Yamato BK300, BK400, BK500, BK610, BK710 Instruction Manual

before using this unit.

Constant Temperature Water Bath

Model

BK300/400/500/610/710

Instruction Manual

- First Edition -

l Thank you for purchasing " Constant Temperature

Water Bath, BK Series" of Yamato Scientific Co.,
Ltd.

l To use this unit properly, read this "Instruction

Manual" thoroughly before using this unit.
Keep this instruction manual around this unit for
referring at anytime.

WARNING!:
Carefully read and thoroughly understand the
important warning items described in this manual

Yamato Scientific Co. LTD.

Contents

u Cautions in Using with Safety...................................................................1

• Explanation ......................................................................................................................1

• Table of Illustrated Symbols.............................................................................................2

• Fundamental Matters of “WARNING!” and “CAUTION!”.................................................3

u Before Using this unit................................................................................4

• Requirements for Installation...........................................................................................4

u Description and Function of Each Part...................................................7

• Main Unit..........................................................................................................................7

• Control Panel ...................................................................................................................8

• Characters of Thermo Controller.....................................................................................9

u Operation Method.................................................................................... 10

• Operation Mode and Function List................................................................................10

• Operation Mode, Function Setting Key, and Characters...............................................11

• Fixed Temperature Operation........................................................................................12

• Quick Auto Stop Operation ............................................................................................14

• Auto Start Operation ......................................................................................................18

• Overheating Prevention Device.....................................................................................20

• Calibration Offset Function............................................................................................21

u Handling Precautions.............................................................................. 22

u Maintenance Method............................................................................... 24

• Daily Inspection and Maintenance.................................................................................24

u Long storage and disposal ..................................................................... 25

• When not using this unit for long term / When disposing..............................................25

u In the Event of Failure…......................................................................... 26

• Error Display..................................................................................................................26

u After Service and Warranty .................................................................... 28

u Specification............................................................................................. 29

u Wiring Diagram .........................................................................................30

u Replacement Parts Table ........................................................................ 31

u Reference.................................................................................................. 32

• List of Dangerous Substances.......................................................................................32

1

Explanation

Illustrated Symbols

Various symbols are used in this safety manual in order to use the unit without
danger of injury and damage of the unit. A list of problems caused by ignoring
the warnings and improper handling is divided as shown below.Be sure that you
understand the warnings and cautions in this manual before operating the unit.

Cautions in U sing with Safety

MEANING OF ILLUSTRATED SYMBOLS

WARNING!
CAUTION!

If the warning is ignored, there is the danger of a problem that
may cause a serious accident or even fatality.

If the caution is ignored, there is the danger of a problem that may
cause injury/damage to property or the unit itself.

Meaning of Symbols

This symbol indicates items that urge the warning (including the caution).
A detailed warning message is shown adjacent to the symbol.

This symbol indicates items that are strictly prohibited.
A detailed message is shown adjacent to the symbol with specific actions not to
perform.

This symbol indicates items that should be always performed.
A detailed message with instructions is shown adjacent to the symbol.

2

Table of Illustrated Symbols

Warning

Cautions in U sing with Safety

Warning,

generally

Caution

Caution,

generally

Caution,

water only

Warning,

high voltage

Caution,

electrical shock

Caution,

deadly poison

Warning,

high temperature

Caution,

scald

Warning,

drive train

Caution,

no road heating

Warning,

explosive

Caution,

not to drench

Prohibit

Prohibit,

generally

Compulsion

Compulsion,

generally

Prohibit,

inflammable

Compulsion,

connect to the

grounding

terminal

to disassemble

Compulsion,

install on a flat

Prohibit,

surface

Prohibit,

to touch

Compulsion,

disconnect the

power plug

Compulsion,

periodical

inspection

3

Cautions in U sing with Safety

Fundamental Matters of “WARNING!” and “CAUTION!”

WARNING!

Do not use this unit in an area where there is flammable or explosive gas

Never use this unit in an area where there is flammable or explosive gas.
This unit is not explosion-proof. An arc may be generated when the power switch is turned on or off,
and fire/explosion may result. (Refer to page32 “List of Dangerous Substances”.)

Always ground this unit

Always ground this unit on the power equipment side in order to avoid electrical shock due to a power
surge.

