SenseAir aSENSE m III CO2 / CO sensor Function Description and Maintenance Instruction

Function Description and Maintenance Instruction
aSENSE™ m III
CO2 / CO sensor with built-in general purpose
controller
General
The IAQ-sensor product aSENSE™ m III is used to measure indoor air carbon dioxide
and carbon monoxide concentrations. It is a very flexible controller with programmable
outputs for both relay- and linear control of e.g. mixed air dampers, humidifier and fans. The
measured values are shown on the display.
The unit can alternatively be connected to common VAV (Variable Air Volume) controllers,
or Direct Digital Control (DDC). The linear output functions are pre-programmed. All
functions can be modified from a PC with the software UIP (version 4.3 or higher) and the
RS232 communication cable.
Figure 1. aSENSE™ m III for wall mounting and ventilation duct mounting
page 1 of 15
FUNCTIONAL DESCRIPTION
aSENSE™ m III is delivered pre-programmed (see description below). With the free
software UIP4.3 (or later versions) and SenseAir’s standard communication cable for PC
(art.no. A232 Cable) the user can adjust the product to his/hers application by, for example,
changing the measurement ranges of the linear outputs, modify the set points of the alarm
outputs, invert outputs and also reconfigure the functions and the logic that controls the
outputs.
OUT1 = CO
Start point
OUT2 = CO2
OUT3 =
Gas alarm relay
OUT4 = Sum alarm
Figure 2. Print screen of UIP4.3 PC work space of aSENSE™ m III where the pre set functions can
easily be redefined. The four outputs (far right) are here arranged in rows together with the function
blocks that control the output.
CO (ppm)
100,0
CO2(ppm 1 300
CO (ppm)
CO2(ppm)
90,0
1 200
80,0
1 100
70,0
1 000
60,0
900
50,0
800
40,0
700
30,0
600
20,0
500
10,0
400
12:00
08:00
04:00
00:00
20:00
16:00
12:00
08:00
04:00
00:00
20:00
16:00
12:00
08:00
04:00
00:00
20:00
16:00
12:00
08:00
04:00
00:00
20:00
16:00
12:00
08:00
04:00
00:00
20:00
16:00
12:00
08:00
04:00
00:00
20:00
16:00
12:00
08:00
04:00
00:00
20:00
300
16:00
-
Internal CO and CO2 recorder
samples data continuously every 20
minutes. After 13 days and 8 hours
the storage memory is full and the
oldest data are eventually overwritten
one by one. The data storage is
secured every four hours. In case of
power failure the sampled data of the
latest four hours at most will be lost.
The other values can be studied with
the software UIP4.3 and exported to a
text file for further treatment in e.g.
MS-EXCEL
page 2 of 15
Standard configuration: OUT1 is carbon monoxide output, OUT2 is carbon dioxide output
and OUT3 is relay output. OUT4 is error status OR OUT3 is open.
 OUT1 = measuring signal for carbon monoxide concentration
 OUT2 = measuring signal for carbon dioxide concentration
 OUT3 = ON/OFF of demand of air quality. The relay is open in alarm situations and at
power loss. NOTE! There is a two minutes delay after start-up.
 OUT4 = error status OR OUT3 open, carbon monoxide concentration > 35 ppm OR
carbon dioxide concentration > 1500 ppm. There is a two minutes delay after
start-up.
Figure 3. The control signal of air quality
Terminal
G+
Standard
configuration
Power (+)
Standard settings
24 VAC/DC+ (+-20%),
3W
Standard function
2W without output load
G0
Power ground (-)
24 VAC/DC-
OUT1
0-10VDC
0-100 ppm CO
The same ground reference has to be
used for the aSENSE™ m III unit
and for the control system!
Measuring signal carbon monoxide
OUT2
0-10VDC
0-2000 ppm CO2
Measuring signal carbon dioxide
M
Signal Ground (-)
Connected to G0 via PTC fuse
Relay
OUT4
Open
collector
Air control Delay two minutes after start.
Closed
< 30 ppm CO
< 1400 ppm CO2
The green LED is lit
Open
> 35 ppm CO
> 1500 ppm CO2
The relay is open in alarm situations and
at power loss. The red LED is lit and the
green is not lit.
Open
No error detected AND
normal gas
concentrations
Error status Delay two minutes after start.
Closed
Error detected OR high
gas concentrations
Table I. Default configuration of aSENSE™ m III .
