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Summary of Contents for Met One Instruments 020C
- Page 1 MODEL 020C WIND DIRECTION SENSOR OPERATION MANUAL Document No 020C-9800...
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Page 2: General Information
OPERATION MANUAL GENERAL INFORMATION The Model 020C Wind Direction Sensor uses a lightweight, vane and a micro torque potentiometer to produce an analog voltage output proportional to wind direction. An internal heater reduces moisture for extended bearing life. The sensor mounts in a crossarm assembly, such as the Met One Instruments’... -
Page 3: Installation
D. Model 042 Telescopic Orientation Fixture. INSTALLATION Model 020C Wind direction Sensor Installation A. Select output voltage range. Slide outer cover down to expose circuit board. Jumper E1 (at top of 2840 board) should be in 5v position for 0-5v output, or 2.5v position for 0-2.5v output. - Page 4 (Refer to Figure 2-1 “Typical 020C Installation”). The Orientation screw located on the stem of the sensor is to be oriented so that it points south. Proceed as follows: A. Tape the sensor hub and column together so that the notches on each part are exactly aligned.
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Page 6: Operational Checkout
180q. 020C Wind Direction Sensor Check-Out (with 540q conversion electronics) A. With the sensor connected to the input, upon movement of the sensor’s vane in a clockwise direction (as seen from above), the module’s output will move up-... - Page 7 Section 4.5 wind direction output below 2-5 020C Wind Direction Sensor: 6-12 Month Periodic Service (Refer to Assembly Drawing) A. At the crossarm assembly, disconnect the quick disconnect plug from the sensor (leave the cable secured to the crossarm). Remove the sensor from the crossarm assembly bushing.
- Page 8 N. Reinstall sensor according to installation procedure (Section 2.1); verify proper operation using procedures in Section 3.1 and 3.2. 020C Wind direction Sensor Maintenance (Refer to 020C drawing for assembly information) The following procedures require a relatively clean, dry work area, a source of 12 VDC power at approximately 20 mA, a Model 040 Degree Wheel, and a 4-1/2 digit or better digital voltmeter.
- Page 9 K. Remove 040 Degree Wheel and pointer. This completes the alignment procedure. Sensor Bearing Replacement (Refer to 020C Sensor Assembly drawing) A. Remove sensor from tower and remove vane assembly. Refer to Section 4.2. B. Disassemble sensor and remove old bearing. (#6)(Refer to Assembly Drawing) 1.
- Page 10 D. Recalibrate sensor in accordance with Section 4.3. E. Replace vane assembly and reinstall (refer to Section 2.1). Potentiometer Replacement (Refer to 020C Sensor Assembly drawing) A. Remove sensor from tower and vane assembly. Refer to Section 4.2. B. Disassemble sensor: 1.
- Page 11 2840 Circuit Board Assembly replacement. (Refer to 020C Assembly drawing) A. Remove sensor from tower and remove vane assembly (refer to Section 4.2). B. Slide the sensor cover down to expose the sensor interior. C. Remove two screws (14) holding circuit board assembly (15). Note color of wires.
- Page 12 Table 4-2 020C Replaceable Parts List ITEM # PART # DESCRIPTION 10296 Magnesium Vane Assembly, or 2755 Alum Vane Assembly 1009 Shield 1010 Slinger 1055 Bearing 2658 Hub/Shaft Assembly 720120 O-ring 805080 Resister 5W, 35: 480100 Cable Clamp 860050 Standoff...
- Page 13 020C-9800 REV A Page 12...
- Page 14 020C-9800 REV A Page 13...
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