AMI 2001LC User manual

AMI
Oxygen Analyzer Manual
Model 2001LC
AMI, Costa Mesa, CA

AMI Analyzer Manual Contents i
Contents
Preface 1
Caution 1
Address 1
Model 2001LC Series Oxygen Analyzer 2
Introduction 2
Features: 2
Oxygen sensor: 3
Sensor Warranty: 3
Instrument Warranty: 3
Installation and Operation 4
Receiving the analyzer 4
Installation 4
Location: 4
Precaution 4
Installation Procedure 5
Connect gas and power lines: 7
Interconnections: 8
Alarm connections: 8
Output connections: 8
Serial connections: 8
Sample Handling: 9
Operation 10
Analyzer operation 10
Sample tubing and components 10
Leaks 10
Exhaust 10
Calibrating the analyzer 11
Output range concept: 12
Front Panel Controls: 12

AMI Analyzer Manual Contents ii
Output Ranges 13
View Output Range 13
Change Output Range 13
Alarm Set Points 13
View Alarm Set Points 13
Change Alarm Set Points 13
Alarm Bypass 14
Verify Span Factor: 14
Read the Temperature: 14
Alarm Functionality: 14
Maintenance and troubleshooting 15
Maintenance: 15
Periodic Calibration: 15
Sensor Replacement: 15
Sensor replacement cautions: 16
Sensor replacement procedure: 17
Bleeding a regulator 18
Troubleshooting 19
All oxygen applications 19
Specifications and Disclaimer 21
Specifications: 21
Disclaimer 22

AMI Analyzer Manual Preface 1
Preface
The AMI series of analyzers provide the latest in high-definition oxygen analysis. The
series includes trace (ppm) and percent models in several configurations. All of them
share the same basic design approach, using AMI-manufactured oxygen sensors and
advanced high definition electronics for noise and interference free performance. Several
aspects of the design are the subject of patents, number 5,728,289 and 6,675,629; the
sensors have a patent pending.
Trace Oxygen measurement is difficult because the air contains 20.9% (209,000ppm) of
oxygen, and it can get into a pressurized pipeline through the smallest leaks. Oxygen
molecules will enter through a leak, no matter the pressure or the nature of the gas in
the line. This analyzer is an exceptionally sensitive leak detector –including those
provided by improper installation. Make sure you read this manual carefully prior to
installation.
Caution
Read and understand this manual fully before attempting to use the instrument. In
particular understand the hazards associated with using flammable or poisonous gases,
and associated with the contents of the sensor used.
Address
Advanced Micro Instruments
225 Paularino Ave
Costa Mesa, CA 92626
[phone]
www.AMIO2.com
Last Revised: 08/31/2018

AMI Analyzer Manual Model 2001LC Series Oxygen Analyzer 2
Model 2001LC Series Oxygen Analyzer
Introduction
The Advanced Micro Instrument Oxygen Analyzer Model 2001LC provides the latest in
low-cost high precision oxygen measurement. It is designed for monitoring oxygen in
trace (ppm) ranges in a non-hazardous area.
This manual covers software version 1.0.
Features:
Compact size
Unique patented cell block
Auto-ranging display with user-
selectable output range
Front panel sensor access
Optional air or span gas calibration,
no zero gases required
Virtually unaffected by hydrocarbons
or other oxidizable gases
High accuracy and fast response
Large liquid crystal display
Backed by a two year warranty
(excluding sensor)
Standard isolated 4-20mA output
Two fully adjustable alarm relay
contact closures 24VDC/230VAC 5A.

