TESTO 6621 - Parameterizing;adjusting;analyzing the instrument

testo 6621 - Tips and assistance16
3-conductor technology (2 analog outputs active)
All earth connections are connected to each other (= one common earth).
Attention! Incorrect polarity wil destroy the instrument (instrument not reverse
polarity-proof).
 Connections for voltage supply: connect common earht to pin 2!
testo 6621-AA01 (Wall)
View of wiring side (rear of housing)
testo 6621-AA02 (Duct)
View of wiring side
1
23
4
5
6
+
-
+
-
+
-
U
rH T
~
24V~
123456
+-+
-
+-
UrHT
-
+