If a problem occurs

If smoke or strange odor should come out of this unit for some reason, turn off the power key right
away, and then turn off the circuit breaker and the main power. Immediately contact a service
technician for inspection. If this procedure is not followed, fire or electrical shock may result. Never
perform repair work yourself, since it is dangerous and not recommended.

Do not use the power cord if it is bundled or tangled

Do not use the power cord if it is bundled or tangled. If it is used in this manner, it can overheat and
fire may be caused.

Do not process, bend, wring, or stretch the power cord forcibly

Do not process, bend, wring, or stretch the power cord forcibly. Fire or electrical shock may result.

Substances that can not be used

Never use explosive substances, flammable substances and substances that include explosive or
flammable ingredients in this unit. Explosion or fire may occur.

Do not disassemble or modify this unit

Do not disassemble or modify this unit. Fire or electrical shock or failure may be caused.

Do not touch high-temperature parts

The inside of the body or the door may become hot during and just after operation. It may cause burns.

CAUTION!

During a thunder storm

During a thunderstorm, turn off the power key immediately, then turn off the circuit breaker and the main
power. If this procedure is not followed, fire or electrical shock may be caused.

4

Requirements for Installation

Before Using this unit

WARNING!

1. Always ground this unit

• Connect the power plug to a receptacle with grounding connectors.

• Do not forget to ground this unit, to protect you and the unit from electrical shock in case of

power surge. Choose a receptacle with grounding connectors as often as possible.

• Do not connect the grounding wire to a gas pipe, or by means of a lightning rod or telephone
line. A fire or electrical shock will occur.

• Though BK400/500 model is the 100V single phase model, these two models have the large
electric capacity. Be sure to prepare the power switchboard with the specific grand earth or
specific receptacle.

• BK610/710 model is the 200V single phase mode. Be sure to connect this model to the
specific power switchboard or receptacle for 200V.

2. Choose a proper place for installation

• Do not install this unit in a place where:

♦ Rough or dirty surface.
♦ Flammable gas or corrosive gas is generated.
♦ Ambient temperature exceeds 35°C.
♦ Ambient temperature fluctuates violently.
♦ There is direct sunlight.
♦ There is excessive humidity and dust.
♦ There is a constant vibration.

• Install this unit on a stable place with the space as shown below. This unit should be installed

horizontally by using adjusters on the four corners.

More than 20cm

More than

20cm

Main Unit

Front side

More than

20cm

5

Before Using this unit

Requirements for Installation

3. Do not use this unit in an area where there is flammable or explosive gas

• Never use this unit in an area where there is flammable or explosive gas. This unit is not
explosion-proof. An arc may be generated when the power switch is turned ON or OFF, and
fire/explosion may result.

4. Do not modify

• Modification of this unit is strictly prohibited. This could cause a failure.

5. Installation on horizontal surface

• Set this unit to the flattest place. Not setting this unit with its 4 legs covered with rubber
(BK610/710 has 6 legs) contacted to the setting place surface evenly could cause the vibration
or noise, or cause the unexpectible trouble or malfunction.

6

Requirements for Installation

Before Using this unit

CAUTION!

6. Choose a correct power distribution board or receptacle

• Choose a correct power distribution board or receptacle that meets the unit’s rated electric
capacity.

Electric capacity: BK300: AC100 V, 14A

BK400: AC100 V, 23A
BK500: AC100 V, 25A
BK610: AC200 V (Single phase), 19A
BK710: AC200 V (Single phase), 25A

NOTE)

There could be the case that the unit does not run even after turning ON the power. Inspect
whether the voltage of the main power is lowered than the specified value, or whether other
device(s) uses the same power line of this unit. If the phenomena might be found, change the
power line of this unit to the other power line.

7. Before/after installing

• It may cause injure to a person if this unit falls down or moves by the earthquake and the
impact. etc..To prevent, take measures that the unit cannot fall down, and not install to busy
place.

8. Handling of power code

• Do not entangle the power cord. This will cause overheating and possibly a fire.

• Do not bend or twist the power cord, or apply excessive tension to it. This may cause a fire

and electrical shock.

• Do not lay the power cord under a desk or chair, and do not allow it to be pinched in order to
prevent it from being damaged and to avoid a fire or electrical shock.

• Keep the power cord away from any heating equipment such as a room heater. The cord's
insulation may melt and cause a fire or electrical shock.