AMI Analyzer Manual Model 2001LC Series Oxygen Analyzer 3
Oxygen sensor:
AMI manufactures its own electrochemical sensor. This measures the concentration of
oxygen in a gas stream, using an oxygen specific chemistry. It generates an output
current in proportion to the amount of oxygen present, and has zero output in the
absence of oxygen, thus avoiding any requirement to zero the analyzer. The cell is linear
throughout its range. The span calibration may be performed using standard span gases
or ambient air. Unlike competitive sensors, the AMI sensor is made using a high capacity
metallic body that provides long life with about twice the active ingredients of
conventional sensors, but with much faster come-down times –typically under twenty
minutes to 10ppm from a 1 minute air exposure.
Sensor Warranty:
The sensor is warranted to operate for a period determined by its class. If the sensor
ceases to operate correctly before this time has elapsed, contact AMI for a return
authorization for evaluation. If there is any evidence of defective material or
workmanship the sensor will be replaced free of charge.
NOTE: Any evidence of abuse or physical damage, such as a torn membrane, will void
the warranty.
Instrument Warranty:
Any failure of material or workmanship will be repaired free of charge for a period of two
years from the original purchase (shipping date) of the instrument. AMI will also pay for
one way shipment (back to the user).
This warranty does not cover the sensor, which is covered by its own warranty (see
above).
Any indication of abuse or tampering will void the warranty.

AMI Analyzer Manual Installation and Operation 4
Installation and Operation
Receiving the analyzer
When you receive the instrument, check the package for evidence of damage and if any is
found, contact the shipper.
Do not install the sensor until the analyzer is completely installed, the gas lines are
plumbed and the electrical connections are all made; and sample or a suitable low
oxygen level gas such as nitrogen or a low level span gas is ready to flow into it.
Installation
Location:
The unit is designed to be mounted in a panel in a general purpose area. It should be
mounted at a suitable viewing level. Refer to the drawing (figure 1) showing the analyzer
dimensions. It is not suitable for use in a hazardous area or with flammable gases.
Although the unit is RFI protected, do not to mount it close to sources of electrical
interference such as large transformers, motor start contactors, relays etc. Also avoid
subjecting it to significant vibration.
Precaution
Do not install the sensor until you have connected
the plumbing and power and are ready to flow
zero gas. The sensor will become saturated with oxygen by exposure to air
for more than a minute or so, and once it is saturated, it may take many hours or
even weeks to return to a stable low reading.

AMI Analyzer Manual Installation Procedure 5
Installation Procedure
Figure 1. Back panel of 2001LC analyzer
Don’t open the T-2 or T-4 Oxygen Sensor bag until step 20 of this procedure!!!
1. Mount analyzer at a convenient eye level.
2. Confirm sample pressure is less than the analyzer specification (100psig). If it is higher,
use a suitable regulator which must have a stainless steel diaphragm.
3. Deal with any potential condensation or liquid contamination issues.
4. Connect the sample line to the sample inlet port with ¼” ss tubing.
5. Pressurize the sample line to line pressure (between 1psig and 20psig).
6. Leak check every fitting and weld from the analyzer inlet to the sample tap.
7. Connect vent line to outside or a suitable purge system.
8. Connect power, relay contacts, and analog output. If using conduit, run the power and
alarms in one conduit, and the analog output in the other.
9. Turn on the analyzer.
10. Adjust the sample flow to approximately 1 SCFH with the Flow control valve.

