Extech Instruments 421509 Manuel utilisateur

USER 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 LCD Display

T1 / T2 / T1 – T2 displays

MIN / MAX / AVG Record/Recall

Selectable temperature units (C/F)

Data Hold, Relative Mode, Elapsed Timer

PC Interface

ESC - 0 ENTER

123

456

789

DISPLAY

¡C/¡F

[Limits]

LOG

READ

TYPE

T1/T2

REL

HOLD

SHIFT

[OFS]

CLR ?

SET[ ]

SAVE

READ

[TIME]

T1-T2

[APO]

MAX/MIN

[INVT]

TYPE

T1/T2

MAIN

SECOND THIRD

421509

¡F T1-T2

APO

¡F T1

421509-en-GB_v2.6 8/16

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 the supplied software and

cable. This professional meter, with proper care, will provide years of safe reliable service.

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

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

ESC - 0 ENTER

123

456

789

DISPLAY

¡C/¡F

[Limits]

LOG

READ

TYPE

T1/T2

REL

HOLD

SHIFT

[OFS]

CLR ?

SET[ ]

SAVE

READ

[TIME]

T1-T2

[APO]

MAX/MIN

[INVT]

TYPE

T1/T2

MAIN

SECOND THIRD

421509

¡F T1-T2

APO

¡F T1

421509-en-GB_v2.6 8/16

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 (INVT)

Press the backlight button to toggle the backlighting on and off.

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 “▲2” or “▼5” buttons to increment to the next data or group location by 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.

421509-en-GB_v2.6 8/16

HOLD Mode (Main Display only)

Press the HOLD button to enter the Data Hold mode, the "HOLD" annunciator will display. When

HOLD is selected, the thermometer freezes the reading on the main display only. Press the HOLD

button again to return to the normal measurement mode.

MIN/MAX with Time Record Mode (Main Display only)

Note: Auto Power OFF and several keys (Power, C/F, REL, SET, HI/LO, TYPE, and T1, T2, T1-T2)

are defeated in this mode

Press MIN MAX to enter the MIN/MAX recording mode; the meter will begin keeping track of the

highest (MAX), lowest (MIN), MAX-MIN, and Average (AVG) readings. There are four displays

(listed below) for this mode. Use the MIN MAX key to scroll through all four.

1. When the “REC” icon is on the display (top), the meter is displaying measurements normally

while it is recording.

2. With the “REC MAX” icon on the display, the meter continues taking measurements but the

main display shows only the highest (MAX) reading recorded. The Elapsed Time (in hours,

minutes, and seconds) is shown in the lower right LCD field. The Timer shows when the MAX

reading was taken.

3. With the “REC MIN” icon on the display, the main display shows only the lowest reading

recorded. The Time of the MIN reading is shown in the lower right LCD field.

4. With the “REC MAX-MIN” icon on the display, the main display shows the difference between

Max and Min.

5. With the “REC AVG” icon on the display, the main display shows only the average of all the

readings recorded. Note that the averaging limit is 22 hours. After 22 hours, the last average

reading display is held on the LCD.

The meter emits a tone when a new minimum or maximum value is recorded. Use the HOLD button

to pause recording (all values are then held). Press HOLD again to resume recording. To exit the

MIN MAX mode press and hold the MIN MAX button for more than 2 seconds until the “REC” icon

switches off.

T1/T2 Button (Main Display)

Press this button to select which thermocouple input configuration is represented on the main

display; ‘T1’ will display for thermocouple input 1 or ‘T2’ for thermocouple 2. When the meter is

turned on, it is set to the display that was in use when the meter was last powered off.

T1/T2 (Second Display)

Press this button to select which input is shown on the secondary display (lower left display); T1 for

thermocouple 1 or T2 for thermocouple 2. When the meter is turned on, it is set to the display that

was in use when the meter was last powered off.

T1-T2/Time (Third Display)

Press this button to select system time, date, or the differential between the two thermocouples (T1-

T2) for the third display (lower right display). When the meter is turned on, it is set to the display that

was in use when the meter was last powered off.

421509-en-GB_v2.6 8/16

Shift Mode

The operating functions for the shift mode are printed in yellow on the buttons. When in normal

mode, push the SHIFT button to switch to shift mode. The word “Shift” will be displayed in the lower

right corner of the LCD. To switch back to normal mode, press the SHIFT button again.

°C/°F Key

Readings can be displayed in degrees Celsius (°C) or degrees Fahrenheit (°F). Note that the meter

remembers the unit of measure when it is turned off. Press the °C/°F key to change the temperature

units.