• If the power cord becomes damaged (wiring exposed, breakage, etc.), immediately turn off the
power at the rear of this unit and shut off the main supply power. Then contact your nearest
dealer for replacement of the power cord. Leaving it may cause a fire or electrical shock.

• Connect the power plug to the outlet which is supplied appropriate power and voltage.

7

Power switch

Main Unit



Description and Function of Each Part

Front view

Clamp

Support rod

Control panel

Shelf

(Earth leakage breaker)

Heater

Rear view

Rubber leg

Production plate

Power cord

Power cord (BK300)

Drainage hose

8

⑨ ①

Control Panel

Description and Function of Each Part

④

⑦
⑤
⑥

⑧

③

① Start/Stop Key： Starts/stops the operation.
② ▲▼ Key： Uses for rising UP/lowering DOWN the setting value.
③ Menu/Enter Key： Changes the setting item, or setteles the inputed value.

②

④ Heater Lamp： Displays the heater status.

The heater is not at work: Lights off
The heater is at work: Lights up

⑤ Alarm Lamp： Displays the alarm occurred status.

Not occurred the alarm: Lights off
Occurred the alarm: Lights up (and the buzzer sounds)

⑥ Timer Lamp： Displays the timer status.

Stop the operation: Lights off
Not set the timer: Lights off
Timer under running status during operation: Blinks
Timer ended running during operation: Lights up

Measurement Temperature

⑦

Display Unit：
Setting Temperature

⑧

Display Unit：
Overheating Prevention

⑨

Setting Temperature
Display Unit：

Displays the measured temperature, setting character, alarm
information.

Displays the setting temperature, setteing value for timer mode,
remaining time.

Displays the setting temperature for overheating prevention
device.

9

Description and Function of Each Part

Characters of Thermo Controller

Character Identifier

Name Purpose

Sv1

tiM

Md-0

Sv2

Md-6

_tM2

Md-7

Temperature Setting

Time Setting

Overheating Prevention

Setting Mode

Overheating Prevention

Temperature Setting

Operation Setting Mode

Timer Condition Select

Calibration Offset

Setting Mode

Used for setting the temperature.

Used for setting the time.

Used for setting temperature for
overheating prevention device.

Used for setting temperature for

overheating prevention device.

Selects either the operation starting
function or operation condition
function.

Used for selecting the timer condition
for the operation.
(Refer to Page10 ”Operation Method”.)

Used for calibrating the temperature
(inputting the offset value).

_PvS

AStP

End

Pv2

NG

Offset Calibration

Timer Setting Mode Display

Time Up

Overheating Prevention

Measurement Temperature

parameter input unavailable

Used for inputting the offset value for
calibrating the in-bath sensor and
overheating prevention sensor.
(Refer to Page21 ”Calibration Offset
Function”.)

Represents that the unit is under the
quick auto stop operation mode.

Displays when the quick auto stop
operation is completed.

Monitors the measurement value
(current temperature).

It shows up when trying to change the
parameter setting while controller is
starting.

10

1.

1.

Linked to the setting temperature of the device.

Operation Mode and Function List

All the operation mode of this unit is as follows;

No.

Name Description Page

Operation Method

Fixed Temperature
Operation

Quick Auto Stop

2.
Operation

3. Auto Start Operation

NOTE) This unit is impossible to be changed the mode during the operation. "NG" shows up when trying to

change the mode. If the mode requires to be changed, stop the operation.

Pressing the start key activates the operation, and pressing
the stop key stops the operation.

Pressing the start key activates the operation, activates the
timer during the operation, and stops the operation
automatically after passing the specified time. This function
is used for "Stop the operation automatically after passing
the specified time", and "Stop the operation even during the
operation after several hours"

Uses for starting the operation automatically after passing
the specified time. (Not stops automatically .)

12

14

18

The operation function of this unit is as follows;

No.

Overheating
prevention
function

2.

Name Description Page

Auto overheating
prevention function

Overheating
prevention device

If the temperature of in-bath is raised, the
temperature of the device is set for resetting
automatically with that raised temperature plus 6
Celsius degree.

