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the pressure transducer to the low side access port. Press the SH button. The
system superheat value is displayed along with the actual temperature and pressure
readings. Sub-cooling is measured in the same way, except the temperature probe
is attached to the liquid line, and the pressure transducer is attached to the high side
access port.
IMPORTANT: Superheat measurements use T1 and U1; Sub-Cooling
measurements use T2 and U2
Measure Relative Humidity and Dry-Bulb Temperature
Connect a Cooper relative humidity probe to either U1 or U2 (or both). The MFM300
will sense the probe and display the relative humidity and dry-bulb temperature
measurements with the appropriate U1 or U2 label.
Display Psychrometics
Connect a Cooper relative humidity probe to either U1 or U2 (or both). Press the
PSYCH button to display the psychrometrics calculated from the current relative
humidity and dry-bulb measurements. Press the PSYCH button again, or CANCEL
to return to Normal mode.
Measure Airflow
Connect a Cooper anemometer to either U1 or U2 (or both). The MFM300 will
display airflow in feet per minute (FPM) and temperature. To display airflow in cubic
feet per minute (CFM), press the ALT button. To insure that the correct cubic feet
per minute values are displayed, you must enter the shape and size of the duct
opening where airflow is being measured. To do this, press the MENU button while
viewing CFM. Use the on-screen directions to enter the duct shape and size and
press the ENTER button when done.
Air Balancing
To perform basic air balancing, the MFM300 will calculate the average CFM and
FPM using all entered readings. While viewing CFM, press the AVG button while
measuring airflow. Each time the AVG button is pressed, new average values are
calculated based upon the measurement being taken. The display will show the
average CFM and FPM and the number of individual readings taken. To clear all
average values, press the MENU button and then press the AVG button.
Navigate the Menu
Additional functions and settings are available through the MFM300 menu. Press the
MENU button to display the top-level menu and use the up/down arrow buttons to
select a menu option, then press the ENTER button.
Menu Functions
Adjust Contrast: Allows display contrast to be changed to suit lighting situation. Use
the up/down arrow buttons to set contrast and press the ENTER button to complete.
Press the CANCEL button to abandon changes.
View GL100 Log: Manage up to five datalogger downloads stored in MFM300
memory.
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