SAVE Button

The save function stores T1 and T2 measurements in up to 128 locations in non-volatile memory.

Press the SAVE button to store the current reading, the word “SAVE” is momentarily displayed on

the bottom right LCD to indicate that the data has been saved. Data can be read using the read

function in normal mode.

LOG Button

The data log function continuously records measurement data using the stored sampling interval.

The time interval is set using the interval time setup function [INTV] in the setup mode.

Press the LOG button to activate the log function. “LOG” will be displayed and “MEM” will

continuously flash on the LCD. There are 16 groups that are used for storing the log data and each

group has 64 data locations. If the current session exceeds 64 locations, the log function will

automatically use the next group to continue storing the data. A maximum of 1024 locations can be

saved in one log session.

Press the LOG button again to exit the data log function.

CLR ? Button

The CLR function clears all the saved and logged data in memory. When the CLR button is pressed,

“MEM” is displayed and “CLR” flashes on the upper right of the LCD.

Press the overlay “ENTER” button to clear all saved and logged data, or the “ESC” button to exit the

function.

REL Button

Press the REL key to enter the Relative mode. The meter will store the displayed reading (main

display) as a reference value and display ‘REL’. All subsequent readings will now display the

measured value less the stored reference value.

Press the REL key again to exit the relative mode.

[APO] Button

Press the APO button to enable/disable auto power off. “APO” is displayed on the upper left of the

LCD. When enabled, it will automatically turn the thermometer off if the key switch is inactive for the

preset auto power off time (default time for APO is 5 minutes). The time can be programmed in

Setup Mode. Press the Power button to resume operation.

Type Button (Main display

Press the TYPE button to select the thermocouple type (K, J, T, E, R, S, or N) in the main display. If

the inputs of the main and second display are the same, then pressing this button will change the

thermocouple type for both displays. The selected type becomes the default selection.

Type Button (Second display)

Press the TYPE button to select the thermocouple type (K, J, T, E, R, S, or N) in the second display.

If the inputs of the main and second display are the same, then pressing this button will change the

thermocouple type for both displays. The selected type becomes the default selection.

421509-en-GB_v2.6 8/16

Lo Limit

Pin 3 (+)

Pin 4 (-)

Figure 4

Hi Limit

Pin 1 (+)

Pin 2 (-)

Figure 3

Pin 5

Pin 1

Figure 1

Pin 2

Pin 4

Pin 6

Pin 3

Pin 5 (+)

Pin 6 (-)

Figure 2

5to30V

Setup Mode

The operating functions for the setup mode are printed between the bracket “[ ]” signs on each

button. Press the SET [ ] button in normal mode to switch to the setup mode. The indicator “SET”

will be shown on the left side of the display. Press SET [ ] again to return to normal mode.

Hi/Lo Limit Setup

In Setup Mode, press the [Limits] button to enter the Hi/Lo setup function. The “LIMIT”, “HI”, and

main display will blink on the LCD and the previous settings will be displayed. Press the number

buttons (printed in white) on the overlay to set Hi and Lo limit values. The button “-“ (same as the

ESC overlay) can be used to set a negative value. Setting is from left to right digit. Press the

ENTER button to confirm each setting.

Mini DIN Hi/Lo Alarm Output

The alarm output jack (refer to Figure 1), located on the top of the meter, can be used to power

external warning or switching devices when programmed Hi/Lo alarm limits are reached. To enable

this function, an external power source (5 to 30VDC, 5mA max) must be used to supply power to

the connected device. Connect the power source (5-30VDC) between pin 5 (+) and pin 6 (-) of the

connector (refer to Figure 2). For the Hi limit output, connect a device between pin 1 (+) and pin 2 (-)

(refer to Figure 3). For the Lo limit output, connect a device between pin 3 (+) and pin 4 (-) (refer to

Figure 4).

421509-en-GB_v2.6 8/16

Interval Time Setting

To set up the interval time for the log function, press the [INVT] button. The indicator “INV” will blink

at the top right of the LCD and previous settings are displayed. Press the number buttons (printed in

white) on the overlay to change the time setting. Setting changes from left to right in the following

format: HH:MM:SS. Press the ENTER button to confirm. Press the “ESC” button to exit this function.

HH: 0-23

MM: 0-59

SS: 0-59

MAX: 23:59:59

MIN: 00:00:01

Auto Power Off Time Setting

Press the [APO] button in Setup Mode. The indicator “APO” and the main display will blink on the

LCD showing the previous setting. Press the number buttons (printed in white) on the overlay to

change the APO time. Press the ENTER button to confirm. To exit this function without changing the

setting, press the ESC button.

