User's Guide
Microprocessor Calibrator/Thermometer
Models 433201A and 433202A
Introduction
Congratulations on your purchase of the Extech 433201A (115V) or 433202A (220V)
Microprocessor Thermocouple Calibrator/Thermometer.
In the ‘Measurement’ mode, a millivolt (mV) signal is accepted from a thermocouple and
is displayed on the 4-digit LCD display. A built-in temperature offset feature can be used
to compensate for variations found in standard thermocouples. By adjusting the offset,
measurement accuracy for a particular thermocouple can be optimized for a particular
temperature.
In the ‘Source’ mode, a millivolt signal is output to an external device with the
corresponding temperature (according to standard temperature tables) displayed on the
LCD display. Preset temperature settings (source mode only) according to thermocouple
type are stored in five memory locations for easy recall.
If desired, the meter can be switched to the mV mode where Measurement and Source
values can be displayed in millivolts rather than temperature.
Careful use of this device will provide years of reliable service.
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433201A V1.5 05/07
Description
1.
2.
LCD display – Temperature values can be displayed in C/ F or in millivolts. The
adjustable display can be easily moved to the best viewing angle.
POWER/MODE button – Press to power meter on/off and to select the desired
mode of operation. With the meter powered on, momentarily press the
POWER/MODE button (<2 sec) to toggle between MEASURE and SOURCE mode.
In MEASURE mode the meter displays the temperature or mV value for an attached
thermocouple or thermocouple simulator. In the SOURCE mode, the meter outputs
a mV signal.
To power off, press and hold the POWER/MODE button for more than 2 seconds.
FINE/COARSE output adjustment buttons – Use the
▼/▲
buttons to set the desired
temperature. Press and hold for COARSE adjustment; momentarily press for FINE
adjustment.
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3.
4.
5.
6.
C/ F button – Press to select the desired unit of measure
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TYPE button – Press to select a thermocouple type
MEM – In SOURCE MODE, the Memory button provides access to five memory
locations with preset output values depending on which thermocouple type is being
used.
Type
J, K, C, R, S, N
32.0 F
(0.0 C)
M2
M3
M4
M5
212.0 F
(100.0 C)
932.0 F
(500.0 C)
1382.0 F
(750.0 C)
1832.0 F
(1000.0 C)
o
o
o
o
o
o
o
o
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Memory
Location
M1
Type T
Type E
mV
32.0 F
(0.0 C)
212.0 F
(100.0 C)
392.0 F
(200.0 C)
572.0 F
(300.0 C),
752.0 F
(400.0 C)
o
o
o
o
o
o
o
o
o
o
32.0 F
(0.0 C)
212.0 F
(100.0 C)
482.0 F
(250.0 C)
932.0 F
(500.0 C)
1382.0 F
(750.0 C)
o
o
o
o
o
o
o
o
o
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0mV
10.00mV
25.00mV
40.00mV
50.00mV
7.
8.
9.
Output/Input mini connector – Thermocouples, thermocouple wire, and calibration
cables are connected here.
AC adaptor/recharger jack
Battery compartment – Houses the supplied 9V Nickel Metal Hydride rechargeable
battery. An alkaline battery can also be used.
10. Neck Strap Posts- Attach the neck-strap to the two posts on the front corners of the
meter.
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433201A V1.5 05/07
Operation
Measurement Mode
1.
Open the meter lid and press the POWER/MODE button to turn the meter on.
“MEASURE” will be displayed on the LCD screen. Check the battery if the meter
display does not switch on.
Note:
For best accuracy, remove any input connectors before turning the unit
ON. The meter will not perform a correct self calibration if there is an input
connected.
2.
Select the thermocouple type using the
TYPE
button. The T/C type selected will be
indicated along the bottom of the display. Each time the
TYPE
button is pressed
the indicator will advance one type.
Select C or F via the
C/ F
button.
Carefully insert the thermocouple probe into the sub-miniature female connector on
the side panel.
Read the temperature on the LCD display.
To turn the meter off, press and hold the POWER/MODE button for more than 2
seconds.
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o
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3.
4.
5.
6.
Offset Adjustment
Thermocouples produce an output signal that is non-linear. In some instances it may be
necessary to offset the reading to compensate for the non-linearity of the thermocouple.
1.
2.
3.
In Measurement Mode, press and hold the
▼/▲buttons
together until ”OFS” is
displayed on the LCD.
Use the
▼/▲
buttons to adjust the offset from -9.0 to 9.0 F (-5.0 to 5.0 C)
Press and hold the
▼/▲buttons
together for less than 2 seconds to save the offset
and return to Measurement Mode.
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433201A V1.5 05/07
Source Mode
1.
2.
3.
Open the meter lid and press the POWER/MODE button to turn the meter on.
Check the battery if the meter display does not switch on.
Momentarily (<2 sec) press the
POWER/MODE
button to select the SOURCE
mode. “SOURCE” will be displayed on the LCD screen.
Select the thermocouple type of the device to be calibrated using the
TYPE
button.
The T/C type selected will be indicated along the bottom of the display. Each time
the
TYPE
button is pressed the indicator will advance one type
Select °C or °F via the
°C/°F
button.
Carefully insert the calibration cable into the sub-miniature female connector on the
side panel.
Note:
For greater accuracy, especially if there is a difference between the internal temperature of
the calibrator and the device under calibration, use a thermocouple cable rather than the copper
cable that is supplied with the calibrator. The thermocouple cable must match the thermocouple
type of the device under calibration.
6.
Connect the other end of the cable to the device to be calibrated.
Note: The
SOURCE
icon will blink until the output has stabilized.
7.
Allow time for the calibrator and the external device to settle to the same
temperature. This may take up to 30 minutes or longer if the devices were stored or
carried from a colder/warmer environment prior to use.
Use the
▼/▲
FINE/COARSE adjustment buttons or the MEM button to select the
desired output temperature. The output temperature is displayed on the LCD
display.
To turn the meter off, press and hold the POWER/MODE button for more than 2
seconds.
4.
5.
8.
9.
Displaying in mV units
Press and hold the
F/ C
button for more than 2 seconds until “mV” appears on the LCD
display. Press and hold the button again for more than 2 seconds to return to temperature
o o
units ( F/ C).
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Auto Power Off
When the meter is turned on, the auto power off function is enabled. It will automatically
shut the meter off 10 minutes after the last button press. To disable Auto Power Off, press
and hold the
TYPE
button for 2 seconds until “nAtP” is displayed.
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433201A V1.5 05/07
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