Instrument Description; Keypad/Connection Assignment - TESTO 445 Instruction Manual

Keypad:
On/Off
Prints
Confirms menu
setting/
executes function
Saves
Return to current
measurement/
location
Arrow buttons
move the cursor
Hold Max Min
Mean

Instrument description

Keypad/Connection assignment

Connection assignment:
testo 445
Socket 1:
– Thermal velocity probes
(heated wire or ball)
– Vanes (inductive)
– Temperature probes
(Type K/J/S T/C or NTC)
– Differential pressure probes
(piezoresistive)
– Absolute pressure probes
(piezoresistive)
– CO
(2 beam infrared sensor)
– CO probe
Socket 2:
– Combined probe for humidity
(capacitive)
and temperature
(NTC or Ni 10000)
– 3-function probe for
humidity (capacitive),
temperature (NTC) and velocity
(ball)
RS232: PC connection
12V: Mains connection
testo 645
Socket 1:
– Temperature probes
(T/C type K/J/S or NTC)
Socket 2:
– Combined probe for humidity
(capactive)
and temperature
(NTC or Ni 10000)
– Temperature probes
(PT100)
RS232: Connection for PC
12V: Mains unit connection
6
RS232
2 1
12V
probe
2