FUNCTIONAL
TRANSCEIVER
The MultiRanger Plus transceiver will transmit via the transducer, a set of long and/or
short pulses per measurement. The number and duration of the pulses is dependent
upon P-88.
A short pulse has a maximum measurement range of 2 m (6.6 ft) from the transducer
face.
A long pulse has a measurement range of 2 m (6.6 ft) from the transducer face out to
its maximum setting (P-3, empty distance to transducer plus P-87, range extension).
DAMPING AND PROCESS RATE
The MultiRanger Plus provides damping to control the maximum rate of change of the
displayed material level, volume or flow rate and of the mA output signal. As most
relay functions respond to the dampened level reading, they indirectly fall under the
control of the damping function. Damping may be set within the range of 0.001 to
9999 in units selected per minute (eg. if P-1 = 3 and P-68 = 15, then the fill damping
rate is 15 ft/min). P-68 is set to provide damping specifically for filling conditions while
P-69 is set to provide damping specifically for emptying conditions.
The required damping may be estimated by filling and emptying the vessel at its
normal rate. The rate of material level change can be viewed via the process rate
display parameter, P-70 or by pressing "7" while in the run mode. The value of P-68
and P-69 should be equal to or greater than the rates of level change encountered in
P-70. The process rate averaging parameter P-71 selects the method of averaging
used to determine the process rate display, however it has no bearing on the
damping function.
Damping is often used to slow down the rate of response of the display especially
where liquid surfaces are in agitation or material falls into the sound path during filling.
When in the program mode, the damping is automatically overridden to give fast
response when "MEAS" is pressed. In the run mode, the response can be further
increased by turning the fuzz filter (P-72) and agitator discriminator (P-73) off
- ONLY if they are not required.
If the transducer aiming is being adjusted while in the run mode, it is suggested that
damping be at its factory setting of 10 to start. The damping can later be changed to
suit prevailing conditions.
Upon a loss of echo condition and after the fail-safe timer (P-75) expires, the display
will go to fail-safe high at the fill damping rate if P-74 = 1 or to fail-safe low at the
empty damping rate if P-74 = 2.
PL-443 5 – 1
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