BS 7843-3.2:2005
$142.49
Guide to the acquisition and management of meteorological precipitation data – Specifcation for raingauges – Tipping bucket gauges
| Published By | Publication Date | Number of Pages |
| BSI | 2005 | 24 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | BRITISH STANDARD |
| 2 | Committees responsible for this British�Standard |
| 3 | Contents |
| 5 | Introduction 1 Scope 2 Principle of operation 3 Performance specification 3.1 Static performance Table 1 – Summary of static performance requirements |
| 6 | Figure 1a) – Tipping bucket operation — Position “A” before tip event Figure 1b) – Tipping bucket operation — Position “B” after tip event |
| 7 | Figure 2 – Typical tipping bucket raingauge |
| 8 | 3.2 Dynamic performance Table 2 – Summary of dynamic performance requirements 4 Physical attributes |
| 9 | Table 3 – Summary of physical attribute requirements |
| 10 | Figure 3a – Typical TBR, sectional side view, labelled components |
| 11 | Figure 3b – Typical TBR, view from above, labelled components 4.1 Materials of construction 4.2 Finishes of materials 4.3 Minimum and maximum collecting area |
| 12 | 4.4 Septum ring or collector edge characteristics 4.5 Collecting funnel characteristics 4.6 Collector filters 4.7 Minimum and maximum height of the raingauge 4.8 Heater assemblies 5 Environmental considerations 5.1 Operating Table 4 – Summary of operational environmental considerations |
| 13 | 5.2 Storage Table 5 – Summary of storage environmental considerations 6 Installation requirements Summary of installation requirements 6.1 Mounting and fixing requirements 6.2 Levelling system 6.3 Level indication |
| 14 | 6.4 Provision for connector 7 Maintenance requirements Summary of maintenance requirements 7.1 Method of calibration adjustment 7.2 Maintainable components |
| 15 | 7.3 Period between cleaning and maintenance 7.4 Calibration process Figure 4 – Tipping bucket assembly |
| 16 | Figure 5 – Typical filter assembly |
| 17 | Annex A (normative) Calibration of tipping bucket raingauges A.1 Principle A.2 Common preparation elements for both calibration procedures A.2.1 Collector area A.2.2 Tipping bucket assembly A.2.3 Volume of water required |
| 18 | A.2.4 Flow rate of water A.2.5 Raingauge is level and secure A.3 Static calibration by burette A.3.1 Process overview A.3.2 Apparatus A.3.3 Consider the bucket assembly to be split into two halves, termed bucket A and bucket�B. A.3.4 Remove the outer casing or collector of the raingauge. Mount the burette centrally over the tippi… A.3.5 Pour enough water through the gauge to wet the system to achieve at least 10 tip events. Remove a… A.3.6 Pour water into bucket A until the bucket tips, ensuring that the flow rate is kept within the 10… A.3.7 Pour water into bucket B until the bucket tips, ensuring that the flow rate is kept within the 10… A.3.8 Repeat steps |
| 19 | A.3.9 Determine the average volume each bucket (A and B) achieved and compare it with the expected valu… A.3.10 Record the serial number of the raingauge, the actual calibration achieved, and the date and time… A.4 Static calibration by constant rate pump A.4.1 Process overview A.4.2 Apparatus A.4.3 Consider the bucket assembly to be split into two halves, termed bucket A and bucket�B. A general… A.4.4 Initial set-up — new or suspect TBRs A.4.5 Main calibration |
| 20 | Figure A.1 – Constant rate pump calibration facility |
| 21 | Figure A.2 – Detail of meniscus A.5 Calibration at higher rainfall rates A.5.1 Principle A.5.2 Assessment procedure |
| 22 | A.5.3 Using the assessment results |
