Pressure Sensor Calibration; Flow Calibration; Figure 4 Pressure Calibration Screen - Teledyne T640 Standard Operating Procedure

10.2.1 Pressure Sensor Calibration

The pressure measurement of the T640 is for the ambient pressure in which the instrument is
operated. No direct pneumatic connection to the instrument needs to be made to perform this
calibration and data are not affected.
1. With the Pressure Standard operating and measuring the ambient pressure in the same room
as the T640 monitor, navigate to the Pressure Cal menu: >Calibration >Pressure Cal.
2. Compare the "Measured Pressure" in this screen to the Pressure Standard (Figure 4).
3. Press the value button next to the "Actual Pressure" field, enter the value measured by the
Pressure Standard, and press the "Calibrate" button on this screen. The Status should
change to "Success".
4. Record to the Calibration Log.
The Measured Pressure value should change to closely match the Actual Pressure within a few
seconds

10.2.2 Flow Calibration

Flow calibrations for sample flow (5.0 lpm) can be conducted with the instrument operating
normally so long as the channels are "in Maintenance". Flow calibrations are conducted on the
sample flow by going to the sample flow calibration menu at: >Calibration >Sample Flow Cal.
1. Set up your NIST-traceable flow standard transfer device with the appropriate inlet for the
flow to be calibrated. Ensure audit device is appropriately sized for 5.0 lpm flow.
2. Remove the inlet from Upper Inlet Tube.
3. Connect the Flow Standard to the top of the Upper Inlet Tube. Ensure the tubing connecting
the inlet to the Flow Standard is not kinked.
4. With the T640 running, go to the Calibration > Sample Flow Cal menu (Figure 5).

Figure 4 Pressure Calibration Screen

11
DEP 03-21
Revision No. 0
November 2017