Campbell 05103 Instruction Manual - 5.  Maintenance and Repairs

05103, 05106, and 05305 R.M. Young Wind Monitors

4

21Xs without OSX PROMS and CR7s without OS7 PROMS

(dataloggers purchased prior to March 1989 and August  1991

respectively, and not updated) do not have the option of

outputting frequency in hertz.  Program Instruction 3 with

configuration code 11 (pulses per execution interval).  The

multiplier from Table 4-1 is divided by the execution interval in

seconds to obtain the multiplier used with code 11.  For example,

with a 10-second execution interval, the multiplier for

meters/second with the 05103 would be 0.0980/10 = 0.0098.

The offset remains zero.

4.2  Wind Direction Instruction Code

The wind direction sensor is a potentiometer that is measured as a “half

bridge”.  The output ranges from 0 mV at 0 degrees to the excitation voltage at

355 degrees.  In dataloggers programmed with Edlog, measure the wind

direction with Instruction 4 (Excite, Delay, and Measure).  CR200 series

dataloggers use the ExDelSE instruction and other CRBasic dataloggers use the

BRHalf instruction.  In general, a delay of 1 (0.01 seconds) is sufficient when

lead lengths are less than 100 feet.  If the cable is 100 to 1000 feet, use a delay

of 5 (0.05 seconds).  The wind direction potentiometer has a five degree

deadband between 355 and 360 degrees; therefore, the maximum signal is at

355 degrees.  The result of the BRHalf instruction prior to applying the

multiplier is measured mV/Excitation mV; therefore, the multiplier is 355.  The

other measurement result is the measured mV; the multiplier with these

instructions is 355/Excitation Voltage.  The offset is zero.  The parameters to

be used with each datalogger are listed in Table 4-2.

TABLE 4-2.  Instruction 4 Parameters for Wind Direction

CR10(X)

21X

CR7

Measurement Range

2500 mV, slow

5000 mV, slow

5000 mV, fast

Excitation Voltage

2500 mV

5000 mV

5000 mV

Multiplier

0.142 deg/mV

0.071 deg/mV

0.071 deg/mV

Offset

0

0

0

5.  Maintenance and Repairs

R.M. Young suggests the anemometer bearings be inspected at least every 24

months.  Please refer to the R.M. Young manual for maintenance information.

Contact R.M. Young's customer service department directly to obtain repair

cost estimates and authorization for return of the unit.  Their phone number is

(616) 946-3980.

NOTE