Super Site CNR4 Recalibration procedure

Pictures to take

Instrument
flipped
sensor cables ends
Also:
- I photograph the old & new calibration stickers on the bottom of the CNR4s. If you do this with a bit of visible background (numbers need to be legible but the background can be blurry) it's clear which instrument is mounted on the tower vs the forest floor.

Copy down the calibration coefficients from the new unit and modify the current program to reflect these values.
- The coefficients are on a label stuck to the underside of the CNR4.
The data logger these instruments are wired to is SS_Met
Current program is ____
I typically do a file -> save as and update the date in the file name each time I change coefficient values (or try to!)

bring the tools to the top of the tower
bring the replacement instrument to the top of the tower
use the 1/2" box wrench & 1/2" nut driver to loosen the ubolts holding the cross arm in place.
use the 5/16" nut driver to loose the hose clamp (loosen but do not remove)
carefully wiggle / bump / shimmy the cross arm back to the platform.
once the cabling is very close carefully unscrew the CNR4 from the slender cross arm.
move the sensor to the tower platform
use one of the phillips screwdrivers to remove the plastic radiation shield.
use one of the phillips screwdrivers to remove the machine screws securing the CNR4 to the heater/fan part
once the pieces are separated, use the small channel lock pliers to unscrew the sensor cables.
- Note that there are three cables. The outside the case one is for the fan/heater. (four pins I believe)
- The other two are for the net radiometer. I believe the one on the left is for the radiation and has eight pins. The one on the right has less pins and is used to measure the internal temperature of the radiometer.
The old unit can be set aside and you can reverse these steps to deploy the freshly calibrated one (or at least the one which has not yet been placed in the field, it probably has been sitting on the shelf for a year or two after recalibration)

bring tools and set on ground.
twist the sensor one-half turn so it is upside down. (counter clock-wise)
use one of the phillips screwdrivers to remove the plastic radiation shield.
use one of the phillips screwdrivers to remove the machine screws securing the CNR4 to the heater/fan part
once the pieces are separated, use the small channel lock pliers to unscrew the sensor cables.
- Note that there are three cables. The outside the case one is for the fan/heater. (four pins I believe)
- The other two are for the net radiometer. I believe the one on the left is for the radiation and has eight pins. The one on the right has less pins and is used to measure the internal temperature of the radiometer.
The old unit can be set aside and you can reverse these steps to deploy the freshly calibrated one (or at least the one which has not yet been placed in the field, it probably has been sitting on the shelf for a year or two after recalibration)