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MiniRanger Plus – INSTRUCTION MANUAL
7ML19981CJ02
Functional
Transceiver
The MiniRanger Plus transceiver operates under 1 of 5 sets of preset conditions (P003),
summarized as follows:
*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, which is 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 between the fixed value and the actual
temperature surrounding the transducer will cause an error in measurement.
parameter
value
measurement
response
echo
verification
filter
s times
(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**
