Hanna Instruments HI 93551 User manual

Instruction Manual
HI93551 • HI93551N
HI93551R
HI93542 • HI93552
HI93552R
K J T - Thermometers
www.hannainst.com

2
TABLE OF CONTENTS
Preliminary Examination............................................................... 3
General Description ....................................................................... 3
Specifications of HI93551 and HI93551N ..................................... 4
Specifications of HI93542 and HI93552 ....................................... 6
Specifications of HI93551R and HI93552R................................... 8
Operational Guide ..................................................................... 10
Serial Port Communication ......................................................... 15
User Calibration ......................................................................... 16
Factory Recalibration .................................................................. 16
Battery Replacement .................................................................. 17
Accessories .................................................................................. 18
Dear Customer,
Thank you for choosing a Hanna Instruments product.
Pleasereadthisinstructionmanualcarefullybeforeusingthisinstrument.
For more information about Hanna Instruments and our products, visit
www.hannainst.com or e-mail us at [email protected].
For technical support, contact your local Hanna Instruments Office or
e-mail us at [email protected].
WARRANTY
HI93551, HI93551N, HI93542, HI93552, HI93551R ans HI93552R
are guaranteed for two years against defects in workmanship and
materials when used for their intended purpose and maintained
according to instructions. Electrodes and probes are guaranteed for six
months. This warranty is limited to repair or replacement free of
charge. Damage due to accidents, misuse, tampering or lack of
prescribed maintenance is 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 problem. If the repair is not covered by
thewarranty,youwillbenotifiedofthechargesincurred.Iftheinstrument
is to be returned to Hanna Instruments, first obtain a Returned Goods
Authorization number from the Technical Service department and then
senditwithshippingcostsprepaid.Whenshippinganyinstrument,make
sure it is properly packed for complete protection.

3
PRELIMINARY EXAMINATION
Remove the instrument from the packing material and examine it
carefully to make sure that no damage has occurred during shipping.
If there is any damage, please contact your local Hanna Instruments
Office.PC
Each instrument is supplied with:
• 3 x 1.5V AA alkaline batteries
• Instruction manual.
Note: Save all packing material until you are sure that the
instrument functions correctly. All defective items must be
returned in the original packing with the supplied accessories.
GENERAL DESCRIPTION
These instruments are powerful and flexible thermometers, which can
take measurements using different types of thermocouple probes (K, J
and T), and have been designed using the latest microprocessor
technology to provide reliable and accurate high resolution measure-
ments in a wide temperature reange.
Standard features include dual-level LCD (which allows continuous
displaying of High and Low temperature values), °C/°F selection,
HOLD function, auto-off capability, remaining battery life indication,
low battery detection, long battery life and two-year warranty.
HI93542, HI93552 and HI93552R are two-channel thermometers,
ideal for monitoring two samples at once.
HI93551N, HI93551R, HI93552 and HI93552R offer additional
features, such as calibration of meter and probe at 0°C, backlit
display, and capability to store and recall a reading.
Moreover, the HI93551R and HI93552R models are equipped with a
serial port interface.
All rights are reserved. Reproduction in whole or in part is prohibited without the
written consent of the copyright owner, Hanna Instruments Inc.
Hanna Instruments reserves the right to modify the design, construction or
appearance of its products without advance notice.

