OPERATING INSTRUCTIONS
MODEL HH801B
DUAL INPUT J/K/T/E
DIGITAL THERMOMETER
MADE IN TAIWAN
FEATURES:
Highly accurate thermometer with 0.1% basic accuracy.
Three displays for easy observations.
Thermocouple offset adjustment.
Four thermocouple types K/J/T/E for common use.
Robust protective holster.
Auto-Power Off and Backlight functions.
MIN/MAX/AVG/REL/HOLD/ functions.
SAFETY INFORMATION
It is recommended that you read the safety and opera-
tion instructions before using the thermometer.
WARNING
To avoid electrical shock, do not use this instrument
when working voltages at the measurement surface
over 24V AC or DC.
WARNING
To avoid damage or burns, do not make temperature
measurement in microwave ovens.
CAUTION
Repeated sharp flexing can break the thermocouple
leads. To prolong lead life, avoid sharp bends in the
leads, especially near the connector.
The symbol on the instrument indicates that the opera-
tor must refer to an explanation in this manual.
SPECIFICATIONS
ELECTRICAL
Temperature Scale: Celsius or Fahrenheit user-selectable
Measurement Range:
Thermocouple Range
K-TYPE(0.1°C) -200°C to 1372°C, -328°F to 1999°F
J-TYPE(0.1°C) -210°C to 1200°C, -346°F to 1999°F
T-TYPE(0.1°C) -200°C to 400°C, -328°F to 752°F
E-TYPE(0.1°C) -220°C to 1000°C, -364°F to 1832°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 -220°C
±(0.1%rdg+2°F) on -76°F to 1999°F
±(0.1%rdg+4°F) on -76°F to -364°F
ENVIRONMENTAL
Ambient Operating Ranges:
0°C to 50°C (32°F to 122°F) <80% R.H.
Storage Temperature:
-20°C to 60°C (-4°F to 140°F) <70% R.H.
GENERAL
Display:3_ digit liquid crystal display (LCD) with a
maximum reading of 1999.
Polarity:Automatic, positive implied, negative polarity
indication.
Overrange:“OL” or “-OL” is displayed.
Zero:Automatic.
Low battery indication: The “ ” is displayed when the
battery voltage drops below the operating level.
Measurement rate: 1 sample/second.
Accuracy:Stated accuracy at 23°C±5°C, <75% R.H.
Dimensions:160mm (H) x 83mm (W) x 38mm(D).
Weight: approx. 265g including batteries.
OPERATING INSTRUCTIONS
1. “ ” Power Button
The “ ” key turns the thermometer on or off. In the
MAX/MIN record mode the meter cannot be powered
off. With the power off, push and hold this key for more
than 4 seconds to disable auto power-offand turn the
meter on.
2. “HOLD” Button
Press the “HOLD” key to enter the Data Hold mode,
the “HOLD” annunciator is displayed. When HOLD
mode is selected, the thermometer holds the present
readings and stops all further measurements.
Press the “HOLD” key again to cancel HOLD mode
and allow the thermometer to resume taking measure-
ments. In the MAX/MIN recording mode, press the
“HOLD” key to stop the recording. Press “HOLD” key
again to resume recording. (Previously recorded read-
ings are not erased.)
3. ” /°F” Button
Press“ ”button to toggle ON or OFF the backlight.
Thebacklight will switch-off automatically after 30 sec-
onds. Readings are displayed in either degrees Celsius
(°C)or degrees Fahrenheit (°C). When the thermometer
isturned on, it is set to the temperature scale that was in
use when the thermometer was last turned off. To
change the temperature scale, press the “ /°F”button
for more than 2 seconds.
4.“REL” Button
Pressthe “REL” key to enter the Relative mode, zero
the display, and store the displayed reading as a refer-
ence value. The annunciator REL will appear on the
LCD. Press the “REL” key for more than 2 seconds to
exit the relative mode. The relative value can also be
enteredby theuser.(See “SET mode” later inthis man-
ual). When the desired Relative value has been entered,
pressthe “SET” key to set Relative value as a reference
value. Press “REL” key again to exit the relative mode.
In the Relative mode, the value (can not be greater
than ±2,000 counts) shown on the LCD is always the
differencebetween the stored reference and the present
reading.
5. “Type” Button: K/J/T/E Thermocouple Type
The“TYPE” key selects the thermocouple type to be
usedas an input.When the thermometer is turned on, it
is set to the type that was in use when the thermometer
was last turned off.
