.
• Do not store the analyzer over long periods of time with the external power
source plugged in.
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Functions
The analyzer has two modes of operation, the Program Mode and the Operate
Mode.
Power Switch
Switch Position Description
OFF Analyzer power is off. Batteries
will continue to charge if Power
Supply is connected.
Batt. Battery Power – Analyzer is on
and drawing power from the
internal batteries. Batteries will
continue to charge if Power
Supply is connected.
Ext. External Power – Analyzer is on
and is drawing power from either
the external battery or the
external power supply. If the
external power supply is
connected, then the Batteries
(both internal and external) will
continue to charge while switch
is in this position. Analyzer will
not operate in this switch
position if the Power Supply or
external battery is not
connected.
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Operate Mode
The Operate Mode is the default mode of operation when the Power Switch is
placed in the on (Batt. or Ext.) position. O2 is displayed in the LCD and the sample
button is available to operate the pump and draw samples.
LCD Display
Displayed Description
O2 XX.X(X)
O
XX.XX (-) Indicates the sample pump is
-
2
Oxygen Reading (%)
running.
•••• •••• •••• ••••
Indicates that the analyzer is in
the battery saving sleep mode.
Cycle the power switch to return
the analyzer to the Operate
Mode.
Low Batt Indicates that the internal
batteries are low on power and
need to be charged.
RE-CAL? Indicates that the internal
processor has reset and
parameter values have been
reset to the default setting.
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Buttons Functions (Operate Mode)
BUTTON FUNCTION
MENU Places the analyzer into the
Program Mode.
ON (Light) Turns on the display Back Light.
OFF (Light) Turns off the display Back Light.
SAMPLE Turns on and off the sample pump.
Program Mode
The Program Mode allows the user to view and change the parameter values (i.e.
Sample duration, Sleep timer, etc.). The user may enter the Program Mode by
pressing the MENU button. Repeatedly press the MENU button to cycle through the
parameter menu. Pressing the SAVE button will save all changed parameter values
and returns the analyzer back to the Operate Mode.
Buttons Functions (Program Mode)
BUTTON FUNCTION
MENU Places the analyzer in the
Program Mode and cycles
through the parameter menu.
SAVE Saves all changed parameter
values and returns the analyzer
to the Operate Mode.
Arrow Up (!) Adjusts parameter values up.
Arrow Down (") Adjusts parameter values down.
YES / NO Answers yes / no questions.
Parameter Menu
Displayed Description
O2 CAL? Calibrate oxygen sensor? Press
the YES/NO button to display
the calibration value.
O2 XX.XX
Oxygen calibration value (%) –
Use the arrow buttons to adjust
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the value.
Samp. XX
Sleep XX
Hold on/off
Sample duratio n – P ump will run
for xx number of seconds then
stop. Adjust using the arrow
buttons.
01 – 99 seconds
00 = No timed duration
Sleep mode timeout – Analyzer
will go into battery saving sleep
mode after xx number of
minutes. Adjust using the arrow
buttons.
01 – 99 minutes
00 = No timeout
Auto Reading Hold – Indicates if
the auto hold function is ON or
OFF. Use the arrow buttons to
toggle between on and off.
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Operation
Drawing A Sample
The following is a general procedure check list to start and use the gas analyzer.
1. Place the POWER switch in either the Batt. or Ext. position. The LCD will
display O2. (Note: the O2 reading will not display until the SAMPLE button has
been pressed.)
2. Connect the sample line to the Sample Connector located at the top of the
analyzer. Ensure that there is an inline filter in the sample line. Failure to use
the inline filter may cause damage to the sensor and sample pump.
3. Place or connect the end of the sample line to the space to be sampled.
A) M.A.P. – Insert the sample needle into the package’s head space. Avoid
placing the needle into product or fluid.
4. Press the SAMPLE button. The sample pump will draw in a gas sample and the
current O2 reading will be displayed. The pump will continue to run until the
Sample Duration times out or until the SAMPLE button is pressed again.
If the Auto Hold function is on, then the O2 displayed value will lock when the
pump stops.