4
SPECIFICATIONS OF
HI93551 & HI93551N
SPECIFICATIONS
Range (*) K -200.0 to 999.9°C / 1000 to 1371°C
-328.0 to 999.9°F / 1000 to 2500°F
J-200.0 to 999.9°C
-328.0 to 999.9°F / 1000 to 1832°F
T-200.0 to 400.0°C
-328.0 to 752.0°F
Resolution K 0.1°C (-149.9 to 999.9°C)
0.2°C (-200.0 to -150.0°C) / 1°C (1000 to 1371°C)
0.1°F (-24.9 to 999.9°F) / 0.2°F (-249.9 to -25.0°F)
0.3°F (-328.0 to -250.0°F) / 1°F (1000 to 2500°F)
J0.1°C (-200.0 to 999.9°C)
0.1°F (-149.9 to 999.9°F)
0.2°F (-328.0 to -150.0°F) / 1°F (1000 to 1832°F)
T0.1°C (-149.9 to 400.0°C)
0.2°C (-200.0 to -150.0°C)
0.1°F (0.0 to 752.0°F) / 0.2°F (-270.0 to -0.1°F)
0.3°F (-328.0 to -270.1°F)
Accuracy ±0.5°C (-100.0 to 999.9°C) / ±1°C (outside)
(@20°C/68°F) ±1°F (-148.0 to 999.9°F) / ±1.5°F (outside)
for one year, excluding probe error
Battery 3x1.5V AA (IEC LR6) batteries,
approx. 500 hours of continuous use
Auto-off user selectable: 60 min or disabled
Environment -10 to 60°C (14 to 140°F); RH 100%
Dimensions 150 x 80 x 36 mm (5.9 x 3.1 x 1.4")
Weight 235 g (8.3 oz.)
(*) Range may be limited by probe.

5
HI93551 HI93551N
Keyboard Functions:
ON/OFF : turn the meter ON and OFF.
HOLD : freeze the reading on display.
°C/°F : change reading unit (°C or °F).
KJT : select the thermocouple type.
CLR : clear the HI and LO values.
CAL (HI93551N only) : press and hold for about 5 seconds to
enter the Calibration mode (with reading within ±3°C
range); press to abort the Calibration mode.

6
SPECIFICATIONS OF
HI93542 & HI93552
SPECIFICATIONS
Range (*) K -200.0 to 999.9°C / 1000 to 1371°C
-328.0 to 999.9°F / 1000 to 2500°F
J-200.0 to 999.9°C
-328.0 to 999.9°F / 1000 to 1832°F
T-200.0 to 400.0°C
-328.0 to 752.0°F
Resolution K 0.1°C (-149.9 to 999.9°C)
0.2°C (-200.0 to -150.0°C) / 1°C (1000 to 1371°C)
0.1°F (-24.9 to 999.9°F) / 0.2°F (-249.9 to -25.0°F)
0.3°F (-328.0 to -250.0°F) / 1°F (1000 to 2500°F)
J0.1°C (-200.0 to 999.9°C)
0.1°F (-149.9 to 999.9°F)
0.2°F (-328.0 to -150.0°F) / 1°F (1000 to 1832°F)
T0.1°C (-149.9 to 400.0°C)
0.2°C (-200.0 to -150.0°C)
0.1°F (0.0 to 752.0°F) / 0.2°F (-270.0 to -0.1°F)
0.3°F (-328.0 to -270.1°F)
Accuracy ±0.5°C (-100.0 to 999.9°C) / ±1°C (outside)
(@20°C/68°F) ±1°F (-148.0 to 999.9°F) / ±1.5°F (outside)
for one year, excluding probe error
Battery 3x1.5V AA (IEC LR6) batteries,
approx. 500 hours of continuous use (BL off)
Auto-off user selectable: 60 min or disabled (HI 93542)
user selectable: 8 min, 60 min, disabled (HI 93552)
Environment -10 to 60°C (14 to 140°F); RH 100%
Dimensions 150 x 80 x 36 mm (5.9 x 3.1 x 1.4")
Weight 235 g (8.3 oz.)
(*) Range may be limited by probe.

7
HI93542 HI93552
Keyboard Functions:
ON/OFF : turn the meter ON and OFF.
T1/T2 : select the reading channel (T1, T2 or T1-T2).
HOLD : freeze the reading on display. In HI93552, the frozen value
is also stored in non-volatile memory.
CLR : clear the HI and LO values, reset the relative or average
measurement.
DISP : select Normal, Relative, Average or T1/T2 measuring mode.
KJT : select the thermocouple type.
ALT (HI93552 only) : enable the second function keys; the "ALT" tag
turns on to indicate that the second functions are enabled.
Note: The ALT key can be released before pressing the second
function key for 1-hand operation.
ALT/uCAL : press and hold for about 5 seconds to enter the
Calibration mode (with reading within ±3°C range).
(ALT +) AOFF : set auto-off delay (8min, 60min, disabled).
(ALT +) °C/°F : change reading units (°C or °F).
(ALT +) MR : recall memorized value.
(ALT +) KJT : select the thermocouple type.
(ALT +) BL : toggle the backlight ON and OFF.