AMI Analyzer Manual Installation Procedure 6
11. Allow the sample gas to purge the unit for a few minutes. Make sure the cell cap is in
place.
12. Set up the alarms and the output range from the front panel of the analyzer.
13. Unscrew the cell cap, and install the oxygen sensor.
14. Remove the shorting tab on the sensor.
15. Stabilize for 45 seconds ONLY, adjust span to 20.9%.
16. Replace the Cell cap and tighten it down (hand tight).
17. Purge with sample gas for half an hour, or until the oxygen reading has fallen to low ppm
levels.
18. If desired, span with known calibration gas.
a) Connect a regulator (with Stainless Steel diaphragm ONLY) to span gas tank.
b) Bleed high pressure side of the regulator 7 times.
c) Bleed low pressure side of the regulator 7 times.
d) Shut off the regulator outlet valve and leak check all the tank fittings, gauges and
packing glands with Snoopor equivalent liquid leak detector (not spray).
e) Disconnect the sample tubing from the inlet port, either by physically removing it or by
using an external three-way valve.
f) Flow calibration gas WHILE you are connecting the span gas tubing to the inlet fitting
or the selection gas valve port. Allow the gas to purge through the fitting for about 20
seconds before you tighten it.
g) Press the ALARM BYPASS button, and adjust the time displayed to a suitable value
(typically 10 minutes).
h) Verify that the analyzer reads within about 15% of the span gas value.
i) If so, adjust the analyzer span (see below) until it reads the span gas value.
j) Let it go back to normal operation (the “SPAN” flag goes out on the LCD display), then
press the UP arrow and note the number displayed (the “Calibration factor).
k) Disconnect the span gas from the inlet fitting and reconnect the inlet tubing.
l) Turn off the valve on the span gas tank (so it doesn’t all leak out).
If the span gas reads worse than 15% wrong, something is wrong either with the gas, or with the
plumbing (you have a leak) or some other error. See the troubleshooting section for some ideas
about curing this.

AMI Analyzer Manual Installation Procedure 7
Figure 2. Outline and Cut Out Drawing
Connect gas and power lines:
Do not install the sensor until the gas lines have been connected and the electrical
connections made.
Install the unit, and connect the sample gas inlet and exhaust, power and appropriate
alarm and output connections. Connect the sample gas line to the fitting on the rear
panel using the ¼” compression fittings provided, and the exhaust line to a suitable vent.
Sample gas:
The sample gas inlet pressure should be between 1-40psig.
Span gas:
Span gas (if desired) must be provided by a user-supplied valve.
Exhaust:
The exhaust line may be left open, or vented to a suitable vent. If used with a scavenging
system, use a large diameter pipe (for example, ½” pipe) as the input to the scavenging
system, and allow the ¼” vent to terminate a little way inside this larger line without
sealing it. The scavenging system will then draw in room air along with the sample, while
leaving the exhaust at atmospheric pressure.
8.60
3.005.05
9.00
7.92
4.81
Ø0.21
X4
Analyzer case outline (dashed) Cut out Front panel outline

AMI Analyzer Manual Installation Procedure 8
Power connections:
The 2001LC is designed to be operated from a 24V power supply only. Use a suitable
wall adapter, or other kind of stable DC power supply. Make sure the ground is
connected to a real ground –otherwise you may experience excessive noise and RFI
interference.
Interconnections:
Figure 3. Back panel screen print of the 2001LCS.
Alarm connections:
The alarm connections are single pole double throw relays, i.e. Form C contacts. They
are normally preset to operate as high alarms, failsafe, with no alarm delay, though they
can be supplied with other settings. By failsafe is meant that the relays are powered
when NOT in alarm, so that if power fails, they indicate an alarm condition. The contacts
can handle AC or DC voltages, and can carry up to 5A of current for a resistive load.
Inductive loads such as solenoid valves should be “snubbed” – we suggest that you
connect diodes or Zener diodes or “Transzorbs” directly across them to absorb the
inductive spike. Do not connect them across the relay terminals on the analyzer, since
the resultant current loop will transmit a lot of RFI that could upset sensitive devices
nearby.
Output connections:
This unit is equipped with an isolated 4-20mA output. It is capable of driving a 600 Ohm
load and will saturate at more than 125% of the nominal full scale range.
Serial connections:
No serial connection is provided on this analyzer.