The red LED is lit if an error OR high gas
concentrations are detected. If an error is
detected also the yellow LED is lit
page 3 of 15
Output Configurations
A label on the inner side of the sensor lid shows the configuration of the outputs at the time of
product delivery. The sensors/controllers are supplied from the factory (unless otherwise
ordered) with 0...10VDC linear outputs for OUT1 and OUT2. OUT4 is an open collector
output (see Table II). If different output configurations are needed for the application, these
have to be reconfigured before the unit is powered up. Default values are 0-10 V.
DI1
DI1 Switch
for alarm
test
Jumper for
configuring the
linear output
start point to 0%
or 20% start
Jumper to
choose
communication
protocol
point
Figure 4. The connection terminal area of the
Jumpers to
choose
between
voltage or
current
outputs
aSENSE™ m III
Jumper to choose
between open
collector or 0-10V
linear signal
with jumpers and terminals. The
terminal DI1 may be used for forced ventilation. If the sensor has a heater it is connected to G+ and
G0.
page 4 of 15
Jumper
Start point
selection
jumper
Communication
selection
jumper
Position Function
0%
Jumper top position provides 0Vdc or 0mA start point for OUT1, OUT2
(0-20mA or 0-10V).
20%
Jumper bottom position provides 2Vdc or 4mA start point for OUT1, OUT2
(4-20mA or 2-10V).
MB
Modbus communication protocol
SA
SenseAir communication protocol
Current
Connection in position “Current” provides 0/4-20mA output range for OUT1.
Voltage
Connection in position “Voltage” provides 0/2-10VDC output range for OUT1.
Current
Connection in position “Current” provides 0/4-20mA output range for OUT2.
Voltage
Connection in position “Voltage” provides 0/2-10VDC output range for OUT2.
Voltage
Connection in position “Voltage” provides 0-10VDC for OUT4.
Open
collector
Connection in position “Open collector” provides an open collector output.
Max 0,5A, 55VDC / 40VAC (half-wave rectifier).
OUT1
OUT2
OUT4
Table II. Configuration jumpers for aSENSE™
m III
Push Button Operation for aSENSE™ m III
This sensor has two push buttons, MENU and ESC. The YELLOW LED will acknowledge a
successful push by a short flash. The push button MENU is available for selection of display
value or maintenance commands, whereas ESC is available to escape back from a selected
level.
MENU
ESC
Figure 5. The sensor with push buttons
MENU
ESC
Figure 6. The push button MENU is pushed
page 5 of 15
MENU
MENU
ESC
ESC
Figure 7. The push button MENU is pushed
Figure 8. The ENTER command is done by
pushing buttons MENU and ESC at the
same time for about 14 seconds
Display modes
In DISPLAY MODE the DEFAULT operation is that the sensor alternates between carbon
dioxide and carbon monoxide readings presentation. The push button MENU(+) is used to
select the indicated value on the display to be the error code or the set points of temperature
and CO2 After power up the display will always return to the Default display mode. If a
permanent change of default values is requested the PC software is to be used.
Function Display
Line
Time
limit
Function description
0
CO / CO2
no
DEFAULT - Normal operation
1
Exxx
yes
Error code. If no error has been detected the code E0 is shown. The
error code is reset with Entr(+-).
2
Present CO
and CO2.
set points
no
Toggle between display of temperature and CO2 set point with
MENU(+).
Table III. On the display without entering the maintenance menu
Maintenance level
A number of execution options are available from the MAINTENANCE MENU (see Table
IV). This level is accessed only from the display mode in the set points of CO and CO2
selection. A two buttons push and an access code restricts access, intended for competent
trained service personnel only. The Entr(+-)command is done by PUSHING MENU AND
ESC AT THE SAME TIME (hold down for about 14 seconds). The access code has eight
binary digits; one press at MENU(+) equals 1 and one press at ESC(-) equals 0. The code
value can be changed for your personal choice from the software UIP 4.3.
page 6 of 15
Always use the ESC button to return to the DEFAULT mode. Several pushes of the ESC
button may be needed to return to the DEFAULT mode. The Entr(+-) push (MENU & ESC)
eventually leads to execution of functions, which causes temporary or permanently change of
any parameter, that affects the system outputs!
Function
Line
Display
Time Function description
limit
Access code to the service menu The default value of the code is
255 (=11111111, that is eight presses on MENU(+)). Press down
MENU(+) and let it scroll until it stops. The last two digits of the code
are shown. Then ENTER to accept the selected code.
For setting the set point of the CO concentration.
