Omega HH503 User manual

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User’s Guide
HH503
Digital Thermometer
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WARNING: These products are not designed for use in, and should not be used for, human applications.
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1
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. One K-type thermocouple are supplied with the thermometer.
SAFETY INFORMATION
Itisrecommendedthatyoureadthesafetyandoperationinstructionsbefore
using the thermometer.
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.

2
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
Temperature Coefficient: 0.1 times the applicable accuracy specification
per°Cfrom0°Cto18°Cand28°Cto50°C(32°Fto64°Fand82°Fto122°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.

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.
3

4
2
1
3
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).

5
Cold Junction Temperature Display mode (second display)
Press C.J. TEMP key to display the thermocouple input connector cold
junction temperature on second display.
Press C.J. TEMP key again to exit this mode.
K/J T1 Input Thermocouple Type Select
The K/J key switch the thermocouple input selects the K-type or J-type
thermocouple as input.
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
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, K/J, C.J. TEMP and all Recall keys are disabled.
The beeper emits a tone when a new minimum or maximum value is
recorded.
Present temperature reading displayed on second display.
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"----.-".
4
5
6

6
7
Thetrueaverageofallthereadingtakenoveratleast22hourspreiodcan
be displayed. If 22 hours is exceeded, new averages are no longer
calculated. The last calcalated value is retained as the average reading,
but the actual minimum and maximum reading will continue to be
captured.
In the this mode, press HOLD key to stop the recording of readings, all
values are frozen, press again to restart recording.
To prevent accidental loss of MIN, MAX and AVG data, in this mode can
only be cancelled by pressing and hold down the MIN MAX key for 2
seconds to exit and erased recorded readings.
REL Relative mode
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. Present temperature reading displayed on second display.
Press REL key again to exit the relative mode.
Therelativevaluecanalsobeenteredbytheuser.(See"SETmode"later
in this manual.)
When the desired Relative value has been entered, press REL key to
enter 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
LCD is always the difference between the stored reference and the
present reading.

7
8
9
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.
SETmode(Relativevalueset,TimesetandHi/LoLimitsvalueset)
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.
Relative value is entered via overlay numbers, then press overlay ENTER
key, 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.

8
10
11
12
4.Whenthethermometeristurnedon.TheRelativesetvalueandHi/LoLimits
setvaluethat was in usewhenthermometerwas last turned offsetvalues.
Relative value Recall display mode.
PressRELRECALLkeytodisplaytheRelativesetvalueonseconddisplay.
Press REL RECALL key again to exit this mode.
Hi/Lo Limits value Recall display mode
PressHi/LoRECALLkeytodisplaytheHisetLimitvalueonseconddisplay.
PressHi/LoRECALLkeyagaintodisplaytheLoLimitssetvalueonsecond
display. Press Hi/Lo RECALL key again to exit this mode.
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.

9
OPERATOR MAINTENANCE
WARNING
To avoid possible electrical shock, disconnect the thermocouple
connectors from the thermometer before removing the cover.
Battery Replacement
Powerissuppliedbya9volt"transistor"battery.The" "appearsontheLCD
display when replacement is needed. To replace the battery, remove the two
screws from the back of the meter and lift off the battery cover. Remove the
battery from battery contacts.

10
CALIBRATION PROCEDURE
Note: The following calibration procedures should be performed only by
qualified technicians who have access to the following:
Equipment: The class of calibration should be 10 times greater than the
measured meter.
Step 1: Short the J3 with jumper.
Step 2: Apply 65 mV to the T1 input from Volts Calibrator and wait till the
reading becomes stable, then press the SET key until the display shows 0.1.
Step 3: Apply Type K 0°C to the input T2 and wait till the reading
becomes stable, then press the SET key until the meter shuts off by itself.
Step 4: Remove the jumper from J3.

11
NOTES:

12
NOTES:

FOR WARRANTY RETURNS, please have the following
information available BEFORE contacting OMEGA:
1. Purchase Order number under which the product was
PURCHASED,
2. Model and serial number of the product under warranty,
and
3. Repair instructions and/or specific problems relative to
the product.
FOR NON-WARRANTY REPAIRS, consult OMEGA for
current repair charges. Have the following information
available BEFORE contacting OMEGA:
1. Purchase Or de r number to cover the COST
of the repair,
2. Model and serial number of the product, and
3. Repair instructions and/or specific problems
relative to the product.
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customers the latest in technology and engineering. OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2008 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied, reproduced,
translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the prior written consent
of OMEGA ENGINEERING, INC.
WARRANTY / DISCLAIMER
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13
months from date of purchase. OMEGA’s WARRANTY adds an additional one (1) month grace period to the normal
one (1) year product warranty to cover handling and shipping time. This ensures that OMEGA’s customers receive
maximum coverage on each product.
If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service Department will
issue an Authorized Return (AR) number immediately upon phone or written request. Upon examination by OMEGA, if
the unit is found to be defective, it will be repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to
defects resulting from any action of the purchaser, including but not limited to mishandling, improper interfacing,
operation outside of design limits, improper repair, or unauthorized modification. This WARRANTY is VOID if the unit
shows evidence of having been tampered with or shows evidence of having been damaged as a result of excessive
corrosion; or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating
conditions outside of OMEGA’s control. Components in which wear is not warranted, include but are not limited to
contact points, fuses, and triacs.
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