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Getting Started Teledyne API T703/T703U Calibrator Operation Manual
44
3.4.7. SETTING THE OUTPUT FLOW RATE
The output flow rate must consider both the total gas flow requirements of all analyzers
connected to the output manifold and the minimum output flow of the O
3
generator.
Figure 3-14 shows a close-up of the regulator assembly.
3.4.7.1. Calculating Output Flow Rate
First, add the sum of the flow requirements of all of the instruments to which the
T703/T703U will be supplying calibration gas plus 1 LPM excess flow. For example, if
the T703 is expected to supply calibration gas mixtures simultaneously to two analyzers,
each requiring 0.8 LPM , the minimum Total Flow output would be:
(0.8 + 0.8) + 1.0= 2.6 LPM
Second, calculate the flow rate requirements of the O
3
generator output, which must
remain above the minimum specification of 20 PPB*LPM. Use the following equation
to determine the minimum flow rate (FT) for the O
3
generator output:
ConcO
LPMppb
F
T
3
20
Compare the values calculated from the of the above formulae; the greater of the two is
the minimum Total Flow that must be set.
3.4.7.2. Flow Setup for GPT
To set the output flow:
1. Open the front panel of the calibrator by releasing the two snap-in fasteners at the
top of the front panel.
2. Pull out the regulator knob and adjust the regulator until the desired flow is
achieved.
The front panel of the calibrator displays the approximate output flow based on
the measured regulator pressure, but this flow should be verified with an
independent calibrated flow meter attached to one of the CAL GAS outlets on
the back of the instrument (see Figure 3-4).
3.
Push the reg
ulator knob back in to lock.
4. Close the front panel.
Figure 3-14: Pressure Regulator Adjustment Knob
07223C DCN6572