key again cancels HOLD mode, causing the thermome-
ter to resume taking measurements.
Input Connector:
Accepts standard miniature thermocouple connectors (flat
blades spaced 7.9mm, center to center).
INTRODUCTION
This instrument is a portable 3½ digit, compact-sized
digital thermometer designed to use external K-type ther-
mocouples as temperature sensor. Temperature indication
follows National Bureau of Standards and IEC 584 tem-
perature/voltage tables for K-type thermocouples. Two
K-type thermocouple is supplied with the thermometer.
5. “REL” Button
HH12B
Press “REL” key to enter Relative mode, zero the dis-
play, and store the displayed reading as a reference
value and annunciator REL is displayed. Pressing
“REL” key over 2 seconds to exit the relative mode.
ENVIRONMENTAL
Ambient Operating Ranges:
0°C to 50°C (32°F to 122°F) <80% R.H.
Storage Temperature:
DIGITAL THERMOMETER
M4614-0208
IN STRU C TIO N
SHE E T
-20°C to 60°C (-4°F to 140°F) <70% R.H.
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6. “APO” Button
INTRODUCTION
Pressing “APO >2S °C/°F” key to trigger on or off APO
mode, and then APO annunciator will appear or disap-
pear on the display. Power is automatically turn off, if
no operation for a period of time, and “APO” annuncia-
tor is displayed at upper-left corner when APO function
is enabled.
GENERAL
Display: 3½ digit liquid crystal display (LCD) with maxi-
mum reading of 1999.
Low battery indication: The “ ” is displayed when the
battery voltage drops below the operating level.
Measurement rate: 1 time/second.
This instrument is a portable 3½ digit, compact-sized
digital thermometer designed to use external K-type ther-
mocouples as temperature sensor. Temperature indication
follows National Bureau of Standards and IEC 584 tem-
perature/voltage tables for K-type thermocouples. Two
K-type thermocouple are supplied with the thermometer.
Operating environment: 0°C to 50°C at<70% R.H.
Storage temperature: -20°C to 60°C, 0 to 80% R.H. with
battery removed from meter.
Accuracy: Stated accuracy at 23°C±5°C, <75% R.H.
Battery: Standard 9V battery (NEDA 1604, IEC 6F22).
Battery Life: 100 hours typical with carbon zinc battery.
Dimensions: 210mm(H) x 65mm(W) x 35mm(D).
Weight: approx. 292g including battery.
Supplied Wire: 4 feet type “K” thermocouple bead wire
(Teflon tape insulated). Maximum insulation temperature
260°C (500°F). Wire accuracy ±2.2°C or ±0.75% of read-
ing (whichever is greater) from 0°C to 800°C.
7. “MIN/MAX” Button
SAFETY INFORMATION
It is recommended that you read the safety and opera-
tion instructions before using the thermometer.
Press “MIN/MAX” once to begin recording MIN and
MAX. Press “MIN/MAX” to select MIN or MAX or
MAX-MIN or AVG Hold down for 2 seconds to exit
MIN/MAX function.
WARNING
In the MIN/MAX record mode can not power off, must
leave MIN/MAX record mode then power off.
To avoid electrical shock, do not use this instrument
when working voltages at the measurement surface
over 24V AC or 60V DC.
OFFSET ADJUSTMENT
The OFFSET control is set at the factory to allow for the
variations found in standard thermocouples. By adjust-
ing the OFFSET control, you can optimize measurement
accuracy for a particular thermocouple at a particular
temperature.
WARNING
To avoid damage or burns, do not make temperature
measurement in microwave ovens.
OPERATING INSTRUCTIONS
1. “°C/°F” Button: Selecting the Temperature Scale
Reading are displayed in either degrees Celsius(°C) or
degrees Fahrenheit(°F). When the thermometer is turned
on, it is set to the temperature scale that was in use
when the thermometer was last turned off. To change
the temperature scale, hold down for 2 seconds “APO
>2S °C/°F” key.
CAUTION
Repeated sharp flexing can break the thermocouple
leads. To prolong lead life, avoid sharp bends in the
leads, especially near the connector.
Adjusting for T1 or T2 Accurate Measure-
ments
1. Connect the thermocouple to the T1 or T2 input con-
nector and turn the thermometer on.
The
symbol on the instrument indicates that the op-
2. Place the thermocouple in a known, stable temperature
environment at or near the temperature you wish to
measure, and allow the readings to stabilize.
3. Slowly adjust the OFFSET control so that the ther-
mometer reading matches the temperature of the known
environment. Leave sufficient time between adjustments
to allow for measurement lag.
4. The calibration of the thermometer-thermocouple com-
bination is now optimized for measurements near the
temperature measured in step 2.
erator must refer to an explanation in this manual.
2. Single-Thermocouple Temperature Measurement
The thermometer displays the temperature of the ther-
mocouple that is connected to the selected input. Press
the “T2” key to display the temperature of the thermo-
couple connected to the T2 input. Press the “T1” key to
display the temperature of the thermocouple connected
to the T1 input. The input selection cursor indicates
which input is selected.
SPECIFICATIONS
ELECTRICAL
Temperature Scale: Celsius or Fahrenheit user-selectable
Measurement Range:
-200°C to 1372°C, -328°F to 1999°F
Auto range: 0.1°C/1°C, 0.1°F/1°F
Accuracy: Accuracy is specified for operating tempera-
tures over the range of 18°C to 28°C (64°F to 82°F), for 1
year, not including thermocouple error.
±(0.1%rdg+1°C) on -60°C to 1372°C
±(0.1%rdg+2°C) on -60°C to -200°C
±(0.1%rdg+2°F) on -76°F to 1999°F
±(0.1%rdg+4°F) on -76°F to -328°F
Temperature Coefficient:
3. Differential Temperature Measurement
Differential temperature measurement is selected by
pressing the “T1-T2” key. This causes the thermometer
to display the temperature difference between the two
thermocouples (the temperature of thermocouple T1
minus the temperature of thermocouple T2). The selec-
tion is indicated by the input selection cursor.
Resetting the OFFSET Control
To return the OFFSET control to the factory setting
without having to recalibrate the thermometer, perform
the following procedure:
1. Connect a thermocouple that is in good working order to
the input that is to be adjusted.
2. Place the thermocouple in an ice-water bath and allow
the readings to stabilize.
3. Slowly adjust the OFFSET control until the thermome-
ter reads 0°C (32°F).
0.1 times the applicable accuracy specification per °C from
0°C to 18°C and 28°C to 50°C (32°F to 64°F and 82°F
to122°F).
Input Protection:
60V dc or 24V ac rms maximum input voltage on any
4. “HOLD” Button
Press the “HOLD” key to enter the Data Hold mode, the
“HOLD” annunciator is displayed. When HOLD mode
is selected, the thermometer held the present readings
and stops all further measurements. Press the “HOLD”
combination of input pins.
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