Bacharach 2810 Troubleshooting guide

CO2Analyzer
2810/2815/2820
Instruction 19-9222
Operation & Maintenance
Rev. 9 – November 2005
Product Leadership • Training • Service • Reliability
2
3

AInstruction 19-9222
WARRANTY
Bacharach, Inc. warrants to Buyer that at the time of delivery this Product will be free from
defects in material and manufacture and will conform substantially to Bacharach Inc.’s
alicable secications. Bacharach’s liability and Buyer’s remedy under this warranty
are limited to the repair or replacement, at Bacharach’s option, of this Product or parts
thereof returned to Seller at the factory of manufacture and shown to Bacharach Inc.’s
reasonable satisfaction to have been defective; provided that written notice of the defect
shall have been given by Buyer to Bacharach Inc. within one (1) year after the date of
delivery of this Product by Bacharach, Inc.
Bacharach, Inc. warrants to Buyer that it will convey good title to this Product. Bacharach’s
liability and Buyer’s remedy under this warranty of title are limited to the removal of any
title defects or, at the election of Bacharach, to the replacement of this Product or parts
thereof that are defective in title.
THEFOREGOINGWARRANTIESAREEXCLUSIVEANDAREGIVENANDACCEPTEDIN
LIEU OF (I)ANYANDALLOTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
WITHOUT LIMITATION THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE: AND (II) ANY OBLIGATION, LIABILITY,
RIGHT, CLAIM OR REMEDY IN CONTRACT OR TORT, WHETHER OR NOT ARISING
FROM BACHARACH’S NEGLIGENCE,ACTUALOR IMPLIED.The remedies of the Buyer
shall be limited to those provided herein to the exclusion of any and all other remedies
including, without limitation incidental or consequential damages. No agreement varying
or extending the foregoing warranties, remedies or this limitation will be binding upon
Bacharach, Inc. unless in writing, signed by a duly authorized ofcer of Bacharach.
Notice:
Product imrovements and enhancements are continuous, therefore the secications and information con-
tained in this document may change without notice.
Bacharach, Inc. shall not be liable for errors contained herein or for incidental or consequential damages in con-
nection with the furnishing, performance, or use of this material.
No part of this document may be photocopied, reproduced, or translated to another language without the prior
written consent of Bacharach, Inc.
BACHARACH®is a registered trademark of Bacharach, Inc.
All other trademarks are the property of their respective owners.
Copyright © 1998–2005, Bacharach, Inc., all rights reserved.
Register Your Warranty by Visiting
www.bacharach-inc.com

CO2Analyzer 2810/2815/2820
Instruction 19-9222 i
Contents
1.0 INTRODUCTION................................................................................1
1.1 General .......................................................................................1
1.2 Main Features............................................................................1
1.3 Units of Measurement ...............................................................1
2.0 OPERATION .......................................................................................2
2.1 Important Note .......................................................................... 2
2.2 Switching the Analyzer ON/OFF .............................................. 2
2.3 Pump Operation (2815/2820) ....................................................3
2.4 Pump Contamination (2815/2820) ............................................3
2.5 High Humidity Gas Sampling (2820) .......................................3
2.6 Storing Readings........................................................................4
2.7 Battery Low Display ..................................................................4
2.8 Battery Charge Display.............................................................5
2.9 Backlight ....................................................................................5
2.10 Audible Gas-Level Tone (2815/2820) .......................................5
2.11 Fault Condition Warning..........................................................5
2.12 Powering Analyzer from Charger ............................................6
2.13 Troubleshooting for Slow or Low Readings (2820).................. 6
2.14 Testing Incubators (2820)......................................................... 7
3.0 MAINTENANCE .................................................................................8
3.1 Cleaning.......................................................................................8
3.2 Sunlight .......................................................................................8
3.3 Servicing ......................................................................................8
3.4 Software Version / Serial Number .............................................8
3.5 Factory Settings .......................................................................... 8
3.6 Battery Charging ........................................................................ 9
3.7 Calibration.................................................................................10
3.7.1 2810/2815 Calibration Procedure ................................10
3.7.1.1 Air Calibration .............................................. 10
3.7.1.2 Gas Calibration ............................................. 12
3.7.2 2820 Calibration Procedure .........................................14
3.7.2.1 N2Calibration ...............................................14
3.7.2.2 Gas Calibration ............................................. 15
4.0 PARTS & SERVICE .........................................................................18
4.1 Replacement Parts and Accessories......................................... 18
4.2 Bacharach Service Centers.......................................................19

