measurement’s reliability and accuracy. If it is found that false echoes are appearing
ahead of the blanking zone, P-87 should be reduced accordingly.
Blanking is automatically corrected for sound velocity change where temperature
and velocity compensation is used, keeping the blanking at the distance at which it
was entered.
AGITATOR DISCRIMINATION
In applications where there is an agitator operating in the vessel, the blades may
interfere with level readings when the material level is lower than the blades. In such a
case, the agitator discriminator (P-73) can be turned on (factory setting).
With the agitator turned on, the reading will not change unless the echo is closer for at
least 5 consecutive measurements nor will it change unless the echo is farther for at
least 2 consecutive measurements.
This feature allows the MultiRanger Plus to remain locked on the true echo, even if
there are occasional false echoes due to the agitator blades, electrical noise or
crosstalk from other ultrasonic units.
Agitator discrimination, however, slows down the MultiRanger Plus’s speed of
response. Therefore, if fast response is required, especially when aiming the
transducer while in the run mode, and there is no agitator involved, the discriminator
should be turned off.
Agitator discrimination will not work if the blades are
stationary and in the transducer’s beam path.
RELAYS
General
Five onboard multi-purpose relays are provided on the MultiRanger Plus. Each relay
may be independently assigned to one function and has a corresponding status LED,
visible through the front cover.
The relay functions fall under three modes of operation :
» alarm : alarm ON = LED ON = relay coil de-energized
» pump : pump ON = LED ON = relay coil energized
» miscellaneous : contact closed = LED ON = relay coil energized
Complete programming of each relay requires two steps. Refer to the Relay
Programming Chart Relays.
1 - select a relay function
2 - enter relay ON/OFF setpoints for function options 1-6 and 8-10.
OR
- set control parameters for function options 7,11,12,13 and 14.
PL-443 5 – 4
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