Campbell Scientific 52202 User Manual

52202 Electrically Heated Rain

and Snow Gage

Revision: 5/11

Copyright © 2010-2011

Campbell Scientific, Inc.

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. A completed form

52202 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. General Description..................................................... 1

2. Specifications ..............................................................1

3. Installation....................................................................2

3.1 Siting.........................................................................................................2

3.2 Mounting ..................................................................................................2

4. Wiring............................................................................ 4

4.1 Heater Wiring ...........................................................................................4

4.2 Wiring to a Pulse Channel ........................................................................4

4.3 Wiring to a Control Port ...........................................................................5

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

5.1 Pulse Channel Example Programs............................................................5

5.1.1 CR1000 Example Program .............................................................6

5.1.2 CR200(X) Series Example Program...............................................6

5.1.3 CR10X Example Program ..............................................................7

5.2 Control Port Example ...............................................................................7

5.2.1 CR1000 Example Program .............................................................8

5.2.2 CR10X Example Program ..............................................................9

6. Troubleshooting ..........................................................9

6.1 Precipitation..............................................................................................9

7. Maintenance ............................................................... 10

Figures

3-1. 52202 Precipitation Gage ........................................................................2

3-2. The CM220 Mounted to a Crossarm.......................................................3

3-3. The CM216 Atop a Stainless-Steel Tripod .............................................3

Tables

4-1. Wiring for Pulse Channel Input ..............................................................4

4-2. Wiring for Control Port Input..................................................................5

5-1. Multipliers ...............................................................................................5

i

52202 Electrically Heated Rain and Snow Gage

1. General Description

RM Young’s Model 52202-L is an electrically heated precipitation gage that
provides year-round measurement of rain or snow. This gage requires a
reliable source of 24 Vac power. It includes a wall transformer that plugs into
a wall socket and provides 24 Vac.

Output is a switch closure for each bucket tip.

A –L after the model number indicates that the cable length is specified when
ordering. Throughout this manual, the rain gage will be referred to as the

52202.

The 260-953 Alter-Type Wind Screen can be used with the 52202 to minimize
the effect of strong winds on the 52202’s measurements.

2. Specifications

Sensor Type: Tipping bucket with magnetic reed switch

NOTE

Accuracy: 2% up to 1 in. h
3% up to 2 in. h

Resolution: 0.004 in. (0.1 mm)

Orifice Diameter: 6.3 in. (16 cm)

Catchment Area: 31 in.

Temperature Range: -20° to +50°C

Humidity Range: 0 to 100%

Power: 18 Watts @ 24 Vac

Contact Rating: 24 Vac/dc, 500 mA maximum

Dimensions
Diameter: 7.3 in (18.5 cm)
Height: 11.8 in. (30 cm)

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.

-1

(25 mm h-1);

-1

(50 mm h-1)

2

(200 cm2)

1

52202 Electrically Heated Rain and Snow Gage

3. Installation

NOTE

3.1 Siting

3.2 Mounting

The 260-953 Alter-Type Wind Screen’s siting information and
installation procedure are provided in the 260-953 manual.

The 52202 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 cm. above the ground. It should be high enough to be above the average
snow depth. The ground surface around the rain gage should be natural
vegetation or gravel. It should not be paved.

The gage should be placed away from objects that obstruct the wind. The
distance should be two to four times the height of the obstruction.

The 52202 precipitation gage uses a clamp to fasten onto the 3659 12-in.-long,
aluminum pipe or to a user-supplied 1-in. IPS pipe (see Figure 3-1). The 3659
pipe is shipped with the 52202 gage.

2

Housing

Base

Clamp

FIGURE 3-1. 52202 Precipitation Gage

52202 Electrically Heated Rain and Snow Gage

m

The pipe attaches to a CM202, CM204, or CM206 crossarm via a CM220
Right Angle Mounting Bracket (see Figure 3-2). The crossarm attaches to a
tripod mast, tower leg, CM300-series mounting pole, or a user-supplied
vertical pipe (1.0-in. to 2.1-in. OD).

Crossar

CM220

FIGURE 3-2. The CM220 Mounted to a Crossarm

Alternatively, the 3659 pipe can be attached to the top of our stainless-steel
tripods via the CM216 Sensor Mounting Kit. The CM216 extends 4-in. above
the mast of a stainless-steel CM110, CM115, or CM120 tripod (see Figure
3-3).

Fits in Mast

FIGURE 3-3. The CM216 Atop a Stainless-Steel Tripod

3

52202 Electrically Heated Rain and Snow Gage

After mounting the 52202, level the gage and remove the shipping retainer by
performing the following procedure:

1. Loosen the three screws that retain housing to base assembly (see Figure

3-1). Carefully lift housing free of base.

