Specifications - Extech Instruments 42535 User Manual

Infrared Measurement Considerations
1. The 42535 automatically compensates for ambient temperature deviations, however it
may take up to 30 minutes to adjust to extremely wide ambient temperature changes.
2. When low temperature measurements are taken followed by high temperature
measurements, several minutes are required for stabilization before the high
temperature measurements can be made accurately.
3. Measurement Field / Distance: The object under test should be larger than the spot size
shown in the above diagram. For optimum accuracy, the object should be 1.5 to 2 times
larger.
4. Measurement Interference: Objects having low emissivity or objects with low
temperature yet high emissivity emit little IR energy. Such objects are adversely affected
by IR energy radiated from nearby objects having high emissivity and temperature. For
example, when such objects are measured in sunlight, erratic readings occur because of
the powerful radiation (sunlight) reflected off of the object's surface into the 42535
sensor.
5. If an object's surface is highly reflective, apply masking tape or flat black paint before
measuring.

Specifications

Display
Sample rate
Laser power
Operating Temperature
Operating Humidity
Power Supply
Battery Life
Weight
Size
Infrared Thermometer Specifications
Range / Resolution
Accuracy
Accuracy notes
Emissivity settings
Distance to spot ratio
Wavelength
Type K Thermocouple Specifications
Range / Resolution
Accuracy
Accuracy note
Sensor type
EMC/RFI
Readings may be affected if the unit is operated within radio frequency electromagnetic
field strength of approximately 3 volts per meter, but the performance of the instrument
will not be permanently affected.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
0.31" (7.87mm) 4-digit LCD display
1 sec. approx.
Laser power less than 1mW (red), 645-660nm
32°F to 122°F (0°C to 50°C)
Max. 80% RH.
2 AAA batteries
180 hrs typical (without Laser and Back Light)
6.3oz / 179g
6.9 x 1.5 x 2.8" (175 x 39 x 72 mm)
o
-76 to 932 F (-60 to 500
o
± 2% of reading or ± 4 F (2
1. Accuracy specified for ambient temperature
2. Accuracy specified for emissivity of 0.95
0.95 default value (0.1 to 1.00 adjustable)
D/S = Approx. 11:1 ratio (D = distance, S = spot)
8 to 14 µm
o
-83 to 1999 F (-64 to 1400
± (1% reading) or ±1.8°F/1°C (whichever is greater)
Stated accuracy does not include thermocouple probe
accuracy
Type K (NiCr – NiAl) Thermocouple (sold separately)
4
o o
C) 0.1 C/F
o
C) whichever is greater
o o
C) 0.1 C/F
42535 Version 4.0 01/05