Though the controller, power source, display unit,
and key in unit are shared, this unit is composed
with the individual temperature measurement
circuit, CPU, sensor, and output circuit, and also
is possible to be set at the desired temperature
from the operation panel. If the overheating
prevention device should activate, this unit stops
running, and does not reset unless re

20

3. Calibration offset function

Overheating prevention

4.

temperature calibration
function

This calibration offset function is for calibrating
the difference occurred between the required
in-bath temperature and control temperature
(sensor temperature) of the controller. This unit
can be calibrated toward either plus side or minus
side of the whole temperature range.

When the Item 2 above activates, the temperature
calibration of the overheating prevention device
also activates automatically.

21

11

Operation Method

Operation Mode, Function Setting Key, and Characters

The operation mode setting and function setting use the key operation and characters show in
the following figure.

12

The setting temperature display unit blinks.

SV

SV:

Setting temperature

Operation Method

Fixed Temperature Operation

Start the operation from turning on the power shown in the figure, and continue the operation
under the setting temperature unless turning off the power.

t

▲

Power ON

Setting of the Fixed Temperature Operation

Turn on the power.

1

Toggle the power switch (earth leakage breaker) of
this unit to "ON". The temperature controller
display is lit.

The initial display is appeared about for 4 seconds,
and then the display goes into the measurement
temperature display (in-bath temperature).

v The following information, version of the software,

▲

Power OFF

kind of the sensor to be applied, and setting
temperature of the overheating prevention device,
are displayed in the initial window.

t: Time

Set to the fixed temperature mode.

2

1. Press the Menu/Enter key for 2 seconds, and
display the operation setting mode

(md-6) (blinking) in the measurement temperature
display unit using the ▲▼ keys.

2. Pressing the Menu/Enter key displays the timer
activating function (-tm2).

3.
Select "0" as the fixed temperature mode for the
operation using the ▲▼ keys.

4. Pressing the Menu/Enter key displays
(md-6) (blinking) in the measurement temperature

display unit. This completes the setting.

• Press the Menu/Enter key again for 2 seconds for

going back to the measurement temperature
display.

v The device is set to "0" mode when shipping from the

factory.

13

Fixed Temperature Operation

Set the temperature.

3

Start the operation.

4

Operation Method

1. Pressing the Menu/Enter key displays the
temperature setting (Sv1) in the

measurement temperature display unit.

2. Set the desired temperature using the ▲▼
keys.

3. Pressing the Menu/Enter key completes the
temperature setting.

CAUTION!

Set the temperature between room temperature
+5℃ and 80℃.

After completing the temperature setting, start
the operation.

• Press the Start/Stop key about for 1 second.

• Then the operation starts, and the in-bath

temperature starts going up.

• The heater lamp is lit, and the setting

temperature is displayed in the setting
temperature display unit.

For stopping operation, press the Start/Stop key
again about for 1 second.

14

The setting temperature display unit blinks.

SV:

Setting temperature

Set timer

SV

Activate

t

imer

Start operation

(Manual)

Stop operation (Auto)

Operation Method

Quick Auto Stop Operation

As shown in the following figure, the device stops operating automatically by setting the timer.

▼

(Manual)

Setting of the Quick Auto Stop Operation

Turn on the power.

1

t: Time

t

Toggle the power switch (earth leakage breaker) of
this unit to "ON". The temperature controller
display is lit.

The initial display is appeared about for 4 seconds,
and then the display goes into the measurement
temperature display (in-bath temperature).

v The following information, version of the software,

kind of the sensor to be applied, and setting
temperature of the overheating prevention device,
are displayed in the initial window.

Set into the quick auto stop mode.

2

1. Press the Menu/Enter key for 2 seconds, and
display the operation setting mode

(md-6) (blinking) in the measurement temperature
display unit using the ▲▼ keys.

2. Pressing the Menu/Enter key displays the timer
activating function (-tm2).

3.
Select "1" as the quick auto stop operation using
the ▲▼ keys.

4. Pressing the Menu/Enter key displays
(md-6) (blinking) in the measurement temperature

display unit. This completes the setting.

• Press the Menu/Enter key again for 2 seconds for

going back to the measurement temperature
display.

15

temperature display unit blinks.

Quick Auto Stop Operation

Set the temperature.

3

Operation Method

1. Pressing the Menu/Enter key displays the
temperature setting (Sv1) in the

measurement temperature display unit.

2. Set the desired temperature using the ▲▼
keys. The setting temperature is displayed in
the setting temperature display unit.