Note: The duration of sample time will vary from one application to another. In
general, the longer you draw in a sample, the more accurate the gas analysis will
be. Adjustments of the Sample Duration timer will be needed to find the right
amount of sample time for your specific application.
5. Press the Light ON button to turn on the LCD Back Light.
Sample Duration
The Sample Duration timer allows you to set the number of seconds the pump will
run and draw in a sample after the SAMPLE button is pressed. The sample pump
may be stopped at any time by pressing the SAMPLE button. This timer can be
adjusted in the parameter menu.
Placing the Sample Duration timer to zero (0) seconds sets the pump to a manual
mode. Press the SAMPLE button to start the pump. T he pump will continue to run
until the SAMPLE button is pressed again.
Sleep Mode Timeout
The Sleep Mode Timeout allows you to set the number of minutes the analyzer will
wait without any button activity before going into the battery saving sleep mode.
This timer can be adjusted in the parameter menu.
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In the sleep mode, the analyzer will shut down the sensors and most of the
processor functions in order to conserve battery power. The sleep mode is indicated
by four dots (•••• •••• •••• ••••) along the bottom of the display.
To return the analyzer to the Operate Mode, cycle the Power switch off and then on.
Auto Hold Function
The Auto Hold function allows the user to have the oxygen value hold in the display
when the sample pump turns off. This function can be turned on or off in the
parameter menu.
Battery Level Indicator
The level of battery power can be indicated by pressing the upper left hand corner of
the analyzer display decal (just above the MENU button). Four chevrons (<<<<)
indicate full battery charge. As the battery charge weakens, the number of displayed
chevrons will decrease.
Battery Charging
Both the internal and external batteries may be charged by plugging the Power
Supply/Charger into the POWER SUPPLY receptacle located at the bottom of the
analyzer.
Filter
In order to prevent damage to the sensors or sample pump it is necessary to use the
inline filter every time you are drawing a sample. The filter should be checked
periodically and replaced if there are any signs dirt or discoloration in the filter.
The analyzer has a secondary, internal filter. Typically this filter will never need to
be changed.
Oxygen Resolution Adjustment
The oxygen resolution adjustment is not functional with the SNACK O2 gas analyzer.
Jumper J1 should remain open.
Sensor Life Indicator
The estimated remaining sensor life can be displayed by pressing the upper right
hand corner of the analyzer display decal (just above the arrow-up button). Four
chevrons (<<<<) indicate that the oxygen sensor is good. As the oxygen sensor
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depletes over time, the number of displayed chevrons will decrease. It is
recommended that the sensor is replaced when two or fewer chevrons are
displayed.
Calibration
Oxygen Sensor (O2)
Electrochemical sensors degrade slowly over time. For optimal performance and to
ensure accuracy, it is recommended that the oxygen sensor be span calibrated daily
using normal outside atmosphere air (20.9% O2). Use the following steps to
calibrate the oxygen sensor.
1. Turn on the analyzer and allow it to warm up for at least one (1) minute. Ensure
the Sleep Mode Timeout is set greater than one minute.
2. Press the SAMPLE button to turn on the sample pump. Allow the pump to draw
in outside atmosphere air (20.9% O2) for thirty (30) seconds or until the oxygen
reading has stabilized.
3. If oxygen reading is greater than +/- 0.3% of the sampled air, then CAL adjust is
recommended. Press the MENU button to enter the Program Mode. The LCD
will display: O2 CAL?.
4. Press the YES/NO button. The LCD will display: O2 XX.XX. Press the arrow
buttons to adjust the O2 value to read 20.90.
5. Press the SAVE button to save the calibration value and to exit the Program
Mode.
Maintenance and Adjustments
Opening / Closing The Analyzer Case
From time to time it will be necessary to open the analyzer case to perform
maintenance and/or replace the oxygen sensor. The following procedure is a step
by step guide to opening the analyzer. Read through the entire procedure before
attempting to open the analyzer case.
Keep in mind that the top half of the case is connected to the bottom half by a nondetachable ribbon cable. Great care should be taken when handling the opened
analyzer.
1. To open the analyzer, place the Power switch to the OFF position and place the
analyzer face-down on a padded, flat surface.
2. Using a phillips screwdriver, completely remove the six (6) screws fro m the back
of the analyzer.
