7ML19981CJ01 MiniRanger Plus Page 33
Functional
Functional
Transceiver
The MiniRanger Plus transceiver operates under 1 of 5 sets of preset
conditions (P003), summarized as follows:
parameter
value
measurement
response
echo
verification filter
f-s timer*
(P070)
long
pulses*
1 0.1 m/min (slow) on on 100 2
2 1 m/min
on on 10 2
3 10 m/min
on on 1 2
4 102 m/min / 1.7 m/sec
off on 0.1 1**
5 1020 m/min / 17 m/sec (fast) off off 0 1**
*each measurement consists of one short pulse plus the set number of long pulses.
**set number of long pulses, only if required.
When a measurement is initiated, the set number of short and long pulses is
transmitted. Short pulse measurements are restricted to the first 2 m range
extending from the transducer face. When a short pulse is combined with a
long pulse set, the short pulse range is restricted to 1 m and the long pulse
covers the full measurement range.
When the echo of the transmitted pulse train is received, the relevant echo
extraction technique (P820), is applied to determine the true material echo.
The measurement response limits the maximum rate at which the display,
mA output and relay contacts respond to changes in measurement. It is of
concern especially where liquid surfaces are in agitation or material falls into
the sound path during filling.
Transducer
The transducer, which is connected to the transceiver and mounted remotely
at the measurement site, converts the electrical energy of the transmit pulse
into acoustical energy and converts the acoustical energy of the echo back
into electrical energy for the transceiver receive period.
Some transducer models incorporate an integral temperature sensor. The
echo and temperature signals share the same cable wiring, then segregated
at the transceiver.
Temperature
In order to compensate for uniform temperature changes of the sound
medium, temperature sensing is achieved using a transducer with an
integral sensor.
If the transducer does not have an integral sensor, temperature
compensation is fixed at a programmed value, P661. The difference
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