Extech instruments 421508 User Manual
INSTRUCTION MANUAL
Model 421508
Dual Input, 3-Display Handheld Thermometer
• Accepts J, K, T, E, R, S, & N thermocouples
• Backlit Electro-luminescent LCD Display
• T1 / T2 / T1 – T2 displays
• MIN / MAX / AVG Record/Recall
• Selectable temperature units (C/F)
• Data Hold, Relative Mode, Elapsed Timer
• Bi-directional RS-232 PC Interface
Introduction
Congratulations on your purchase of Extech’s Dual Input, 3-Display, Hand-Held Digital
Thermometer. This portable digital thermometer is designed to use external K / J / T / E / R
/ S / N type thermocouples (K-type supplied). Temperature indication follows Reference
Temperature/Voltage Tables (N.I.S.T. Monograph 175 Revised to ITS-90). This
professional meter, with proper care, will provide years of safe reliable service.
Page 1 Model 421508 Version 1.0 October 2002
Specifications
General Specifications
Display 5-digit (9999.9), 3-Display, LCD with EL Backlighting
Water resistant housing Gasket protected front panel
Input Protection 24VDC or 24VAC rms maximum input on any combination of
inputs. Max voltage between T1 and T2 inputs is 1V
Reading rate One reading per second
Input connectors Accepts standard sub-miniature thermocouple connectors
Operating conditions 32 to 122oF (0 to 50oC); less than 80% RH
Storage conditions -4 to 140oF (-20 to 60oC); less than 70% RH
Dimensions / Weight 7.5 x 3.6 x 2.1” (192 x 91 x 52.5mm); 11.7oz. (365g)
Power Supply 9V battery
Auto Power off Meter automatically turns off after 30 minutes of inactivity
Battery life 100 hours typical
Range Specifications
Thermocouple Range Resolution
K type -328 to 2501oF (-200 to 1372oC) 0.1oF (0.1oC) from 0 to 700oF,
J type -346 to 1922oF (-210 to 1050oC) 0.1oF (0.1oC) from 0 to 500oF,
T type -328 to 752oF (-200 to 400oC) 0.1oF (0.1oC) from 0 to 600oF,
E type -346 to 1454oF (-210 to 790oC) 0.1oF (0.1oC) from 0 to 450oF,
o
F all other ranges
0.2
o
F all other ranges
0.2
o
F all other ranges
0.2
o
F all other ranges
0.2
R type 32 to 3212oF (0 to 1767oC) 1oF (1oC)
S type 32 to 3212oF (0 to 1767oC) 1oF (1oC)
N type -58 to 2372oF (-50 to 1300oC) 0.2oF (0.1oC)
Accuracy Specifications
Thermocouple Accuracy
K, J, T, E types ±(0.05% rdg + 0.6oF) -58oF to 2498oF
±(0.05% rdg + 1.4
±(0.05% rdg + 0.3
±(0.05% rdg + 0.7
N type ±(0.05% rdg + 1.4oF) -58oF to 32oF
±(0.05% rdg + 0.6
±(0.05% rdg + 0.7
±(0.05% rdg + 0.3
R, S types ±(0.05% rdg + 0.6oF) -58oF to 2498oF
±(0.05% rdg + 1.4
±(0.05% rdg + 0.3
±(0.05% rdg + 0.7
Temperature
Coefficient
Supplied
Thermocouples
0.1 multiplied by the accuracy per oC from 0oC to 18oC and 28oC to
o
C (32oF to 64oF and 82oF to 122oF)
50
4', type K (with teflon insulation) Max insulation temp: 500oF (260oC)
Accuracy: ± 4
32 to 1472
o
F) -58oF to 346oF
o
C) -50oC to 1370oC
o
C) -50oF to -210oC
o
F) 32oF to 2372oF
o
C) -50oC to 0oC
o
C) 0oF to 1300oC
o
F) -58oF to 346oF
o
C) -50oC to 1370oC
o
C) -50oF to -210oC
o
F (2.2oC) or ± 0.75% of rdg (whichever is greater) from
o
F (0 to 800oC)
Page 2 Model 421508 Version 1.0 October 2002
Loading...