Owner's manual
CALIBRATION CAL GROUP
Meter AdvDisplay System
Site
Log I/O
Cal
Factory
Transit
Doppler
Factory
Transit
Doppler
Figure 95: Advanced Group
Transit
Site Name0.00 GPM
1/16/2013
2:18 PM
CalMeter AdvDisplay System
Site
Log I/O
Transit
FactoryDoppler
User Adjustment
1.000
0.000
0.000
Positive
Flow
Reynolds
Correcting
SOS
Comp
Soundspeed Oset (us)
Delta Time Zero (ns)
Figure 96: Calibrate Transit Time
Press Delta Time Zero (ns) zeros to remove the No Flow transit time offset. This is also referred to as Zeroing the meter.
Because every flowmeter installation is slightly different and sound waves can travel in slightly different ways through these
various installations, it is important to remove the zero offset at zero flow to maintain the meter’s accuracy. A provision is
made using this button to establish Zero flow and eliminate the offset.
Procedure:
1. The pipe must be full of liquid.
2. Flow must be absolutely zero. Securely close any valves and allow time for any settling to occur.
3. Press the Transit Time Zero button (Delta Time Zero) once.
DXN Portable Ultrasonic Measurement System
Page 72 February 2013