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3. Gripping the entire analyzer, carefully turn over the analyzer and place it face-up
on the flat surface.
4. Carefully remove the top half of the analyzer and place it face-down and to the
right of the bottom half.
5. To close the analyzer, carefully place the top half of the analyzer on top of the
bottom half. Ensure that all tubing and wiring is tucked inside the case. Ensure
that the seal gasket is in place. Check for secure fit of the two halves.
6. Gripping the entire analyzer, carefully turn over the analyzer and place it face-
down on the flat surface.
7. Replace all six (6) screws into the back of the analyzer and tighten snug with a
phillips screwdriver.
Replacing the Oxygen sensor
Typically the oxygen sensor needs to be replaced every eight (8) to ten (10) months.
The following procedure is a step by step guide to replacing the oxygen sensor.
Refer to Figure “A”, Sensor Installation/Replacement Procedure for more detailed
information.
1. Open the analyzer (see Opening / Closing the Analyzer).
2. Carefully pull the oxygen sensor straight up out of the case.
3. Disconnect the ribbon cable from the top of the sensor by lightly spreading open
the two side ejector locks.
4. Gently pull the blue input tube off of the center sensor barb. Next, unscrew the
barb lock fitting off of the sensor sample exhaust output.
5. Discard used sensor.
6. Reconnect the ribbon cable to the top of the new sensor by gently pushing the
cable plug into the sensor socket until the two side ejector locks close.
7. Reconnect the blue sample tube to the center sensor barb and reconnect the
sample exhaust tube to the barb lock fitting.
8. Carefully place the oxygen sensor back down into the case. Make sure that the
sensor is pushed down towards the bottom of the case to prevent the sensor
from interfering with the top circuit board.
9. Close the analyzer (see Opening / Closing the Analyzer) and calibrate (see
Oxygen Calibration).
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Sensor Installation/Replacement Procedure
for the SNACK O2 Analyzer
STE P 1
Place the analyzer face down on a soft
surface and remove the six screws
from the back of the case. Without
opening the case, place the analyzer
face up.
STE P 2
With the analyzer faced up, carefully l ift
the top secti on from the bottom sectio n.
Place the top section face down to the
right of the lower section. Be aware
that the two sections are connected by a
non-detachabl e ribbo n cable
STE P 3
Locate the sensor connector cable
(ribbon c able ). Ge ntly push the ca ble
plug into the sensor socket until the
two Si de Eje ctor l ocks clo se.
.
STE P 4
Locate the blue sample supply
tube. G ently push the tube onto
the ce nter sensor bar b.
STE P 5
Locate the Sample Discharg e tube
with the lure lock fitting. Screw the
lure lock to the sensor discharge f itting.
STE P 6
Carefully place the sensor back
down into the case as shown. Close
the case and replace the six screws.
CALIBRATE THE SENSOR BEFORE USE.
Figure A
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Battery Replacement
Over time the performance of the internal batteries may degrade and replacement of
the batteries may become necessary. Read Battery Life Notes at the beginning of
this manual to ensure optimal battery performance. Contact your analyzer
distributor or Teledyne Analytical Instruments to purchase replacement batteries.
1. To replace the internal batteries, place the Power switch to the OFF position.
Disconnect any external power supply.
2. Open the analyzer case (see Opening / Closing the Analyzer).
3. Carefully lift the two batteries up and out of the case. Disconnect the two
batteries from the controller board by pulling the each battery connector straight
up.
4. The battery connectors are polarized and can only plug into the receptacles in
one direction. Plug in the new batteries and carefully place them into the case
with one stacked on top of the other..
5. Close the analyzer case (see Opening / Closing the Analyzer) and charge the
new batteries for at least six (6) hours before using analyzer.
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Troubleshooting
Problem Solutions
No display.
Pump is very slow or will
not run.
Unstable sensor reading.
• Check the position of
the Power switch.
• Check battery life.
• Check battery life
• Check for clogged or
blocked sample line.
• Check for clogged or
blocked needle.
• Check for dirty filter.
• Check for clogged
hose inside analyzer
and internal filter.
• Adjust pump speed.
• Check for clogged or
blocked sample line.
