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OMEGA
HH504
Digital Thermometer
INTRODUCTION
This instrument is a 4½ digit, compact-sized portable digital thermometer
designed to use external 100W Platinum RTD as temperature sensor. Tem-
peratureindicationfollowsReferenceTemperature/ResistanceTables(Pt385
for European Curve, Alpha=.00385 and Pt3926 for American Curve, Al-
pha=.003926).
SAFETY INFORMATION
Itisrecommendedthatyoureadthesafetyandoperationinstructionsbefore
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.
The symbol on the instrument indicates that the operator must refer to
an explanation in this manual.
1
SPECIFICATIONS
ELECTRICAL
Temperature Scale: Celsius or Fahrenheit user-selectable.
Measurement Range:
Pt385(100W ) -200°C to 800°C, (-328°F to 1472°F)
Pt3926(100W ) -200°C to 630°C, (-328°F to 1166°F)
Resolution: 0.1°C or 0.2°F
Accuracy: Accuracy is specified for operating temperatures over the range of
18°C to 28°C (64°F to 82°F), for 1 year, not including RTD probe error.
±(0.05% rdg + 0.2°C) on °C scale
±(0.05% rdg + 0.4°F) on °F scale
Temperature Coefficient: 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 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: MTP miniature RTD 3 prong connector.
2
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:4½ digit liquid crystal display (LCD) with maximum reading of 19999.
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
OPERATING INSTRUCTIONS
1
2
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 (Main display)
Reading the main 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.
3
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.
Pressing the HOLD key again to cancel HOLD mode causing 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).
4
4
T1/ T2/T1-T2 Main display Input Selection
The input selection indicates which input is selected for main display; T1
probe,T2probeorthedifferencebetweenthetwoprobes(T1-T2),whenthe
thermometer is turned on, it is set to T1.
When main display input selected T1, then T1 input can select alternate of
probe by pressing Pt385/Pt3926 key switch.
5
6
Pt385/Pt3926 T1 Input RTD Probe Select (Main display)
The Pt385/Pt3926 key switch the T1 input selects the Pt385 or Pt3926 RTD
probe as input, when main display input selected T1.
When the thermometer is turned on, it is set to the probe 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
feature is disabled and
key, °C/°F key, REL key, SET key, Hi/Lo Limits
key and main display T1 T2 T1-T2 key, Pt385/Pt3926 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"----.-".
5
The true average of all the reading taken over at least 22 hours preiod can
be displayed. If 22 hours is exceeded, new averages are no longer
calculated. Thelastcalcalatedvalueisretainedastheaveragereading, 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.
TopreventaccidentallossofMIN,MAXandAVGdata,inthismodecanonly
be cancelled by pressing and hold down the MIN MAX key for 2 seconds to
exit and erased recorded readings.
7 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.)
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.
6
8
9
°C/°F Selecting the Temperature Scale (Second display)
Readings the second 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.
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.
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)
=.= = = : = = is displayed in second and third display. Time (hours, minutes,
seconds) value is entered via overlay numbers, then press overlay ENTER
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.
7
4. When the thermometer is turned on. The Relative set value and Hi/Lo Limits
set value that was in use when thermometer was last turned off set values.
10
T1/T2 /T1-T2 second display Input Selection
The input selection indicates which input is selected for second display; T1
probe,T2probeorthedifferencebetweenthetwoprobes(T1-T2),whenthe
thermometer is turn on, it is set to T2 input can select alternate of probe by
second display Pt385/Pt3926 key switch.
11 Pt385/Pt3926 Input RTD Prob select (second display)
The Pt385/Pt3926 key switch the T2 input selects the Pt385 or Pt3926 RTD
probe as input, when second display input selected T2.
When the thermometer is turned on, it is set to the RTD selected that was
in use when the thermometer was last turned off.
12
Hi/Lo Limits mode (only Main display)
Press Hi/Lo LIMITS key to enter the Hi/Lo Limits comparative mode, when
input temperature value exceed Hi or Lo Limits value. The beeper emits a
continuitypulsetone. PressHi/LoLIMITSkeyagaintoexittheHi/LoLIMITS
mode.
8
OPERATOR MAINTENANCE
WARNING
To avoid possible electrical shock, disconnect the thermocouple
connectors from the rmometer 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.
