Campbell Scientific 380, 385, 380M, 385M User Manual
Met One Rain Gage
Models 380 and 385
Revision: 2/08
Copyright © 1993-2008
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
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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
ii
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
1
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.
NOTE
3. Installation
3.1 Siting
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
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.
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.
®
rubber. This
2
3.2 Mounting
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.
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. 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.
NOTE
Remember to replace primary screen after a snowfall event.
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