Description

“The testo 645 high-precision humidity and temperature measuring instrument offers two probe inputs for attaching a comprehensive range of probes:
Channel 1: temperature probe, type K/J/S, NTC
Channel 2: humidity/temperature probe or Pt 100 temperature probe
At the touch of a button, the thermohygrometer automatically indicates the measurement parameters of temperature, relative humidity, dew point, pressure dew point, absolute humidity, degree of humidity and enthalpy, along with min., max. and mean values, as well as the last measured value. Convenient evaluation of the measurement data is possible using the optional PC software.
Measurement data can also be printed out directly at the measuring location via the optional testo fast printer. Areas of application of the testo 645 humidity/temperature measuring instrument
Monitoring of temperature and humidity values in production, storage and server rooms, museums, archives, cold stores, containers and display cases
Location of mould formation in residential or other buildings ”

USPs

• High-precision humidity measurement up to ± 1% RH
• Internal reading memory (3,000 readings)
• High-precision humidity measurement up to ± 1% RH
• Possibility of attaching a really wide range of optional probes thanks to a large accessory portfolio

Delivery Scope

testo 645 humidity/temperature measuring instrument, including battery.

Downloads

Download DataSheet Instruction Manual

Application Image

Technical Details

Temperature – Pt100
Measuring range -200 to +800 °C
Accuracy ±0.1 % of mv (200.1 to 800 °C), ±0.2 °C (-200 to 200 °C)
Resolution 0.1 °C

Temperature – NTC
Measuring range -50 to +150 °C
Resolution 0.1 °C

Temperature – TC Type K (NiCr-Ni)
Measuring range -200 to +1370 °C
Accuracy ±0.5 % of mv (-200 to -60.1 °C), ±0.5 % of mv (+60.1 to +1370 °C), ±0.3 °C (-60 to +60 °C)
Resolution 0.1 °C

Temperature – TC Type J (Fe-CuNi)
Measuring range -40 to +750 °C
Accuracy ±0.5 % of mv (-200 to -60.1 °C), ±0.5 % of mv (+60.1 to +750 °C), ±0.3 °C (-60 to +60 °C)
Resolution 0.1 °C

Temperature – TC Type S (Pt10Rh-Pt)
Measuring range -50 to +1700 °C

Humidity – Capacitive
Measuring range 0 to 100 %RH
Accuracy
see probe data
Resolution 0.1 %RH (-50 to +150 °C)

General technical data
Dimensions 215 x 68 x 47 mm
Operating temperature 0 to +50 °C
Product-/housing material ABS
Number of channels 2-channel
Battery type 9V block battery
Battery life 45 h
Battery feature The hour times are reduced by a factor of 5 if a 9V rech. battery is used
Display type LCD
Display size 4 lines
Storage temperature -20 to +70 °C
Weight 255 g