2. Remove shipping retainer from bucket. Verify that bucket tips freely.

3. Adjust leveling screws until bulls eye level is centered.

4. Replace housing and retighten screws.

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.

4.1 Heater Wiring

Attach the power plug supplied with the 52202 by following the instructions
supplied with the plug. This gage requires an adequately grounded, reliable
source of 24 Vac power.

4.2 Wiring to a Pulse Channel

NOTE

When Short Cut software is used to generate the datalogger
program, the sensor should be wired to the channels shown on
the wiring diagram created by Short Cut.

The 52202 is typically wired to a datalogger’s pulse channel (see Table 4-1).

TABLE 4-1. Wiring for Pulse Channel Input

Color

Description

CR800
CR1000
CR3000
CR5000

CR500
CR510,
CR10(X)

21X,
CR7,
CR23X

CR200(X)
Series

4

Black Signal Pulse

Channel

White Signal

Return

Clear Shield

Pulse
Channel

G

G

Pulse
Channel

P_SW

4.3 Wiring to a Control Port

Dataloggers listed in Table 4-2 have the capability of counting switch closures
on some of their control ports. When a control port is used, the return from the
rain gage switch must be connected to +5 volts on the datalogger.

TABLE 4-2. Wiring for Control Port Input

52202 Electrically Heated Rain and Snow Gage

Color

Description

CR800
CR1000
CR3000

Black Signal Control Port C2/P3 Control

White Signal

5 V 5 V 5 V 5 V

Return

Clear Shield

The CR10 does not support the use of control port inputs with the Pulse Count
instruction.

5. Datalogger Programming

NOTE

This section is for users who write their own programs. A
datalogger program to measure this sensor can be generated
using Campbell Scientific’s Short Cut Program Builder software.
You do not need to read this section to use Short Cut.

Precipitation is measured using a Pulse Count with a switch closure
configuration code. The multiplier used in the Pulse Count instruction
determines the units in which rainfall is reported (see Table 5-1).

CR500
CR510

CR10X

CR23X

Control

Port

G

Port

TABLE 5-1. Multipliers

Rain Gage 0.01 in. 1 in. 0.1 mm 1 mm

52202 0.394 0.00394 1.0 0.1

5.1 Pulse Channel Example Programs

The following example programs use a pulse channel to read the output from
the precipitation gage. The CR1000 example will also work with the CR800,
CR850, CR3000, and CR5000. CR9000(X) programming is similar to the
CR1000 except it has an additional parameter in the PulseCount instruction to
specify the pulse module’s slot.

The CR10X program will also work with the CR500, CR510, CR10, 21X or
CR23X. CR7 programming is similar to the CR10X but has an additional
parameter in the PulseCount instruction to specify the slot that the Pulse Card
is in.

5

52202 Electrically Heated Rain and Snow Gage

5.1.1 CR1000 Example Program

'CR1000

'RM_Young Tipping Blk > P1
' Wht > ground
'Cabling for heater goes to 24VAC power supply

Public Rain_mm
Units Rain_mm=mm
DataTable(Rain,True,-1)
DataInterval(0,60,Min,0)
Totalize(1,Rain_mm,FP2,0)
EndTable

BeginProg
Scan(1,Sec,1,0)
PulseCount(Rain_mm,1,1,2,0,0.1,0)
CallTable(Rain)
NextScan
EndProg

5.1.2 CR200(X) Series Example Program

'CR200(X) Series

'RM_Young Tipping Blk > P_SW
' Wht > ground
'Cabling for heater goes to 24VAC power supply

'Declare Variables and Units

Public Rain_mm

Units Rain_mm=mm

'Define Data Tables

DataTable(Rain,True,-1)
DataInterval(0,60,Min)
Totalize(1,Rain_mm,0)
EndTable

'Main Program

BeginProg
Scan(1,Sec)

'52202 Rain Gage measurement Rain_mm:

PulseCount(Rain_mm,P_SW,2,0,0.1,0)

'Call Data Tables and Store Data

CallTable(Rain)
NextScan
EndProg

6

52202 Electrically Heated Rain and Snow Gage

5.1.3 CR10X Example Program

;{CR10X}

*Table 1 Program
01: 1.0000 Execution Interval (seconds)

1: Pulse (P3)
1: 1 Reps
2: 1 Pulse Channel 1
3: 2 Switch Closure, All Counts
4: 3 Loc [ Rain_mm ]
5: 0.1 Multiplier
6: 0 Offset