CO2Analyzer 2810/2815/2820
Instruction 19-9222
ii
Notes:

CO2Analyzer 2810/2815/2820
Instruction 19-9222 1
1.0 INTRODUCTION
1.1 General
Bacharach’s line of CO2Analyzers are easy to use, but it is essential that
these Operating Instructions be read and understood by all operators
and maintenance personnel prior to using or servicing the instrument.
The 2810/2815/2820 are compact and lightweight Carbon Dioxide an-
alyzers that display the detected level of CO2in the range of either
0–10,000 ppm (2810/2815) or 0–60% (2820). The analyzer is based on
the infrared-absorption principle to detect the presence of CO2. The 2810
operates by diffusion only, while the 2815/2820 incorporates an internal
pump for drawing in gas samples. Simply turn off the pump and the
2815/2820 samples by diffusion. A sampling tube and particulate lter
are included with the 2815/2820 for remote sampling, while the 2820
also includes a desiccant lter to be used when sampling areas with high
humidity. All analyzers can store gas readings in memory, which can
later be downloaded to a personal computer via its integral IrDA commu-
nications link and the optional BACH-COM software.
1.2 Main Features
•Sampling modes:
sample draw (2815/2820) and/or diffusion (2810/2815/2820)
•Automatic compensation for elevation and changes
in barometric pressure
•Variable-pitch tone indicates CO2level (2815/2820)
•Integral pump (2815/2820)
•Battery capacity display
•Manual (snapshot) and continuous data logging of readings
with time and date stamp
•Memory capacity for approximately 100 snapshot readings and
800 sets of continuous data logged readings
•IrDA link for downloading stored data to a personal computer
•Easy calibration in fresh air
•Run-while-charging capability
1.3 Units of Measurement
Depending the model ordered, the instruments’s LCD shows CO2concen-
trations in either parts-per-million (2810/2815) or percent (2820). Please
note that 1% = 10,000 ppm, and 0.01% = 100 ppm.

CO2Analyzer 2810/2815/2820
Instruction 19-9222
2
2.0 OPERATION
2.1 Important Note
Always ensure that the analyzer’s gas inlet connector (Figure 1, Item C)
and gas exhaust (Figure 1, Item B) are unobstructed and open to the at-
mosphere. Be careful not to breath directly on the analyzer while taking
a measurement; otherwise, inaccurate CO2readings will result.
2.2 Switching the Analyzer ON/OFF
Switch ON the analyzer by pressing the button. Switch the analyzer
OFF by pressing the button down for at least 3 seconds, or until the
display goes blank. When rst switched on, there is a warm-up period be-
fore the CO2level is displayed – approximately 60 seconds for the 2810/
2815 analyzer, and 20 seconds for the 2820. Note that a normal fresh-air
background reading of CO2is approximately 340 ppm.
CO2
ANALYZER
ppm CO2
340
% CO2
00.04
Figure 1. Components of the CO2Analyzer
A - Digital display
B - Gas exhaust
C - Gas inlet connector
D - IrDA link
E - Pump ON light
F - Power ON/OFF (2810/2815/2820);
pump ON/OFF (2815/2820)
G - Battery charging socket
H - Store readings (f1)
I - Battery status / calibrate (f2)
J - Backlight (2810/2815/2820);
Audible tone indicating CO2level
(2815/2820) (f3)
and
then or
2
3
B
A
J
I
H
C
D
E
F
G

