Met One Rain Gage Models 380 and 385 Revision: 2/08 C o p y r i g h t © 1 9 9 3 - 2 0 0 8 C a m p b e l l S c i e n t i f i c , I n c .
Warranty and Assistance The MET ONE RAIN GAGE MODELS 380 AND 385 are warranted by CAMPBELL SCIENTIFIC, INC. to be free from defects in materials and workmanship under normal use and service for twelve (12) months from date of shipment unless specified otherwise. Batteries have no warranty. CAMPBELL SCIENTIFIC, INC.'s obligation under this warranty is limited to repairing or replacing (at CAMPBELL SCIENTIFIC, INC.'s option) defective products.
Met One Rain Gage Table of Contents PDF viewers note: These page numbers refer to the printed version of this document. Use the Adobe Acrobat® bookmarks tab for links to specific sections. 1. Introduction..................................................................1 2. Specifications ..............................................................2 3. Installation....................................................................2 3.1 Siting..............................................................
Met One Rain Gage Table of Contents Tables 4-1. Wiring for Pulse Channel Input.............................................................. 9 4-2. Wiring for Control Port Input................................................................. 9 7-1. Volume of Water for Recalibration ......................................................
Met One Rain Gage Models 380 and 385 1. Introduction Met One's tipping bucket rain or snow gage is used to measure rain or snow water equivalent on a continuous basis. The Model 380 rain gage is intended to measure rainfall during above freezing conditions. The Model 385 AC heated rain gage provides year round measurement of either rain or snow. In the standard versions Model 380/385, precipitation is measured in increments of 0.01 inches.
Met One Rain Gage Models 380 and 385 2. Specifications MODEL 380/385 RAIN GAGE Funnel: 12 inch (30.5 cm) Accuracy: ±0.5% < 0.5"(1.27 cm)/hr rate ±2.0% < 3.0"(7.62 cm)/hr rate Resolution: 380/385 0.01 inch Environmental Conditions: Temperature: 0°C to +50°C Humidity: 0 to 100% Dimensions: Weight: Height: Diameter: 7 pounds (3.2 kg) w/ 50 ft. signal cable 14" (35.5 cm) 12" (30.5 cm) MODEL 385 Specifications same as Model 380 unless listed below.
Met One Rain Gage Models 380 and 385 The rain or snow gage should be placed away from objects that obstruct wind. The minimum distance should be 2 times the height of the obstruction or more. 3.2 Mounting The rain or snow gage is designed to mount on a flat surface. Three equally spaced adjustable mounting legs are provided. The mounting legs are predrilled for 1/4" bolts on a 9.66" diameter bolt circle.
Met One Rain Gage Models 380 and 385 CM240 Mounting Bracket Level Adjustments Power Cable 1.5” IPS Pipe User-Supplied AC Power Termination Box User-Supplied AC Power and Conduit for Heated Snow Gage User-Supplied 1” Conduit for Signal Cable User-Supplied Concrete Pad 24” 8” FIGURE 3-1.
Met One Rain Gage Models 380 and 385 3.5” 1.5” 24” 14” FIGURE 3-2.
Met One Rain Gage Models 380 and 385 P/N 2196 (2) Plcs. 6” WHITE 3/8” 8” Cut Shield Off Flush to Jacket 3/8” WHITE SHIELD BLACK Clear Heat Shrink BLACK Heat Shrink (2) Plcs. P/N 9661 2” 8” 3/8” 3/8” BLACK WHITE GREEN Heat Shrink (2) Plcs. P/N 7805 Beldon #1934B ATTACH WHITE OF (SIGNAL CABLE) TO PIN 3 FIGURE 3-3.
Met One Rain Gage Models 380 and 385 Remove Primary Screen if Snow is Anticipated FIGURE 3-4.
Met One Rain Gage Models 380 and 385 $ $ # " ! %% &' () * + % '$ , " FIGURE 3-5. Connecting Heater Wires 4. Wiring WARNING Disconnect heater power before attempting to service or repair this equipment. Failure to do so may result in personal injury or death due to electrocution. The BLACK (Signal) lead connects to a pulse channel.
Met One Rain Gage Models 380 and 385 4.1 Heater Wiring Attach the power plug supplied with the Model 385 by following the instructions supplied with the plug. The electric heated snow gage requires 115VAC (50/60hz), 5 amps maximum, to operate the heater. (If supplying your own signal or power cable, refer to Figure 3-4 for an illustration of cable installation.
Met One Rain Gage Models 380 and 385 5. Datalogger Programming 5.1 CR10X Programming This section is for users who write their own programs. A datalogger program to measure this sensor can be created using Campbell Scientific’s Short Cut Program Builder software. You do not need to read this section to use Short Cut. The Model 385 rain gage is measured using the Pulse Count instruction configured for a switch closure. In all dataloggers, a multiplier of 0.
Met One Rain Gage Models 380 and 385 5.1.1 CR200 Series Programming 'CR200 Series 'Example program showing measurement of a 380/385 sensor every 10 seconds. 'Declare Public Variables and Units Public Rain_in Units Rain_in=inch 'Define Data Tables DataTable(Table1,True,-1) DataInterval(0,60,Min) Totalize(1,Rain_in,False) EndTable 'As an example store the data every 60 minutes. 'Main Program BeginProg Scan(10,Sec) 'MetOne 380/385 Rain Gauge measurement Rain_in: PulseCount(Rain_in,P_SW,2,0,0.
Met One Rain Gage Models 380 and 385 ‘Main Program BeginProg Scan(10,Sec,1,0) ‘Default Datalogger Battery Voltage measurement Batt_Volt: Battery(Batt_Volt) ‘MetOne 380/385 Rain Gauge measurement Rain_in: PulseCount(Rain_in,1,1,2,0,0.01,0) ‘Call Data Tables and Store Data CallTable(Table1) CallTable(Table2) NextScan EndProg 5.2 Control Port Programming The following examples measure a 380 and 385 rain gage using a control port on a datalogger. Wire the sensor as shown in Table 4-2. 5.2.
Met One Rain Gage Models 380 and 385 'Define Data Tables DataTable(Table1,True,-1) DataInterval(0,60,Min) Totalize(1,Rain_in,False) EndTable 'As an example store the data every 60 minutes. 'Main Program BeginProg Scan(10,Sec) 'MetOne 380/385 Rain Gauge measurement Rain_in: PulseCount(Rain_in,C2,2,0,0.01,0) ; Black wire connect to C2 'Call Data Tables and Store Data CallTable(Table1) NextScan EndProg 5.2.
Met One Rain Gage Models 380 and 385 6. Troubleshooting 6.1 Precipitation Symptom: No precipitation 1. Check that the sensor is wired to the Pulse Channel specified by the Pulse Count instruction. 2. Verify that the Configuration Code (Switch Closure), and Multiplier and Offset parameters for the Pulse Count instruction are correct for the datalogger type. 3. Disconnect the sensor from the datalogger and use an ohm meter to do a continuity check of the switch.
Met One Rain Gage Models 380 and 385 3. Pour the appropriate amount of water (see Table 7-1) into the inner funnel (i.e. 18.52 ml for 0.01 inches of rain / tip): Conversion Factors: 113.04 in2 (catch orifice area) x increment in inches. Tip to in3: 3 multiply by 16.3881. in to ml: ml to ounces: multiply by 0.03382. 4. Turn the cup adjustment screw, opposite the full bucket, up until the bucket assembly tips. Tighten the lock nut. 5. Repeat steps 3 and 4 for the opposite bucket. 6.
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