3. Pressing the Menu/Enter key completes the
temperature setting.

Then, the time setting (tim) is
displayed in the measurement temperature
display unit, and the setting temperature display
unit blinks.

When starting the quick auto stop operation

4

from the beginning

NOTE) When changing the operation mode into quick

auto stop one during the operation, go to
Procedure 6.

1. The setting
Set the desired temperature using the ▲▼
keys. The value is input as the requiring time
from the current time to the operation ending
time.
e.g.： 7.30 (after 7 hours and half)

2. Pressing the Menu/Enter key again completes
the setting.

16

Quick Auto Stop Operation

Start the operation.

5

Operation Method

When completing the temperature and time
settings, start the operation.

• Press the Start/Stop key about for 1 second.

The operation starts, and the in-bath
temperature starts going up.

• The heater lamp is lit, and the setting

temperature is displayed in the setting
temperature display unit.

• Pressing the Start/Stop key again for 1 second

blinks the timer lamp, and the timer starts.

CAUTION!

Be sure to check the timer lamp blinks.

• The setting temperature display unit is available

to change the display into "Timer setting Mode
Display" (AstP) and "Remaining Timer
Display Until Stopping Operation" in the order

using the ▼ key.

• When the timer stops, the heater lamp is lit off,

and the operation stops. The timer lamp is
changed from blinking status to lit one, and the

time up （End） is displayed in the
setting temperature display unit.

• Pressing the Start/Stop key goes back to the

measurement temperature display.

17

The setting temperature display unit blinks.

Quick Auto Stop Operation

When activating quick auto stop operation

6

during the operation.

Operation Method

This procedure describes the setting of the quick
auto stop operation from the operation status
already running under the fixed temperature
mode.

Though this procedure can be performed any
time of the operation, it is impossible to set the
quick auto stop mode described in the Procedure
2 in advance.

1. Press the Menu/Enter key in the measurement
temperature display twice, and display the time
setting (tim).

2.
Set the desired temperature using the ▲▼
keys. The value is input as the requiring time
from the current time to the operation ending
time.
e.g.： 7.30 (after 7 hours and half)

3. Pressing the Menu/Enter key again completes
the setting.

4. When the setting is completed, press the

Start/Stop key for 1 second. The timer lamp

blinks and the time starts.

• When the timer stops, the heater lamp is lit off,

and the operation stops. The timer lamp is
changed from blinking status to lit one, and the

time up （End） is displayed in the
setting temperature display unit.

• Pressing the Start/Stop key goes back to the

measurement temperature display.

18

The setting temperature display unit blinks.

SV:

Setting temperature

Set timer

▼ Activate Timer

Start operation (Auto)

Activate controller (Manual)

SV

Operation Method

Auto Start Operation

As shown in the following figure, this mode is applied to the device for sta rting the operation after
the specified time (hours) automatically.
Note that the device does not stop the operation automatically. Stop the operation by manual
without fail.

Setting of the Auto Start Operation

Turn on the power.

1

Set into the auto start mode.

2

t: Time

t

Toggle the power switch (earth leakage breaker) of
this unit to "ON". The temperature controller
display is lit.

The initial display is appeared about for 4 seconds,
and then the display goes into the measurement
temperature display (in-bath temperature).

v The following information, version of the software,

kind of the sensor to be applied, and setting
temperature of the overheating prevention device,
are displayed in the initial window.

1. Press the Menu/Enter key for 2 seconds, and
display the operation setting mode

(md-6) (blinking) in the measurement temperature
display unit using the ▲▼ keys.

2. Pressing the Menu/Enter key displays the timer
activating function (-tm2).

3.
Select "2" as the auto start mode using the ▲▼
keys.

4. Pressing the Menu/Enter key displays
(md-6) (blinking) in the measurement temperature

display unit. This completes the setting.

• Press the Menu/Enter key again for 2 seconds for

going back to the measurement temperature
display.

19

The setting temperature display unit blinks.

Auto St art Operation

Set the time, and start the operation.

3

Operation Method

1. Pressing the Menu/Enter key displays the
temperature setting (Sv1) in the

measurement temperature display unit.

2. Set the desired temperature using the ▲▼
keys. The setting temperature is displayed in
the setting temperature display unit.

3. Pressing the Menu/Enter key completes the
temperature setting.

Start the operation.

