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Technical data - Instruments
testo 645/445
Memory space: Up to 3000 readings
Power supply: Battery / rechargeable batt.
Alternative: 12 V mains unit
Battery recharging in instr.
Typical Temperature/humidity
battery probes, pressure probes,
lifetimes: vane probes:
30 to 45 h
Thermal probes,
CO2 probes, 3-function
probe:
>3 - 12 h
Reduce the hour times by
a factor of 5 if a 9V battery
is used.
Operating
temperature: 0 to +50 °C
Storage
temperature: -20 to +70 °C
Weight: Approx. 255 g incl. batteries
Other features - Automatic recognition of
all connected probes
- RS232 interface for
data management
(electrically isolated)
Type K (NiCr-Ni)
Measuring range: -200 to +1370 °C
Accuracy* ±0.3 °C or ±0.5 % of
at 22 °C: reading
(the larger value applies)
Additional error over
operating
temperature range: ±0.2 °C
Resolution: 0.1 °C
Temperature: -20 to +180 °C
Measuring range: 0 to 100 %RH
Resolution: 0.1 %RH
System Up to 1.0 %RH
accuracy*: (see probe data)
Calc. humidity td, g/m
3
, g/kg, J/g
parameters: (pressure-compensated)
Type J (FeCu-Ni)
Measuring range: -200 to +1000 °C
Accuracy* ±0.3 °C or ±0.5 % of
at 22 °C: reading
(the larger value applies)
Additional error
over operating
temperature range: ±0.2 °C
Resolution: 0.1 °C
NTC
Measuring range: -50 to +150 °C
Accuracy*: ±0.2 °C (-25 to +74.9 °C)
±0.4 °C (-50 to -25.1 °C/
+75 to +99.9 °C)
±0.5 % of reading
(+100 to +150 °C)
Resolution: 0.1 °C
The following can also be connected:
thermocouple: Type S (Pt Rh-Pt)
testo 645/445
General technical data
Humidity measurement
Temperature measurement
Instruments 2 years
Probes 1 year
Terms of warranty: see website
www.testo.com/warranty
Warranty
1.888.610.7664 info@Testo-Direct.com
www.Testo-Direct.com
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