CO2Analyzer 2810/2815/2820
Instruction 19-9222 3
2.3 Pump Operation (2815/2820)
With the analyzer already switched on, momentarily pressing the but-
ton switches on the pump. Pressing the button again turns the pump
off. The supplied sampling probe and hose assembly can be connected
to the gas inlet connector on the top of the analyzer for drawing in gas
samples from hard-to-reach locations.
Particulate lter P/N 54-0548 is placed on top of the gas inlet to prevent
dust or dirt from being drawn into the instrument. Replace the par-
ticulate lter about once a month, or when the lter is contaminated as
evidenced by a slower response time.
Note that the combined sampling hose and probe length should not
exceed 6 feet (1.8 m). Also note that the pump is intended for use only at
normal atmospheric pressure, and is not designed to draw in gas samples
against a vacuum or an obstruction such as a kink in the sampling hose.
If an obstruction or negative-pressure gradient is present, then gas will
not be drawn into the analyzer. Please consult the factory for applica-
tions where longer sampling lengths are required, or where it is neces-
sary to draw against a vacuum.
2.4 Pump Contamination (2815/2820)
Over time the pump can become contaminated, leading to a slower
response time and lower readings. To check for pump contamination,
turn on the pump and hold your index nger over the inlet tting. The
pump should normally stall. If the pump, however, continues to run,
then the pump is contaminated and the analyzer needs to be returned to
Bacharach for repair.
2.5 High Humidity Gas Sampling (2820)
When using the 2820 to draw in gas samples from areas with high levels
of humidity (e.g., incubators), rst install the small round particulate
lter that is supplied with the instrument onto the analyzer’s outlet us-
ing a 1.5" section of Portex tubing, and then connect a lure tting to the
particulate lter. Next, connect the Naon tubing that is also supplied
with the analyzer to the luer tting using a 2" section of Portex tubing.
On the other end of the Naon tubing use a 6 to 12" section of Portex tub-
ing to connect to the incubator. See Figure 2.
Note: If the supplied Portex tubing is too small to t onto the
incubator’s gas sample port, then substitute a larger diameter
tubing of your choice as long as the tubing is nonabsorbent.

CO2Analyzer 2810/2815/2820
Instruction 19-9222
4
For those situations where water droplets may be present in the sample
line, you will need to install a water trap between the Naon tubing and
the incubator’s sample port as described in Section 2.14.
After completing a test, continue to run the pump while sampling fresh
air until the reading is below 0.1. This will purge out any residual CO2
and moisture before proceeding to the next test.
2.6 Storing Readings
There are two reading-storage modes available:
• Snapshot
• Continuous Data Logging
Pressing the f1button once stores (takes a snapshot of) the reading
shown on the display.
Pressing and holding down the f1button for at least 2 seconds starts the
continuous data logging of the readings at a preset interval (factory set
at 30 seconds).
The analyzer can store up to 100 snapshot readings and 800 sets of
continuous-data-logged readings. Once the storage capacity has been
exceeded, the latest readings will overwrite the oldest stored data.
The stored data can be downloaded to a personal computer using the
analyzer’s IrDA link and the optional BACH-COM software. This soft-
ware can also be used to alter the data-logging interval, and produce
tables and plots of time-based CO2readings.
2.7 Battery Low Display
When the battery voltage falls below a pre-determined level, the display
will alternate between its normal gas display and
In addition, the beeper will emit three rapid notes every 30 seconds. At this time
the analyzer should be given a full charge per Section 3.6 as soon as possible.
BattLow
340
ppm CO2
340
Clock icon is displayed once for
a snashot, and ashes during
continuous logging.

