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O
P
HOTOMETER
3
The photometer sample gas flow rate is measured directly by a flow sensor located on the
pressure / flow sensor PCA. A slope factor, stored in the calibrator's memory the last time
a Photo Flow calibration was performed, is applied to the reading from that sensor.
The measured photometer sample gas flow value is viewable in the Dashboard as Photo
Flow (configure via Setup>Dashboard) and can be output to the Data Logger (see Section
3.3.1 for configuration).
Note
To calibrate the flow of gas through the portable calibrator's optional photometer bench:
1. Connect the external flow meter's output connection directly to the EXHAUST
2. Power on the calibrator and navigate to the Utilities>Diagnostics>Photo
3. Press the Enable button and allow a few minutes for the external flow meter to
4. Press the Actual Flow button and input the reading from the external flow
5. Press the Calibrate button, which updates the measured flow within a few
083730750B DCN8606
(O
T750) G
PTION IN
The procedure described in this section requires a calibrated
external flow meter.
port of the portable calibrator.
Flow Cal page.
Figure 6-8. Photometer Flow Calibration Page
stabilize.
meter.
seconds.
F
C
AS
LOW
ALIBRATION
111
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