WOHLER CM 220 CO Detector User Manual
- June 4, 2024
- WOHLER
Table of Contents
CM 220 CO Detector
**User Manual
Operating manual CO Detector
Wöhler CM 220 **
General Information
1.1 Operation Manual Information
This operation manual allows you to safely work with the Wöhler CM 220. Please
keep this manual or your information.
The Wöhler CM 220 should be used by trained professionals for its intended use
only. Liability is void for any damages caused by not ollowing this manual.
1.2 Notes
WARNING!
Not following this warning can cause injury or death.
ATTENTION!
Not following this note can cause permanent damage to the analyzer.
NOTE!
Useful information
1.3 Intended Use
The Wöhler CM 220 is a digital pen-type CO meter that can be used for domestic
purposes to check furnaces, room heaters, central heating furnaces, water
heaters, etc. as well as for commercial purposes, e.g. the ventilation control
of indoor parking garages. The electrochemical sensor guarantees an exact
measurement even if other gases interfere..
1.4 Scope of Supply
| Meter | Components |
|---|---|
| Wöhler CM 220 | CO-Meter |
3 x AAA batteries
Carrying pouch
1.5 Information on disposal
Electronic equipment does not belong to domestic waste but must be disposed of
in accordance with the applicable statutory provisions.
You may hand in any defective batteries taken out of the unit to our company
as well as to recycling places of public disposal systems or to selling points
of new batteries or storage batteries.
1.6 Adress
Wöhler Technik GmbH
Wöhler-Platz
33181 Bad Wünnenberg
Tel.: + 49 2953 73-100
Fax: + 49 2953 73-250
E-Mail: [email protected]
Technical Data
| Description | Value |
|---|---|
| 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 AAA batteries
Response time| within the 60s
Operating humidity| 5 – 99% RH (not condensing)
Storage condition| – 20 – + 60°C
Operation temperature| 0 – 45°C
Meter Size| 175 x 47 x 28 mm
CO Levels and its effects
| CO-Concentration | Symptoms |
|---|---|
| 0-1 ppm | Normal background levels |
| 9 ppm | Maximum indoor air quality level |
| 200 ppm | Mild headache, fatigue, nausea, and dizziness within 23 hours |
| 400 ppm | Frontal headache, life threatening after 3 hours |
| 800 ppm | Dizziness, nausea, convulsions, life threatening after 23 hours |
| 1600 ppm | Nausea within 20 minutes, death within 2-3 hours |
Design and Function
4.1 Display
- Aktueller CO-Wert
- maximaler CO Wert
- Batteriesymbol: Batterie bald wechseln
4.2 Keys
1 Ein- und Ausschalten der Hintergrundbeleuchtung
Wechsel zwischen den Temperatureinheiten C und F
Reset des max. CO Wertes
2 Ein- und Ausschalten des Gerätes. Einstellen des Alarmwertes
1 + 2 : Einschalten des Kalibriermodus
Operation
5.1 Power on/off
Press the power key to turn on and turn off the meter. When the meter is
powered on, the preset alarm value and current air temperature 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 measuring mode.
WARNING!
It is recommended to turn on the meter in an area free of CO since high CO
levels may cause failure in passing Self-Test.
5.2 Switch temperature units
Users can select °C or °F as the temperature unit by pressing the backlight
key for more than 1 second during the self-test.
5.3 Alarm setting
The alarm value of the meter is preset at 25 ppm to give warnings of possible
danger. Users can adjust the value for different needs or standards by turning
off the meter, then pressing and holding the power key until the value options
appear in the display. There are 10, 25, 30, 35, 45, 50, 70, and 100 ppm
displaying in cycles. Release the button to select the pre- ferred value. Then
the meter will return to Self-Test mode in seconds.
5.4 Measurement
The meter measures 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 readings since it is powered on. Users can reset the maximum value by
pressing the backlight key for two seconds in the measuring mode.
5.5 Backlight
The meter features a backlight function for use in dark areas. Press the
backlight to activate and switch off the backlight.
5.6 Low battery indicator
The low battery indicator appears in the display when the battery voltage gets
low. The measured values may be more inexact now. In this case, you have to
change the batteries.
5.7 Auto power off
The meter turns itself off automatically after 15 minutes of non-operation.
(It will not auto power off during the calibration).
5.8 0 ppm calibration
Calibrate the meter in an area free of CO. To enter the calibration mode, turn
off the meter and press the power key and the backlight key simultaneously for
two seconds. „ppm“ will blink in the upper display, and the calibration value
„0“on 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 a high ppm or minus value shows up when entering the
calibration mode. It will go down and approach 0 in seconds.
Troubleshooting
| Problem | Solution |
|---|---|
| The meter is switched on but there is no display. | Make sure that the |
batteries are in good contact and
correct polarity.
Replace a new battery and try again.
Calibration failure| If the low battery indicator was shown before the
calibration, replace a new battery.
E 2| The value is underflow.
E 3| The value is overflow.
E 31 und E 33| Return the meter to the dealer for repairing.
E 35| a) Self-Test failure: Turn on the meter again in another area free of
CO.
b) Sensor failure: Return the meter to Wöhler for repair.
Warranty and Service
7.1 Warranty
Each Wöhler CM 220 will be tested in all functions and will leave our factory
only after extensive quality control testing.
If used properly, the warranty period for the Wöhler CM 220 will be 12 months
from the date of sale. Not covered by the warranty are the batteries and the
costs for transport and package.
Service by nonauthorized personnel or making modifications to the meter void
any warranty.
7.2 Service
We see SERVICE as a very important element in our business. That is why we are
still available to you even after the guarantee period has expired.
- An immediate repair will be carried out if you bring your meter to one of our approved service centers listed below.
- You can obtain immediate help from our engineers by telephone.
Declaration of conformity
The product:
Name: CO-Meter
Model: Wöhler CM 220
has been tested in accordance to essential protection requirements of
Council Directive 2014/30/EU and found the test results indeed meet the
limitation of the relevant test
standards listed below:
EN 61326-1 (2013)
(CISPR11, IEC/EN 61000-4-2 (2009)/-3 (2006+A2 :2010)/-8(2010)
Bad Wünnenberg, 21.09.2022
Johannes Lötfering, Geschäftsführer/Managing Director