Instruction manual

Fyrite

INSIGHT

Plus Manual Calibration and Maintenance
0024-9487 Rev 2 87
Step Pressure Sensor Calibration Procedure
1 Assemble the pressure sensor calibration equipment as shown above, but DO
NOT connect the analyzer to the calibration equipment at this time.
2 If not already done, power ON the analyzer and display the CALIBRATION
menu. Note that this requires password validation (see page 55).
3 Use the UP () and DOWN () arrow buttons to select PRESSURE and then
press ENTER to display the CALIBRATE PRESSURE screen.
"Measured" is the pressure value currently being detected by the pressure
sensor, while "Applied” is a known value of pressure that will be applied for
calibration purposes.
4 With both the -ΔP and +ΔP ports open to the atmosphere, observe that the
current measured pressure reading should be 0.00 ± 0.01 inwc. If necessary,
zero the pressure sensor (Menu → Pressure → Zero) then repeat steps 2
through 4).
5 Connect the hose from the manometer to the +ΔP port and apply a negative
pressure to this port by adjusting the bellows for a manometer reading of
-4.00 (negative 4.00). Other units are shown below.
Units Name
Nominal Calibration
Point
inwc inches water column -4.00 inwc
mB millibars -10.00 mB
hPa hecto Pascals -10.00 hPa
Pa Pascals -1000 Pa
mm H
2
O millimeters of water -101.6 mm H
2
O
6 Use the UP (), DOWN (), LEFT (), and RIGHT () arrow buttons to enter
an “Applied” value that exactly equals the manometer reading.
NOTE: The calibration range is from -6 to -2 inwc (-15 to -5 mB).
An attempt to calibrate outside this range will cause the
message "Applied Value High" (or Low) to appear at the bottom
of the screen.