Met One 076B Radiation Shield Instruction Manual

June 10, 2024
Met One

Met One 076B Radiation Shield Instruction Manual

Met One 076B Radiation Shield Instruction Manual

www.metone.com
service@metone.com

Copyright Notice

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Technical Support

Should you require support, please consult your printed documentation or our website www.metone.com to resolve your problem. If you are still experiencing difficulty, you may contact a Technical Service representative during normal business hours;

Monday – Friday 7:00 a.m. to 4:00 p.m. Pacific Time.
Voice: 541-471-7111
Fax: 541-471-7116
E-Mail: service@metone.com
Mail: Technical Services Department
Met One Instruments, Inc.
1600 NW Washington Blvd
Grants Pass, OR 97526

DESCRIPTION

1.1 The Met One Instruments Power-Aspirated Radiation shield has a large primary tube for mounting up to four sensors. This tube is surrounded by two lightweight aluminum cylinder shields designed to thermally isolate the temperature sensors from the heating effects of the sun. For maximum reflection of solar radiation, all external surfaces are powder coated with a gloss white finish. To aid in the circulation of colling air around the outer shields, an AC powered fan is installed in the top of the aspirator shield. This fan requires little or no maintenance.
1.2 The 076B has an internal junction box that allows easy field connection and replacement 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.
1.3 A single sensor cable (2144) is used for all connections whether relative humidity, Delta temperature, ambient temperature or combinations of above.

Table 1-1

076B Radiation Shield Specifications

Met One 076B Radiation Shield - Table 1-1

*With two T-200 sensors, an 083 RH cannot be used

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 horizontal instrument mounting boom or support. The mounting arm may be a 191 or 193 crossarm, or any 3/4″ IPS pipe suitably mounted.
2.2 Slide the top hat onto the tower-mounting and tighten the two Allen screws on the top of the mount to lock the shield into place.
2.3 Refer to figure 2.1 for sensor installation, and figure 2.2 for standard sensor wiring. Appendix B details the wiring in the 2144 signal output cable. Verify the sensor model numbers before installation.
Note: If the Radiation Shield was ordered as part of a system, temperature and/or relative humidity sensors may have been installed at the factory. If this is part of a complete system, please refer to the custom wiring diagrams that were provided with your system as these may differ from the standard wiring shown in this manual.
2.4 Attach the Radiation Shield to the top hat in quick disconnect box with the radiation shield inlet facing down and tighten side clamps to fasten.
2.5 Connect AC and sensor cables and route to AC power source and translator or data logger respectively. Refer to figure 4.1 and Appendix A for power wiring connections.
2.6 Apply power and verify that aspirator motor is operating.
2.7 Check to see that sensor output is being recorded.

SENSOR INSTALLATION

Met One 076B Radiation Shield - Figure 2-1 Figure 2-1 Sensor Installation

STANDARD INTERNAL WIRING

Met One 076B Radiation Shield - Figure 2-2

Figure 2-2 Internal Sensor Wiring

TROUBLESHOOTING AND REPAIR

TABLE 3-1 Troubleshooting

Met One 076B Radiation Shield - TABLE 3-1
Troubleshooting

REPAIR INFORMATION

A. Electronic repair of the Motor Aspirated Radiation Shield is limited to replacement of the aspirator motor. If mechanical spare parts are worn or damaged, please refer to Figure 4-2 and Table 4-1 for a list of replacement parts.
B. Aspirator Motor Replacement
a. Remove all cables to the shield and remove the entire shield assembly from tower.
b. Separate shield from quick disconnect box.
c. Unsolder motor wires from receptacle. Note color and pin coding.
d. Remove top hat from shield.
e. Remove fan assembly.
f. Install new fan assembly and secure.
g. Solder motor wires to the proper pins as noted under “c”.
h. Temporarily connect power and verify fan operation.
i. Re-install fan housing assembly to the Radiation Shield.
j. Install assembly on tower and verify correct operation.

Met One 076B Radiation Shield - Figure 4-1

Figure 4-1 Internal Fan Wiring Diagram

REPLACEMENT PARTS LIST

Met One 076B Radiation Shield - Figure 4-2

Table 4-1 Replacement Parts List

Met One 076B Radiation Shield - Table 4-1 Replacement Parts
List

QUALITY ASSURANCE PROCEDURE

5.1 Purpose
To verify correct operation of Model 076B Motor Aspirated Radiation Shield
5.2 Activity
Confirm adequate flow through the radiation shield, and to check the general
condition of the motor aspirated shield. Clean shield for maximum reflectance.
5.3 Frequency
Every 6 months
5.4 Procedure
Place flow monitor, directly below radiation shield and confirm adequate flow.
5.4.1 Hold flow sensor at base of air inlet, position as shown.
5.4.2 With flow sensor in MPH range, the reading should indicate 5.0 or greater, record value. If flow is below that reading the flow system may be plugged or the motor is not operating properly.
5.4.3 Clean the top shields, and down tube with a damp rag, to remove any accumulation of dust and dirt. The white surfaces of the shield should be kept clean for maximum reflectance of solar radiation.
5.5 Skill level Required
A maintenance technician instructed in the operation of the flow monitor and disassembly of the 076B Shield.
5.6 Required Information
Record Flow
Record any damage to surface of shield, or down tube.

Met One 076B Radiation Shield - Figure 5-1

Figure 5-1 Flow Test of Shield

APPENDIX A

Power Cable (1954) Wiring Diagram

Met One 076B Radiation Shield - APPENDIX A

APPENDIX B

Signal Cable (2144) Wiring Diagram

Met One 076B Radiation Shield - APPENDIX B

Met One 076B Radiation Shield - APPENDIX B 2

APPENDIX C

Motor Aspirated Radiation Shield
Outline Dimensions

Met One 076B Radiation Shield - APPENDIX C

All Dimensions in Inches

References

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