STAGE DISCHARGE RECORDER,SDR, NEVER LOSE DATA AGAIN.

SDR SPECIFICATIONS
Stage range	+/- 80 ft of the set value
Encoder	400 count / revolution optical encoder 5.5 revolution / second MAX
Clock	Internal real-time clock with battery backup (coin cell with 5+ year life). ±2 minutes a month (0 to +50C).
Recording intervals	15-minute default, 1, 5, & 10 minutes user selectable. 30 & 60 minute intervals also available.
Discharge calculation	Parshall Flume & Broad Crested Weir Equations plus general purpose equation with user-selectable constants
Volume total	Daily volume calculation and logging
Daily average stage & Volume	Computes and logs the average daily stage and volume every day at midnight
Operator interface	6-button front panel with two-line display and status lights. Buttons select menu options.
Available data	Station name, date/time, current stage, current discharge, current total, battery voltage & logged values of the stage & discharge, daily average stage, average discharge & total discharge.
Calibration	The user can use the front panel/PC/PDA to adjust the current stage to match a staff reading (optional password protection)
Setup data	All setup stored in non-volatile flash memory
Password	Can be configured to require a password for setup changes and stage adjustments
Log capacity	Over one (1) year of 15-minute stage data with accompanying daily average of discharge and midnight battery voltage
Log wrapping	PERMANENT LOG wraps when full (oldest data replaced by newest data). There is NO mechanism to erase the log.
Data downloads	Compatible with Pocket PC , PDA or laptop/desktop Windows PC
Event log	Any stage or setup changes are written to the event log.
Download time	Less than 6 minutes, even for a 6-month log
Download	Comma-separated variable (CSV)
Graphing data	PDA and laptop utilities provide data graphing
Status lights	2 on front panel show “heartbeat” & run/error status
Drive shaft	5/16” diameter with 1: threaded & milled flat for set screw, shaft is 2.5” above base.
Sealing	NEMA rated enclosure resists dripping water & spray
MODBUS	Supports MODBUS slave protocol with user-set address & baud rate
Float Wheels	Can operate with the following diameters: 18 inch, 375 mm, 1 foot.
Operating Temperature	-40°C to +60°C . The LCD operates to -10°C.
Data Connection	DB9 (female) for direct connection to PC/PDA The DB9 provides +5V on pin 9 with a capacity of 71ma. Provides a means to power external devices, such as BlueTooth.
Grounding	#8 ground stud with wing nut
SDI-12	One set of connections for SDI-12 on a terminal strip (Act as sensor or use to measure SDI-12 level of sensor.)
Battery Connection	Dual battery connections on a terminal strip and appropriate circuitry to allow a new battery to be installed before the old battery is removed
Battery Life	Operates on 5.5 to 16 vdc 3 to 9 months on standard gel cells (7 ah to 24 ah) 9 to 15 months on various series configurations of alkaline cells
Battery Voltage Log	Battery voltage logged ech day at midnight, battery life indicator available in display
Power Consumption	< 2.5 mA @ 12 VDC
Clock Backup	A coin cell backs up the internal real-time clock. Battery life is 5+ years.

RECOMMENDATIONS

1. Stilling well with minimum 8” diameter
2. 5/16” shaft float wheel/pulley with circumference of 12”, 18”, & 375mm. If the float wheel does not have an insulating hub, a PVC float must be used. (See Ordering Options)
3. Beaded wire/tape compatible with the float wheel.
4. Float/ counterweights.
5. 12-volt alkaline battery with capacity of at least 20 amp-hrs. (See Ordering Options).