For increase / decrease of the CO set point. The set point is
increased by stepping with MENU(+) button. Decreasing is done by
stepping with the ESC(-) button.
For setting the set point of the CO2 concentration
3
ECxx
yes
4a
SPCO
yes
4b
The present
CO set point
yes
5a
SPc
yes
5b
The present
CO2 set point
yes
For increase / decrease of the CO2-concentration set point The
set point is increased by stepping with MENU(+) button. Decreasing
is done by stepping with the ESC(-) button.
6a
6b
AOUt
An xx
yes
no
First step of adjusting the analogue outputs MAX and MIN values
Select analogue output by stepping with MENU(+) button
6c1
SetL
no
Leads to adjustment of the MIN value.
6d1
The present
MIN value in
% of FS
no
Increase the MIN value by stepping with the MENU(+) button.
Decrease by stepping with the ESC(-) button. The output is set to
the MIN value and can be checked with a multimeter.
6e1
Sure
no
The adjustment is saved by pressing Entr(+-). Press ESC to return
without saving.
6c2
SetH
no
Leads to adjustment of the MAX value
6d2
The present
MAX value in
% of FS
no
Increase MAX value by stepping with the MENU(+) button. Decrease
by stepping with the ESC(-) button. The output is set to the MAX
value and can be checked with a multimeter.
6e2
Sure
no
7
CALb
yes
7a
Sure
yes
Confirm that a background calibration shall be done.
The adjustment is saved by pressing Entr(+-). Press ESC to return
without saving.
Background calibration of the CO sensor and the CO2-sensor
with fresh air. An easy way to correct the zero point error. The
sensor needs fresh air (380-420 ppm CO2). The calibration must be
confirmed by pressing Entr(+-). The CO2 sensor is calibrated to 400
ppm CO2 and the CO sensor to 0 ppm CO.
8
CAL
yes
Zero point calibration of the CO sensor and the CO2 sensor. The
sensor needs zero gas. See the zero point calibration instruction.
The calibration must be confirmed by pressing Entr(+-).
8a
Sure
yes
Confirm that a zero point calibration shall be done.
Table IV. Maintenance functions available on aSENSE™ m III to set output limits. Time limit
refers to an internal time-out that returns the LCD and maintenance function back to normal. ENTER is
a simultaneous pressing on MENU and ESC.
page 7 of 15
PLEASE NOTE! If a power failure happens when the sensor has OUT1...4 locked to
min/max limits, then the sensor will have this output locked when the power returns. It is
necessary to enter this menu item and release the output manually!
EXAMPLE I:
Setting of the MAX value of the analogue outputs
The access code is time limited. If the time limit is exceeded the sensor returns to DEFAULT.
ENTR =MENU(+) and ESC(-) are pushed simultaneously.
1.
At the start of the setting the sensor is in DEFAULT.
2.
Push MENU(+) once to reach the error code. The display shows E + the error code
number. No error is shown as E000.
3.
Push MENU(+) once. The display shows the CO set point e.g. 35.
4.
Push ENTR(+-) once. The display shows EC and two digits. Enter the access code to
the service menu. If the default code is used do like this: Push MENU(+) until the
digits stop. The display shows EC55. If the correct code is not entered before the time
limit exceeds the sensor returns to DEFAULT.
5.
Push ENTR(+-) once. The display shows SPCO to set the CO set point.
6.
Push MENU(+) once to reach the carbon dioxide set point. The display shows SP C.
7.
Push MENU(+) once to reach the setting of analogue outputs. The display shows
AOUt.
8.
Push ENTR(+-) to reach the output to be set. The display shows An and two digits e.g.
An 01. Step to the requested output by pushing MENU(+).
9.
Push ENTR(+-) to reach the setting of the MIN value. The display shows Set L.
10.
Push MENU(+) to reach the setting of the MAX value. The display shows Set H.
11.
Push ENTR(+-) to set the MAX value of the output. The display shows the numerical
value in % e.g. the standard setting100.0 % or previously set value. Push MENU(+) to
increase the MAX value. Push ESC(-) to decrease the MAX value. Push ENTR(+-).
The display shows Sure. Push ENTR(+-) to save the setting and return to Set H. Push
MENU(+) or ESC(-) to return to Set H without saving the new setting. Push ESC(-) to
return to the output to be set, item 12. Push ESC(-) once again to return to the setting
of analogue outputs item 11.
page 8 of 15
Figure 9. Maintenance functions available on aSENSE™ m III to set output limits. Only flow chart
for setting High limits are shown, but Low limits are set in the very same way. The numbers in the flow
chart refers to the points in example 1. Function blocks that are time limited are indicated by blue
boarders. Time limit refers to an internal time-out that returns the LCD and maintenance function back
to normal. ENTER is a simultaneous pressing on MENU and ESC.
