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www.hannainst.com

Instruction Manual

HI99551 • HI99556

Infrared Thermometers 

for the Food Industry

Dear Customer,
Thank you for choosing a Hanna Instruments 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.

Remove the instrument from the packing material and ex-
amine it carefully to make sure that no damage has occurred 
during shipment. If there is any damage, contact your local  
Hanna Instruments Office.
Each meter is supplied complete with: 
 • 

HI765PW

 temperature probe (

HI99556

 only)

 

• 9V battery

 

• instruction manual

 

• quality certificate

Note: Conserve all packing material until the instrument 

has been observed to function correctly. Any defective item 

must be returned in its original packing. 

PRELIMINARY EXAMINATION

FUNCTIONAL DESCRIPTION

1. Infrared sensor
2. Temperature probe connector (

HI99556

 only)

3. Liquid Crystal Display (LCD)
4. ON/OFF button
5. IR/CONTACT button to select infrared sensor or external 

probe (

HI99556

 only)

6. Wrist-strap

GENERAL DESCRIPTION

HI99551

 and 

HI99556

 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 

HI99556

 is the ideal solution: simply 

attach the external probe to the meter and you will have a 2-in-1 
infrared-thermistor thermometer.
Different models are available, with different temperature ranges.

Hanna Instruments reserves the right to modify the design, 

construction and appearance of its products without advance notice.

SPECIFICATIONS

HI99551-00
HI99556-00

HI99551-01
HI99556-01

HI99551-10
HI99556-10

Range IR Sensor

-10 to 300 °C 14 to 572 °F -20 to 199.9 °C

Range Probe
(HI99556 only)

-40 a 150 °C -40 a 302 °C -40 to 150 °C

Resolution IR 
Sensor

1 °C

1 °F

0.1 °C

Resolution Probe 
(HI99556 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
(HI99556 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 
(HI99556 only)

±0.5 °C

±1 °F

±0.5 °C

IR Sensor
Response Time

1 second

Optic Coefficient

3:1 (ratio of distance to target diameter)

Minimum 
Distance

30 mm (1.2’’)

Emissivity

0.95 (fixed)

Wave Length

6 - 14 µm

Probe

HI765W (included) (HI99556 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%

Demensions

143 x 80 x 38 mm (5.6 x 3.2 x 1.5’’)

Weight

320 g (11.3 oz.)

Summary of Contents for Pronto Plus HI99551 Series

Page 1: ...www hannainst com Instruction Manual HI99551 HI99556 Infrared Thermometers for the Food Industry ...

Page 2: ...HI99551 and HI99556 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 esp...

Page 3: ...HI99556 only 3 Liquid Crystal Display LCD 4 ON OFF button 5 IR CONTACT button to select infrared sensor or external probe HI99556 only 6 Wrist strap Hanna Instruments reserves the right to modify the design construction and appearance of its products without advance notice ...

Page 4: ...Probe HI99556 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 HI99556 only 0 5 C 1 F 0 5 C IR Sensor Response Time 1 second Optic Coefficient 3 1 ratio of distance to target diameter Minimum Distance 30 mm 1 2 Emissivity 0 95 fixed Wave Length 6 14 µm Probe HI765W included HI99556 only Battery Type 1 x 9V alk...

Page 5: ...asure the temperature of an object simply aim the sensor in the direction of the object 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...

Page 6: ...or lens is kept clean To clean the sensor gently wipe the lens with a humid and non abrasive cloth HI731318 EXTERNAL PROBE HI99556 only Connect the HI765PW temperature probe to the connector on top of the instrument 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 substanc...

Page 7: ...minals and attach a new 9V battery while paying attention to the correct polarity Replace the battery cover ACCESSORIES HI710007 Blue shockproof rubber boot HI710008 Orange shockproof rubber boot HI731318 Wiping tissue 4 pcs HI765PW Penetration thermistor probe with white handle All rights are reserved Reproduction in whole or in part is prohibited without the written consent of the copyright owne...

Page 8: ...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 your local Hanna Instruments Office 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 wi...

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