AMI Analyzer Manual Installation Procedure 9
Sample Handling:
Figure 4 Flow Schematic of the 2001LC
The analyzer expects to get a sample of gas at a pressure between 1 and 100psig. A
built-in needle valve and flowmeter allow the user to control flow to 1SCFH with any
pressure within this range. Higher pressure applications, or varying pressure
applications, will need a regulator to control pressure. The analyzer is not sensitive to
flow changes between about 0.2SCFH and 5 SCFH, but it is sensitive to back pressure
changes (changes in exhaust pressure).
The flowmeter is mounted on the exhaust so that the oxygen reading is not affected by
potential leaks around the flowmeter tube.
Sensor
Flow
Meter
Needle
Valve Cellblock
2001LC
Sample
Exhaust

AMI Analyzer Manual Installation Procedure 10
Operation
Analyzer operation
It is just as important that the analyzer’s sample system – the components used to
control the gas flow –are perfect as the measurement methodology itself. No matter how
good the analyzer is, if you don’t connect the plumbing correctly you won’t get good
results.
Sample tubing and components
Oxygen diffuses through plastics, to a greater or lesser extent. Standard blue poly tubing
will diffuse about 1ppm per foot into 1SCFH at 70°F. Silicone tubing is very much worse.
In general, use stainless steel tubing, or at least copper tubing, not plastic. Use high
quality compression fittings such as “Swagelock™” or “Gyrolock™” and high quality
stainless steel filters, valves or regulators if necessary. Make sure that they are
assembled correctly and perform a thorough leak test on the sample system before use.
The analyzer expects to see sample pressures between about 1 psig and 100psig. Higher
pressures will make the flow control valve very touchy. If your pressure is higher than
this use a regulator with a stainless steel diaphragm to bring the pressure down
appropriately. The analyzer is not very much affected by changes in flow rate and the
internal flow meter is adequate for setting the flow. Don’t use a high precision external
flowmeter in front of the analyzer because oxygen will diffuse in through its O rings.
The span gas pressure should also be held below 100psig. If you permanently connect a
span gas tank to it via a user-supplied three way valve, make very sure that the
connection is leak tight as otherwise not only will the calibration be in error but also you
will lose all of your span gas as it leaks out.
Leaks
If you suspect a leak due to high oxygen readings, change the flow rate and see how long
it takes for the oxygen reading to change. A higher flow rate will dilute the effects of a
leak so that the reading will drop as you increase the flow (this is a very good way of
making sure that you do not in fact have a leak, by the way). Turn the flow up from 1
SCFH to 2 SCFH using the front panel valve and see how long it is before the reading
changes. If it does so immediately, the leak is close to the analyzer. If it takes longer, the
leak is further away.
Exhaust
The exhaust port of the analyzer should be given at least a foot of tubing, but it should
not be allowed to become pressurized, or the readings will be affected. If the sample gas
is innocuous, such as pure nitrogen, it can be vented into the room with no ill effects, if
the room itself is ventilated. Otherwise it should be vented outdoors or brought into a
scavenging system. If the latter, have the scavenging system suck in room air around the
exhaust line so that the pressure at the exhaust is atmospheric. A typical way of doing
this is to have the scavenging system suck on a 1” pipe, and have the ¼” exhaust line
from the analyzer extend six inches or so into the end of the pipe.

