Max/Min Memory - Extech Instruments CO220 User Manual

VENT.R (CO ‐based demand‐controlled ventilation)
2
CO ‐based demand‐controlled ventilation refers to the practice of using carbon dioxide
2
concentrations as an indicator for a per‐person ventilation rate. In this context, CO
as a byproduct of respiration rather than as an indoor contaminant. The rate at which people
produce CO varies with diet and health, as well as with the duration and intensity of physical
2
activity. The more exertion an activity entails, the more carbon dioxide is produced.
CHANGING THE 2ND TIER DISPLAY COMBINATION
Repeated presses of the C/F‐RH% button step through the following combinations of
parameters:
 Humidity + Air Temperature
 Humidity + Web Bulb Temperature
 Humidity + Dew Point Temperature
MAX/MIN MEMORY
The meter automatically records Maximum and Minimum readings when the meter is switched
ON. In the normal mode, press the CO
While viewing the Max or Min reading, press and hold the SELECT/RECALL button to reset the
MAX or MIN memory. The "Clr" icon will appear for 2 seconds and the display will begin tracking
new MAX and MIN readings.
DATALOGGER MEMORY 99 READINGS
The user can store up to 99 CO
Press the ESC‐MEM button momentarily to save the current CO
reading with date/time stamp. The meter will emit a short beep and
the memory location number will replace the RH reading for 2
seconds before returning to the RH reading.
Once the memory is full, the meter will overwrite the first data point
stored and continue to overwrite existing readings as new readings
are stored.
To recall the data use the SELECT/RECALL button. The middle tier display will show the
memory location number and the top tier display will show the stored reading in ppm. The
bottom tier display shows the date/time stamp for the displayed reading.
o o
Press the C/ F‐RH% button momentarily to return to the normal operating mode.
Press and hold the SELECT/RECALL button to reset the 99 point memory bank, the "Clr" icon will
appear for 2 seconds before returning to the normal display mode.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
button to see the maximum and minimum levels of CO
2
readings in memory for later recall.
2
TestEquipmentDepot.com
6
is monitored
2
2
CO220-EU-EN V1.3 07/13
.
2