4

After completing the temperature setting, the
time setting (tim) is displayed in the

measurement temperature display unit

1.
Set the desired temperature using the ▲▼
keys. The value is input as the requiring time
from the current time to the operation starting
time.
e.g.： 7.30 (after 7 hours and half)

2. Pressing the Menu/Enter key again completes
the setting.

CAUTION!

Be sure to check the timer lamp blinks.

• When the timer reaches to the setting time, the

timer lamp changes from blinking status to lit
one. Then the heater lamp is lit, and the
device starts the operation.

20

mode for overheating prevention device

Overheating Prevention Device

Operation Method

Set temperature of overheating prevention device.

1. Press the Menu/Enter key for two seconds,
then press the ▲▼ keys to select the setting

(md-0) (blink).

2. Press the Menu/Enter key again to indicate the
temperature setting of overheating prevention
device (Sv2) on the temperature
display window.

3. Press the ▲▼ keys to select the desired
temperature while the indication is blinking.

4. Press the Menu/Enter key again to determine
the temperature set in 3. above. The
temperature set above is indicated on the
display.

• The overheating prevention setting temperature

is displayed in the display unit.

• Press the Menu/Enter key for two seconds to

go back to the temperature indication.

Notes for overheating prevention device

• In case there is a small difference between the set values of temperature for overheating
prevention device and that of controller, the overheating prevention device may be activated
when the temperature reaches to the set value of controller.Set the temperature of overheating
prevention device so it be at least 5℃ or more higher than that of controller.

• For activating the overheating prevention device at the desired temperature without fail, check
previously that it activates at that temperature with its preset value gradually lowered while
keeping the desired in-bath temperature. An alarm lamp lights on and buzzer sounds when the
overheating prevention device activates. This unit indicates Er07 and stops the operation.

• The default value of the overheating prevention device at factory shipment is 90℃.

21

bath temperature

ce either to plus or minus side

The indication blinks when offset correction

Current temperature

Corrected temp. to p

lus side

Corrected temp. to

minus

side

Operation Method

Calibration Offset Function

Calibration offset is a function that corrects the difference between the desired in­and that of controller (sensor temperature). It corrects the differen
in the whole temperature zone of device in parallel.

Temperature Correction

1. Press the Menu/Enter key for two seconds,
then press the ▲▼ keys to select the

calibration offset setting mode (md-7)
(blink) on the temperature display window.

2. The three indications on the window, calibration
offset setting mode (md-7), offset
correction (-Pvs), and overheating
prevention device temperature

(Pv2)
can be switched every time the Menu/Enter key
is pressed.

3.
(-Pvs) is selected. Input the value of

temperature to be corrected with the ▲▼ key.
Press the ▲ key for plus setting and the ▼
key for minus.

4. Press the Menu/Enter key for two seconds after

the setting is completed to go back to the
temperature indication.

• When the temperature of overheating

prevention device (Pv2) is selected in

2. above, the measured temperature of
overheating prevention device sensor is
indicated on the temperature indication window.

• Calibration offset is adjustable within the

temperature range of 99.9℃ to -99.9℃.

Temperature correction for overheating prevention
device:

Temperature correction on the controller can
automatically correct that on overheating
prevention device with the same value.

22

might be accumulated, and also might affect (descend) the heater efficiency or heater life.

Handling Precautions

WARNING!

If a problem occurs

If smoke or strange odor should come out of this unit for some reason, turn off the power key
right away, and then turn off the circuit breaker and the main power. Immediately contact a
service technician for inspection. If this procedure is not followed, fire or electrical shock may
result. Never perform repair work yourself, since it is dangerous and not recommended.

Substances that cannot be used

Never use explosive substances, flammable substances and substances that include explosive
or flammable ingredients in this unit. Explosion or fire may occur. (Refer to page32 “List of
Dangerous Substances”.)

CAUTION!

Do not step on this unit

Do not step on this unit. It will cause injury if this unit fall down or break.

Do not put anything on this unit

Do not put anything on this unit. It will cause injury if fall.

During a thunder storm

During a thunderstorm, turn off the power key immediately, then turn off the circuit breaker and
the main power. If this procedure is not followed, fire or electrical shock may be caused.

Clean this unit with enough

Though this unit is cleaned beforehand, clean it with enough after leaving for a long period or
when using it for the first time.

