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Rain Gauge Calibration Tables

The calibration values presented in these tables are for use with the 260-2595 Tipping Bucket Rain Gauge Calibrator.

Rain Gauge Model # Funnel Size Calibrated Volume of Water
  150 ml 450 ml 750 ml 946 ml
8" RAIN GAUGES USING THE 1/16" ORIFICE
Factory calibration uses the 1/16" orifice (6"/hour) for 8" rain gauges. This rate give good overall results.
260-2500 (0.01") 8.0" 0.18" 0.55" 0.91" 1.15"
260-2501-A (0.01") 8.0" 0.18" 0.55" 0.91" 1.15"
260-2500M (1 mm) 8.0" 4.6 mm 13.8 mm 23. mm 29. mm
260-2501M-A (1 mm) 8.0" 4.6 mm 13.8 mm 23. mm 29. mm
8" RAIN GAUGES USING THE 1/32" ORIFICE
This size orifice produces a flow rate of 2"/hour and will take 35 minutes to complete.
260-2500 (0.01") 8.0" 0.19" 0.56" 0.94" 1.19"
260-2501-A (0.01") 8.0" 0.19" 0.56" 0.94" 1.19"
260-2500M (1 mm) 8.0" 4.8 mm 14.2 mm 24. mm 30. mm
260-2501M-A (1 mm) 8.0" 4.8 mm 14.2 mm 24. mm 30. mm
260-2505 (0.01") 7.874" 0.19" 0.56" 0.94" 1.18"
260-6011-A (0.01") 8.214" 0.17" 0.52" 0.86" 1.08"
260-6011-B (0.1 mm) 8.214" 4.4 mm 13. mm 22. mm 28. mm
12" RAIN GAUGES
260-2500-12 (0.01") 12" 0.08" 0.24" 0.40" 0.51"
260-2500M-12.1 (0.1 mm) 12" 2.1 mm 6.2 mm 10.3 mm 13.0 mm
OTHER RAIN GAUGES
110-WS-16RC & 260-6463/7852 (0.01") 6.5" 0.28" 0.83" 1.38" 1.74"
110-WS-18RG & 260-7048U (0.02") 2.1" x 4.9" 0.86" 2.58" 4.31" 5.43"
260-TE525 (0.01") 6.0" 0.32" 0.97" 1.62" 2.04"
260-TE525MM (0.1 mm) 9.664" 3.2 mm 9.7 mm 16.2 mm 20.4 mm


ORIFICE FLOW RATES FOR 8" DIAMETER RAIN GAUGES
Orifice Size inches/hour mm/hour
1/32" 2 50.8
1/16" 6 152.4
3/32" 12 304.8
1/8" 26 660.4
ORIFICE FLOW RATES FOR 260-2500-12 RAIN GAUGE
1/32" 0.77 n/a
1/16" 2.47 n/a
3/32" 4.93 n/a
1/8" 11.39 n/a
NOTES

For 260-2500 and 260-2501-A
0.01" of water = 8.24 ml
1 mm of water = 32.43 ml

For 260-2500-12
0.01" of water = 18.53 ml

For 260-6463, 260-7852, and 110-WS-16RC
0.01" of water = 5.44 ml
Flow rate is 3.5"/hr with the 1/32" orifice.

For 260-TE525
0.01" of water = 4.63 ml
Flow rate is 4.0"/hr with the 1/32" orifice.

For 260-TE525MM
1 mm of water = 4.63 ml
Flow rate is 100 mm/hr with the 1/32" orifice.

For 110-WS-25RG (260-0111) same values as 260-2501-A (8" diameter)
0.01" of water = 8.24 ml with the 1/32" orifice.
Flow rate is 2.0"/hr with the 1/32" orifice.

For 260-52203 (0.1 mm) all flow rates are too fast.
Use a 10 ml syringe (10 ml = 5 tips).
Injecting 10 ml in 1 minute gives a flow rate equal to 1.0"/hr.

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