Specifications

HYDROLOGICAL SERVICES
DL3 100-029 IMP
Issue 2: 15/11/2005
The analog 4-20mA pressure transducer that measures river depth connects to the RRDL-3 logger
through a smart sensor interface. Zero depth is represented by 4mA and maximum depth is
represented by 20mA. The "Transducer Reference" (TXR) parameter defines the 20mA depth
expressed in metres of water.
On-line Help
TXR?
Transducer Reference: Defines the 4-20mA transducer max depth
(What 20mA represents in terms of metres of water)
Syntax: TxR<CR> Displays transducer ref
TxR=030.0<CR> Sets transducer range to 030.0
when transducer at max
The"TransducerInterval" (TXI) parameter definesthefrequencythat analogmeasurementsare made
as well as the time that the transducer is powered before a measurement is made.
On-line Help
TXI?
Transducer Interval: Defines the pressure transducer interval between
measurements (mins) and power up settling time (secs)
Syntax: TxI<CR> Displays the transducer intervals
TxI=10/5<CR> Set to measure transducer every 10 minutes and leave
transducer powered for 5 secs before measuring
The "River Increment" (RVI) parameter changes itsmeaningfromthe quadrature transducer and now
defines the river height recording resolution expressed in millimetres. The two parts of the
parameter are simply multiplied to give the required resolution. This can be used to provide filtering
when a sensor is sensitive or wave motion affects the reading.
On-line Help
RVI?
River Increment: Defines the change in river height that constitutes
the recorded river height event. River height sensor
resolution in feet times the recording multiplier
Syntax: RVI<CR> Displays the river inc parameter
RVI=0.01/05<CR> Sets river height sensor resolution to 0.01 &a
multiplier of 5 => a river height change of 0.05 = 1 event
The "River Height Reference" (RVHR) also changes its meaning from when used with a quadrature
transducer and now is an offset that is added to the river height as measured bythe transducer alone.
On-line Help
RVHR?
River Height Reference: Ref height as set during calibration or
routine maint when using quadrature transducer,
or offset added to 4-20mA transducer level.
Syntax: RvHR<CR> Displays the river height reference level
RvHR=006.00<CR> Sets river height ref to 6