2 Overview TPG, Single Cell TPG-0001-1 Sutron’s Total Precipitation Gauge (TPG) is a weighing bucket gauge with a built-in logger designed for remote measurement of precipitation. The TPG can be equipped with multiple load sensors for added redundancy and reliability. Sutron designed the TPG using technology proven in the NWS Fischer Porter Rebuild kit program. Instead of refurbishing an ageing Fischer Porter Gauge, many users will find it easier to simply replace with Sutron’s TPG. TPG, Single CellTPG
3 TPG Applications Hydro-Met monitoring systems Municipal hydrology Flood warning systemsStormwater monitoring networksWater balance modelsWatershed and catchment basin studiesClimate change studiesTropical and arctic monitoringTipping bucket upgradesReplacement of Fischer/Porter gaugesCRN -- Climate reference networkAWS – automatic weather stationsASOS/AWOS – Automated Weather Observing System (airports)NWS Co-op modernization
4 TPG FeaturesMeasures all forms of precipitation: drizzle, rain, sleet, snow, graupel, and hail.Optional Wind Shield to increase catchment of precipitation – studies show that gauges without shields miss 25-50% of solid precipitation in windy environments.No moving parts – greater reliability and lower maintenance (less clogging) than tipping buckets.Optional heater – eliminates capping of the sensor in heavy snows or areas with riming ice (requires line power).High capacity – 36” (914mm) precipitation – with option to expand range to 72” or higher using auto-drain.Based on NWS Precip Gauge Upgrade technology being used in over 1000 stations.SDI-12 interface to Satlink, IridiumLink, GPRS/CDMALink or other loggersWMO compliant (manual 306, No 8)Built-in logger for data redundancy to station logger, or can act as a standalone logging sensor.Low power consumption (<1ma standby) for long life of battery.NIST traceable factory calibration with simple field verification/calibration.Simple mounting on 4.5” OD pipe
5 TPG SpecificationsMeasurements: Precipitation, Precip rate, Internal Temp, BatteryAutomeasure Interval : 1 second to 24 hoursMeasurement Technique: Precision hermetically sealed load cellAccuracy: 0.02" (0.6mm) -25°C to +60°CRange: 36" (914 mm) standard, >72" (1800 mm) with optional drain kitEnclosure: UV Resistant ABS plastic Cover, 8" diameter aluminum inlet with knife edge. Cast aluminum base with 4" pipe mount (for 4.5" OD pipe)Communication Ports: SDI-12, RS232Operating Temperature: -40°C to +60°CBuilt-In Flash Memory: 4 MB (>300,000 readings)Clock Accuracy (at 0°C – 40°C): 20 seconds per monthPower Requirements: VDCCurrent Drain: VDC standby, 5ma activeCommunication Protocols: MODBUS, SDI-12
6 TPG Operation Theory & Components 8” diameter opening allows all types precipitation to fall into the collection bucketOptional heater keeps opening free from snow and iceOil layer reduces evaporationAntifreeze in bucket melts snow/icePrecision load cell weighs the precipitationElectronics convert weights into precipitation amounts, logs data, and sends data to main station logger/telemetryOptional drain kit empties bucket when it precipitation reaches 70% capacityMounts on 4.5” OD pipe
7 Windscreen BenefitsWMO is testing the TPG in the Solid Precipitation Inter-Comparison Experiment (SPICE).TPG3 with Alter shield catches 25-50% more than TPG1 without shield.Windscreen Example
8 Client Portfolio – U.S.A USACE USGS National Park Service Bureau of Reclamation
9 Client Portfolio – International WMOHoskin ScientificAnyone else?
10 Installation Examples Master StationDemo Station – Sutron Headquarters Rooftop, Sterling VA
11 Installation Examples Gated Weather Station with TPG - Kabul, Afghanistan
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