Equipment and Calibration

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Equipment Entry

Instrument:RH & Temp
Manufacture:Vaisala
Model No:HMP45A
Serial No:U2120013
Tag No:
Acquisition Date:0000-00-00
Project:
Location on 2022-01-19:Lab,
Notes:

Documents

No documents found

Report: HMP RH and AirT Comparison 12-2017 - 2017-12-18

History

Rec No.DateLoc FromTitleLoc ToNotes
5662 2022-01-19 Lab none Tested Lab none Ran for a week on the lab bench next to an HMP155; both sensors were aspirated with a plug-in fan. I didn't see any drifting over the week, but still, probably don't want to use this sensor except as a last resort.
5588 2021-11-23 Mayberry RH & Temp Removed Lab none Removed from MB and brought back to the lab for testing. AirT has been drifting downward since late October.It was replaced by HMP155 sn T2820180.
5674 2019-10-22 Mayberry RH & Temp Repair Mayberry RH & Temp Removed screw terminal that was currently fixing a broken wire and fixed the break with solder, heat shrink, and liquid electrical tape.
3847 2019-01-24 Mayberry RH & Temp Serviced Mayberry RH & Temp Short in the 12V wire at the splice point. Repaired in the field with a screw terminal, but should be brought back to the lab for a full repair.
3259 2017-12-19 Twitchell Alfalfa 0 Removed Mayberry RH & Temp Removed from the HMP inter-comparison at Twitchell Alfalfa and returned to Mayberry
3242 2017-12-18 Mayberry RH & Temp Removed Twitchell Alfalfa 0 Removed from Mayberry for 24hour side-by-side comparison at Twitchell Alfalfa
554 2012-04-24 Mayberry RH & Temp Rewired Mayberry RH & Temp Output removed from CR1000 and swapped over to new LI-7700 sn TG1-0224 analog inputs
456 2011-11-22 Lab none Installed Mayberry RH & Temp Installed on the Mayberry tower to replace sn U3030041. This HMP45 has a lengthened cable to allow mounting with the recently raised eddy sensors.
457 2011-11-21 Siyan Maintenance Lab none I lengthened the cable on this sensor. New wire colors are: ??
378 2011-06-18 Lab none Loaned Siyan Loaned to Siyan for her work at Teakettle Forest.
291 2011-02-03 Tonzi-Floor Removed Lab none Removed from under the trees near the floor tower.
292 2010-03-16 Lab none Installed Tonzi-Floor Installed under the trees near the floor tower.
30 2009-12-21 Lab none Tested Lab none Tested on a CR1000 against an HMP45AC (sn U3030041) freshly returned from Vaisala factory calibration. See file HMP45A_CalCheck.xls. The comparison was for a very small range of temperatures ove a short time but;

Air Temperature: y = 0.7425x + 4.8166 R2 = 0.9972
Relative Humidity: y = 0.99x - 1.4165 R2 = 0.9986
29 1999-08-18 Factory Calibration Lab none Factory calibrated by Vaisala