AIR SYSTEMS CO2-91IS User manual

C US

®
INTRINSICALLY SAFE, CLASS I
DIVISION I, GROUPS C AND D
1072398
OPERATING INSTRUCTIONS AND REPLACEMENT PARTS
Models: CO2-91IS and CO2-91ISLA
AIR SYSTEMS INTERNATIONAL, INC.
829 Juniper Crescent, Chesapeake, Va, 23320
Telephone [phone]
Toll Free 1-800-866-8100
Fax No. [phone]
www.airsystems.com.
e-mail: [email protected]
This manual must be read carefully and followed by all persons who have or will have the responsibility
for using or servicing this equipment. This equipment will perform as designed only if used according
to the instructions. Otherwise it could fail to perform as designed, causing personal injury or death.
WARNING

2
Air Systems’ manufactured equipment is warranted to the original user against defects in workmanship or materials under
normal use for one year from the date of purchase. Any part which is determined by Air Systems to be defective in mate-
rial or workmanship will be, as the exclusive remedy, repaired or replaced at Air Systems’ option. This warranty does not
apply to electrical systems or electronic components. Electrical parts are warranted, to the original user, for 90 days from
the date of sale. During the warranty period, electrical components will be repaired or replaced at Air Systems’ option.
NO OTHER WARRANTY, EXPRESSED OR IMPLIED, AS TO DESCRIPTION, QUALITY, MERCHANTABILITY, FIT-
NESS FOR A PARTICULAR PURPOSE, OR ANY OTHER MATTER IS GIVEN BY AIR SYSTEMS IN CONNECTION
HEREWITH. UNDER NO CIRCUMSTANCES SHALL THE SELLER BE LIABLE FOR LOSS OF PROFITS, ANY OTHER
DIRECT OR INDIRECT COSTS, EXPENSES, LOSSES, OR DAMAGES ARISING OUT OF DEFECTS IN, OR FAILURE
OF THE PRODUCT OR ANY PART THEREOF.
The purchaser shall be solely responsible for compliance with all applicable Federal, State and Local OSHA and/or MSHA
requirements. Although Air Systems International believes that its products, if operated and maintained as shipped from
the factory and in accordance with our “operations manual”, conform to OSHA and/or MSHA requirements, there are no
implied or expressed warranties of such compliance extending beyond the limited warranty described herein. Product
designs and specifi cations are subject to change without notice. Rev. 2, 12/98
Air leaks are not covered under warranty except when they result from a defective system component, i.e. an on/off valve
or regulator or upon initial delivery due to poor workmanship. Air leaks due to poor delivery or damage will be covered un-
der delivery claims. Minor air leaks are part of routine service and maintenance and are the responsibility of the customer
just as are fi lters and oil changes.
Warranty