2: If time is (P92)
1: 0 Minutes (Seconds --) into a
2: 60 Interval (same units as above)
3: 10 Set Output Flag High (Flag 0)

3: Set Active Storage Area (P80)
1: 1 Final Storage Area 1
2: 101 Array ID

4: Real Time (P77)
1: 1220 Year,Day,Hour/Minute (midnight = 2400)

5: Totalize (P72)
1: 1 Reps
2: 3 Loc [ Rain_mm ]

*Table 2 Program
01: 0 Execution Interval (seconds)

*Table 3 Subroutines

End Program

5.2 Control Port Example

The following example programs use a control port to read the output from the
precipitation gage. The CR1000 example will also work with the CR800,
CR850, and CR3000. The CR10X program will also work with the CR500,
CR510, or CR23X.

7

52202 Electrically Heated Rain and Snow Gage

5.2.1 CR1000 Example Program

'CR1000

'RM_Young Tipping Blk > C4
' Wht > 5v
'Cabling for heater goes to 24VAC power supply

'Declare Variables and Units

Public BattV
Public RM_Young

Units BattV = Volts
Units RM_Young =inch

DataTable(OneMin,True,-1)
DataInterval(0,1,Min,10)
Totalize (1,RM_Young,FP2,False)
EndTable

'Define Data Tables

DataTable(OneDay,True,-1)
DataInterval(0,1440,Min,10)
Minimum(1,BattV,FP2,False,False)
Totalize (1,RM_Young,FP2,False) 'RM Young tipping bucket
EndTable

'Main Program

BeginProg
Scan(5,Sec,1,0)

'Default Datalogger Battery Voltage measurement BattV

PanelTemp (PTemp,_60Hz)
Battery(BattV)

'RM Young Heated Rain Gage measurement Rain_in

PulseCount(RM_Young,1,14,2,0,0.0039,0)

'Call Data Tables and Store Data

CallTable(OneMin)
CallTable(OneDay)
NextScan
EndProg

8

52202 Electrically Heated Rain and Snow Gage

5.2.2 CR10X Example Program

;{CR10X}
;

*Table 1 Program
01: 1 Execution Interval (seconds)

1: Pulse (P3)
1: 1 Reps
2: 8 Control Port 8 (switch closure only) ;Black wire connect to C8
3: 2 Switch Closure, All Counts
4: 1 Loc [ Rain_mm ]

5. 0.1 Multiplier
6: 0 Offset

2: If time is (P92)
1: 0 Minutes (Seconds --) into a
2: 60 Interval (same units as above)
3: 10 Set Output Flag High (Flag 0)

3: Set Active Storage Area (P80)
1: 1 Final Storage Area 1
2: 101 Array ID

4: Real Time (P77)
1: 1220 Year,Day,Hour/Minute (midnight = 2400)

5: Totalize (P72)
1: 1 Reps
2: 1 Loc [ Rain_mm ]

*Table 2 Program
02: 0.0000 Execution Interval (seconds)

*Table 3 Subroutines

End Program

Output Instruction 72, Totalize, is used in the output section of the program to
output the total rainfall over the output interval. This section should be
executed every scan and not placed in a subroutine or conditional statement.

6. Troubleshooting

6.1 Precipitation

Symptom: No Precipitation

1. Check that the sensor is wired to the pulse channel or control port

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.

9

52202 Electrically Heated Rain and Snow Gage

3. Disconnect the sensor from the datalogger and use an ohm meter to do a

continuity check of the switch. The resistance measured at the terminal
block on the inside of the bucket between the black and white leads should
vary from infinite (switch open) when the bucket is tipped, to less than an
ohm when the bucket is balanced.

7. Maintenance

The rain gage should be inspected periodically. Accumulated dirt and debris
should be cleaned from funnel, screen and bucket assembly. Electrical
connections should be inspected and cleaned. Leveling screws may be
readjusted at this time.

Periodic recalibration may be desirable to ensure measurement accuracy. The
following calibration check is advised every 12 months.

1. With the rain gage properly leveled, slowly pour a measured volume of

water into the collection funnel. The rate should be about 10 ml per
minute which is approximately 1-in. per hour. The bucket should tip five
times for each 10 ml of water. For example, 100 ml should give a count of
50 ±1. Bucket tips may be counted manually or with a counter connected
to the rain gage terminals.

2. If the count shows an error of more than 2%, adjust the calibrating screws

to correct the error. Raise the screws if the count is low, lower the screws
if the count is high. Always adjust both screws equally.

10

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