CO2Analyzer 2810/2815/2820
Instruction 19-9222 5
2.8 Battery Charge Display
The battery’s remaining charge is displayed by pressing the f2button
once. A bar graph in the lower part of this screen shows an approxi-
mation of the battery’s remaining charge. As the charge reduces, the
bar graph decreases in size. Typical operating time from a full charge is
7 hours with the pump running, and 10 hours with the pump off.
2.9 Backlight
To view the LCD in poor ambient lighting conditions, turn on the dis-
play’s backlight by pressing the f3button once (with the analyzer on).
The backlight stays on for 5 seconds and then automatically turns off.
2.10 Audible Gas-Level Tone (2815/2820)
An audible tone, which will increase in pitch with increasing CO2levels,
is activated by pressing and holding down the f3button for 3 seconds.
The tone is turned off by again pressing and holding down the f3button
for 3 seconds.
2.11 Fault Condition Warning
The analyzer is capable of alerting the operator of an internal fault
condition (i.e., a sensor failure or blockage in the infrared path). If a fault
occurs, the analyzer’s beeper will sound continuously, and the following
message is displayed until the analyzer is turned off.
If the fault warning is displayed at any time, then the analyzer must be
returned to Bacharach for servicing.
FAULT
= represents low charge= represents full charge
Battery
Level

CO2Analyzer 2810/2815/2820
Instruction 19-9222
6
2.12 Powering Analyzer from Charger
The analyzer can be continuously powered by its charger by connecting
the charger as follows:
1. Switch ON the analyzer without the charger attached.
Note: Connecting a charger to an analyzer that is switched
OFF causes the analyzer to enter its charging mode, which in
turn prevents the analyzer from being switched ON.
2. Plug the charger into the appropriate AC wall socket (or 12 VDC when
using the optional cigarette lighter adapter). Then plug the charger’s
output connector into the analyzer’s charging socket (Figure 1,
Item G).
The analyzer will now continuously run until it is switched OFF.
2.13 Troubleshooting for Slow or
Low Readings (2820)
It normally takes between 1 and 2 minutes to obtain a peak reading
when testing an incubator. A slow or low reading can be caused by either
a clogged desiccant lter or a contaminated CO2sensor. Do the following
to test for slow or low readings:
1. Remove both lters and sample again.
2. If this cures the problem, rst replace the desiccant lter
(P/N 07-1645) and sample again. Note that the particulate lter rarely
becomes clogged, but if the problem returns with both ters installed,
replace the particulate lter (P/N 54-0548).
3. If the problem persists with the lters removed, reset the instrument
to the factory settings per Section 3.5. If the reset is OK, then calibrate
the instrument per Section 3.7.2.
4. If the factory reset fails, the CO2sensor is contaminated and the in-
strument needs to be returned to Bacharach for repair and calibration.

CO2Analyzer 2810/2815/2820
Instruction 19-9222 7
2.14 Testing Incubators (2820)
When testing incubators with the Model 2820, it is important to keep
moisture from entering the instrument. Moisture can contaminate the IR
cell and affect the readings.
A Gas Dryer Tube (Naon) is supplied with the instrument to remove
excess water vapor (humidity) – refer to Section 2.5. The Naon tube
must be used at all times when testing in high humidity environments.
When testing water-jacketed incubators, however, the potential exists of
drawing water droplets that form inside the incubator’s internal sample
line through the Naon tubing and into the instrument. A water trap is
provided with the instrument as an accessory to prevent water from be-
ing drawn into the instrument. The water trap is installed between the
incubator and the Naon tubing as shown in Figure 2.
The need for the water trap can be determined by taking a few tests with
it connected as described above. If water does not accumulate within
the trap, then discontinue its use and just use the Naon tubing. If the
Naon tubing becomes contaminated with water droplets, dry it out by
ushing the tubing with a dry gas such as N2. Naon tubing requires no
other maintenance.
Figure 2. Installation of Naon Tubing & Water Trap
2
3
INCUBATOR
6 to 12"
PORTEX TUBING
2"
PORTEX TUBING
1.5"
PORTEX TUBING
WATER TRAP
(Note direction of arrow)
Important! Remove particulate
filter element from inside of
water trap
NAFION
TUBING
PARTICULATE FILTER
LUER FITTING
Screws onto Particulate Filter