3
SYSTEM MAINTENANCE
Filter Housing/Bowls: Periodic cleaning of the polycarbonate bowls may become necessary. Remove the auto drains and
clean the bowls with a mild soapy solution. The auto drains may also be cleaned with a mild soapy solution at this time.
Dry and reinstall into the fi lter housing.
Filter Change: The fi ltration system consists of fi lter change indicators which will gradually change from green to orange
when fi lter life is spent.
Note: Air must be fl owing through the fi lters before the fi lter change indicators will function. With system pressurized, close
inlet ond outlet ball valves. Release the fi lter trio pressure by pressing the manual drain assembly to the side. Remove the
bowl assemblies by releasing the lock ring.
Calibration: Monitor calibration should be done monthly or whenever the reading may be questionable. A calibration date
sticker should be affi xed for future reference. To obtain an accurate calibration, we recommend the use of Air Systems’
calibration kits.
Part Number:
BBK-10 Canadian calibration kit for CO monitor; 10ppm CO, zero air, regulator and case - 17 liter size.
BBK-20 Calibration kit for CO monitor; 20ppm CO, zero air, regulator and case - 17 liter size.
BBK-20103 Calibration kit for CO monitor; 20ppm CO, zero air, regulator and case - 103 liter size.
BBG-O2 Oxygen sensor test gas, 20.9% oxygen - 17 liter size.
DECAL085CD Calibration decal, sold in sheet of 14.
To assure sensor accuracy, calibration of monitor is required. If you cannot obtain an accurate calibration, sensor replace-
ment may be necessary. Consult Repair Service Department before ordering.
Part Number:
CO-91NS Replacement CO sensor
CO2-O2 Replacement O2 sensor
CAUTION: Always depressurize the system before performing service.
The monitor will analyze the air sample and display the oxygen % and CO concentration in parts per million (ppm). The
system’s green “NORMAL” operation light will illuminate and the red “HIGH CO” light will fl icker approximately every sec-
ond when the CO level is below 10ppm (5ppm Canadian) and the oxygen level is above 19.5%. If the CO concentration
level exceeds the alarm set point, the green “NORMAL” light will turn off, the red “HIGH CO” light will illuminate, and the
audible alarm will sound. Once the CO concentration levels drop below the alarm set point, all alarm indicators will deac-
tivate and the unit will return to “NORMAL” operation. If oxygen levels drop below 19.5%, the green “NORMAL” light will
turn off, the red “LOW O2” light will illuminate, and the audible alarm will sound. Once the oxygen levels exceed 19.5%, all
alarm indicators will deactivate and the unit will return to “NORMAL” operation.
Carbon Monoxide/Oxygen Monitor System Components
Carbon Monoxide/Oxygen Monitor Specications
Maintenance Items
Size 2.75”H X 9.8”L X 5.1”W
Weight 3.2 lBS. (1.45kg.)
Case Extruded Aluminum
Anodized Black
Voltage
9 VDC
(9 Volt Batteries Only -
Intrinsically Safe)
Shielding Internal RFI/EMI fi lters
Operating
Temperature
4° to 113° Fahrenheit
(-15.5° to 45° Celcius)
Humidity
Range 10% to 90% relative humidity
Flow
Requirement 50 - 100 cc/min
Display 3 digit LCD - CO concentration
3 digit LCD - O2 percentage
Test Circuit Manually activated
Sensor Type Sealed electrochemical sensors for
Carbon Monoxide and Oxygen
Accuracy +/-1% full scale
Response 90% in 10-15 seconds
Detectable
Range
0-200 ppm CO
15-23% O2
Calibration Manual CO zero and span adjustments
Manual O2 adjustment
Alarm Setting 10 ppm CO (5 ppm - Canadian)
19.5% O2
Warning
Signals
Normal Operation - Green Light
High CO - Red Light
High CO/Low O2 - Audible Alarm
Low O2 - Red Light
Low Battery - Amber Light
Warranty 2 years from original date of purchase for
monitor and CO sensor, 1 year on O2 sensor

4
NOTE: Model CO2-91IS has the indicator lights and audible alarm mounted on bottom of housing and Model CO2-91ISLA
has the indicator lights mounted on top of housing with the audible alarm being mounted on the left endplate.
Carbon Monoxide/Oxygen Monitor System Components

5
ITEM # DESCRIPTION PART #
1 LCD Display MONC703
2Span Poten ometer MONC702A
3Alarm Set Point Poten ometer MONC702A
4Zero Poten ometer MONC702
5 Air Sample Inlet Socket MONC001
6 Air Sample Plug MONC002
7 Air Exhaust Port MONC003
8On/Off /Test Switch MONC007
9 CO2-91IS/CO2-91ISLA Faceplate Assembly CO2-91EXFP
10 Faceplate/Endplate Screw MONC023
11 Main Circuit Board Assembly CO2-91IPCB
12 Power Supply Board CO2-91EXPS
13 Ba ery Box Connector (Soldered To PCB) MONC516
14 PPM/Serial No. S cker MONC031
15 Ba ery Box MONC006
16 9 Volt Ba ery ELB9V
17 Calibra on Tool MONC028
18 End Plate CO-91BEP
19 Audible Alarm (CO2-91ISLA) ELLS004IS
20 Aluminum Housing MONC021A
21 Led Socket MONC009LA
22 Yellow LED MONC008NS
23 LED Socket And Yellow LED CO-91LED
24 Red LED (CO2-91ISLA) MONC035NS
25 Green LED (CO2-91ISLA) MONC036NS
26 Oxygen % Decal DECAL051
27 CO Sensor Connector (Soldered To PCB) MONC509
28 O2 Sensor Connector (Soldered To PCB) MONC511
29 LED Connector (Soldered To PCB) MONC511
30 CO Sensor CO-91NS
31 CO Sensor Holder MONC810
32 CO Sensor Electrical Leads CO-91SL
33 90° Hose Barb MONC811
34 O2 Sensor CO2-O2
35 O2 Sensor Holder MOCAPREM
36 O2 Sensor Electrical Leads CO2-91SL
37 Audible Alarm (CO2-91IS) ELLS008
38 Lamp Socket (CO2-91IS) ELDS004
39 Clear Lens (CO2-91IS) ELDS013
40 Red LED (CO2-91IS) MONC004
41 Green LED (CO2-91IS) MONC005
Carbon Monoxide/Oxygen Monitor System Components