EXAMPLE II:
Setting of set points for carbon monoxide concentration and carbon dioxide
concentration, the MAX and MIN values of the analogue outputs and
calibration of the sensor
The access code and the recalibration of the sensor are time limited. If the time limit is
exceeded the sensor returns to DEFAULT.
ENTR =MENU(+) and ESC(-) are pushed simultaneously.
1.
At the start of the setting the sensor is in DEFAULT.
2.
Push MENU(+) once to reach the error code. The display shows E + the error
code number. No error is shown as E000.
(Push ESC(-) to return to DEFAULT if requested
3.
Push MENU(+) once. The display shows the CO set point e.g.
35 ppm and the carbon dioxide set point e.g. 750ppm.
(Push ESC(-) to return to DEFAULT if requested.)
page 9 of 15
4.
Push ENTR(+-) once. The display shows EC and two digits. Enter the access
code to the service menu. If the default code is used do like this:
Push MENU(+) until the digits stop. The display shows EC55.
If the correct code is not entered before the time limit exceeds the sensor returns
to DEFAULT.
5.
Push ENTR(+-) once. The display shows SPCO to set the carbon monoxide set point.
6.
Push ENTR(+-) once. The display shows the carbon monoxide set point e.g. ex 35
ppm. Push MENU(+) to increase the set point value in steps of 1 ppm.
Push ESC(-) to decrease the set point value in steps of 1 ppm.
7.
Push ENTR(+-) once when the set point is set. The display shows SPCO.
Push ESC(-) to return to DEFAULT.
8.
Push MENU(+) once to reach the carbon dioxide set point.
The display shows SP C.
9.
Push ENTR(+-) once. The display shows the carbon dioxide set point e.g. 750 ppm.
Push MENU(+) to increase the set point value in steps of 50 ppm.
Push ESC(-) to decrease the set point value in steps of 50 ppm.
10.
Push ENTR(+-) once when the set point is set. The display shows SP C.
Push ESC(-) to return to DEFAULT.
11.
Push MENU(+) once to reach the setting of analogue outputs.
The display shows AOUt.
12.
Push ENTR(+-) to reach the output to be set. The display shows An and two digits e.g.
An 01. Step to the requested output by pushing MENU(+).
13.
Push ENTR(+-) to reach the setting of the MIN value. The display shows Set L.
14.
Push ENTR(+-) to set the MIN value of the output. The display shows the numerical
value in % e.g. the standard setting 0.0 % or previously set value. Push MENU(+) to
increase the MIN value. Push ESC(-) to decrease the MIN value. Push ENTR(+-). The
display shows Sure. Push ENTR(+-) to save the setting and return to Set L. Push
MENU(+) or ESC(-) to return to Set L without saving the new setting.
15.
Push MENU(+) to reach the setting of the MAX value. The display shows Set H.
16.
Push ENTR(+-) to set the MAX value of the output. The display shows the numerical
value in % e.g. the standard setting 100.0 % or previously set value. Push MENU(+)
to increase the MAX value. Push ESC(-) to decrease the MAX value. Push ENTR(+-).
The display shows Sure. Push ENTR(+-) to save the setting and return to Set H. Push
MENU(+) or ESC(-) to return to Set H without saving the new setting. Push ESC(-) to
return to the output to be set, item 12. Push ESC(-) once again to return to the setting
of analogue outputs item 11.
page 10 of 15
17.
Push MENU(+) to reach the calibration with fresh air. The sensor needs fresh air, air
with 400 ppm carbon dioxide. The display shows CALb. Push ENTR(+-). The display
shows Sure. Push ENTR(+-) to confirm that a background calibration should be done.
After completed background calibration the sensor returns to DEFAULT. If a
background calibration should not be executed push MENU(+) or ESC(-). The
background calibration has a time limit.
18.
Push MENU(+) to reach the zero point calibration. The sensor needs carbon dioxide
free air or gas. . The display shows CAL. Push ENTR(+-). The display shows Sure.
Push ENTR(+-) to confirm that a zero point calibration should be done. After
completed zero point calibration the sensor returns to DEFAULT. If a zero point
calibration should not be executed push MENU(+) or ESC(-). The zero point
calibration has a time limit.
