Wohler CM 220 User manual
Wöhler CM 220
1. Important information
Befor e using this instrument, car efully r ead and observe all notes
contained in these operating instructions.
Fundamentally , skilled personnel only should use the Wöhler
CM 220 for the purpose that it is intended and within the speci-
fied data range. No liability is accepted under any circumstances
or guarantee given for r esults determined in conjunction with this
instrument nor for any damage that may arise when using this
instrument.
Recovering time is r equired when the meter was exposed to high
level CO. The longer the exposur e, the longer r ecovering time is
needed.
2. Specification
2.1 Application
The Wöhler CM 220 is a digital pen type CO meter that can be used for do -
mestic purposes to check fur naces, r oom heaters, central heating fur naces,
water heaters etc. as well as for commer cial purposes, e.g. the ventilation
contr ol of indoor parking garages.
The electr ochemical sensor garantizes an exact measur ement even if other
gases interfer e.
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Wöhler Technik GmbH
1. Important information
Wöhler CM 220
ENGLISH
2.2 Technical Data
Measuring range: 0 - 999 ppm
Accuracy: +/- 20% at 0 - 100 ppm
+/- 15% at 100 - 500 ppm
(at 20+/-5°C, 50+/-20% RH)
Resolution: 1 ppm
Power supply: 3 pieces AAA
Response time: within 60 seconds
Operating humidity: 5 - 99% RH (no condensation)
Storage condition: -20 - 60°C
Operation temperatur e: 0 - 45°C
Meter size: 175 x 47 x 28 mm
Scope of delivery: Wöhler CM 220, carrying pouch, manual,
3 AAA batteries
2. Specification
Wöhler CM 220
3. Operating Elements
3.1 Display
Figur e 3.1: Display
1. Primary display: Curr ent CO value
2. Secondary display: Max. CO value
3. Battery indicator: low battery
3.2 Function keys
1. Turn on and of f the backlight.
Switch temperatur e unit C and F .
Reset the maximum CO value
2. Turn the meter on and of f. Select the alarm value
1 + 2 : Enter calibration mode
3. Operating elements
Figur e.3.2: Function keys
1
2
25 ppm
Max 34
2
1
3
Wöhler CM 220
ENGLISH
4. Operation Instructions
4.1 Power on/off
Press the power -key to tur n on and tur n of f the meter (see fig 3.2, key 2).
When the meter is power ed on, the pr eset alarm value and curr ent air tempe-
rature will be blinking on the LCD. The meter is now running a self-test and
will finish in about 15 seconds with a short beep. It will then enter the measu-
ring mode.
Figur e. 4.1: Display during the self-test
Important: It is recommended to turn on the meter in an area free of CO
since high CO level may cause failure in passing Self-Test.
4.2 Switch temperature units
Users can select °C or °F as the temperatur e unit by pr essing the backlight
key (see fig. 3.2, key 1) for more than 1 second during the self-test.
4.3 Alarm setting
The alarm value of the meter is pr eset at 25 ppm to give war nings of possible
danger . Users can adjust the value for dif ferent needs or standar d by tur ning
off the meter , then pr ess and hold the power -key (see fig. 3.2, key 1) until
the value options appear in the display . Ther e ar e 10, 25, 30, 35, 45, 50, 70
and 100 ppm displaying in cycles. Release the button to select the pr eferred
value. Then the meter will r eturn to Self-T est mode in some seconds.
4. Operating instructions
A 25 ppm
20 C
Wöhler CM 220
4.4 Measurement
The meter measur es the CO concentration at the sensor and displays the
reading in ppm. It also indicates the maximum value (at the lower side of the
display) of all r eadings since it is power ed on. Users can r eset the maximum
value by pr essing the backlight-key for two seconds in the measuring mode.
4.5 Backlight
The meter featur es backlight function for using in dark ar eas. Pr ess the back-
light to activate and switch of f the backlight. (Figur e 3.2, key 1).
4.6 Low battery indicator
The low battery indicator appears in the display when the battery voltage gets
low. The measur ed values may be mor e inexact now . In this case you have to
change the batteries.
4.7 Auto power off
The meter tur ns itself of f automatically after 15 minutes non-operation. (It will
not auto power of f during the calibration).
5. 0-ppm-Calibration
Calibrate the meter in an ar ea free of CO. T o enter the calibration mode, tur n
off the meter and pr ess the power -key and the backlight-key simultaneous-
ly for two seconds. „ppm“ will blink in the upper display and the calibration
value „0“ at the lower side. Now the meter is running the 0 ppm calibration as
a default.
Now the meter calibrates automatically . The LCD is displaying a blinking
ppm value and it stops blinking when the calibration is completed. This takes
about 10 minutes.
Note: Do not be alarmed if high ppm or minus value shows up when entering
the calibration mode. It will go down and appr oach to 0 in seconds.
4. Operating instructions
Wöhler CM 220
ENGLISH
6. Troubleshooting
Problem Solution
The meter is switched on but
there is no display .
a) Make sur e that the batteries ar e in
good contact and corr ect polarity .
b) Replace a new battery and try again.
The display disappears. If the low battery indicator was shown
before the display disappear ed, r eplace
a new battery .
Calibration failur e If the low battery indicator was shown
before the calibration, r eplace a new
battery.
E 2 The value is underflow.
E 3 The value is overflow.
E 31 und E 33 Retur n the meter to the dealer for r epai-
ring.
E 35 a) Self-T est failur e: Turn on the meter
again in other ar ea free of CO.
b) Sensor failur e: Retur n the meter to
the dealer for r epairing.
6. Troubleshooting
Wöhler CM 220
7. CO levels and its effect
ppm Symtoms and applicable standard
0-1 Normal backgr ound levels
9 Maximum indoor air quality level
200 Mild headache, fatigue, nausea and dizziness within 2-3 hours
400 Frontal headache, life thr eatening after 3 hours
800 Dizziness, nausea, convulsions, life thr eatening after 2-3 hours
1600 Nausea within 20 minutes, death within 2-3 hours
8. Information on disposal
You may hand in any defective batteries taken out
of the unit to our company as well as to r ecycling
places of public disposal systems or to selling points
of new batteries or storage batteries.
In the Eur opean Union, electr onic equipment does
not belong into domestic waste but - in accor dance
with Dir ective 2002/96/EC of the Eur opean Par -
liament and of the Council of 27 January 2003 on
Waste Electrical and Electr onic Equipment - must be
disposed of in an expert manner . If you do no longer
need this unit, please dispose of it in accor dance
with the applicable statutory pr ovisions.
7. CO levels and its ef fect
Wöhler CM 220
ENGLISH
9. Declaration of confirmity
The pr oduct: Wöhler CM 220 conforms with the essential pr otection r equi-
rements which ar e set out in the dir ectives of the Eur opean Council for to
adapt the legal pr ovisions of the Member States in r espect of electr omagnetic
compatibility (2014/30/EU).
The following standar ds wer e availed of to evaluate the pr oduct in r espect of
electr omagnetic compatibility:
EN 61326 : 1997 + A1 : 1998 + A2 : 2001 + A3 : 2003
EN 61000-4-2
EN 61000-4-3
9. Declaration of confirmity
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