Specifications

HYDROLOGICAL SERVICES
DL3 100-011 IMP
Issue 2: 15/11/2005
of the specific TBRG used as well as the number of tips that defines one rainfall event - this
determines the resolution and the rate at which flash memory is used. See section 4.1.10. for more
information on these commands.
Three separate "Rainfall Alarms" (RAL1, RAL2, RAL3) may be programmed in a logger that has
a communication path to a computer. An alarm will cause the logger to perform a certain sequence
(defined by the CALL, CALL NUMBER, and CLEAR parameters) that will dial out through a
modem to a computer and send a rainfall request message. Rainfall alarm 1 (RAL1) is a threshold
alarm that is triggered when the rainfall since 09:00 exceeds the RAL1 parameter. Rainfall alarms
2 and 3 (RAL2, RAL3) are rate of rain alarms that monitor the amount of rain in a defined period.
Note that the master alarm flag must be enabled (AL=on) before alarm checking is performed. See
section 4.1.2. for more information on these commands.
When a quadrature sensor is not being used, a link between the Quad A input and Gnd will allow
two separate events to be logged into the rainfall log ("Connect" and "Disconnect") that willoccur
whenthe plug that is connected into the black marked socket is removed or plugged in. This allows
an event to be logged during routine maintenance of the TBRG, without the need for extra
equipment.
3.2.4 Quadrature River Sensor + Parameters
The quadrature river height sensor has several parameters that allow characterisation of the sensor
being used as well as alarm criteria that will be specific to the location that the sensor. The "River
Channel ID" (RVCHID) is a 7 digit user definable number that should be set to uniquely set to
identify the river channel. The "River Increment" (RVI) parameter defines the actual mechanical
or electrical resolution expressed as millimetres of river height as well as a multiplier. The "River
Height Reference" (RVHR) is the height from which the river height data is referenced. (ie. The
river height as read from a staff gage during routine calibration) See section 4.1.12. for more
information on these commands.
Three separate "River Alarms" (RVAL1, RVAL2, RVAL3) may be programmed in a logger that
has a communication path to a computer. An alarm will cause the logger to perform a certain
sequence (defined by the CALL, CALL NUMBER, and CLEAR parameters) that will dial out
through a modem to a computer and send a river request message. River alarm 1 and 2 (RVAL1,
RVAL2) are threshold alarms that are triggered when the river height exceeds the RVAL1 or
RVAL2 parameters. Rainfall alarm 3 (RVAL3) is a rate of river change alarm that monitors the
rise or fall of a river in a defined period. Note that the master alarm flag must be enabled (AL=on)
before alarm checking is performed. See section 4.1.2. for more information on these commands.
3.2.5 Analog River Sensor 4-20mA + Parameters
The analog 4-20mA river height transducer has several parameters that allow characterisation of
the transducer being used as well as alarm criteria that will be specific to the location that the
transducer. The "River Channel ID" (RVCHID) is a 7 digit user definable number that should be
set to uniquelyset to identify the river channel. The "Transducer Reference" (TXR) parameter
defines the 20mA depth expressed in metres of water. The "Transducer Interval" (TXI) parameter
defines the frequency that analog measurements are made as well as the time that the transducer