8
SPECIFICATIONS OF
HI93551R & HI93552R
SPECIFICATIONS
Range (*) K -200.0 to 999.9°C / 1000 to 1371°C
-328.0 to 999.9°F / 1000 to 2500°F
J-200.0 to 999.9°C
-328.0 to 999.9°F / 1000 to 1832°F
T-200.0 to 400.0°C
-328.0 to 752.0°F
Resolution K 0.1°C (-149.9 to 999.9°C)
0.2°C (-200.0 to -150.0°C) / 1°C (1000 to 1371°C)
0.1°F (-24.9 to 999.9°F) / 0.2°F (-249.9 to -25.0°F)
0.3°F (-328.0 to -250.0°F) / 1°F (1000 to 2500°F)
J0.1°C (-200.0 to 999.9°C)
0.1°F (-149.9 to 999.9°F)
0.2°F (-328.0 to -150.0°F) / 1°F (1000 to 1832°F)
T0.1°C (-149.9 to 400.0°C)
0.2°C (-200.0 to -150.0°C)
0.1°F (0.0 to 752.0°F) / 0.2°F (-270.0 to -0.1°F)
0.3°F (-328.0 to -270.1°F)
Accuracy ±0.5°C (-100.0 to 999.9°C) / ±1°C (outside)
(@20°C/68°F) ±1°F (-148.0 to 999.9°F) / ±1.5°F (outside)
for one year, excluding probe error
Battery 3x1.5V AA (IEC LR6) batteries,
approx. 500 hours of continuous use (BL off)
Auto-off user selectable: 8 min, 60 min, disabled
Serial Port unidirectional, 8-bit data, 1200 baud
Communication (see "Serial Communication" section)
Environment -10 to 60°C (14 to 140°F); RH 100%
Dimensions 150 x 80 x 36 mm (5.9 x 3.1 x 1.4")
Weight 235 g (8.3 oz.)
(*) Range may be limited by probe.

9
HI93551R HI93552R
Keyboard Functions:
ON/OFF : turn the meter ON and OFF.
T1/T2 : select the reading channel (T1, T2 or T1-T2).
HOLD : freeze the reading on display. The frozen value is also stored
in non-volatile memory.
CLR : clear the HI and LO values, reset the relative or average
measurement.
DISP : select Normal, Relative, Average or T1/T2 measuring mode.
ALT : enable the second function keys; the "ALT" tag turns on to
indicate that the second functions are enabled.
Note: The ALT key can be released before pressing the second
function key for 1-hand operation.
ALT/uCAL : press and hold for about 5 seconds to enter the
Calibration mode (with reading within ±3°C range).
(ALT +) AOFF : set auto-off delay (8 min, 60 min, disabled).
(ALT +) °C/°F : change reading units (°C or °F).
(ALT +) MR : recall memorized value.
(ALT +) KJT : select the thermocouple type.
(ALT +) BL : toggle the backlight ON and OFF.

10
OPERATIONAL GUIDE
To switch the instrument ON, press the ON/OFF key.
The thermometer will carry out a self diagnostic test routine, the LCD will
show all segments for a few seconds (or as long as ON/OFF is held),
followed by the percentage indication of the remaining battery life.
The thermometer then enters normal measurement mode.
If a temperature probe is plugged in, the meter displays the
measured temperature.
If no probe is plugged in, or if the reading is
over-range, the display shows flashing dashes.
If a measurement is slightly over the range of
the meter specifications, the display will flash
the closest full-scale value.
To switch the meter OFF, press the ON/OFF key.
Note: The meters are provided with an acoustic signal feature activated
when buttons are pressed, which can be disabled using a switch
located in the battery compartment (see figure on page 10).
°C/°F SELECTION
Measurements can be displayed in either degrees Celsius or Fahren-
heit. The meter is factory set to °C scale; to change the scale, press
°C/°F key (HI93551, HI93551N and HI93551R) or (ALT+)°C/°F
keys (HI93552 and HI93552R), or set the switch located in the battery
compartment (HI93542, see figure on page 10).
THERMOCOUPLE TYPE SELECTION, KJT
By pressing KJT (HI93551, HI93551N and HI93542) or (ALT+)KJT
keys (HI93551R, HI93552 and HI93552R), the thermometer is set
according to the connected thermocouple type. The corresponding
symbol will be displayed, i.e. K for K-type, J for J-type, T for T-type.
Note: Changing thermocouple type resets the HI and LO values.