AMI Analyzer Manual Installation Procedure 11
Calibrating the analyzer
The oxygen sensor gradually gets used up over its life, and as it does so its sensitivity
slowly drops until it is at the end of its life, when the sensitivity drops much faster.
Therefore you have to calibrate the sensor every so often to make sure that your readings
are correct.
There are two ways of doing this. You can use a span gas, a mixed gas containing a
certain level of oxygen in a background gas that ideally matches your sample, or you can
use air. The advantage of using air is that its value really is 20.9% and it doesn’t change;
the disadvantage is that it means that the sensor is exposed to air and so it will take a
while for the reading to come down again afterwards. Typically, at room temperature,
and AMI analyzer will take about fifteen minutes or less to come down to below 10ppm
after a one minute exposure to air.
The advantage of using a span gas is that you can calibrate it to a value close to the
range of interest –often people use 80ppm oxygen in nitrogen as the span gas. You may
have political reasons for having to do this. The sensor recovers from this level of oxygen
immediately so there is no down time before the analyzer is working properly again. The
disadvantage is that span gases sometimes are incorrectly made, and they can be
contaminated by improper handling. Also you will have to provide an external
sample/span selection valve.
Calibrating with a span gas
Fist put a suitable regulator on the span gas tank, and “bleed” it as described below.
This step is essential, since otherwise the air in the regulator will contaminate the gas in
the tank. Connect the regulator to the analyzer with a stainless steel line, and leak
check the connection with “Snoop™” or similar leak detection fluid. Purge the line for
several minutes with a small flow of gas prior to doing this, and leave the gas flowing
while you make the connection to the analyzer. This prevents a slug of air from giving
you excessively high readings when you start spanning the analyzer.
Make sure the analyzer is seeing a low oxygen level gas –you want the analyzer to go UP
to the span gas, not down to it, particularly not from air. Otherwise it will take a very
long time to get a good calibration.
When all is assembled, flow the span gas into the analyzer, and you should see the
reading move to the span gas value. Assuming it stabilizes somewhere reasonably close,
press the UP or DOWN button until the reading on the LCD shows what the span gas
bottle says the value should be.
Calibrating with air
You can either connect a compressed air line –from the plant air, not a bottle of
compressed air –to the sample inlet via a selection valve or you can shut off the flow and
open the cell cap on the front of the analyzer. If you use compressed air, go through the
same procedure as above, only adjust the oxygen reading to 20.9%.
If you do not have compressed air, unscrew the cell cap on the front of the analyzer.
Blow some air under the sensor by waving a book or some such at it. Adjust the reading
as before to 20.9% and then screw the cell cap back on the analyzer. Bring up the flow of
the sample gas.
In either case, make sure you don’t take more than a minute to do this. The reading may
not stabilize exactly at 20.9%, but don’t worry about that – any slight error will be
inconsequential at the operating levels.
Let the analyzer come down to a low reading on the sample gas.

AMI Analyzer Manual Installation Procedure 12
Alarm Bypass
Press the alarm bypass button prior to calibration if you have the alarms attached to
anything, so as to stop them from going off when the analyzer sees the high oxygen level
in the calibration gas. You can adjust the bypass time when you press that button –it
shows what the bypass time is, and you can change it with the UP or DOWN buttons as
desired. The analog output will also be held constant during this time.
Span problems
Sometimes you will run into problems. If the sensor is old, it may not be able to come up
to the span gas level. If so, you need a new sensor. Sometimes sensor will calibrate on
span gas but will fail on air. This also indicates an old sensor. You can see the sensor
state by pressing the UP button when the sensor is showing the oxygen level –it displays
the “Span factor”, a number between about 450 and 1000. As the sensor gets old each
calibration will increase this number and when it gets up to about 850 it is time to
replace the sensor.
Sometimes the sensor won’t calibrate on span gas properly, but since it is a new sensor
you figure something must be wrong. If something like this is happening, perform an air
calibration and allow the sensor to come back down to a low reading on the sample.
Then perform a span gas calibration only don’t adjust the span factor with the UP or
DOWN buttons, and see what the analyzer says the gas contains. If the gas value isn’t
what you think it should be, it is the gas that is wrong, not the analyzer, because that air
calibration is in fact very valid. You will have to trouble shoot whatever has happened
with your gas.
Output range concept:
The analyzer displays the oxygen level in appropriate units on the LCD, automatically
adjusting its sensitivity as required. Meanwhile the analog output and the alarms are set
on a single (user selectable) “Output” range.
For example, you can set the analog output to correspond to 0-100ppm, and the alarms
to be say 40ppm and 50ppm (i.e. 40% and 50% of range), activating above set point. If
the oxygen level actually is 25ppm, the display will show 25.0ppm, and the output signal
will be at 25% of full scale. If the oxygen level becomes 200ppm, the display will show
200ppm, but the 4-20mA output will be saturated, and the alarms will both be activated.
If you now manually change the output range to 0-1000ppm, the reading will stay at
200ppm, the 4-20mAoutput will go to 20% of scale, and the alarms will de-activate, since
they now correspond to 400ppm and 500ppm, i.e. still 40% and 50% of range.
Front Panel Controls:
The controls all work the same way. You press the function you want for a second, and
let go, and the display will show the value corresponding to that function, for about 3
seconds. For example, if you press the OUTPUT RANGE button for a second, the display
will show the full scale output range. You can change this value (if the security setting
allows) by then pressing the UP or DOWN arrow button within about three seconds. You
can either press this once for a small change, or you can hold it down, in which case the
number will change slowly at first, and then faster. If you overshoot your target, press
the other button to go back, and the display will again start moving slowly. If you release

