TSI Instruments AIRFLOW Instruments ProHood PH721 - Set Deadband on and off; Calibrate the Micromanometer (User Calibration)

Chapter 4: How To 27
Set Deadband On and Off
The deadband determines the velocity or volume measurement threshold for displaying 0. If the deadband
is ON, readings below 18 fpm (0.0914 m/s) or 18 cfm (30.58 m
3
/h, 8.49 l/s) will be displayed as 0. If the
deadband is OFF, readings down to 0 will be displayed. The default is set to ON.
1. Press
to display CHANGE Test ID.
2. Press  until SETUP appears.
3. Press
.
4. Press  until DEADbAnd appears.
5. Press
. The display shows whether DEADbAnd is on or off.
6. Press  or  to change the option. Options are: ON and OFF.
7. Press
. DEADbAnd is displayed.
8. Press ESC to return to the main display.
Calibrate the Micromanometer (User Calibration)
A full instrument checkout and calibration with a calibration certificate is available from the factory.
However, some users prefer to calibrate their own instruments. Pressure, temperature and humidity can be
calibrated in the field.
1. Press
to display CHANGE Test ID.
2. Press  until CALIB appears.
3. Press
. The display shows CALIB plus which measurement is selected for calibration.
4. Press  until the desired measurement to calibrate is shown.
5. Press
. The display shows SPAN and the requested calibration condition is shown on the bottom
left. If the current measurement is available for display, it will be shown on the bottom right.
6. Try to expose the sensor being calibrated to a condition close to the requested calibration condition
on the lower left. Press  or  to change the value shown on the lower left to the actual value you
want the display to read under that condition.
7. Press
. The display will show the next desired span condition. Repeat steps 6–7 until the display
shows DONE. If any errors are shown on the display it is because the user calibration data taken is
too much different from the factory calibration data. Error codes are explained at the end of
Chapter 7
.
Note: The calibration for the accessory temperature/humidity probe is saved on an EEPROM in the
probe. If that probe is unplugged and used in a different micromanometer, the calibration
will follow the probe. The calibration for the temperature probe and the hood base
temperature sensor is saved in the micromanometer. If those probes are unplugged and used
in a different manometer, the calibration will not follow the probe.
The hood flow calibration is an offset from the factory calibration. An offset of ±12% can be
applied to the hood flow measurement. With the hood icon on the display illuminated and the
display showing FACTOR, use the UP or DOWN key to adjust the offset facto, and press