PDF《Met One 034A-LC Windset》

3 0.7990 0.2811 mph CR10(X) or 21X

3 1.789 .629 degrees CR10(X) or 21X

5 720

0 034A Windsets purchased directly from Met One Instruments have a different configuration on the

6 pin connector. In addition, they do not have the

10 k? resistor on the excitation line. The wiring diagram and the multiplier and offset, for wind direction, are different than the examples in this document. NOTE 5.1 Program ;

{CR10X} ;

*Table

1 Program 01:

10 Execution Interval (seconds) 1: Pulse (P3) 1:

1 Reps 2:

1 Pulse Channel

2 3:

22 Switch Closure, Output Hz 4: 1* Loc [ WndS_m_s ] 5: 0.7990 Mult 6: 0.2811 Offset ;

Set the wind speed to zero if the wind is not blowing. ;

2: If (XF) (P89) 1: 1* X Loc [ WndS_m_s ] 2:

1 = 3: 0.2811 F 4:

30 Then Do 3: Z=F (P30) 1:

0 F 2:

0 Exponent of

10 3: 1* Z Loc [ WndS_m_s ]

3 Met One 034A-LC Windset for MetData1 4: End (P95) 5: AC Half Bridge (P5) 1:

1 Reps 2:

25 ±

2500 mV

60 Hz Rejection Range 3:

3 SE Channel 4:

2 Excite all reps w/Exchan

3 5:

2500 mV Excitation 6: 2* Loc [ WndD_deg ] 7:

720 Mult 8:

0 Offset 6: If time is (P92) 1:

0 Minutes (Seconds --) into a 2:

30 Interval (same units as above) 3:

10 Set Output Flag High (Flag 0) 7: Real Time (P77) 1:

0110 Day,Hour/Minute 8: Wind Vector (P69) 1:

1 Reps 2:

0 Samples per Sub-Interval 3:

00 S, θu, &

σ(θu) Polar** 4: 1* Wind Speed [ WndS_m_s ] 5: 2* Wind Direction [ WndD_deg ] -Input Locations-

1 WndS_m_s

2 WndD_deg * Proper entries will vary with program input location assignments. ** Average wind speed, average unit vector wind direction, standard deviation of unit vector wind direction 6. Sensor Maintenance

1 Month ? Do a visual/audio inspection of the anemometer at low wind speeds. Verify that the cup assembly and wind vane rotate freely. Inspect the sensor for physical damage. Verify cups and vane are tight.

6 Months ? Replace anemometer bearings if operating under harsh conditions

4 Met One 034A-LC Windset for MetData1

1 Year ? Replace anemometer bearings. Contact Campbell Scientific for a Return Materials Authorization (RMA) number at (435) 753-2342.

2 Years ? Replace the wind vane potentiometer and bearings. Contact Campbell Scientific for a Return Materials Authorization (RMA) number at (435) 753-2342. 7. Long Lead Lengths When lead lengths greater than

200 feet are required to measure the 034A, use the DC Half Bridge instruction, Instruction 4, with a

20 millisecond delay to measure wind direction. The delay increases the settling time before the measurement is made. Use a

2500 mV excitation and the

2500 mV measurement range. The

60 Hz rejection option can not be used with the DC Half Bridge instruction, when the delay is not zero. Do not use long lead lengths in electrically noisy environments. CAUTION TABLE 7-1. Multiplier and Offset for Wind Direction when using Lead Lengths Greater than

200 Feet Units Instru........