Campbell 385 Manuel utilisateur

Met One Rain Gage

Models 380 and 385

Revision: 2/08

Campbell Scientific, Inc.

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. The customer shall assume all costs of removing, reinstalling, and

shipping defective products to CAMPBELL SCIENTIFIC, INC. CAMPBELL

SCIENTIFIC, INC. will return such products by surface carrier prepaid. This

warranty shall not apply to any CAMPBELL SCIENTIFIC, INC. products

which have been subjected to modification, misuse, neglect, accidents of

nature, or shipping damage. This warranty is in lieu of all other warranties,

expressed or implied, including warranties of merchantability or fitness for a

particular purpose. CAMPBELL SCIENTIFIC, INC. is not liable for special,

indirect, incidental, or consequential damages.

Products may not be returned without prior authorization. The following

contact information is for US and International customers residing in countries

served by Campbell Scientific, Inc. directly. Affiliate companies handle

repairs for customers within their territories. Please visit

www.campbellsci.com to determine which Campbell Scientific company

serves your country. To obtain a Returned Materials Authorization (RMA),

contact CAMPBELL SCIENTIFIC, INC., phone (435) 753-2342. After an

applications engineer determines the nature of the problem, an RMA number

will be issued. Please write this number clearly on the outside of the shipping

container. CAMPBELL SCIENTIFIC's shipping address is:

CAMPBELL SCIENTIFIC, INC.

RMA#_____

815 West 1800 North

Logan, Utah 84321-1784

CAMPBELL SCIENTIFIC, INC. does not accept collect calls.

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.........................................................................................................2

3.2 Mounting ..................................................................................................3

3.3 Screen Removal........................................................................................3

4. Wiring............................................................................8

4.1 Heater Wiring ...........................................................................................9

4.2 Wiring for Pulse Channel Input................................................................9

4.3 Wiring for Control Port Input...................................................................9

5. Datalogger Programming..........................................10

5.1 CR10X Programming.............................................................................10

5.1.1 CR200 Series Programming..........................................................11

5.1.2 CR1000 Programming..................................................................11

5.2 Control Port Programming .....................................................................12

5.2.1 CR1000 Programming..................................................................12

5.2.2 CR200 Series Programming..........................................................12

5.2.3 CR10X Programming ...................................................................13

6. Troubleshooting ........................................................14

6.1 Precipitation............................................................................................14

7. Maintenance and Calibration....................................14

7.1 Customer Calibration..............................................................................14

7.2 Factory Recalibration..............................................................................15

Figures

1-1. 385 Met One Rain and Snow Gage.........................................................1

3-1. Typical Snow Gage Installation ..............................................................4

3-2. Pedestal Base Options .............................................................................5

3-3. Connecting Signal Cable Leads ..............................................................6

3-4. Remove Screen if Snow is Anticipated...................................................7

3-5. Connecting Heater Wires ........................................................................8

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...................................................... 15

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.

The Model 380 rain gage works by collecting rainfall in the 12 inch collection

funnel and metering the rain into the tipping bucket assembly. When 0.01

inches of rainfall are collected, the tipping bucket assembly tips and activates a

mercury switch. The switch closure is recorded by the datalogger pulse

channel. When the bucket tips, the water drains out the screened base of the

gage. In the case of the Model 385 heated rain gage, snowfall is captured in

the collection funnel and melted by the heater element. After melting, the

snow water is metered into the tipping bucket assembly for measurement of the

snow water equivalent.

FIGURE 1-1. 385 Met One Rain and Snow Gage

The 385 ships with:

(1) Calibration Sheet

(1) Instruction Manual

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: 7 pounds (3.2 kg) w/ 50 ft. signal cable

Height: 14" (35.5 cm)

Diameter: 12" (30.5 cm)

MODEL 385

Specifications same as Model 380 unless listed below.

Environmental Conditions:

Temperature: -20°C to +50°C

Humidity: 0 to 100%

Weight: 12.2 pounds (5.57 kg) w/ 50' power/signal cable

Heater Power Specification:

Voltage: 115 VAC (50/60 Hz)

Current: 5 amps maximum

Heater: 300 W Cartridge Element

The black outer jacket of the cable is Santoprene® rubber. This

compound was chosen for its resistance to temperature extremes,

moisture, and UV degradation. However, this jacket will

support combustion in air. It is rated as slow burning when

tested according to U.L. 94 H.B. and will pass FMVSS302.

Local fire codes may preclude its use inside buildings.

NOTE

3. Installation

3.1 Siting

The rain or snow gage should be mounted in a relatively level spot which is

representative of the surrounding area. The lip of the funnel should be

horizontal and at least 30 inches above the ground. Install the snow gage high

enough to prevent burial by snow during the winter months. The ground

surface around the rain gage should be natural vegetation or gravel. The gage

should not be installed over a paved or concrete surface. Refer to Figure 3-1

for an illustration of gage installation.

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 pre-

drilled for 1/4" bolts on a 9.66" diameter bolt circle. A mounting bracket is

available from Campbell Scientific (CM240) to install either the rain or snow

gage. The mounting bracket provides additional adjustment for leveling the

rain or snow gage. The CM240 base helps level the rain gage, ensuring a more

accurate measurement. The base may be attached to a CM300-Series

Mounting Pole or to a user-supplied 1.5 IPS (1.9” OD, unthreaded) pipe. The

pipe should be long enough to place the gage's orifice at a one-meter height.

The pole or pipe can be placed directly into a concrete foundation, attached to

a concrete foundation using J-bolts, or self-supporting with legs (see Figure 3-

2). A concrete pad is recommended. A typical snow gage installation is

illustrated in Figure 3-1.

Loosen the three screws and lift the housing assembly from the base. Adjust

the three slotted feet on the base of the rain gage and/or the three nuts on the

CM240 to level the gage.

Remove the rubber shipping band securing the stainless steel tipping bucket

assembly. Verify the bucket tips freely and that all the adjusting screws are

tight. Replace the housing assembly and tighten the three screws to secure the

housing to the base. Level the rain gage after mounting it.

3.3 Screen Removal

If snowfall is anticipated, remove the primary screen from funnel, as shown in

Figure 3-3.

Remember to replace primary screen after a snowfall event.

NOTE

Met One Rain Gage Models 380 and 385

24”

8”

FIGURE 3-1. Typical Snow Gage Installation

User-Supplied AC Power

Termination Box

User-Supplied AC Power

and Conduit for Heated

Snow Gage

User-Supplied

Concrete Pad

Power Cable

CM240 Mounting Bracket

Level Adjustments

1.5” IPS Pipe

User-Supplied 1” Conduit

for Signal Cable

Met One Rain Gage Models 380 and 385

3.5”

1.5”

24”

14”

FIGURE 3-2. Pedestal Base Options

Met One Rain Gage Models 380 and 385

P/N 2196 (2) Plcs.

8”

6” Cut Shield Off Flush to Jacket 3/8”

3/8”

WHITE WHITE

SHIELD

BLACK

BLACK Clear Heat Shrink

Heat Shrink (2) Plcs. P/N 9661

FIGURE 3-3. Connecting Signal Cable Leads

TTACH WHITE OF (SIGNAL CABLE) TO PIN 3

Heat Shrink (2) Plcs. P/N 7805 Beldon #1934B

8” 2”

3/8”

3/8” BLACK

WHITE

GREEN

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