Datasheet

Switchable optics for far-field measurements (75:1)
and close focus (1 mm, 70 mm distance)
Especially bright cross laser sighting for
indicating the actual measuring point
Reference accuracy ± 0.75 °C with super-
fast measurement technololgy (scanning 100
ms)
Backlit display (3-line) showing °C, min./max.
values, alarm limit values and degree of emission
Optical and audible alarm when limit values are
exceeded
Probe socket for TC probes for determining emissivity
Instrument memory for 90 measurement protocols
PC software for archiving and documenting measurement data
(included in delivery)
Tripod fitting for online measurement via USB cable (included in
delivery)
Measurement data documentation on site with testo report
printer
Aluminium case for instrument and accessories (included)
Probes see page 44/45
Additional information at
www.testo.com
www.testo.com
Non-contact measurements
43
testo 845
For the first time, surface
temperatures with smallest
diameters can be measured
accurately at short and long
distances. The switchable optics
for far-field and close focus
measurement make this possible.
Measurements in the far-field are
made with an optical resolution of
75:1. Surface temperatures can
thus be measured accurately
even at greater distances from the
object to be measured. At a
distance of 1.2 metres from the
object, the measurement point
diameter is only 16 mm. A cross
laser marks the measurement
point exactly.
For measurements at a small
distance from the object to be
measured, the close focus optics
provide a measurement point
diameter of only 1 mm at a
distance of 70 mm! Two laser
points mark the measurement
point.
Technical data
Meas. range -35 to +950 °C
Spectral range 8 to 14 µm
Accuracy
±1 digit
±2.5 °C (-35 to -20.1 °C)
±1.5 °C (-20 to +19.9 °C)
±0.75 °C (+20 to +99.9 °C)
±0.75% of mv (+100 to +950
°C)
Resolution
0.1 °C
Oper. temp. -20 to +50 °C
Storage temp. -40 to +70 °C
Battery life 25 h (without laser), 10 h
(with laser without light),
5 h (with laser and 50%
light)
Meas. spot marking Cross-laser in the far-field
2-point laser in close
focus
Dimensions 155 x 58 x 195 mm
Battery type 2 AA batteries
Technical data
Probe type Infrared
-35 to +950 °C
±0.75 °C (-35 to +75 °C)
±1% of mv (+75.1 to +950 °C)
0.1 °C
Type K (NiCr-Ni)
Weight
Warranty
Measurement rate
465 g
2 years
Emission factor Adjustable 0.1 to 1.0
Distance to
measurement spot
Far field: 75:1 16 mm
@ 1200 mm (90%)
Close focus: 1 mm @
70 mm (90%)
Material/Housing black/gray, metal screen
t95: 150 ms;
Scanning
Max/Min/Alarm: 100 ms
Zubehör
Accessories
Part no.
Humidity module, upgradeable for testo 845 0636 9784
Plug-in mains adapter, 5 VDC 500 mA with European adapter, 100-250 VAC,
50-60 Hz
0554 0447
External fast charger for 1-4 AA rech. batteries, incl. 4 Ni-MH rech. batteries
with individual cell charging and charge control display, incl. impulse trickle
charging, integrated discharge function, with built-in international mains
plug, 100-240 V, 300 mA, 50/60 Hz
0554 0610
Testo printer with wireless infrared interface, 1 roll of thermal paper and 4 AA
batteries, for printout of reading on site
0554 0547
Spare thermal paper for printer (6 rolls), measurement data documentation
legible for up to 10 years
0554 0568
testo saline pots for control and humidity adjustment of humidity probes, 11.3 %RH and 75.3
%RH with adapter for humidity probe, quick checks or calibration of humidity probe
0554 0660
Adhesive tape e.g. for reflective surfaces (roll, L.: 10 m, B.: 25 mm), E=0.95, E
= 0.95, temperature resistant up to +300°C
0554 0051
Silicone heat paste (14g), Tmax = +260°C, improves heat transfer in surface
probes
0554 0004
ISO calibration certificate/temperature, infrared thermometer;
calibration points +60°C; +120°C; +180°C
0520 0002
ISO calibration certificate/temperature, Infrared thermometers,
calibration points -18°C, 0°C, +60°C
0520 0401
Far-field measurement Close focus measurement
Part no.
0563 8450
testo 845, infrared temperature
measuring instrument with cross laser
marking and switchable optics for far-
field and close focus measurement,
incl. PC software with USB data
transfer cable, aluminium case, battery
and calibration protocol
Switch optics 2:
Close focus (1 mm,
distance 70 mm)
with 2-point laser
sighting
Switch optics 1:
Far-field 75:1 (16
mm, distance 1200
mm) with cross laser
sighting
Infrared Thermometer with Switchable Optics (far-field/close focus)
70 mm
Ø 1 mm
Ø 20 mm
Ø 20 mm
Ø 16 mm
Ø 40 mm
Ø 130 mm
Ø 279 mm
10000 mm
5000 mm
2000 mm
1200 mm
Switch to far-field measurement at a measurement distance > 250 mm.
43_098X_701X_PP_Temperature_845.qxd 29.10.2008 08:18 Seite 43