http://ocotal.iarc.uaf.edu/index.php?action=history&feed=atom&title=Super_Site_HMP155_Sensor_SwapSuper Site HMP155 Sensor Swap - Revision history2026-04-19T18:24:51ZRevision history for this page on the wikiMediaWiki 1.34.2http://ocotal.iarc.uaf.edu/index.php?title=Super_Site_HMP155_Sensor_Swap&diff=4197&oldid=prevBob: Created page with " ==Tools== * 5/16" Nut Driver * camera / cellphone camera * optional: something to keep the loose parts from flying off the tower ==Process in field== * The HMP155 air temper..."2022-07-17T05:31:40Z<p>Created page with " ==Tools== * 5/16" Nut Driver * camera / cellphone camera * optional: something to keep the loose parts from flying off the tower ==Process in field== * The HMP155 air temper..."</p>
<p><b>New page</b></p><div><br />
==Tools==<br />
* 5/16" Nut Driver<br />
* camera / cellphone camera<br />
* optional: something to keep the loose parts from flying off the tower<br />
<br />
==Process in field==<br />
* The HMP155 air temperature / relative humidity sensor is in what is called an aspirated radiation shield. The aspirator is a blowing fan that brings ambient air over the sensor head. They are secured to the North East leg of the platform tower at a variety of heights.<br />
* There is a pvc 90* angle. Carefully loose it.<br />
* Once the angle is off, the cable side of the sensor will be exposed. <br />
* Take a photo of the old one's serial number as well as the marked height.<br />
* Unscrew the data cable and secure it so it doesn't fall to a lower level.<br />
* Carefully remove and watch that the insulation inside the fan tubing doesn't blow out and onto the ground below.<br />
* Take a photo of the serial number for the replacement sensor.<br />
* Place the sensor into the fan tubing and reconnect the data cable.<br />
* reinstall the elbow.<br />
* Done.<br />
==Process out of field==<br />
* Submit PR for either Vaisala or Campbell Scientific for an instrument recalibration and include a guess on cost of shipping.<br />
* Contact company for RMA number, fill out online declarations and ship.<br />
** Vaisala has an online store where instrument info can be uploaded.<br />
** Campbell Scientific requires an email to their support to request an RMA.<br />
* If I think a sensor is broken I send it to Vaisala or if it just needs recalibrating I send to Campbell Scientific. Vaisala will often replace at reduced cost broken instruments. Campbell Scientific has a cheaper recalibration price for working sensors.<br />
* Box up and send via UPS with RMA info on outside of box.</div>Bob