Hanna Instruments HI 93542 User Manual

Instruction Manual

HI 93551 • HI 93551N

HI 93551R

HI 93542 • HI 93552

HI 93552R

K J T - Thermometers

www.hannainst.com

Dear Customer,
Thank you for choosing a Hanna product.
Please read this instruction manual carefully before using the instru-

ment.
If you need additional technical information, do not hesitate to e-mail

us at [e-mail].
These instruments are in compliance with the directives.

WARRANTY

All Hanna Instruments meters are warranted for two years against defects
in workmanship and materials when used for their intended purpose and main­tained according to instructions. The probes are warranted for a period of
six months.

This warranty is limited to repair or replacement free of charge. Damages due to
accidents, 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. First obtain a Returned Goods Authoriza­tion number from the Customer Service department, then return the instrument
with the Authorization number included along with shipment costs prepaid. If the
repair is not covered by the warranty, you will be notified of the charges. When
shipping any instrument, make sure it is properly packaged for complete protec­tion.

TABLE OF CONTENTS

Preliminary Examination ...............................................................3

General Description .......................................................................3

Specifications of HI 93551 and HI 93551N.................................. 4

Specifications of HI 93542 and HI 93552 ....................................6

Specifications of HI 93551R and HI 93552R ................................8

Operational Guide .....................................................................10

Serial Port Communication ......................................................... 15

User Calibration ......................................................................... 16

Factory Recalibration .................................................................. 16

Battery Replacement ..................................................................17

Accessories .................................................................................. 18

PRELIMINARY EXAMINATION

Remove the instrument from the packing material and examine it to
make sure that no damage has occurred during shipping. If there is
any damage, notify your dealer or the nearest Hanna Customer
Service Center.

Each meter is supplied complete 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 measure­ments 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.

HI 93542, HI 93552 and HI 93552R are two-channel thermometers,
ideal for monitoring two samples at once.

HI 93551N, HI 93551R, HI 93552 and HI 93552R 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 HI 93551R and HI 93552R 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 and

appearance of its products without advance notice.

32

SPECIFICATIONS OF

HI 93551 & HI 93551N

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)

J 0.1°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)

T 0.1°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

Typical EMC Deviation ± 3°C / ± 6°F
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.

HI 93551 HI 93551N

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 (HI 93551N 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.

54

SPECIFICATIONS OF

HI 93542 & HI 93552

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)

J 0.1°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)

T 0.1°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

Typical EMC Deviation ± 3°C / ± 6°F
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.

HI 93542 HI 93552

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 HI 93552, 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 (HI 93552 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/ CAL : 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.

76

SPECIFICATIONS OF

HI 93551R & HI 93552R

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)

J 0.1°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)

T 0.1°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

Typical EMC Deviation ± 3°C / ± 6°F
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.

HI 93551R HI 93552R

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/ CAL : 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.

98

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 Fahren­heit. The meter is factory set to °C scale; to change the scale, press
°C/°F key (HI 93551, HI 93551N and HI 93551R) or (ALT+)°C/°F
keys (HI 93552 and HI 93552R), or set the switch located in the
battery compartment (HI 93542, see figure on page 10).

THERMOCOUPLE TYPE SELECTION, KJT

By pressing KJT (HI 93551, HI 93551N and HI 93542) or (ALT+)KJT
keys (HI 93551R, HI93552 and HI 93552R), 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.

HOLD and MR FUNCTIONS

The HOLD function is activated by press­ing 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 HI 93551R, HI 93552 and HI 93552R, 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 tempera­tures 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 dur­ing measurement and the current reading
is assigned to the highest and lowest
temperature values for the displayed chan­nel only.

In HI 93551R, HI 93542, HI 93552 and HI 93552R 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 HI 93551, HI 93551N and HI 93542 models, to disable this
feature set the internal slide-switch located in the battery compart­ment (see figure on page 10).

1110

The HI 93551R, HI 93552 and HI 93552R 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.

2-CHANNEL MODELS (HI 93542, HI 93552 & HI 93552R)

HI 93542, HI 93552 and HI 93552R 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.

BACKLIGHT FEATURE

The HI 93551R, HI 93552 and HI 93552R
models 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.