MAX: 19999 minutes

MIN: 0005 minutes

Thermocouple Offset Adjustment

To change the offset for T1, the main display input should be set to T1. Set the main display to T2

for adjusting the offset to T2. Press the [OFS] button to enter the offset adjustment mode. “CAL” will

be displayed on the top right of the LCD and the main display will blink showing the previous setting.

Press the number buttons (printed in white) on the overlay to change the offset. The resolution is

0.1°. Use the “-” button to set a negative value. Press the ENTER button to confirm.

MAX: ±1999.9°C/°F

System Time Setting

To set or change the system time, press the [TIME] button in Setup Mode. The time and date in the

bottom right display will blink. Enter from left to right YY:MM:DD and HH:MM:SS. Press the number

buttons (printed in white) on the overlay to change the settings. Press the ENTER button to confirm.

Exit this function by pressing the ESC button.

Error messages:

If Err-02, Err-02 or Err-03 appears in the display, one of the following conditions has occurred:

Err-01: In the “SAVE” mode, the maximum recording range is 128 samples. The lower right display

will show Err-01 if the maximum capacity of 128 samples has been reached.

Err-02: In the “LOG” mode, the maximum recording is 16*64=1024 samples. The lower right display

will show Err-02 if the maximum capacity of the 16 groups has been reached.

Err-03: In the “READ LOG” and “READ SAVE” mode, when the main display shows 6208 and the

lower right display shows “OL, Err-03”, one of the following conditions has occurred::

1. There is no data in the memory.

2. The memory is full, and the meter will warn the user this is the last sample.

SAVE=128 samples

LOG=1024 samples

421509-en-GB_v2.6 8/16

Battery Replacement

Replace the battery when the low battery indication symbol appears on the upper left corner of the

display. To replace the battery, remove the protective rubber holster to access the battery

compartment. Remove the two screws that secure the rear battery compartment cover. Remove the

old battery, install a new one, and replace cover.

RS-232 PC Interface

The Model 421509 Thermometer is supplied with a Windows® software package on CD-ROM. A

communications cable (meter to PC) is also supplied. The program allows the user to operate the

meter remotely and view the readings from all three LCD fields on the PC monitor. The software also

permits measurement data to be stored as text files on a PC. The data files can then be exported to

spreadsheet or other programs for further manipulation (graphing, sorting, filing, etc.).

Connecting the Meter to a PC

Connect the Optical Interface connector to the 421509 Thermometer. The “IR2” label should be facing

up. Connect the USB connector to the PC (COM port 1 -16).

PC Requirements

Note: Please visit the www.extech.com website for the latest software, user manuals, operating

system compatibility, etc., as requirements and other information may change from time to time.

486-33 IBM compatible PC or better

One CD-ROM drive

Available USB port.

Windows XP, Windows 7, Windows 8.1 and Windows 10

USB cable part # 421509-USBCBL

Please consult the separate Software Help guide for instructions on how to use the software.

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www.extech.com

421509-en-GB_v2.6 8/16

Specifications

General Specifications

Display 4-1/2 digit (19,999), 3-Display, LCD with LED Backlighting

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),

1oF > 2000°

J type -346 to 2192oF (-210 to 1200oC) 0.1oF (0.1oC),

1oF > 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 + 1.4oF) -58oF to -346oF

±(0.05% rdg + 0.3oC) -50oC to 1370oC

±(0.05% rdg + 0.7oC) -50oF to -210oC

N type ±(0.05% rdg + 1.6oF) -58oF to 32oF

±(0.05% rdg + 0.8oF) 32oF to 2372oF

±(0.05% rdg + 0.8oC) -50oC to 0oC

±(0.05% rdg + 0.4oC) 0oF to 1300oC

R, S types ±(0.05% rdg + 4.0oF) 32oF to 3212oF

±(0.05% rdg + 2.0oC) 0oC to 1767oC

Temperature

Coefficient 0.1 multiplied by the accuracy per oC from 0oC to 18oC and 28oC to 50oC

(32oF to 64oF and 82oF to 122oF)

Supplied

Thermocouples 4', type K (with teflon insulation) Max insulation temp: 500oF (260oC)

Accuracy: ± 4oF (±2.2oC) or ± 0.75% of rdg (whichever is greater) from

32 to 1472oF (0 to 800oC)

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