AMI Analyzer Manual Installation Procedure 13
any of the buttons, or don’t press the UP or DOWN buttons for three seconds, the unit
will cycle back into normal operation and store the new value.
Output Ranges
The output range is the range to which the 4-20mA analog output signal and the alarm
settings correspond.
Output ranges
0-10ppm, 0-50ppm, 0-100ppm, 0-500ppm, 0-1000ppm, 0-5000ppm,
0-1%, 0-5%, 0-25%.
View Output Range
Press the OUTPUT RANGE button on the front panel for a second, and let go. The display
will show the full scale value of the output range for about three seconds, and then
change back to the oxygen reading.
Change Output Range
Press the OUTPUT RANGE button for a second and let go. While the output range value
is displayed (you have approximately three seconds), press the UP or DOWN arrow
buttons to change it. The output range will change to whatever you want. Simply leave
it or select another function and the range will be stored and the system updated. You
will note that if this results in an alarm change, the alarms will change as soon as the
unit starts showing the reading again. If the output range does not change, the security
level must be set to full or span only security. In this case change the security level with
the laptop and the AMI User Interface program.
Alarm Set Points
The alarm set points can be viewed and changed from the front panel.
View Alarm Set Points
Press either of the ALARM SET POINT buttons and let go. The alarm set point will be
displayed for about 3 seconds, and the then the display will revert to the oxygen reading.
The set point shown relates to the current output range. If you change the output range,
the alarm set point will change to a new value which is the same percentage of the new
output range. For example, if the output range is 100ppm, you can set an alarm set
point to be half way up, i.e. 50ppm of oxygen. If you then change the output range to
500ppm, the alarm set point will remain half way up the new range, and be displayed as
250ppm.
Change Alarm Set Points
Press one or the other ALARM SET POINT button for a second, and let go. While the
alarm set point is showing, press either the UP or DOWN arrow button and hold it until
the value is what you want. The numbers will scroll slowly at first and then speed up: if
you press the other button, or release and re-press the one you are using, the number
will start going slowly again.

AMI Analyzer Manual Installation Procedure 14
Alarm Bypass
Press the ALARM BYPASS button for a second and release it. The display will show the
alarm bypass time in minutes, and if the analyzer was indicating an alarm, it will be
turned off and held off for the period of the alarm bypass time. The alarm bypass time
can be adjusted by pressing the UP or DOWN arrow buttons.
Verify Span Factor:
The analyzer features a “Span Factor” display to help you determine the state of the
sensor. As the sensor ages, its output decreases gradually, and therefore the span factor
has to be turned up during calibration to compensate.
Press and release the UP button while the unit is showing its reading to view the span
factor. The factor corresponds to the setting of a traditional ten turn span pot with a
turns counter dial on it.
The setting should be between 300 and 600 for a new sensor. When you calibrate the
analyzer, check this value before and after the calibration. You should see that the value
goes up slowly over the life of the sensor. When the value has gotten up to 1000, the
sensor has reached the end of its life and should be replaced. Also, if the value suddenly
jumps, it indicates that the sensor is getting close to the end of its life.
Read the Temperature:
Press the DOWN arrow button. The display will show the temperature of the cell block in
degrees Fahrenheit. The value is limited to 25F at the lowest, and about 120F at the
highest. Values outside this range will damage the sensor.
Alarm Functionality:
The model 2001LC series has two alarms, with two associated relays. Normally, these
are set to operate as high alarms (they go into alarm if the oxygen level goes above the set
point), and to close their associated relays upon alarm. Their time delay is set to zero,
and they do not latch (unless specifically requested otherwise). An Alarm state is
indicated by the word “ALARM” appearing on the display.
Using the analyzer front panel you can change the alarm set points, but you cannot
change any of the other settings. If you want them to operate below alarm set point, to
latch, or to operate in a pulse mode, you have to order the analyzer set up that way. In
this case contact the factory.

