08354B DCN7877
Teledyne API T640 PM Mass Monitor
62
PRESSURE SENSOR CHECK AND CALIBRATION
Figure 4-2. Pressure Cal Menu
IMPORTANT
IMPACT ON READINGS OR DATA
Perform this check/calibration prior to any flow calibration.
The T640 ambient pressure sensor is located within the instrument chassis. No
direct pneumatic connection to the instrument needs to be made to perform this
check/calibration. The units of measure can be displayed in either kPa or mmHg.
This setting exists in the VARS menu.
1. With the NIST-traceable pressure standard reference device operating and
measuring the ambient pressure in the same room as the T640, navigate to
the Pressure Cal menu (Calibration>Pressure Cal).
2. Compare the “Measured Pressure” in this screen to the Pressure Standard.
3. If the two values differ by ±10 mmHg, then press the value button in the “Actual
Pressure” field, enter the value measured by the Pressure Standard into the
keypad pop up, and then press the “Calibrate” button on this screen. Following
the prompt, confirm the instruments pressure sensor measurement matches
the NIST-traceable pressure standard reference device closely and the
procedure is complete.