Water to be applied

Do not use the water including other liquids.
The recommended water to be applied is, if possible, either ion exchange water or distilled water,
and purify the water sometimes. When applying the ground water or tap water, a fur or dirt

Purify water as required.

Water supply

When supplying water, pay attention not to spill water from the water bath or spread over the
water bath. Should be spread a water over the operation panel, wipe it off completely. Failure
to do so could cause the electric leakage or electric shock.

Countermeasure for stop operation during night or long-term stop

In case of stopping operation during night or long-term, toggle the power switch (earth leakage
breaker) to "OFF".

23

heater might be red hot, the heater life descends seriously. What is worse, it could cause a fire.

Handling Precautions

CAUTION!

Unattended continuous operation

In case of performing unattended continuous operation, pay attention to the auto supplying water
device (non-operation device, Level Controller (OBF10 Model) product code: 221570) for not
heating with empty status.

Pay attention not to heat empty bath. (Overheating prevention device performance)

Do not operate this unit with empty water bath or with its heater spilled the water from. The
Be sure to check the water amount of the water bath before the operation, and supply water as

required.
This unit has the overheating prevention device in itself, and goes off the electricity in case of
occurring the heating of empty bath. Please contact to Yamato Science Service Office if the
heating of empty bath is occurred.

Return after power failure

When power is supplied after a power failure, the device automatically starts operation again with
the same state as just before the power failure. It is danger that the device starts unattached
operation after a power failure. We recommend for you to turn off the switch of this unit if a
power failure occurs during operation.

24

Maintenance Method

Daily Inspection and Maintenance

For the safety use of this unit, please perform the daily inspection and maintenance without fail.
Using the city water to this unit might attach dirt. Do inspe ct and maintain this point while
performing daily inspection and maintenance.

WARNING!

• Disconnect the power cable from the power source when doing an inspection or maintenance
unless needed.

• Perform the daily inspection and maintenance after returning the temperature of this unit to the
normal one. (Be sure to check the water in the test bath is cooled down.)

• Do not disassemble this unit.

CAUTION!

• Use a well-drained soft cloth to wipe dirt on this
unit. Do not use benzene, thinner or cleanser for
wiping. Do not scrub this unit. Deformation,
deterioration or color change may result in.

Monthly maintenance

• Check the earth leakage breaker function.

1. Connect the power cord.

2. Turn the breaker on.

3. Push the red test switch by a ballpoint pen etc.

4. If there is no problem, the earth leakage breaker will be turned off.

Water bath maintenance

• The density of the water in the water bath is concentrated gradually, and dirt might be attached and
accumulated. If a fur or dirt is attached or accumulated, dip the water out of the water bath, and
clean it completely.

• Use Ion exchange water or distilled water and clean the chamber occasionally. In case of using
ground water or tap water, clean more often since it results accumulation of fur or dirtmightwhich
affects heater efficiency and its life.

circulation pump maintenance

• Remove foreign body inside of circulation pump. Also remove foreign body such as a piece of grass
materials in the bath very often. Leaving those stuff cause troubles of circulation pump. Make sure if
inside of the pump has foreign body while flushing water to exchange water.

Hose replacement

• For using this unit with stability, replace the hose once per two year as a guide. Please ask Yamato
Scientific to the hose replacement.

For any questions, contact the dealer who you purchased this unit from, or the nearest sales
division in our company.

25

Long storage and disposal

When not using this unit for long term / When disposing

CAUTION!

When not using this unit for long term…

• Turn off the power and disconnect the power cord.

WARNING!

When disposing…

• Keep out of reach of children.

• Remove the door.

• Treat as large trash.

Environmental protection should be considered

We request you to disassemble this unit as possible and recycle the reusable parts considering to
the environmental protection. The feature components of this unit and materials used are
listed below.

Component Name Material

Exterior Parts

Outer covering Steel plate
Bath Stainless steel SUS304
Inspection window Semi-tempered glass
Pole support Aluminum die cast
Production plates Polyethylene (PET) resin film
Operation unit frame, Corner Alkylbenzenesulfied (ABS) resin
Fancy rubber, Rubber board Chloroprene rubber

Electrical Parts

Switch, Relays Resin, Copper, Other composites
Board Glass fiber, Other composites
Pipe heater Copper
Power cord Composites with synthetic rubber, Copper, Nickel

Parts for Piping

Hoses Ethylene Propylene Rubber (EPR)
Drain hose
Hose clamp 66 Nylon
Drain cap

Options

Connector Aluminum die cast
Flask clipper Aluminum die cast
Pole SUS304

Polyacetar

Vinyl chloride resin

26

The buzzer sounds!

