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OMEGA
HH501AT
Digital Thermometer
INTRODUCTION
This instrument is a 3½ digit, compact-sized portable digital thermometer
designed to use external T-type thermocouples as temperature sensor.
Temperature indication follows Reference Temperature/Voltage Tables
(N.I.S.T. Monograph 175 Revised to ITS-90) for T-type thermocouples.
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.
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 operator must refer to an
explanation in this manual.
1
SPECIFICATIONS
ELECTRICAL
Temperature Scale: Celsius or Fahrenheit user-selectable.
Measurement Range:
-200°C to 400°C, -328°F to 752°F
Resolution: 0.1°C , 0.1°F
(-59.9°C to 199.9°C ,-59.9°F to 199.9°F)
1°C , 1°F on other range
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 thermocouple error.
±(0.1% rdg + 1.0°C) on -60°C to 400°C
±2.0°C on -60°C to -200°C
±(0.1% rdg + 2.0°F) on -76°F to 752°F
±4.0°F on -76°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.
Reading Rate: one time per second.
Input Connector: Accepts standard miniature thermocouple connectors (flat
blades spaced 7.9mm, center to center).
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: 3½ digit liquid crystal display (LCD) with maximum reading of 1999.
Overload: "-OL" 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
Power Switch
The key turns the thermometer on or off. In the MIN MAX record mode
can not power off, must leave MIN MAX record mode then power off.
1
2 5
°C °F Selecting the Temperature Scale
Readings is 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 or °F key.
3 " " Button
Press " " button to toggle on and off of backlight. The backlight will switch-
off automatically after 30 seconds.
4
HOLD Mode
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
6
MIN MAX record Mode
Press MIN MAX key to enter the MIN MAX Recording mode, (displays the
Maximum reading, Minimum reading, "MAX-MIN" reading and Average
reading stored in record mode). In the this mode the automatic power-off
feature is disabled and key and all function 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, MAX-MIN and AVG
readings.
If an overload is recorded, the averaging function is stopped and average
value display"-OL".
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,"MAX-MIN" 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.
7 8 9
TIMER STOP-WATCH Mode
Press TIMER STOP-W key to enter stop-watch mode stop-watch is
displayed. Press START/STOP key to toggle stop-watch starts and stops
(Time goes up to 19 minutes & 59.9 seconds). Press CLEAR key to display
0.1 second , then press again to zero the stop-watch.
Press TIMER STOP-W key again to exit the stop-watch mode.
5
10 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 >±2000.0 counts) shown on the
LCD is always the difference between the stored reference and the present
reading.
11
SET mode (Relative value 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
(the ".=" is displayed when you set up the fourth number).Relative value is
entered via overlay numbers, when you want to get negative values push
(- 0) key for end of numbers, then press overlay ENTER key, stored the
relative value, enter Hi/Lo Limits value set mode.
2. Hi Limit value set mode, (Press ENTER key can escape Hi Limit value
set mode), _ = = =.= is displayed (the ".=" is displayed when you set up the
fourth number), Hi Limit value is entered via overlay numbers, when you
want to get negative values push (- 0) key for end of numbers, then press
overlayENTERkey,storedthe HiLimitvalue,enterLoLimitvaluesetmode
6
(Press ENTER key can escape Lo Limit value set mode), _ = = =.= is
displayed(the".="isdisplayedwhenyousetupthefourthnumber), LoLimit
valueisenteredviaoverlaynumbers, whenyouwanttogetnegativevalues
push (- 0) key for end of numbers, then press overlay ENTER key, stored
the Lo Limit value and exit set mode.
3. In the SET mode, the value can not >±2000.0 counts.all value will be
memorized until yor reset it.
12
Hi/Lo LIMITS mode
Press Hi/Lo LIMITS key to enter the Hi/Lo Limits comparative mode,
"LIMIT" is displayed. In the this mode the automatic power-off feature is
disabled and other funtion key are disabled, when input temperature value
exceed Hi. The beeper emits a continuity pulse tone and "Hi" is displayed,
and when input temperature value exceed Lo value.The beeper emits a
discontinuous pulse tone and "Lo" is displayed. Press Hi/Lo LIMITS key
again to exit the Hi/Lo LIMITS mode.
7
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.
8
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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