6
SENSOR REPLACEMENT
Replacement CO sensors are shipped with a metal clip installed between the electrodes. Do not remove the clip until the
sensor is to be installed in the monitor. O2 sensors do not require a clip installed between the electrodes.
STEP 1)
Disconnect all external connec-
tions and remove CO/O2 monitor
from the unit.
STEP 2)
Remove the four screws from the mon-
itor’s left endplate.
STEP 3)
Remove endplate to gain access to the
sensor cups.
STEP 4)
Remove sensor from sensor cup and remove leads. Take the new
sensor and remove the metal clip (CO sensor only). Reattach leads
to the proper colored terminals on the new sensor. Install new sensor
into sensor cup. O2 sensor connections are as follows: grey lead -
positive, white lead - negative.
STEP 5)
Reassemble monitor and reinstall in unit.
Connect all cables and air sample hose. Al-
low monitor to stabilize 30 minutes to 1 hour
and recalibrate.
UNUSED
CONTROL
(BLACK)
SENSING
(RED)
REFERENCE
(BLUE)
CO SENSOR
O2 SENSOR
CO SENSOR
Sensor Replacement

7
CALIBRATION PROCEDURE
Do not use inert gases to zero the monitor. This will cause premature failure of the sensor.
CO/O2 Monitor Zero Adjustment
To zero the monitor, follow the steps below. Zero calibration gas should be used to properly “zero” the monitor
and assure that a valid calibration is achieved. If zero adjustment cannot be made as indicated, sensor replacement may
be necessary. After each monitor adjustment outlined in the steps, allow time for the changes to stabilize.
STEP 1)
Place the “ON/OFF/TEST” switch in the “ON” position.
STEP 8)
Allow digital readout to stabilize approximately 15-30
seconds.
STEP 10)
Turn the regulator off and disconnect the regulatorfrom
the zero gas cylinder.
STEP 2)
Allow 30 seconds for the readout to stabilize. The green
indicator will illuminate.
STEP 3)
Hold the “ON/OFF/TEST” switch in the “TEST” position.
The following will occur:
Audible alarm will sound
“LOW O2” and “NORMAL” indicators blink
together and alternate with the “HIGH CO”
indicator.
Amber “LOW BATTERY” indicator on monitor
will illuminate.
This test ensures the circuitry is operable and continuity
to the sensor is proper. Release the switch.
STEP 4)
Remove the air sample inlet tube.
STEP 5)
Install regulator on the zero air cylinder reference gas.
STEP 7)
Attach the clear tubing with the male plug to the air sam-
ple inlet on the monitor.
STEP 6)
Turn the knob on the regulator counterclockwise to allow
the fl ow of gas thru the hose. Verify fl ow of gas thru the
hose via touch or sound.
STEP 9)
Adjust the “zero” adjustment screw (clockwise to increase
or counterclockwise to decrease) until a reading of “00” is
obtained.
Calibration Procedure

8
CALIBRATION PROCEDURE
CO/O2 Monitor Span Adjustment
Use only 10-20ppm CO gas for calibration. Using a higher concentration may decrease accuracy at lower scale
readings. Note: 10ppm gas must be used to satisfy Canadian calibration requirements.
STEP 1)
Install regulator on the CO calibration gas cylinder.
STEP 3)
Connect the plug to the air sample inlet on the monitor.
STEP 2)
Turn the knob on the regulator counterclockwise to allow
the fl ow of gas thru the hose. Verify fl ow of gas thru the
hose via touch or sound.
STEP 4)
Allow digital readout to stabilize 15-30 seconds.
STEP 5)
Adjust the “span” adjustment screw (clockwise to in-
crease or counterclockwise to decrease) until the digital
readout reads the same as the concentration (ppm) as
printed on the calibration gas cylinder.
STEP 6)
Turn the regulator off and repeat the “zero” adjustment
procedure. The digital readout should return to a “00”
reading.
The monitor is now calibrated and should be recalibrat-
ed monthly or if accuracy is questionable. Check local
requirements and recalibrate as required.
O2 Sensor Adjustment
STEP 7)
Make sure the monitor is not located in an oxygen defi -
cient atmosphere during testing. Using Air System’s P/N
BBG-O2, 20.9% oxygen test gas, repeat steps 1-4. Turn
the “O2 ADJ.” screw until a reading of 20.9% is achieved.
To test the low O2 alarms, turn “O2 ADJ.” screw until dis-
play reads approximately 19.5%. When fi nished testing
alarms reset to 20.9%.
Note: Normal ambient oxygen level is 20.9%
Calibration Procedure

9
Notes:

10
Notes:

11
Notes:

AIR SYSTEMS INTERNATIONAL, INC.
829 Juniper Crescent, Chesapeake, Va, 23320
Telephone [phone]
Toll Free 1-800-866-8100
Fax No. [phone]
http://www.airsystems.com
e-mail: [email protected]
Printed in the U.S.A. ©Copyright Air Systems International, Inc. 2018 All Rights Reserved
Manual No. MON020
Rev. 3 May 2018