CO2Analyzer 2810/2815/2820
Instruction 19-9222
8
3.0 MAINTENANCE
3.1 Cleaning
Keep the analyzer clean by wiping it with a soft cloth dampened with a
mild detergent solution.
3.2 Sunlight
The unit should not be left out in direct sunlight, or in other areas where
excessive heat exists, for long periods since component damage due to
overheating may result.
3.3 Servicing
There are no user-serviceable parts inside the analyzer. Unauthorized
disassembly of the unit will invalidate the warranty.
3.4 Software Version / Serial Number
With the analyzer switched OFF, and while holding down the f1button,
switch ON the analyzer to display its software version and issue date.
Releasing the f1button displays the analyzer’s ID number for 5 seconds.
3.5 Factory Settings
Important! The analyzer should only be returned to its fac-
tory settings when advised by a Bacharach Service Repre-
sentative.
With the analyzer switched OFF, and while holding down the f2button,
switch ON the analyzer. The display will show
Keep the f2button depressed until the display shows
Cd v1.24
20/5/98 ID No. xxxxx
RESET OK
FACTORY
SETTINGS
→

CO2Analyzer 2810/2815/2820
Instruction 19-9222 9
Release the f2button and follow the instructions from your local service
representative.
WARNING: After resetting the analyzer to its factory settings,
it must be calibrated as described in Section 3.7 or erroneous
gas reading may result.
3.6 Battery Charging
When the ‘BattLow’ message is displayed (refer to Section 2.7), the ana-
lyzer must be recharged using the supplied battery charger.
Important! The battery has a long shelf life, but it is recom-
mended that the battery be recharged once a month if
left unused. Batteries that have not been charged for several
months should be given at least two charge/discharge cycles
before using the analyzer.
As with all rechargeable batteries, there are guidelines that should be
observed: The battery should normally be charged at room temperature.
Charging at temperatures below 54 °F (12 °C) should be avoided since
this may cause a false indication of when the battery is charged, and
could also damage the battery.
Before beginning the charging process, rst ensure that the analyzer is
switched OFF. Next, plug the supplied charger into the appropriate AC
wall socket (an optional 12 VDC charger with cigarette lighter adapter is
also available). Then plug the charger’s output connector into the ana-
lyzer’s charging socket (Figure 1, Item G).
The word “CHARGING” appears while the battery is being charged.
Charging time is approximately 2 hours.
Note: If the battery is deeply discharged, the display will
remain blank for a few minutes before the battery begins
charging.
Once the battery is fully recharged, the analyzer will emit a beeping tone
for 30 seconds and display the word “CHARGED”. At this time unplug
the charger and remove its output connector from the analyzer.
CHARGING
>>>>>>>> CHARGED
→

CO2Analyzer 2810/2815/2820
Instruction 19-9222
10
3.7 Calibration
Calibration of a 2810/2815/2820 CO2 Analyzer consists of rst performing
either an Air Calibration on a 2810/2815 analyzer that zeros the instru-
ment using fresh ambient air, or an N2Calibration on a 2820 analyzer
that zeros the instrument using 100% N2.
Factory calibration provides the best accuracy over the analyzer’s entire
detection range; however, the user can perform the optional Gas Cal-
ibration procedure that will improve the analyzer’s accuracy at a pre-
programmed calibration point of 2,500 ppm CO2for the 2810/2815, and
5% CO2for the 2820. Note that the pre-programmed calibration point can
be changed using BACH-COM software version 2.22 or higher.
It is recommended that an Air Calibration or N2Calibration be per-
formed at the beginning of each work day or each time the instrument
is switched OFF/ON. The analyzer should also be checked on a periodic
basis with a higher concentration of CO2to ensure that it still meets its
accuracy specication.
Follow the procedure under Section 3.7.1 to calibrate a 2810/2815 Low
Range (LR) Analyzer, or the procedure under Section 3.7.2 to calibrate a
2820 High Range (HR) Analyzer.
3.7.1 2810/2815 Calibration Procedure
3.7.1.1 Air Calibration
Perform this procedure in an uncontaminated enviroment such as out-
side fresh air, an empty room, or corridor where the air is assumed to
contain 340 ppm CO2.
Important! DO NOT perform an air calibration after sam-
pling high concentrations of CO2gas. Also, be careful that
your breath does not affect this procedure.
1. Switch ON the analyzer, and then allow it to sample fresh air for
5 minutes. During this time, the internal pump of a 2815 Analyzer
should be turned OFF.
→
CO2 LR ppm CO2
Analyzer 340

