W HLER CM220 CO Detector Instruction Manual
- June 16, 2024
- W HLER
Table of Contents
W HLER CM220 CO Detector
General Information
Operation Manual Information
This operation manual allows you to safely work
with the Wohler CM 220. Please keep this manual for your information.
The Wohler CM 220 should be used by trained professionals for its intended use
only.
Liability is void for any damages caused by not following this manual.
Notes
WARINING!
Not following this warning can cause injury or death.
ATTENTION!
Not following this note can cause permanent damage to the analyzer.
NOTE!
Useful information
Intended Use
The Wohler 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 giantizes an exact measurement even if other gases
interfere..
Scope of Supply
| Meter | Components |
|---|---|
| Wohler CM 220 | CO-Meter |
3 x AAA batteries
Carrying pouch
Information on disposal
Electronic equipment does not belong into domestic waste, but must be disposed
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.
Address
Wohler Technik GmbH
Wohler-Platz
33181 Bad Wunnen berg
Tel.: + 49 2953 73-100
Fax: + 49 2953 73-250
E-Mail: info@woehler.de
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 60 s
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 2- 3 hours |
| 400 ppm | Frontal headache, life threatening after 3 hours |
| 800 ppm | Dizziness, nausea, convulsions, life threatening after 2- 3 hours |
| 1600 ppm | Nausea within 20 minutes, death within 2-3 hours |
Design and Function
Display
- Aktueller CO-Wert
- maximizer CO Wert
- Batterie symbol: Batterie bald wechseln
Keys
-
Turning the backlight on and off
Switch between temperature units C and F
Reset the max. CO value -
Switching the gate on and off. Setting alarm value 1 + 2: Turn on calibration mode
-
Operation
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
level may cause failure in passing Self-Test.
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.
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 standard by turning off the meter, then press and hold 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 preferred value. Then the meter will return to Self-Test mode in some seconds.
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.
Backlight
The meter features backlight function for using in dark areas. Press the backlight to activate and switch off the backlight.
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.
Auto power off
The meter turns itself off automatically after 15 minutes non-operation. (It will not auto power off during the calibration).
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“ 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 approach to 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 other area free of CO.
b) Sensor failure: Return the meter to Wohler for repairing.
Warranty and Service
Warranty
Each Wohler 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 Wohler CM 220 will be 12 month
from the date of sale.
Not covered by the warranty are the batteries and the costs for transport and
package.
Service by non authorized personnel or making modifications to the meter voids
any warranty.
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: Wohler 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 Wunnenberg, 21.09.2022
Johannes Lottering, Geschäftsführer/Managing
Director