Campbell Met One 034A-L Manual do Operador descarregar pdf (Página 43)

Manual

Protective Enclosure ENC12/14

6.1 General

The fiberglass-reinforced polyester enclosure ENC12/14 serves as housing for datalogger and power unit. It is made

of non-corrosive UV-stabilized material, with a white color to reflect solar radiation, hence reducing inside tempera-

ture and eliminating the need for a separate radiation shield. The ENC12/14 provides protection against water, dust

and most environmental pollutants. It can be locked with a padlock to prevent non-authorized persons to access the

inside equipment.

6.2 Installation

Attach the ENC12/14 firmly to the tripod’s upper body using the provided clamps. Tighten the nuts securely.

Mount the datalogger and power unit to the back plate using the supplied plastic grommets and screws, as indi-

cated in figure 6 in paragraphs 2.2. Route all sensor and solar panel wires through the enclosure conduit to the wir-

ing panel of the datalogger. The user is referred to paragraph 2.2 and Annex 2 for instructions for proper wiring.

After wiring, attach the cables in an orderly manner to the side of the ENC12/14 using the provided cable ties and

cable tabs.

Attach a humidity indicator on the inside of the protective enclosure.

Seal the gap between the sensor leads and the enclosure conduit with the provided sealing putty. However, make

sure a tiny opening remains to vent possible hydrogen gas generated by the lead acid rechargeable battery.

To remove excess water vapor, place two packages of desiccant (4 units) in the enclosure.

6.3 Maintenance

Maintenance of the ENC12/14 is limited. During every visit to the Met Station, check if the enclosure is firmly

attached to the tripod. If necessary fasten securely.

If the 40% ring in on the humidity indicator starts to turn pink, replace the two desiccant packs. At the same occa-

sion, also change the humidity indicator.

During every visit, check if all cables are firmly connected to the wiring panel. If necessary fix securely.

During every visit, check if the grounding cable is firmly connected to the ground terminal of the ENC12/14. If

necessary fasten firmly.

Remove any alien material from the enclosure. Make sure the conduit is almost closed. However, make sure the

opening is not completely clogged to facilitate exit of possible hydrogen gas from the rechargeable battery.

6.4 Trouble Shooting

Problem 1: The desiccant pack is due to be replaced but they are out of stock.

Remedy 1.1: Keep an inventory of all consumables and timely order the items which stock is running low. Inquire

at your contact person at Campbell Scientific on how to order new desiccants packs.

Remedy 1.2: Desiccant packs can be recovered by heating in an oven (or alternatively in a frying pan with cover)

for 2 hours at 50º C. Make sure the temperature does not exceed 50º C as the paper bags might catch fire at higher

temperatures and/or the chemical constitution of the desiccant may change.

It is not advised to subject a desiccant pack several times to this procedure as the drying power may diminish in

the dehumidification process.

Protective Enclosure ENC12/14

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Campbell Met One 034A-L Manual do Operador Página 43