CO2Analyzer 2810/2815/2820
Instruction 19-9222 11
2. Press and hold down the f2button until the ‘User Cal’ screen is dis-
played. Note that battery status is rst displayed for approximately
2 seconds.
User Cal
Wait until the analyzer automatically switches to its ‘Air/Gas’ screen
before proceeding.
f1-> Air
f3-> Gas
3. Press the f1button to zero the analyzer using fresh ambient air. If the
air calibration procedure was successful, the display will show
AirCal
OK
If the procedure was unsuccessful, the message
AirCal
Failed
will be displayed. If this happens, retry the Air Calibration procedure,
ensuring that the analyzer is only exposed to fresh air. If the pro-
cedure is still unsuccessful, then the analyzer must be returned to a
Bacharach Service Center for evaluation.
4. This completes the Air Calibration procedure. If desired the analyzer
can now be spanned to a known concentration of CO2gas per Section
3.7.1.2.

CO2Analyzer 2810/2815/2820
Instruction 19-9222
12
3.7.1.2 Gas Calibration
WARNING: This procedure assumes that you are using the
Bacharach Calibration Kit as listed in Section 4.1, Calibration
Accessories. When using a non Bacharach gas regulator,
however, you must also use an in-line owmeter to ensure that
the gas ow to the analyzer is between 100 and 200 cc/minute.
Improper ow can cause erroneous gas readings!
Important! Always perform an Air Calibration rst.
1. Press and hold down the f2button until the ‘User Cal’ screen is dis-
played.
User Cal
Wait until the analyzer automatically switches to its ‘Air/Gas’ screen
before proceeding.
f1-> Air
f3-> Gas
2. Press the f3button to display the Gas Calibration screen.
f1> 2500
340
The top line shows the preset calibration gas value that must be ap-
plied to the analyzer’s inlet. The bottom line shows the current CO2
reading.
Note: The analyzer is most accurate around the calibration
gas value. If the analyzer, however, is routinely used to moni-
tor CO2levels that are much higher or lower than the preset
value, then it is recommended that the analyzer be calibrated
on a concentration of gas that is close to the gas level being
monitored. This operation requires that the preset calibration
gas value be reset higher or lower using the optional BACH-
COM software, version 2.22 or higher.

CO2Analyzer 2810/2815/2820
Instruction 19-9222 13
3. Using the Calibration Accessories listed in Section 4.1, attach a CO2
calibration gas cylinder to the inlet of the analyzer as shown in Fig-
ure 3. The applied CO2concentration must equal the gas value dis-
played in the top line of the Gas Calibration screen.
Important! Do not attempt to calibrate the analyzer if the
pressure gauge closest to the tank reads below 5 psi.
4. Adjust the regulator attached to the gas cylinder for an outlet pressure
of 2 psi (equivalent to a ow rate of approximately 120 cc/minute).
Observe that the gas level displayed on the second line of the Gas
Calibration screen should slowly rise to the value displayed in the top
line.
5. Allow the calibration gas to ow until the second line of the Gas Cali-
bration screen stabilizes, then press the f1button.
If the gas calibration procedure was successful, the display will show
GasCal
OK
If the procedure was unsuccessful, the message
GasCal
Failed
will be displayed. If this happens, retry the Gas Calibration procedure,
ensuring that the analyzer is exposed to the correct concentration of
calibration gas. If the procedure is still unsuccessful, then the analyzer
must be returned to a Bacharach Service Center for evaluation.
6. This completes the Gas Calibration procedure. Shut off the regulator;
then remove and store the calibration accessories.