RTD PROBE CONNECTION
P/N : 17650-0505
RW1
+
G
+
-
RTD
100W
RW2
RW3
-
G
Pt385
(Pt3926)
RW1=RW2=RW3
RW= WIRE RESISTANCE
9
TEMPERATURE VS RESISTANCE TABLE(ITS90)
°C
-200°C
-100°C
0°C
Pt385
18.521W
Pt3926
16.996W
59.479W
100.000W
139.272W
177.362W
214.275W
250.018W
284.591W
317.994W
-
60.256W
100.000W
138.505W
175.856W
212.052W
247.092W
280.977W
313.708W
345.280W
375.700W
100°C
200°C
300°C
400°C
500°C
600°C
700°C
800°C
-
10
HH 504 / HH 505 CALIBRATION PROCEDURE
Note: The following calibration procedure should perform only by qualified technicians
who have access to the items as following.
Equipment: The class of calibrator had better 10 times greater than the measured meter.
1. Turn off the meter then set the adjusted jumper to J1.
2. Insert the 383.00Ω calibrator to the T1 then turn on the meter, the main
display reading reads 1830.0 then press " ENTER " key.
3. The second display is stabilized (about 5sec.), then press " ENTER " key
when the meter auto power off then set the jumper back to J3 position.
4. Turn on the meter then Insert the 100.00Ω calibrator. The display reading
reads 0°C if the calibration procedure is right.
383.00ꢀꢁCALIBRATOR
RW1
RW2
RW3
+
RW1=RW2=RW3
_
RW=WIRERESISTANCE
G
+
_
383.00ꢀ
G
Pt385
Pt3926
℃
-200℃
-100℃
0℃
18.521Ω
60.256Ω
100.000Ω
138.505Ω
175.856Ω
212.052Ω
247.092Ω
280.977Ω
313.708Ω
345.280Ω
375.700Ω
16.996Ω
59.479Ω
100.000Ω
139.272Ω
177.362Ω
214.275Ω
250.018Ω
284.591Ω
317.994Ω
―
100℃
200℃
300℃
400℃
500℃
600℃
700℃
800℃
―
1
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 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 should malfunction, 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 isVOID if the unit shows evidence of having been tampered with or shows evidence
of being 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 which wear are not warranted, including but not
limited to contact points, fuses, and triacs.
OMEGA is pleased to offer suggestions on the use of its various products.However,OMEGA neither assumes responsibility
for any omissions or errors nor assumes liability for any damages that result from the use of its products in accordance
with information provided by OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by it
will be as specified and free of defects. OMEGA MAKES NO OTHERWARRANTIES OR REPRESENTATIONS OF ANY KIND
WHATSOEVER, EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE AND ALL IMPLIED WARRANTIES INCLUDING ANY
WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED.
LIMITATION OF LIABILITY:The remedies of purchaser set forth herein are exclusive and the total liability of OMEGA with
respect to this order, whether based on contract, warranty, negligence, indemnification, strict liability or otherwise, shall
not exceed the purchase price of the component upon which liability is based. In no event shall OMEGA be liable for
consequential, incidental or special damages.
CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a "Basic Component" under 10
CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical applications or used on humans. Should any
Product(s) be used in or with any nuclear installation or activity, medical application, used on humans, or misused in any way,
OMEGA assumes no responsibility as set forth in our basic WARRANTY / DISCLAIMER language, and additionally, purchaser will
indemnify OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the Product(s) in
such a manner.
RETURN REQUESTS / INQUIRIES
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURNING ANY
PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA'S
CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then
be marked on the outside of the return package and on any correspondence.
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent breakage in transit.
FOR WARRANTY RETURNS, please have the following
information available BEFORE contacting OMEGA:
1. P.O. number under which the product was PURCHASED.
FOR NON-WARRANTY REPAIRS, consult OMEGA for
current repair charges. Have the following information
available BEFORE contacting OMEGA:
2. Model and serial number of the product under warranty, and 1. P.O. number to cover the COST of the repair.
3. Repair instructions and/or specific problems relative to the
product.
2. Model and serial number of product , and
3. Repair instructions and/or specific problems relative to the
product.
OMEGA's policy is to make running changes, not model changes, whenever an improvement is possible. This affords our customers the latest
in technology and engineering. OMEGA is a registered trademark of OMEGA ENGINEERING, INC. © Copyright 1999 OMEGA ENGINEERING,
INC. All rights reserved. This document may not be copied, photocopied, reproduced, translated, or reduced to any electronic medium or
machine-readable from, in whole or in part, without prior written consent of OMEGA ENGINEERING, INC.
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