FUNCTIONAL TEST of CO2 / CO aSENSE™ m III
Functional test
The unit has three LED’s – green, yellow and red. These LED’s indicate the status of the
controller. An internal delay function prevents the alarm functions of the relay and OUT4
output during two minutes after power up. The alarm outputs may be tested after the two
minutes delay
Green LED - ”No alarm situation” is lit, when the relay is contact closed.
Yellow LED - ”Call for maintenance” is lit, if an error flag is set or the measurement is out of
range. This information is also shown on the display by the wrench icon. Any push button
press, or executed maintenance function, is acknowledged by emission from this LED. If an
error has been detected both the yellow and red LEDs are lit.
Red LED - ”Alarm high gas concentrations” is lit, when the open collector output is activated
(contact closed). The CO concentration is 35 ppm or more OR the CO2 concentration is 1500
ppm or more OR if the yellow LED is lit.
A simple and visual functional test can easily be performed. Take a breath and blow the air
from a distance of a few centimetres on the sensor. The sensor will detect a rapid increase in
the carbon dioxide concentration. The red LED is lit and the green LED is turned off when the
CO or CO2 concentration goes above the pre-set value. If the sensor is connected to a
controller, the flow of the ventilation system will eventually increase by change of the fan
speed or opening of a damper actuator (depending on the installation/application).
Test gas verification
If the measurement of a sensor is to be verified, a test gas with carefully determined
concentration of CO and CO2 must be used. For zero calibration pure nitrogen or air that has
passed through a chemical absorber should be used. In fresh air the carbon monoxide
concentration is nearly zero. The Zero calibration bag can be used to produce carbon dioxide
free air. Check the CO and CO2 values of the display or the voltage of the output 1 for CO
and the voltage of the output 2 for CO2 with a multimeter when the values have stabilized.
page 11 of 15
When a zero calibration shall be executed a plastic tube with 2,2 mm outer diameter and 0,8
mm inner diameter shall be inserted in marked holes of the sensor. A plastic tubing is
connected to the tube. The gas flow should be between 0,3 and 1,0 l/min.
The yellow LED flashes when a calibration is executed .A calibration will only be executed if
the gas concentration is stable. If the yellow LED does not flash after 8 seconds no calibration
has been executed. Then try to do another calibration.
Marking
CALb CO2
CAL CO
Function
Background calibration = CO2 sensor calibration with fresh air. An easy way to
correct the zero point error. The sensor needs fresh air (380-420 ppm CO2). The CO2
sensor is calibrated to 400 ppm CO2.
Zero point calibration of the CO sensor with fresh air. The CO sensor is calibrated to
0 ppm CO
Gas inlet CO2
MENU
ESC
MENU
Gas inlet CO2
ESC
Figure 10. The PCB with the calibration jumper in default position. An enlarged part of the PCB with
marked gas inlets and jumper positions for calibration is shown at right.
PLEASE NOTE!
The sensor accuracy is defined at continuous operation (at least 3 weeks after installation)
Self diagnostics
The system contains complete self-diagnostic procedures. A full system test is executed
automatically every time the power is turned on. For aSENSE™ m III the internal voltage
regulators and outputs are checked. In addition, constantly during operation, checking the
valid dynamic measurement ranges checks the sensor probes against failure. These different
system checks return error bytes to the system RAM. If any error is detected, the yellow LED
will be lit until the error has vanished and the error flag is reset. “Warm up” and “Out of
Range” are the only bits that are reset automatically after return to normal state. All other
error bits have to be reset manually after return to normal state – either by pushing MENU &
ESC buttons simultaneously for (=Entr(+-) or by power off and restart.
page 12 of 15
By pushing the push button ”MENU” the error code number Exxx is shown on the LCD.
Descriptions of the different codes are listed below.
Error code and action plan
Bit #
Error
code
0
N/A
1
2
2
4
3
8
4
16
5
32
6
64
7
128
Error description
Fatal Error
Yellow LED continuously flashes.
Push buttons are not operating.
Reserved
Algorithm Error.
Indicate wrong EEPROM
configuration.
Output Error
Detected errors during output signals
calculation and generation.
Self Diagnostic Error.
May indicate the need of zero
calibration or sensor replacement.
Out Of Range Error
Accompanies most of other errors.
Can also indicate overload or failures
of sensors and inputs.
Resets automatically after source of
error disappearance.
Memory Error
Non fatal error during memory
operations.
Warm Up state
Is always set after power up or power
failure. Resets after restart sequence
Suggested action
Try to restart sensor by power OFF/ON.
