Chapter 8. Servicing the PT878
Transport® Model PT878 Portable Liquid Flowmeter User’s Manual 167
Dual-Point Calibration (cont.)
IMPORTANT: Be sure to hold the transducer steady until the GE wait
cursor disappears.
10. Use the [S] key to return to the Zero tab, and then scroll to the Display
tab (page 162) to confirm the block length within ±0.002. If the
measurement is not within this limit, recalibrate the transducer offsets.
Once you have completed calibration, the transducer should remain
calibrated until the meter memory is cleared or a dramatic shift in ambient
conditions occurs.
To leave the Zero window:
• Press the [W] or [X] arrow key to move to another tab to take
readings or perform a velocity calibration.
• Press [F2] (Cancel) to return to Operate Mode without confirming the
soundspeed value.
• Press [F3] (OK) to confirm the new value. The PT878 returns to
Operate Mode.
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