CO2Analyzer 2810/2815/2820
Instruction 19-9222
14
3.7.2 2820 Calibration Procedure
3.7.2.1 N2Calibration
The following procedure uses 100% N2to zero the analyzer. (Fresh ambi-
ent air that is assumed to contain 340 ppm CO2can be used if N2is not
available.)
Important! DO NOT perform an N2calibration after sam-
pling high concentrations of CO2gas. Also, be careful that
your breath does not affect this procedure.
1. Switch ON the analyzer. But before proceeding, allow the analyzer to
sample fresh air for 5 minutes with its internal pump turned OFF.
CO2 HR % CO2
Analyzer 00.00
2. Press and hold down the f2button until the ‘User Cal’ screen is dis-
played. Note that battery status is rst displayed for approximately
2 seconds.
User Cal
Wait until the analyzer automatically switches to its ‘N2/Gas’ screen
before proceeding.
f1-> N2
f3-> Gas
3. Using the calibration accessories listed in Section 4.1, attach a 100%
N2gas cylinder to the inlet of the analyzer as shown in Figure 3. Then
adjust the regulator attached to the gas cylinder for an outlet pressure
of 2 psi (equivalent to a ow rate of approximately 120 cc/minute). If
N2is unavailable, turn ON the analyzer’s pump and allow it to draw
in fresh air for at least 30 seconds before proceeding.
Important! When using N2gas, do not attempt to calibrate the
analyzer if the pressure gauge closest to the tank reads below
5 psi.
→

CO2Analyzer 2810/2815/2820
Instruction 19-9222 15
4. Press the f1button to zero the analyzer using 100% N2or fresh air. If
the N2Zero procedure was successful, the display will show
N2 Cal
OK
If the procedure was unsuccessful, the message
N2 Cal
Failed
will be displayed. If this happens, retry the N2Zero procedure, en-
suring that the analyzer is only exposed to either 100% N2or fresh
air. If the procedure is still unsuccessful, then the analyzer must be
returned to a Bacharach Service Center for evaluation.
5. This completes the N2Calibration procedure. If desired the analyzer
can now be spanned to a known concentration of CO2gas per Section
3.7.2.2.
3.7.2.2 Gas Calibration
WARNING: This procedure assumes that you are using the
Bacharach Calibration Kit as listed in Section 4.1, Calibration
Accessories. When using a non Bacharach gas regulator,
however, you must also use an in-line owmeter to ensure that
the gas ow to the analyzer is between 100 and 200 cc/minute.
Improper ow can cause erroneous gas readings!
Important! Always zero the analyzer rst using 100% N2or
fresh ambient air.
1. If the pump is running, turn it OFF.
2. Press and hold down the f2button until the ‘User Cal’ screen is dis-
played.
User Cal

CO2Analyzer 2810/2815/2820
Instruction 19-9222
16
Wait until the analyzer automatically switches to its ‘N2/Gas’ screen
before proceeding.
f1-> N2
f3-> Gas
3. Press the f3button to display the Gas Calibration screen.
f1->05.0
00.0
The top line shows the preset calibration gas value that must be ap-
plied to the analyzer’s inlet. The bottom line shows the current CO2
reading.
Note: The analyzer is most accurate around the calibration
gas value. If the analyzer, however, is routinely used to moni-
tor CO2levels that are much higher or lower than the preset
value, then it is recommended that the analyzer be calibrated
on a concentration of gas that is close to the gas level being
monitored. This operation requires that the preset calibration
gas value be reset higher or lower using the optional BACH-
COM software, version 2.22 or higher.
4. Remove the 100% N2cylinder (if used); then attach a CO2calibration
gas cylinder to the inlet of the analyzer as shown in Figure 3. The ap-
plied CO2concentration must equal the gas value displayed in the top
line of the Gas Calibration screen.
Important: Do not attempt to calibrate the analyzer if the
pressure gauge closest to the tank reads below 5 psi.
5. Adjust the regulator attached to the gas cylinder for an outlet pressure
of 2 psi (equivalent to a ow rate of approximately 120 cc/minute). Ob-
serve that the gas level displayed on the second line of the Gas Calibra-
tion screen should slowly rise to the value displayed in the top line.