Contact local distributor
Try to restart sensor by power OFF/ON.
Check detailed settings and configuration
with UIP software version 4.3 and higher.
Contact local distributor
Check connections and loads of outputs.
Check detailed status of outputs with UIP
software version 4.3 and higher.
Check detailed self diagnostic status with
UIP software version 4.3 and higher.
Contact local distributor
Try sensor in fresh air.
Check connections of temperature and
relative humidity probe.
Check detailed status of measurements
with UIP software version 4.3 and higher.
See Note 1!
Check detailed settings and configuration
with UIP software version 4.3 and higher.
If it doesn’t disappear in half a minute,
check power stability.
Table V. Error codes
Note 1. Any probe is out of range. Occurs, for instance, during over exposure of CO2 sensor, in which
case the error code will automatically reset when the measurement values return to normal. Could
also indicate the need of zero point calibration. A background calibration using push button function
”bCAL” will cure this error (a more exact zero calibration using ”CAL” may be performed later, if
required). If the CO2 readings are normal, and still the error code remains, the temperature or relative
humidity sensor can be defect or the connections to these are broken.
Please remark: If several errors are detected at the same time the different error code numbers
will be added together into one single error code!
Maintenance
The aSENSE™ m III is basically maintenance free. An internal self adjusting calibration
function takes care of normal long term drift associated to the CO and CO2 sensor. To secure
the highest accuracy, a time interval of five years is recommended between calibrations,
unless some special situations have occurred. A zero calibration can be performed by use of
the push button functions, or for a complete overview by use of a PC together with the UIP
software version 4.3 (or higher). This software can be free downloaded from
www.senseair.com. A RS232-cable is needed and can be ordered from SenseAir. The cable is
page 13 of 15
to be connected to the UART port slide connector (Fig 10). For change of control parameters
and re-calibration (CO2 and CO) this PC tool has to be used. The check can be done on site
without interfering with the ventilation system.
Figure 10. The aSENSE™
m III
printed circuit board with the connection terminal area is
enlarged. The terminal DI1 may be used for forced ventilation. If the sensor has a heater it is
connected to G+ and G0.
WARRANTY AND LIMITATION OF LIABILITY
1. SenseAir warrants that for a period of twentyfour (24) months following receipt by Buyer
the Product supplied by SenseAir to Buyer will be, under normal use and care, free from
defects in workmanship or material and to be in material conformity with SenseAir's
specifications. Units returned to SenseAir for warranty repairs shall be shipped to SenseAir, at
Buyer’s expense, according to SenseAir's instruction. Within ninety (90) days of the receipt of
product, SenseAir shall replace or repair such units and shall ship them to Buyer’s designated
return destination freight pre paid.
2. Warranty Limitations. This warranty does not extend to any unit that has been
subject to misuse, neglect or accident; that has been damaged by causes external to the
unit; that has been used in violation of SenseAir's instructions; that has been affixed to any
non-standard Accessory attachment; or that has been modified, disassembled, or reassembled
by anyone other than SenseAir.
3. The retailer is not responsible for any consequential loss or damages, which may occur by
reason of purchase and use of this product. The warranty is, in any event, strictly limited to
the replacement/repair of the product
This product is in accordance with the EMC 2004/108/EC, 92/31/EEG including amendments
by the CE-marking Directive 93/68/EEC
The product fulfils the following demands: EN 61000-4-2 level 2, EN 61000-4-3 level 2,
EN 61000-4-4 level 4, EN 61000-4-6, EN 61000-4-8 level 4, EN 55022 class B
page 14 of 15
Addendum
Push Button Operation for aSENSE® m III
This sensor has two push buttons, MENU (upper) and ESC (lower).
The YELLOW LED will acknowledge a successful push by a short flash. Wait until it goes out before
the next push.
ESC or a time out function will bring you back to start (5sec).
ENTR =MENU(+) and ESC(-) are pushed at the same time.
1. Push upper button MENU => E000
2. Push upper button MENU => 35ppm (or 1500ppm)
3. Push both buttons ENTR =>EC07
4. Step 5 steps with MENU =>EC55
5. Push both buttons ENTR => SpCO
6. Step 1 steps with MENU =>SpC (setpoint for CO2)
7. Push both buttons ENTR => the setpoint for CO2 appears
8. With MENU button you step up the setpoint value in steps of 50ppm
9. with ESC button you step down the value in 50ppm steps (If you push to long the step can
jump 100ppm)
15 of 15