11
HOLD and MR FUNCTIONS
The HOLD function is activated by press-
ing the HOLD key.
The measured temperature is held on the
display until HOLD is pressed again. The
"HOLD" tag blinks on the display while in
HOLD mode.
Note: Although the display is frozen, internally the meter continues
measuring and updating Hi/Lo, relative and average values.
In HI93551R, HI93552 and HI93552R, the held value is also stored
in non-volatile memory and can be recalled by pressing (ALT+) MR
keys. While the MR key is held, the "HOLD" tag lights up and the
meter displays the stored value; when the MR key is released, after 1
second the meter returns to normal measurement mode.
HIGH/LOW TEMPERATURES
The maximum and minimum tempera-
tures are continuously monitored and
displayed on the lower portion of the LCD.
Note: When the reading goes over-range or the probe is removed,
the Hi and Lo values display dashes until cleared.
CLEAR FUNCTION
Upon pressing the CLR key, the High/Low
values may be cleared at any time dur-
ing measurement and the current reading
is assigned to the highest and lowest
temperature values for the displayed chan-
nel only.
In HI93551R, HI93542, HI93552 and HI93552R models, pressing
CLR also resets relative and average values.
AUTO SHUT-OFF
To save battery life, the meters are provided with an auto-off feature,
which switches the meter off after 60 minutes of nonuse.
In HI93551, HI93551N and HI93542 models, to disable this feature
set the internal slide-switch located in the battery compartment (see
figure on page 10).

12
The HI93551R, HI93552 and HI93552R allow the user to select the
auto-off time period through the front keyboard; press (ALT+) AOFF to
enter the mode, then set the desired auto shut-off interval (8 min, 60
min, or disabled) with the ALT key; release all buttons, wait a few
seconds and the meter will return to normal measurement mode.
BACKLIGHT FEATURE
The HI93551R, HI93552 and HI93552R mod-
els are provided with a backlight feature, which
can be easily activated through the keyboard by
pressing the (ALT+)BL keys.
Note: The backlight automatically shuts off after approximately 1
minute with no buttons pressed.
BATTERY COMPARTMENT
See "Battery replacement" section for back cover removal/installation.

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2-CHANNEL MODELS (HI93542, HI93552 & HI93552R)
HI93542, HI93552 and HI93552R models can monitor two samples
through two independent temperature channels (probes).
The display shows the actual, Hi and Lo (or T1 and T2) values of the
selected channel (T1, T2 or T1-T2). The corresponding tags light up to
inform the user.
To select the desired channel, use the T1/T2 key.
The 2-channel and HI93551R models are also provided with the
DISP function, which allows the user to select the information to be
displayed.
•While in T1 or T2, pressing DISP switches the display between
normal, relative and average measurement modes.
In the normal mode, the main body of the LCD shows the
current temperature while the lower portion displays the Hi/Lo
limits for that channel.
When the meter enters relative mode, the "REL" tag
lights up and the current temperature for that channel is set as
the reference temperature. Pressing CLR will also set the reference
to the current temperature.
In relative mode, the main body of the LCD shows the difference
from the reference temperature. The lower portion displays the
current temperature for the selected channel.
When average mode is entered, the "AVG" tag lights up
and the current value is set as the new beginning value. The
average can be reset by pressing CLR while in the average mode.
In average mode, the main body of the LCD shows the average
temperature, while the lower portion displays the current tem-
perature for the selected channel.