• Ensure Sample
exhaust port is not
blocked.
Sample pump stops
immediately after starting
it.
• Increase Sample
Duration time in the
Parameter Menu.
• Check for dirty filter or
blocked sample line.
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Analyzer does not
function in the Ext.
Power switch position.
• Ensure the power
supply is plugged into
the External Power
receptacle or the
external battery is
plugged into the
External Battery
receptacle.
• Ensure there is power
to power supply.
Batteries do not charge.
• Ensure the power
supply is plugged into
the External Power
receptacle.
Batteries do not hold a
• Replace batteries.
charge for more than a
few minutes.
O2 reading appears to be
incorrect.
• Recalibrate the sensor.
• Sensor may need to be
replaced.
O2 reading does not
appear on the display in
the Program Menu.
• Cycle the SAMPLE
pump on and then off
then return to the
Program Menu.
Technical Support / Accessories
For technical assistance, please contact Teledyne Analytical Instruments.
Accessories & Recommended Spare Parts
• Carrying Case w/ shoulder strap
• External Battery Pack (includes carrying case)
• Oxygen Sensor (UFO-130)
• Replacement Filters
• Side Draw Needles
• Sample Probe Kit (needle, filter, tubing, and connector)
• Replacement Batteries
• Septum
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Warranty
Covered and Duration of Warranty
Manufacturer warrants that the Products you have purchased from Manufacturer or from a
Manufacturer authorized reseller is f ree from defec ts in m aterial and workm anship f or a period of one
(1) year from the date of purchase. Your sales receipt, showing the date of purc hase is your proof of
the date of purchase. This warranty extends only to you, the original Purchaser and is not
transferable to anyone who subsequently purchases the Products from you.
Terms of Warranty
If the Products do not conform to this Lim ited Warr anty during the warranty period (as herein above
specified), Purchaser shall notify Manufacturer or authorized reseller of the claimed defects and
demonstrate to Manuf acturer the said defects. If the defects are properly reported to Manufacturer
within the warranty period, Manufacturer shall repair or, at Manufacturer’s option, replace defective
Products with a new or used functional unit that is equivalent or superior in performance to the
original Products. All exchanged parts and Products replaced under this warranty will become
property of the Manufacturer.
Limitations of Warranty
THE FOREGOING IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED.
Manufacturer does not warrant against damages or defects as a result of accident, abuse, or
improper use, handling or operation of the Pr oducts; (b) as a result of an act of God; (c ) by the use of
parts not manufactured or sold by Manufacturer; (d) by modifications of the unit; or (e) as a result of
service by anyone other than the Manufacturer. This warranty excludes items considered
expendable or consumable(i.e. filters, depletable sensors)
EXCEPT AS EXPRESSLY SET FORTH IN THIS WARRANTY, MANUFACTURER MAKES NO
OTHER W ARRANTIES, EXPRESSED OR IMPLIED, INCLUDING ANY IMPLIED W ARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. MANUFACTURER
EXPRESSLY DISCLAIMS ALL WARRANT IES NOT STATED IN THIS LIMIT ED WARRANT Y. ANY
IMPLIED WARRANTIES THAT MAY BE IMPOSED BY LAW ARE LIMITED TO THE TERMS OF
THIS EXPRESS LIMITED WARRANTY.
THIS W ARRANTY IS EXCLUSIVE. The sole and exclusive obligation of Manufacturer shall be to
repair or replace the defective Products in the manner and for the period provided above.
Manufacturer shall not have any other obligation with respect to the Products or any part thereof,
whether based on contract, tort, strict liability or otherwise. Under no circumstanc es, whether based
on this Limited Warranty or otherwise, shall Manufacturer be liable for lost profits, lost savings,
incidental, special, or consequential damages. Manufacturer is not liable for any claim made by a
third party or made by you for a third party.
Manufacturer's em ployees or representatives' ORAL OR OT HER W RIT TEN STAT EMENTS DO NOT
CONSTITUTE WARRANTIES, s hall not be relied upon by Purchaser, and ar e not a part of this limited
warranty.
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Figures
SNACK O
2 ANALYZER
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Figure 1
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Figure 2
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Figure 3
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