TESTO 6621 - Page 15

testo 6621 - Maintaining the product 15
testo 6621-AA02 (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-AA01 (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-AA02 (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 500Ω,
Temperature signal output
Ni1000 passive
654321
+-+-+-
T
rH
U
6543
+-
T
+
-
U
+
-
U
➋
+-
rH
123456
+-+-+-
UrH
T
654321
+-+-+-
T
rH
U
6543
+
-+-
rH T
+
-
U
+
-
U
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