14
The average mode will calculate the average for a period of up to
24 hours. If a different mode is selected for that channel, the
average will no longer calculate and the value will be lost.
At the end of the 24 hour period, the "AVG" tag will blink to
indicate that sampling has stopped, and the displayed value is
the last average calculated.
If a probe is removed or over-range is reached while in average
mode, the display shows flashing dashes and blinking "AVG" tag.
The average value is lost and will not restore even if the condition
restores. To start the average cycle again, either press CLR or re-
enter the average mode.
•While in T1-T2 (not for HI93551R), pressing DISP will switch
between 4 displays:
Note: Pressing T1/T2 to change the channel will not alter the
information chosen to be displayed for each channel (DISP).
For example, if T1 is in average mode, the average will continue
to be calculated even if the user press T1/T2 to see T2.
Note: Relative/average modes cannot be entered if dashes are shown
in the main portion of the LCD.
Note: The auto-off time is disabled whenever a channel is set to
average mode.

15
SERIAL PORT COMMUNICATION
(HI93551R & HI93552R only)
HI93551R and HI93552R feature an RS232 output for transferring
measurement data (once every second for HI93551R and once every
2 seconds for HI93552R) to devices provided with RS232 input (PC
or printer).
The communication protocol has been designed to transmit to the
receiving unit all the displayed information.
The communication is unidirectional (meter to receiving unit only)
and the transmissions consist in a 32-character ASCII string, compatible
with our optional HI92000 software.
To allow our users access to the latest version of Hanna Instruments PC
compatible software, we made the products available for download at
http://software.hannainst.com. Select the product code and click
Download Now. After download is complete, use the setup.exe file to
install the software.
The 32-character data string is structured as follows:
Main portion of the LCD
• byte 0 probe type: K-thermocouple (k)
• bytes 1, 2 measurement channel: T1, T2, T1-T2 (Td)
• byte 3 measurement mode: Normal (blank), Relative (R),
Average (A), Average done (a)
• byte 4 operating mode: Hold (H), Memory recall (M)
• byte 5 blank character
• bytes 6-10 measurement: reading (XXX.X or blank XXXX),
over-range (OVRG blank), no data (blank ----)
• byte 11 temperature unit: C, F
• byte 12 blank character
Secondary LCD, left portion
• bytes 13, 14 info description: low temperature (Lo), T1 (T1)
• byte 15 blank character
• bytes 16-20 measurement: reading (XXX.X or blank XXXX),
over-range (5 blanks), no data (blank ----)
• byte 21 blank character
Secondary LCD, right portion
• bytes 22, 23 info description: high temperature (Hi), T2 (T2)
• byte 24 blank character
• bytes 25-29 measurement: reading (XXX.X or blank XXXX),
over-range (5 blanks), no data (blank ----)
• byte 30 <CR>
• byte 31 line feed

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USER CALIBRATION
The HI93551N, HI93551R, HI93552 and HI93552R models can be
calibrated at 0°C by using an ice bath.
•Prepare an ice bath with approximately equal volumes of distilled
water and chopped ice made from distilled water.
•Immerse the temperature probe in the center of the ice bath,
taking care not to touch the ice with the probe tip.
•Ensure that the meter is measuring a temperature within ±3°C.
•To enter the Calibration mode, press and hold the CAL button for
about 5 seconds.
•The CAL tag turns on to indicate that
the Calibration mode has been entered.
Note: If the measurement is outside the
±3°C window, the meter does not
enter Calibration mode.
•When the meter reaches the stability condition, which is detected
when the measurement remains within ±0.2°C for 5 seconds,
the calibration is accepted and the reading becomes 0°C (32°F).
•The meter then automatically returns to normal mode.
Note: To exit the Calibration mode at any time, press the CAL key.
Note: User calibration cannot be entered in relative, average or in
T1-T2 mode.
Note: User calibration is only performed on the current channel
displayed (T1 or T2).
FACTORY RECALIBRATION
All Hanna thermometers have been accurately pre-calibrated at the
factory.
It is generally recommended to have all thermometers recalibrated at
least once a year.
For an accurate recalibration, contact your nearest Hanna Customer
Service Center.

