Omega Engineering HH502 User manual

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User’s Guide
HH502
Digital Thermometer
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It is the policy of OMEGA Engineering, Inc. to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is
constantly pursuing certification of its products to the European New Approach Directives. OMEGA will add the CE mark to every
appropriate device upon certification.
The information contained in this document is believed to be correct, but OMEGA accepts
no liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, human applications.
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The symbol on the instrument indicates that the operator must refer to an
explanation in this manual.
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.
INTRODUCTION
This instrument is a 4½ digit, compact-sized portable digital thermometer
designed to use external K-type and J-type thermocouples as temperature
sensor.TemperatureindicationfollowsReferenceTemperature/VoltageTables
(N.I.S.T. Monograph 175 Revised to ITS-90) for K-type and J-type thermo-
couples. Two K-type thermocouple are supplied with the thermometer.
SAFETY INFORMATION
Itisrecommendedthatyoureadthesafetyandoperationinstructionsbefore
using the thermometer.

SPECIFICATIONS
ELECTRICAL
Temperature Scale: Celsius or Fahrenheit user-selectable.
Measurement Range:
J-TYPE -200°C to 1050°C, (-328°F to 1922°F)
K-TYPE -200°C to 1370°C, (-328°F to 2498°F)
Resolution: 0.1°C or 0.2°F.
Accuracy:Accuracyisspecifiedforoperatingtemperaturesovertherangeof
18°C to 28°C (64°F to 82°F), for 1 year, not including thermocouple error.
±(0.05% rdg + 0.3°C) -50°C to 1370°C
±(0.05% rdg + 0.7°C) -50°C to -200°C
±(0.05% rdg + 0.6°F) -58°F to 2498°F
±(0.05% rdg + 1.4°F) -58°F to -328°F
TemperatureCoefficient:0.1timestheapplicableaccuracyspecificationper
°C from 0°C to 18°C and 28°C to 50°C (32°F to 64°F and 82°F to 122°F).
Input Protection: 24V dc or 24V ac rms maximum input voltage on any
combination of input pins.
Maximum Differential Common Mode Voltage (Maximum Voltage be-
tween T1 and T2 during measurement): 1volt.
Reading Rate: one time per second.
Input Connector: Accepts SMP male miniature thermocouple connectors.
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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:4½digitliquidcrystaldisplay(LCD)withmaximumreadingof19999.
Overload: "----.-" is display.
Battery: Standard 9V battery.
Battery Life: 100 hours typical.
Auto power off: The meter key switch inactive for more than 30 minutes,
press power key to resume operation.
Dimensions: 192mm(H) x 91mm(W) x 52.5mm(D).
Weight: 365g.

OPERATING INSTRUCTIONS
Power Switch
The key turns the thermometer on or off. In the data SET mode, can not
power off, must leave data SET mode then power off.
°C/°F Selecting the Temperature Scale
Readings are dual 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, press the °C/°F key.
HOLD Mode (only Main display)
Pressing the HOLD key to enter the Data Hold mode, the "HOLD" annun-
ciator is displayed. When HOLD mode is selected, the thermometer held
the present readings and stops all further measurements.
PressingtheHOLDkeyagaintocancelHOLDmodecausing thermometer
to resume taking measurements.
In the MIN/MAX recording mode, press HOLD key to stop the recording.
Press HOLD key again to resume recording. (Previously recorded reading
are not erased).
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T1 /T2/T1-T2 Main display Input Selection
The input selection indicates which input is selected for main display; T1
thermocouple,T2thermocoupleorthedifferencebetweenthetwothermo-
couples (T1-T2), when the thermometer is turned on, it is set to T1, When
main display input selected T1, then T1 input can select alternate of
thermocouple by pressing K/J key switch.
K/J T1 Input Thermocouple Type Select (Main display)
The K/J key switch the T1 input selects the K-type or J-type thermocouple
as input, when main display input selected T1.
When the thermometer is turned on, it is set to the type selected that was
in use when the thermometer was last turned off.
MIN MAX with Time record Mode (only Main display)
Press MIN MAX key to enter the MIN MAX Recording mode, (displays the
Maximum reading with time, Minimum reading with time and Average
reading stored in record mode). In the this mode the automatic power-off
featureis disabledand key,°C/°Fkey,RELkey,SETkey,Hi/LoLIMITS
key and main display T1 T2 T1-T2 key, K/J key are disabled.
The beeper emits a tone when a new minimum or maximum value is
recorded.
Push MIN MAX key to cycle through the MAX, MIN and AVG readings.
If an overload is recorded, the averaging function is stopped and average
value display"----.-".

