Extech 421509 Operating Manual
User’s Guide
Dual Input, 3-Display Thermometer/Datalogger
Model 421509
• Accepts J, K, T, E, R, S, & N thermocouples
• Internal Memory stores up to 16 data sets,
with 1024 maximum data capacity
• 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
APO
¡FT1
K
ESC - 0
123
SAVE
READ
456
REL
HOLD
789
TYPE
T1/T2
SECOND
MAIN
DISPLAY
¡C/¡F
[Limits]
LOG
READ
[APO]
MAX/MIN
TYPE
T1/T2
T1
¡FT1-T2
421509
ENTER
[INVT]
CLR ?
SET[ ]
SHIFT
[OFS]
[TIME]
T1-T2
THIRD
Introduction
Congratulations on your purchase of Extech’s Dual Input, 3-Display, Hand-Held Digital
Thermometer/Datalogger. 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). It
features an adjustable T/C offset and an RS-232 interface for uploading data to a PC using
optional software and cable. This professional meter, with proper care, will provide years of
safe reliable service.
Specifications
General Specifications
4-1/2 digit (19,999), 3-Display, LCD with EL Backlighting
Display
Input Protection 24VDC or 24VAC rms maximum input on any combination of
inputs. Max voltage between T1 and T2 inputs is 1V
Reading rate 2.5 times per second
Input connectors Accepts standard sub-miniature thermocouple connectors
Alarm Output 6-pin mini DIN, max. 5mA@5 to 30VDC (external source)
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 or optional AC Adaptor
Auto Power off User programmable from 5 to 19999 minutes
Battery life 100 hours typical
Range Specifications
Thermocouple Range Resolution
K type -328 to 2501oF (-200 to 1372oC) 0.1oF (0.1oC),
J type -346 to 2192oF (-210 to 1200oC) 0.1oF (0.1oC),
o
1
F > 2000°
o
1
F > 2000°
T type -328 to 752oF (-200 to 400oC) 0.1oF (0.1oC)
E type -346 to 1832oF (-210 to 1000oC) 0.1oF (0.1oC)
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) 0.1oF (0.1oC)
Accuracy Specifications
Thermocouple Accuracy
K, J, T, E types ±(0.05% rdg + 0.6oF) -58oF to 2501oF
±(0.05% rdg + 1.4
±(0.05% rdg + 0.3
±(0.05% rdg + 0.7
N type ±(0.05% rdg + 1.6oF) -58oF to 32oF
±(0.05% rdg + 0.8
±(0.05% rdg + 0.8
±(0.05% rdg + 0.4
R, S types ±(0.05% rdg + 4.0oF) 32oF to 3212oF
±(0.05% rdg + 2.0
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
from 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
C) 0oC to 1767oC
o
F (±2.2oC) or ± 0.75% of rdg (whichever is greater)
o
F (0 to 800oC)
2
421509 Version 2.0 10/07
Safety Information
Please read the safety and operational instructions before using this device.
WARNING
To avoid electrical shock, do not use this instrument when working near voltages over 24V
AC/DC.
WARNING
To avoid damage or burns, do not make temperature measurement in microwave ovens.
CAUTION
Repeated flexing can break the thermocouple leads. To prolong lead life, avoid sharp
bends in the leads, especially near the connector.
This symbol on the instrument indicates that the operator must refer to an
!
explanation in this manual.
Meter Description
1. Optical RS-232 Interface
1
2
3
9
2. Thermocouple inputs
3. Mini DIN I/O port
4. Triple LCD Display
5. Keypad Overlay
6. Keypad
7. Protective rubber holster
8. Battery compartment on rear
9. 12VDC Adaptor input
0 ENTER
¡C/¡F
[Limits]
LOG
READ
[APO]
MAX/MIN
TYPE
T1/T2
SECOND
DISPLAY
421509
T1
¡FT1-T2
[INVT]
CLR ?
SET[ ]
SHIFT
[OFS]
[TIME]
T1-T2
THIRD
APO
4
5
6
¡FT1
K
ESC -
123
SAVE
READ
456
REL
HOLD
789
TYPE
T1/T2
MAIN
7
8
3
421509 Version 2.0 10/07
Operation
There are three operation modes—Normal, Shift, and Setup mode
Normal Mode
This is the default mode. The operating functions for normal mode are printed on the face
of each button in white. The following functions can only be used in Normal Mode.
Power Button
The Power key turns the thermometer ON or OFF. When entering data in Setup Mode, the
power off function is disabled.
[Limits] Button
The Limits function will alert the user when a measurement exceeds a specified limit. To
set the limit values, refer to the limits function in the Setup Mode. Press the [Limits] button
to activate the Limits function ("LIMIT" will be displayed on the LCD). When the measured
temperature on the main display is higher than the High Limit (or lower than the Low Limit),
the alarm beeper emits a tone and "Hi" “or “Lo” is displayed. Note: The tones for High and
Low Alarms are different; the High Alarm tone is pulsed while the Low Alarm tone is
continuous. Note: When reading over 2000°F using a K or J thermocouple, the reading
should be multiplied by 10. (example: 2100°F x 10 = 21000). To exit the Limits function,
press the [Limits] button. In this mode, the automatic power-off feature is disabled along
with the following keys: REL, HOLD, & MIN MAX.
Backlight Button
Press the backlight button to toggle the backlighting on and off. The backlight will switch-off
automatically after 60 seconds to conserve battery life.
SAVE/READ Button
The Read data function is used for reading saved data. It works in conjunction with the
Save function in the Shift Mode.
1. Press the SAVE/READ button to activate the read data function. The word READ will
be displayed on the LCD.
2. Press the “SECOND” button until the # sign is displayed in the bottom left display.
The location of the read pointer within the saved data table will be displayed.
3. Press the “▲3” or “▼6” button to display the next data location.
Press the “▲2” or “▼5” button to increment the data location by ten.
4. Press the overlay “ESC” button to deactivate the read data function.
LOG/READ Button
The read log function is used for reading logged data. It works in conjunction with the Log
function in Shift Mode.
1. Press the LOG/READ button to activate the read log function. The word READ will be
displayed in the lower right display.
2. Press the overlay “SECOND” button to rotate through the following display menus:
T1, T2, GRP, and #. T1 and T2 displays the T1 or T2 saved value. GRP displays the
current group number and # displays the current location of the read pointer within a
selected group.
3. The arrow buttons on the overlay are used for scrolling through the saved data.
Press the “▲3” or “▼6” buttons to display the next data location or group.
Press the “
ten. To navigate around the logged data and groups, press the overlay “SECOND”
button until “GRP” appears in the display. Select the group using the arrow buttons,
then press the “SECOND” button again until the “#” sign is displayed. The location of
the read pointer will be displayed. Use the arrow keys to scroll through the data.
4. Press the overlay “ESC” button to deactivate the read log data function.
▲2” or “▼5” buttons to increment to the next data or group location by
4
421509 Version 2.0 10/07
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