MTP 5-HE (Extended range) was developed for locations where the urban / industrial area lies in a valley or close to mountains and inversions up to 1000 m can cause problems.

In order to measure to 1000 m a more sensitive and narrower bandwidth design of receiver is used and the frequency is slightly shifted to ‘see’ further in the atmosphere.

Typically, temperature inversions that cause bad air quality events occur well below 600m, if they are higher than this there is not normally a problem. However, in a valley or close to mountains, higher inversions can trap pollutants over the urban or industrial area.

MTP 5-HE is the ‘extended range’ version of the MTP-5H and has similar design and features. However, it measures up to 1000 m by using a more sensitive and narrower bandwidth design of receiver with the frequency slightly shifted to ‘see’ further into the atmosphere. A consequence of this is that the altitude and temperature accuracies are not quite as good as the MTP-5H and there is some further reduction of accuracy in heavy rain or fog.

Main characteristics

Altitude range	0 to 1000 m
Displayed height interval	25-50 m
Altitude accuracy	25 %
Minimum measurement interval	180 s
Temperature accuracy, RMS	0.2o to 1.2o or better
Receiver sensitivity	0.07o
Power requirements MTP-5	12 VDC / 120 W
Operating temperature range	-40o to +50o

Dimensions

Example of comparing with RASS and a sonde