TESTO 845 - Technical Specifications

2311. Technical data
11. Technical data
Description testo 845
Measurement parameter Temperature (°C / °F)
Measurement value recorder Infrared sensor
Measuring range • IR °C -35°C to +950°C
• Humidity module 0 to 100%RH
0 to +50°C
-20 to +50°C td
• Contact °C -35 to +950 °C
Resolution 0.1°C (°C measurement parameters)
0.1%RH (humidity)
0.1°C td (dewpoint)
Accuracy IR (at 23°C) +/- 1 digit +/- 2.5°C (-35 to -20.1°C)
+/-1.5°C (-20 to +19.9°C)
+/-0.75°C (+20.0 to +99.9°C)
+/-0.75% of m.v.(+100 to +950°C)
Accuracy °C contact (Type K) +/- 1 digit +/- 0.75°C (-35 to +75°C)
+/-1 % of m.v. (+75.1 to +950°C)
Accuracy humidity module +/- 1 digit +/- 2% RH (2 to 98% RH)
+/-0.5 °C (+10 to +40°C)
+/-1.0 °C (remaining range)
Emission factor adjustable 0.1 to 1.0
Wavelength 8 to14 µm
Switchable distance ratio Far field: 75:1 (16mm, distance 1200mm)
Close focus: 1mm, distance 70mm
Probe integrated infrared
Measurement rate t95: 150 ms
Scanning max./min./Alarm: 100 ms
Application temperature -20°C to +50°C
Storage temperature -40°C to +70°C
Battery type 2 x AA AlMn
Battery life 25 h (without laser)
10 h (with laser without backlight)
5 h (with laser and 50% backlight)
Battery exchange by user
Housing ABS (black, grey), metal cover
Display three-line with backlight
Dimensions testo 845 in mm (LBH) 155 x 58 x 195
Dimensions case in mm (LBH) 405 x 340 x 93
Weight testo 845 without humidity module 455 g
Weight testo 845 with humidity module 465 g
Weight instrument and case 2700 g
EU guideline 2004/108/EEC
Sensitivity IR measurement: ± 2°C (± 3.6°F) for 640 MHz to 680 MHz in 2.5 V/m field.
(+20.0...+99,9°C)
Interference: trade-typical limit according to EN 61326-1