testo 6621 - Maintaining the product
15
testo 6621-A
A02 (duct)
View of wiring side
Voltage output (4-wire,
0 - 1 V/0 - 5 V/0 - 10 V):
U = 20 - 30 VAC/DC
Current output (2-wire,
4 - 20 mA), max. load 500
Ω
2-wire/4-wire technology (1 analog output active for humidity,
1 passive temperature signal output)
testo 6621-A
A01 (wall)
View of wiring side (rear of housing)
Voltage output A01 (4-wire,
0...1V/0...5V/0...10V):
U = 20...30VDC/AC,
Temperature signal output
Ni1000 passive
testo 6621-A
A02 (duct)
View of wiring side
Voltage output (4-wire,
0...1V/0...5V/0...10V):
U = 20...30VAC/DC,
Temperature signal output
Ni1000 passive
Current output (2-wire,
4...20mA), max. load 500
Ω,
Temperature signal output
Ni1000 passive
6
5
4
3
2
1
+
-
+
-
+
-
T
rH
U
6
5
4
3
+
-
T
+
-
U
+
-
U
➋
+
-
rH
1
2
3
4
5
6
+
-
+
-
+
-
U
rH
T
6
5
4
3
2
1
+
-
+
-
+
-
T
rH
U
6
5
4
3
+
-
+
-
rH
T
+
-
U
+
-
U
de
fr
es
it
pt
sv
nl
??
??
Содержание 6621
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