Met One Instruments 076B Manuale utente

MODEL 076B

RADIATION SHIELD

OPERATION MANUAL

Met One Instruments, Inc

Corporate Sales & Service: 1600 NW Washington Blvd. Grants Pass, OR 97526

Tel (541) 471-7111 Fax (541) 471-7116

www.metone.com - service@metone.com

076B-9800 Rev B Page 1

076B RADIATION SHIELD

OPERATION MANUAL

1.0 GENERAL INFORMATION

1.1 The Met One Instruments Power-Aspirated Radiation shield consists of a large

primary tube for mounting up to four Model 061 or T-200 sensors; two lightweight

aluminum cylinder shields, painted with a gloss enamel on the outer surfaces for

maximum reflection, and an aspirator motor with fan that requires little or no

maintenance. The Model 061 Ambient Temperature, T-200 Ambient / Delta

Temperature, 083E or 085 Relative Humidity sensors are generally used with shield.

1.2 The 076B has an internal junction box that allows easy field connection of sensors

without requiring soldering or potting. The internal junction box minimizes the

problems that are associated with the dirt/moisture/resistance paths between the

connections on exposed connectors. The 076B will allow the customer to replace

sensors easily in the field without re-soldering and re-potting.

1.3 A single sensor cable (2144) is used for all connections whether relative humidity,

dew point, Delta temperature, ambient temperature or combinations of above. Refer

to drawing 076B-1.

Table 1-1

076B Radiation Shield Specifications

Radiation Error Less than 0.05 under maximum solar

radiation of 1.6 gm-cal/cm2/min

Power Requirement 115 V 60 Hz @ 1 amp or less

220 V Optional

Temperature -50C to +85C

Weight 5.5 pounds

Sensor Capacity Sensors Mounted

Shield Model 061/T-200 083D

076B-1 1 to 4 1

076B-2 1 to 4 1

076B-9800 Rev B Page 2

2.0 INSTALLATION

CAUTION:

To prevent damage to the sensor do not apply pressure or load to the aspirator

tube during removal from the shipping tube or carton.

2.1 The Radiation Shield is designed to slide onto a horizontally mounted instrument

mounting arm. The mounting arm may be the 5307 mounting arm kit or other ¾ inch

I.P.S. pipe suitably mounted.

2.2 Slide the top hat onto the tower mounting arm tighten the four Allen Screws to lock

into place.

2.3 Attach the Radiation Shield to the top hat in quick disconnect box with the radiation

shield inlet facing down and tighten side clamp to fasten.

2.4 Connect AC and sensor cables and route to AC power source and translator

respectively. Refer to 076B-1 wiring connections.

2.5 Apply power and verify that aspirator motor is operating.

2.6 Check to see that sensor output is being recorded.

3.0 MAINTANCE AND TROUBLE SHOOTING

Table 3-1

076B Troubleshooting Table

Symptom Probable Cause Solution

Fan does not operate Loss of AC power Check AC source

Check all cables

Motor failure Replace fan

076B-9800 Rev B Page 3

3.1 Repair Information

A. Repair of the Power Aspirated Radiation Shield is limited to replacement of the

aspirator motor.

B. Aspirator Motor Replacement

1. Remove all cables to shield and remove entire shield assembly from

tower.

2. Separate shield from quick disconnect box.

3. Unsolder motor wires from receptacle. Note color and pin coding.

4. Remove top hat from shield.

5. Remove fan assembly.

6. Install new fan assembly and secure.

7. Solder motor wires to the proper pins as noted under “C”.

8. Temporarily connect power and verify fan operation.

9. Re-install fan housing assembly to the Radiation Shield.

10. Install assembly on tower and verify correct operation.

Table 2-2

Replaceable Parts List

Motor (120 VAC) 590050

Motor (220 VAC) 590051

076B-9800 Rev B Page 4

076B-9800 Rev B Page 5

076B-9800 Rev B Page 6

076B-9800 Rev B Page 7

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