17
When the battery level is below 5%, a warning
symbol will blink on the LCD to indicate a low
battery condition.
If the battery level is low enough to cause erroneous readings, the
Battery Error Prevention System (BEPS) turns the meter off.
Immediately replace the batteries with new ones.
The batteries are accessed by separating the front and the back
halves of the meter: unscrew the 4 screws on the back of the meter
and carefully replace the three batteries located in the battery
compartment, while paying attention to their polarity. Reattach the
back making sure that the gasket is in place and tighten the 4
screws to ensure a watertight seal.
Battery replacement must only take place in a non-hazardous area
using 1.5V AA (IEC LR6) alkaline batteries.
BATTERY REPLACEMENT
Note: To clean the meters, do not use aggressive detergents. It is
recommended to use water.
Recommendations for Users
Beforeusingthisproduct,makesureitisentirelysuitablefor yourspecific
application and for the environment in which it is used. Any variation
introduced by the user to the supplied equipment may degrade the
meter’sperformance. For yoursand the meter’ssafety do notuse or store
the meter in hazardous environments.

18
ACCESSORIES
K-TYPE THERMOCOUPLE PROBES
with integral handle, 1 m (3.3') cable & mini-connector:
HI766A Roller surface probe, max 320°C/600°F
HI766B Surface probe, max 650°C/1200°F
HI766B1 90º Surface probe, max 450°C/840°F
HI766B2 Spring-loaded,surface probe, max 900°C/1650°F
HI766B3 Spring-loaded, small surface probe with
insulated shaft, max 200°C/390°F
HI766C Penetration probe, max 900°C/1650°F
HI766C1 Ultra-fast penetration probe, max 300°C/570°F
HI766D Air probe, max 300°C/570°F
HI766E1 General purpose probe, max 900°C/1650°F
HI766E2 General purpose probe, max 900°C/1650°F
HI766F High temperature, flexible wire probe
without handle, max 1100°C/2000°F
HI766F1 Flexible wire probe w/o handle, max 480°C/ 900°F
HI766TR1 Penetration probe, max 250°C/482°F
HI766TR2 Penetration long probe, max 250°C/482°F
HI766TV1 Pipe clamp probe, max 200°C/390°F
with detachable handle & mini-connector (to be used in
conjunction with the HI 766HD probe handle)::
::
:
HI766PA Roller surface probe, max 320°C/600°F
HI766PB Surface probe, max 650°C/1200°F
HI766PC Penetration probe, max 900°C/1650°F
HI 66PD Air probe, max 300°C/570°F
HI766PE1 General purpose probe, max 900°C/1650°F
HI766PE2 General purpose probe, max 900°C/1650°F
grill surface probe:
HI766B4 Grill surface probe with 70 cm (27.6’’) cable
(protected with stainless steel jacket),
max 250°C/482°F
HI7664B4S Spare stainless steel sensor for HI766B4 probe

19
OTHER ACCESSORIES
HI710007 Shockproof rubber boot, blue
HI710008 Shockproof rubber boot, orange
HI710018 Spare protective case
HI710031 RUGGED carrying case
HI766EX Extension cable for K-type probes
HI766HD Rugged thermocouple probe handle with
1m (3.3') cable fitted with mini-connector
HI920011 Serial cable for PC connection
CERTIFICATION
All Hanna Instruments conform to the CE European Directives.
DisposalofElectrical& ElectronicEquipment.Theproduct
should not be treated as household waste.
Instead hand it over to the appropriate collection point for the
recycling of electrical and electronic equipment which will
conserve natural resources.
Disposalofwaste batteries. This product contains batteries,
do not dispose of them with other household waste. Hand them over to
the appropriate collection point for recycling.
Ensuringproperproductandbatterydisposal preventspotentialnegative
consequences for the environment and human health. For more
information,contactyourcity,yourlocalhouseholdwastedisposalservice,
the place of purchase or go to www.hannainst.com.

20
MANKJT 06/19
WorldHeadquarters
Hanna Instruments Inc.
Highland Industrial Park
584 Park East Drive
Woonsocket,RI02895USA
www.hannainst.com
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