Hanna Instruments HI 99551 User Manual
Instruction Manual
HI 99551 • HI 99556
Infrared Thermometers
for the Food Industry
www.hannainst.com
WARRANTY
HI 99551 and HI 99556 are warranted for two years against
defects in workmanship and materials when used for its intended purpose
and maintained according to instructions. Probes are guaranteed for
a period of six months.
This warranty is limited to repair or replacement free of charge. Damages
due to accident, misuse, tampering or lack of prescribed maintenance are
not covered. If service is required, contact the dealer from whom you
purchased the instrument. If under warranty, report the model number,
date of purchase, serial number and the nature of the failure. If the repair
is not covered by the warranty, you will be notified of the charges incurred. If the instrument is to be returned to Hanna Instruments, first
obtain a Returned Goods Authorization Number from the Customer Service department and then send it with shipment costs prepaid.
When shipping any instrument, make sure it is properly packaged for
complete protection.
All rights are reserved. Reproduction in whole or in part is prohibited
without the written consent of the copyright owner.
Hanna Instruments reserves the right to modify the design, construction
and appearance of its products without advance notice.
Dear Customer,
Thank you for choosing a Hanna product.
This manual will provide you with the necessary information
for the correct operation of the meter.
If you need additional technical information, do not hesitate
to e-mail us at tech@hannainst.com.
These instruments are in compliance with the directives.
PRELIMINARY EXAMINATION
Remove the instrument from the packing material and examine it carefully to make sure that no damage has occurred
during shipment. If there is any damage, notify your Dealer.
Each meter is supplied complete with:
• HI 765PW temperature probe (HI 99556 only)
• 9V battery
• instruction manual
Note: Conserve all packing material until the instrument has
been observed to function correctly. Any defective item
must be returned in its original packing.
GENERAL DESCRIPTION
HI 99551 and HI 99556 thermometers employ infrared technol-
ogy to measure the surface temperature.
Infrared measurements are extremely practical with a fast response time, typically around 1 second.
Another main advantage is the non-intrusive nature of the
measurement, which is particularly attractive in the food industry since it translates itself into substantial savings by leaving
products intact, especially those sealed or pre-wrapped. This type
of non-intrusive measurement is also useful when the surface
temperature is high, for difficult-to-reach places or due to hygiene requirements.
Simply point to the product or the spot and hold down the
measurement key. The measured value will be immediately displayed on the LCD.
If in addition to surface measurement, you must check the core
temperature too, then HI 99556 is the ideal solution: simply
attach the external probe to the meter and you will have a 2-in1 infrared-thermistor thermometer.
Different models are available, with different temperature ranges.
FUNCTIONAL DESCRIPTION
1. Infrared sensor
2. Temperature probe connector (HI 99556 only)
3. Liquid Crystal Display (LCD)
4. ON/OFF button
5. IR/CONTACT button to select infrared sensor or external
probe (HI 99556 only)
6. Wrist-strap
SPECIFICATIONS
HI 99551-00 HI 99551-01 HI 99551-10
HI 99556-00 HI 99556-01 HI 99556-10
Range IR Sensor
-10 to 300°C 14 to 572°F -20 to 199.9°C
Range Probe (HI 99556 only)
-40 a 150°C -40 a 302°F -40 to 150.0°C
Resolution IR Sensor
1°C 1°F 0.1°C
Resolutio Probe (HI 99556 only)
0.1°C 1°F 0.1°C
Accuracy IR Sensor
±2% of reading or ±2°C (-00 and -10 models);
±2% of reading or ±3°F (-01 models)
Accuracy Probe (HI 99556 only)
±0.5°C (-20 to 120°C) /±1°F (0 to 250°F);
±0.5°C / ±1°F +1% reading (outside)
Typical EMC Deviation IR Sensor
±1°C ±2°F ±1°C
Typical EMC Deviation Probe (HI 99556 only)
±0.5°C ±1°F ±0.5 °C
IR Sensor
Response Time 1 second
Optic Coefficient 3:1 (distance/target diameter)
Minimum Distance 30 mm (1.2’’)
Emissivity 0.95 (fixed)
Wave Length 6 a 14 µm
Probe HI 765PW (included) (HI 99556 only)
Battery Type 1 x 9V alkaline (IEC 6LR61)
Battery Life approx. 150 hours of continuous use
Environment 0 to 50°C (32 to 122°F);
RH max 95%
Dimensions 143 x 80 x 38 mm (5.6 x 3.2 x 1.5”)
Weight 320 g (11.3 oz.)
OPERATIONAL GUIDE
INFRARED SENSOR MEASUREMENT
Switch the instrument on.
For HI 99556 models, check that the
instrument is in IR (infrared) mode.
If necessary (a “P” tag appears on the LCD to indicate
“external probe mode”), press the IR/CONTACT button to
switch to IR (infrared) measurement mode.
To measure the temperature
of an object, simply aim the
sensor in the direction of the
object.
EMISSIVITY
The instruments measure the temperature of objects with an
emissivity of 0.95, which is the characteristic of most substances, such as organic material, water, plastic, fabrics, etc.
To measure substances that have a polished surface and are
very reflective, the emissivity needs to be compensated. It is
advisable to cover the object with black paint or black
adhesive tape to compensate for the reflectivity.
WARNING
To avoid damage, do not hold the sensor too close to a heat
source for a long period.
SENSOR CLEANING
To maintain the instrument’s accuracy, it is important that
the sensor lens is kept clean. To clean the sensor, gently wipe
the lens with a humid and non-abrasive cloth (HI 731318).
EXTERNAL PROBE (HI 99556 only)
Connect the HI 765PW tem-
perature probe to the connector
on top of the instrument.
ON
OFF
IR
CONTACT
BATTERY REPLACEMENT
Battery replacement must only take place in a safe area and
using a 9V alkaline battery.
Simply slide off the battery cover on the back of the meter,
detach the battery from the terminals and attach a new 9V
battery, while paying attention to the correct polarity. Replace the battery cover.
CE DECLARATION OF CONFORMITY
READING DISTANCE
The distance between the sensor and the object is an
important factor in infrared measurement.
The relation between “distance/object area” is 3:1. This
means that the diameter of the measured area is one third of
the distance between the sensor and the object.
For example, if the sensor is 15 cm away from the object, the
instrument measures the temperature of an area with a 5 cm
diameter.
MEASUREMENT MODE
Press the IR/CONTACT button to select the external probe
measurement mode: “P” appears on the LCD to indicate that
the mode has been entered.
Dip the probe in the substance which to be measured (an
immersion level of approximately 4 cm is recommended), and
wait for the reading to stabilize.
LOW BATTERY
These instruments continuously check the battery status. If the
battery level is too low to ensure realiable reading, the meter
shuts off the LCD completely. In this case and if the meter can
not be switched on, it is recommended to replace the battery
immediately.
ACCESSORIES
HI 710004 Soft carrying case
HI 710007 Blue shockproof rubber boot
HI 710008 Orange shockproof rubber boot
HI 721316 Rugged carrying case
HI 731318 Wiping tissue (4 pcs)
HI 740016 Battery cover
HI 740123 Wrist-strap
HI 765PW Penetration thermistor probe with white handle
Recommendations for Users
Before using these products, make sure that they are entirely suitable for the environment
in which they are used.
Operation of these instruments in residential area could cause unacceptable interference to
radio and TV equipment, requiring the operator to take all necessary steps to correct
interferences.
Any variation introduced by the user to the supplied equipment may degrade the instruments'
EMC performance.
To avoid damage or burns, do not perform any measurement in microwave ovens.
IST99556R3 07/05
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