6. “MAX/MIN” Button: Record mode
Press “MAX/MIN” key to enter the MAX/MIN Re-
cording mode, (displays the Maximum reading, Mini-
mum reading, “MAX-MIN” reading and Average read-
ing stored in record mode). In this mode the automatic
power-offfeature is disabled and “ ”key and all func-
tion keys are disabled. The beeper emits a tone when a
new maximum or minimum value is recorded.
Push “MAX/MIN” key to cycle through the MAX,
MIN, MAX-MIN and AVGreadings. If overload is re-
corded, the averaging function is stopped and average
value displays “-OL”. In this mode, press the “HOLD”
keyto stop the recording of readings, all values are held,
press again to resume recording. To prevent accidental
loss of MAX, MIN, “MAX-MIN” and AVGdata, this
modecan only be cancelled by pressing and holding the
MAX/MINkey for 2 seconds to exit and erase recorded
readings.
7.“Hi/Lo” Button: LIMITS mode
Press the “Hi/Lo” key to enter the Hi/Lo LIMITS
comparativemode, “LIMIT”is displayed. When the in-
put temperature value is above the Hi value, the beeper
emitsa continuous tone and “Hi” is displayed. When in-
puttemperature value is below the Lo value, the beeper
emits a pulsed tone and “Lo” is displayed. Press the
“Hi/Lo” LIMIT key again to exit the Hi/Lo LIMIT
mode.
8.“ ” Button
The ” ” key increases the value of the selected
digit.(See “SET mode” later in this manual.)
9.“TC OFFSET” Button
This button allows theuser to adjust theCold Junc-
tion Compensation offset up to ±5.0counts. This value
isused to compensate for thermocouple sensor error.
When a value is entered,the readings displayed on the
LCD will be automaticallyadjusted toinclude this off-
set. (See “SET mode” later in this manual.)
10. “ ” Button
The “ ” key moves tothe next digiton the display
(See “SET mode” later in this manual.)
11.“ ” Button
The“ ” keydecreasesthe value ofthe selected digit
(See “SET mode” later in this manual.)
12. “SET” Button
Allows user to set the Relative value, Hi/Lo Limits
value and ColdJunction Compensation value. Press
“SET”key to enter SET mode. The LCD displays“SET”
and set annunciator is show in the upper right.
Set Relative value:
Press “SET” key to enter SET mode, then Press
“REL” button to set relative value. SET”, “REL” and
“T1” annunciators are displayed.
Press “_” or ” ”to increaseor decrease the value of
theflashing digit,press “ ”to advance to the next digit
Use “_”or ” ”to set positiveor negative for this rela-
tivevalue. Thenpress the ”ENTER” key to setthe rela-
tivevalue for T1. Followthe same procedure for T2. In
this Relative SET mode, the value can not begreater
than ±1999.9 counts. If this value more than ±1999.9
counts, “Err” displayed anda valid offsetmust be en-
tered.
Set Hi/Lo Limit value:
Press“SET” key to enterSETmode, then Press Hi/Lo
buttonto setHi/Lo Limit value. “SET”, “LIMIT”, “Hi”
and “T1” annunciator are displayed.
Press “_” or ” ”to increase ordecrease the value of
theflashing digit,press “ ”to advance to the next digit
Use“ ” or” ”to set positive or negative forthis Hi/Lo
Limit value. Then press the“ENTER” key tostore the
Hilimit value for T1. Followthesame procedure for T2
In this Hi/LoLimit SETmode, the valuecan not be
greater than ±1999.9counts. Ifthis valuemore than
±1999.9 counts, “Err” displayed anda valid limit must
be entered.
Set Cold Junction Compensation (TC OFFSET):
Press SET key to enter SET mode,then Press TC
OFFSETbutton toset TC OFFSET value. First,“CJC”
isdisplayed onLCD. Themeter will then enter SET
TC OFFSET mode.“SET” and“T1” annunciator are
displayed.
Press “ ” or ” ”to increaseor decrease the value of
theflashing digit,press “ ” to advance to the next digit
Press “ ” or ” ”to setpositive or negative forthis TC
OFFSET value. Then press the “ENTER”key to store
the TC OFFSET value for T1, next enter the TC
OFFSETvalue forT2. In this TC OFFSET SETmode,
the value can not be greater than±5.0 counts.If this
value more than±5.0 counts, “Err” displayed and a
valid offset must be entered.