The 2-channel and HI 93551R 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 tem­perature for the selected channel.

1312

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 re­enter the average mode.

• While in T1-T2 (not for HI 93551R), 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.

SERIAL PORT COMMUNICATION

(HI 93551R & HI 93552R only)

HI 93551R and HI 93552R feature an RS232 output for transfer­ring measurement data (once every second for HI 93551R and once
every 2 seconds for HI 93552R) 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 HI 92000 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

1514

USER CALIBRATION

BATTERY REPLACEMENT

The HI 93551N, HI 93551R, HI 93552 and HI 93552R 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).

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.

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.

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 inter­ferences to radio and TV equipments, 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 electrical shock, do not use these instruments when voltages at the mea­surement surface exceed 24VAC or 60 VDC.

To avoid damages or burns, do not perform any measurement in microwave ovens.

Note: To clean the meters, do not use aggressive detergents. It is

recommended to use water.

1716

ACCESSORIES

K-TYPE THERMOCOUPLE PROBES

with integral handle, 1 m (3.3') cable & mini-connector:
HI 766A Roller surface probe, max 320°C/600°F

HI 766B Surface probe, max 650°C/1200°F
HI 766B1 90º Surface probe, max 450°C/840°F
HI 766B2 Spring-loaded, surface probe, max 900°C/1650°F
HI 766B3 Spring-loaded, small surface probe with

insulated shaft, max 200°C/390°F

HI 766C Penetration probe, max 900°C/1650°F
HI 766C1 Ultra-fast penetration probe, max 300°C/570°F
HI 766D Air probe, max 300°C/570°F
HI 766E1 General purpose probe, max 900°C/1650°F
HI 766E2 General purpose probe, max 900°C/1650°F
HI 766F High temperature, flexible wire probe

without handle, max 1100°C/2000°F

HI 766F1 Flexible wire probe w/o handle, max 480°C/ 900°F
HI 766TR1 Penetration probe, max 250°C/482°F
HI 766TR2 Penetration long probe, max 250°C/482°F
HI 766TV1 Pipe clamp probe, max 200°C/390°F

with detachable handle & mini-connector (to be used in
conjunction with the HI 766HD probe handle):

HI 766PA Roller surface probe, max 320°C/600°F
HI 766PB Surface probe, max 650°C/1200°F
HI 766PC Penetration probe, max 900°C/1650°F
HI 766PD Air probe, max 300°C/570°F
HI 766PE1 General purpose probe, max 900°C/1650°F
HI 766PE2 General purpose probe, max 900°C/1650°F

grill surface probe:
HI 766B4 Grill surface probe with 70 cm (27.6’’)cable

(protected with stainless steel jacket),
max 250°C/482°F

HI 7664B4S Spare stainless steel sensor for HI766B4 probe

OTHER ACCESSORIES

HI 710007 Shockproof rubber boot, blue
HI 710008 Shockproof rubber boot, orange
HI 710018 Spare protective case
HI 710031 RUGGED carrying case
HI 766EX Extension cable for K-type probes
HI 766HD Rugged thermocouple probe handle with

1m (3.3') cable fitted with mini-connector

HI 92000 Windows® compatible software
HI 920011 Serial cable for PC connection

1918

SALES AND TECHNICAL SERVICE CONTACTS

Australia:

Tel. [phone] • Fax [phone]

China:

Tel. [phone] • Fax [phone]

Egypt:

Tel. & Fax [phone]

Germany:

Tel. [phone] • Fax [phone]

Greece:

Tel. [phone] • Fax [phone]

Indonesia:

Tel. [phone] • Fax [phone]

Japan:

Tel. [phone] • Fax [phone]

Korea:

Tel. [phone] • Fax [phone]

Malaysia:

Tel. [phone] • Fax [phone]

Singapore:

Tel. [phone] • Fax [phone]

South Africa:

Tel. [phone] • Fax [phone]

Taiwan:

Tel. [phone] • Fax [phone]

Thailand:

Tel. [phone] • Fax [phone]

United Kingdom:

Tel. [phone] • Fax [phone]

USA:

Tel. [phone] • Fax [phone]

For e-mail contacts and complete list of Sales and
Technical offices, please see www.hannainst.com

20

MANKJT R2 06/05