User's Guide
Differential Thermometer Datalogger
Model HD200
Introduction
Congratulations on your purchase of the Extech HD200 Differential Thermometer
Datalogger. The HD200 supports differential temperature measurements using dual
Type K thermocouple probe inputs and provides selectable units of °C, °F or °K. The
large backlit LCD displays a versatile combination of readings: T1, T2, T3, T1-T2, T1-T3,
T2-T3, plus MAX-MIN-AVG readings.
The electronic offset feature permits compensation adjustment for thermocouple errors
and to maximize overall accuracy.
The HD200 can also make non-contact temperature measurements with the supplied IR
thermometer probe.
The HD200 datalogger can store 18,000 measurement readings (for each channel) in
the meter’s internal memory. Stored readings can later be transferred to a PC using the
supplied PC USB interface kit. Real-time meter-to-PC logging is also supported.
This meter is shipped fully tested and calibrated and, with proper use, will provide years
of reliable service.
Safety
Please read the safety and operational instructions before using this device.
WARNING
To avoid electrical shock or instrument damage, do not apply voltage exceeding the
maximums specified.
WARNING
To avoid damage or burns, do not make temperature measurement in microwave ovens.
WARNING
Do not use the meter in any explosive atmosphere.
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.
Double insulation
IR Safety Notes
•
•
•
•
Remove the battery if meter is to be stored for longer than 60 days.
Use extreme caution when the laser pointer beam is on
Do not point the beam toward anyone's eye or allow the beam to strike the eye from a
reflective surface
Do not use the laser near explosive gases or in other
potentially explosive areas
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Model HD200 Version 2.0 December 2007
Description
Meter Description
1.
2.
3.
4.
5.
6.
7.
8.
9.
Thermocouple inputs
PC USB interface input
IR probe input jack
Up arrow button
SETUP & Display backlight button
Down arrow and Record button
Temperature units select button
MAX-MIN button
Display configuration button
10. LCD Display
11. ENTER button
12. Battery compartment & Tripod mount (rear)
13. Display HOLD button
14. Power button
Note: Description of IR sensor contained in later section.
Display Description
1.
2.
3.
4.
5.
6.
7.
8.
9.
Thermocouple type (Icon flashes when the
meter is recording)
IR temperature (display flashes when the meter
recording)
Data Hold mode (readings are frozen on
display)
Appears when meter is in the SETUP mode
Primary Display: T1, T2, T3 , T1-T2,T1-T3,or
T2-T3 reading.
Secondary Display: MAX, MIN, AVG, offset,T1,
T2 , or T3 reading.
Temperature unit of measure
Third display. Elapsed timer or T1, T2, T3 reading
Low battery icon
10. Timer
11. MAX, MIN, AVG display mode icons
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Model HD200 Version 2.0 December 2007
Operation
The Basics
1.
2.
Press
to turn the thermometer on. Press and hold the
turn the meter off.
button for 3 seconds to
Press
MAX/MIN
to record and step through the maximum, minimum, and average
readings for the T1 and T2 inputs (does not apply for the T3 IR input). When active,
the display shows the maximum, minimum, or average of the logged readings and the
elapsed time. To exit the
MIN/MAX/AVG
mode press and hold the
MAX/MIN
button
for 3 seconds.
Press °C·°F·°K to switch between Celsius (°C), Fahrenheit (°F), and Kelvin (°K).
Press
HOLD
to freeze or unfreeze the displayed readings.
Press
DIF/T
1
·T
2
·T
3
to scroll through display combinations: T1, T2, T3 and T1-T2, T1-
T2, T2-T3 (differential temperature measurement) in the primary, secondary and third
display.
Press the
Setup/
backlight.
button to turn on the backlight. Press it again to turn off the
3.
4.
5.
6.
7.
8.
Press and hold the
Setup/
button for 5 seconds to enter or exit the Setup mode.
Press
▲
to scroll to a Setup option. (see "Changing Setup Options.")
Press
REC/
▼
to start or stop recording. If in the Setup mode, use this button to scroll
to the Setup option you want to change. Press
REC/
▼
to decrease the displayed
setting.
Press
ENTER
to enter a Setup option. Press
ENTER
again to store the displayed
setting in memory.
9.
Using the thermocouple (s)
1.
2.
Plug the thermocouple(s) into the T1or T2 input connector(s).
to turn on the thermometer. After 1 second the thermometer displays the
Press
reading. If no thermocouple is plugged into the selected input or the thermocouple is
"open," the display shows
"- - - -".
Using the supplied IR (Infrared) Thermometer Probe
Plug the output of the remote IR probe into the T3 (IR input) meter jack (see diagram), “T3
- -
- -”
will appear on screen. If the IR probe is not connected, “T3
- - - -”
will not appear.
Press the external probe’s
“SCAN”
button to take and display a
reading. Use the laser pointer to improve target aim.
While the
SCAN
button is held down, the readings change as the
user scans various surfaces. When the button is released the
display is held for approx. 7 seconds and the meter then returns to
normal operation.
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Model HD200 Version 2.0 December 2007
IR Description
1.
2.
3.
4.
5.
Laser Pointer
IR sensor
Lo Battery led
ON/Scan button
Cable
IR (Infrared) Thermometer Measurement Considerations
•
•
•
•
•
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The object under test should be larger than the spot (target) size calculated by the
field of view diagram.
If the surface of the object under test is covered with frost, oil, grime, etc., clean
before taking measurements.
If an object's surface is highly reflective, apply masking tape or flat black paint to the
surface before measuring.
The meter may not make accurate measurements through transparent surfaces such
as glass.
Steam, dust, smoke, etc. can obscure measurements.
The meter compensates for deviations in ambient temperature. It can, however, take
up to 30 minutes for the meter to adjust to extremely wide ambient temperature
changes.
To find a hot spot, aim the meter outside the area of interest then scan across (in an
up and down motion) until the hot spot is located.
IR measurements cannot be made through glass.
•
•
IR (Infrared) Thermometer Field of View
The meter’s field of view is 8:1. For example, if the meter is 16 inches from the target
(spot), the diameter of the target must be at least 2 inches.
Note that measurements should normally be made less than 2 feet from the target. The
meter can measure from further distances but the measurement may be affected by
external sources of light. In addition, the spot size may be so large that it encompasses
surface areas not intended to be measured.
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Model HD200 Version 2.0 December 2007
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