AMI Analyzer Manual Maintenance and troubleshooting 15
Maintenance and troubleshooting
Maintenance:
The model 2001LC is virtually maintenance free other than for periodic calibration and
occasional sensor replacement.
Periodic Calibration:
The analyzer should be calibrated about once every month to obtain the best accuracy.
The sensor typically declines in sensitivity by about 1% per month, so a monthly
calibration is usually satisfactory. Use in a particularly aggressive environment may
degrade the sensor faster: in this case calibrate more often.
Sensor Replacement:
This should be done based on the Span Factor feature, rather than as a response to a
dead sensor. See the chart below for recommended sensor replacement.
Sensor
Part
number
Description
Expected life
T2
4SEN09-1
Trace oxygen - CO2 background
9 months to 2 years
P2
4SEN03-1
0-50% Percent oxygen - inert gas
9 to 12 months
P3
4SEN04
0-25% Percent oxygen - CO2 background
9 to 12 months
P4
4SEN08
100% oxygen - inert impurity
6 to 9 months
Table 1. AMI sensor types

AMI Analyzer Manual Maintenance and troubleshooting 16
Sensor replacement cautions:
CAUTION: The sensor contains a caustic or acid liquid. If there is any sign of a
liquid in the cell compartment, do not allow it to come into contact with
your skin. If it does, immediately flush the affected area with water for a
period of at least 15 minutes. Refer to the Material Safety Data Sheet
provided.
Dispose of leaking or used sensors in accordance with local regulations.
Sensors usually contain lead which is toxic, and should generally not be
thrown into ordinary trash. Refer to the MSDS to learn about potential
hazards and corrective actions in case of any accident.
Figure 5. Inserting sensor in cell block

AMI Analyzer Manual Maintenance and troubleshooting 17
Sensor replacement procedure:
The sensor is provided in a special sealed bag. Do not open this until you are
immediately about to install the sensor.
Before installing sensor, make sure the power is ON.
1. Press the ALARM ACKNOWLEDGE.
2. Turn the gas flow down to zero on the flowmeter.
3. Unscrew the cell block cap, being careful not to lose the O ring.
4. Carefully remove old cell by pulling the tab on the label.
5. Inspect the cell block cavity, and if any sign of moisture clean it out with a Q tip or
similar. Make sure that the contact springs inside the block are intact. Be careful not
to snag them with the Q tip.
6. Verify that the sealing O ring is in place in the cell cap groove. Verify that the O ring
and the cap are clean and free of any particulate deposits (such as dirt).
7. Carefully open the bag using a pair of scissors or a knife. Make sure you don’t cut
yourself or stab the sensor! In the rare event that the sensor has leaked there will be
liquid in the bag. If so do not proceed - you need a new sensor. Be careful that you
don’t poke anything such as a fingernail through the membrane.
8. Don’t pull out the shorting tab yet!
9. Holding the sensor by its tab, membrane side down, slide it into the cell block (gold
plated contact side of sensor should be facing up touching the cell block contacts.
Make sure the tab is pointing towards the outside so you can pull it out!
10.When the sensor is pushed in all the way, pull out the shorting tab.
11.Let the reading stabilize and adjust it after a minute to 20.9%.
12.Turn up the flow of zero (or sample) gas.
13.Carefully replace the cap, making sure that you do not cross thread it, and tighten
firmly by hand. Do not over-tighten.
14.Make sure the zero or sample gas flow is set to 1 SCFH.
15. Let the reading come down to a low level, and then if desired, calibrate it using a span
gas.