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M703E Calibration and Verification M703E Calibrator Operator’s Manual
8.4. M703E GAS FLOW CALIBRATION
The M703E has two gas flow characteristics that affect its performance: the flow of gas thought the sample
chamber of the instrument’s photometer and the total gas flow being output. While both are stored in the
calibrator’s memory and used to compensate the final concentration calculations for changes in atmospheric
pressure, they are calculated quite differently.
PHOTOMETER SAMPLE GAS FLOW RATE:
This flow rate is measured directly by a flow sensor located pressure / flow sensor PCA. A slope factor, stored
in the calibrator’s memory the last time a
PHOTO FLOW calibration operation (see Section 8.4.1) was
performed, is and applied to the reading from that sensor.
The calculated photometer sample gas flow value is viewable on the instrument’s front panel using the
PHOTO
FLOW
test function and can be output via the M703E’s TEST CHANNEL output using the SAMPLE FLOW
function.
OUTPUT GAS FLOW RATE:
This flow rate is calculated by applying a separate slope factor, also stored in the calibrator’s memory, to an
interpolated valued based on the following table of internal gas pressure as measured by the O
3
gas input
pressure sensor. The output-flow slope value is determined by performing an
OUPUT FLOW calibration
operation (see Section 8.4.2).
Table 8-2: M703E Gas Pressure to Output Flow conversion Table
M703E REGULATOR PRESSURE TO OUTPUT FLOW
PSIG LPM
0 0.000
1 0.676
2 1.214
3 1.659
4 2.071
5 2.463
6 2.816
7 3.178
8 3.536
9 3.851
10 4.166
15 5.744
20 7.282
25 8.755
30 10.254
35 11.695
40 13.146
The calculated
OUTPUT FLOW value is viewable on the instrument’s front panel using the OUTPUT FLOW test
function and can be output via the M703E’s
TEST CHANNEL using the OUTPUT FLOW function.
128 05744 Rev B