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In the this mode, press HOLD key to stop the recording of readings, all
values are frozen, press again to restart recording.
TopreventaccidentallossofMIN,MAXandAVGdata,inthismodecanonly
becancelledbypressingandholddowntheMINMAXkeyfor2secondsto
exit and erased recorded readings.
WARNING
MIN,MAXandAVGreadingscanberecordedforaperiodofupto20hours
maximum. If this 20 hours period is exceeded the unit readings will not be
accurate.
REL Relative mode (only Main display)
Pressing REL key to enter the Relative mode, zero the display, and store
the displayed Reading as a reference value and annunciator REL is
displayed. Press REL key again to exit the relative mode.
The relative value can also be entered by the user. (See "SET mode" later
in this manual.)
WhenthedesiredRelativevaluehasbeenentered,pressRELkeytoenter
the Relative mode, press SET key use set Relative value as a reference
value. Press REL key again to exit the relative mode.
In the Relative mode, the value (can not >±3000.0 counts) shown on the
LCDisalwaysthedifferencebetweenthestoredreferenceandthepresent
reading.

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Sec. Minu. Selecting the Time scale
Reading the third displayed (Time) in either second or minute. When the
thermometerturnedon,itissettosecond.TochangetheTimescale,press
sec. Minu. key.
Maximum Time reading is 100 hours. If 100 hours is exceeded, reset Time
to zero and restart.
SET mode (Relative value set, Time set and Hi/Lo Limits value set)
1. Press SET key to enter Relative valuse SET mode (Press ENTER key can
escape relative valuse set mode), REL set mode. = = = =.= is displayed in
main display.
Relativevalueisenteredviaoverlaynumbers,thenpressoverlayENTERkey,
stored the relative value, enter Time set mode.
2. Time set mode, (Press ENTER key can escape Time set mode)
=.= ==:==isdisplayedinsecondandthirddisplay.Time(hours,minutes,
seconds)valueisenteredviaoverlaynumbers,thenpressoverlayENTER
key. Time start from set time value, enter Hi/Lo Limits value set mode.
3. Hi Limit value set mode, is displayed (Press ENTER key can escape Hi
Limit value set mode), = = = =.= is displayed in main display, Hi Limit value
is entered via overlay numbers, then press overlay ENTER key, stored the
HiLimitvalue,enterLoLimitvaluesetmode(Press ENTERkeycanescape
Lo Limit value set mode). = = = =.= is displayed in main display, Lo Limit
value is entered via overlay numbers, then press overlay ENTER key,
stored the Lo Limit value and exit SET mode.

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4.Whenthethermometeristurnedon.TheRelativesetvalueandHi/LoLimits
setvaluethat was in usewhenthermometerwas last turned offsetvalues.
T1/T2/T1-T2 second display Input Selection
Theinput selectionindicateswhichinputisselectedforseconddisplay;T1
thermocouple,T2thermocoupleorthedifferencebetweenthetwothermo-
couples (T1-T2), when the thermometer is turn on, it is set to T2 input can
select alternate of thermocouple by second display K/J key switch.
K/J T2 Input thermocouple type select (second display)
The K/J key switch the T2 input selects the K-type or J-type thermocouple
as input, when second display input selected T2.
When the thermometer is turned on, it is set to the type selected that was
in use when the thermometer was last turned off.
Hi/Lo Limits mode (only Main display)
Press Hi/Lo Limits key to enter the Hi/Lo Limits comparative mode, is
displayed,wheninputtemperaturevalueexceedHiorLoLimitsvalue.The
beeper emits a continuity pulse tone. Press Hi/Lo Limits key again to exit
the Hi/Lo Limits mode.
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