In the Event of Failure…

Error Display

The followings are the error indications displayed on the controller.

The device stops the heater and notify it with an error code display, alarm lamp and buzzer
sound when an error occurred. Record the error code and turn off the power of device. Call us
if any trouble arises.

Error Code Failure

Er00

Er01

Er02

Er03

Er07

Er14

Er70

Memory Error

Temperature Sensor Error

SSR Short-circuit

Heater Disconnection

Overheating Prevention
Error

Inter-Communication Error

Temperature Input Error

Error in setting value of memory.
Replace the board.

Temperature sensor is broken or disconnected.
Check and, if required, replace the sensor.
Release the error by resetting the power supply.

Failure in SSR
Replace SSR.
Release the error by resetting the power supply.

Heater is disconnected or heater circuit is broken.
Release the error by resetting the power supply.

Overheating protection device is operated.
Check the cause of failure.
Release the error by resetting the power supply.

Replace the substrate.

Failure in temperature input circuit
Check the circuit.

27

Trouble Shooting

Condition Possible Causes

In the Event of Failure…

The device does not start when
turning on the power switch.

Alarm lamp lights on.

Temperature does not rise.

Strange noise from circulation pump.

• Power source is turned off.

• Power failure.

• Setting value of overheating prevention is lower than that of

in-bath temperature.

• The setting temperature is lower than that of in-bath
temperature.

• Is there air flow in the pump? Release air once cut off the
power supply while flowing water from pump inlet.

When power failure occurs…

• When power is supplied after a power failure, the device automatically starts operation again with
the same state as just before the power failure. It is danger that the device starts unattached
operation after a power failure.

• We recommend for you to turn off the switch of device if a power failure occurs during operation.

In the case if the error other than listed above occurred, turn off the power switch and primary
power source immediately. Contact the shop of your purchase or nearest Yamato Scientific
Service Office.

28

After Service and Warranty

In Case of Request for Repair

If the failure occurs, stop the operation, turn OFF the power switch, and unplug the power plug.
Please contact the sale s agency that this unit was purchased, or the Yamato Scientific's sales
office.

< Check following items before contact >

◆ Model Name of Product

◆ Production Number

◆ Purchase Date

◆ About Trouble (in detail as possible)

Minimum Retention Period of Performance Parts for Repair

The minimum retention period of performance parts for repair of this unit is 7 years after
discontinuance of this unit.
The "performance part for repair" is the part that is required to maintain this unit.

See the production plate attached to this unit.

29

Specification

BK300 BK400 BK500 BK610 BK710
Operating temperature

range
Temperature

adjustment accuracy
Temperature

distribution accuracy
Time required to reach

highest temperature

Approx.
120min.

Approx.

110min.
In-bath material Stainless steel SUS304, Glass
Temperature

control system

PID control by microcomputer (fixed value system)

Sensor Platinum resistance bulb (Pt 100Ω)
Temperature

setting system
Temperature

display system
Overheating prevention

system
Overheating prevention

setting system
Overheating

prevention sensor

K-thermocouple (W -sensor with Pt 100Ω)

Heater

1.3KW 2.2KW 2.4KW 3.5KW 4.5KW

Stirrer

6W 30W 30W 60W

Timer

Safety device
Internal dimensions

(W×D×H mm)
External dimensions

(W×D×H mm)
Inspection window

dimensions

Earth leakage breaker , Overheating prevention device, Self-diagnostic functions

300×300×300 400×350×300 500×400×350 548×500×400 640×500×450

490×360×367 590×410×367 690×460×417 738×560×467 830×560×517

240×215 340×215 440×265 340×215 440×265

1 minute to 99 hours 59 minutes, and 100 hours to 999 hours

Digital setting, Auto start and auto stop function

(heater disconnection, TRIAC short circuit, overheat prevention)

In-bath capacity Approx. 27L Approx. 42L Approx. 70L Approx. 109L Approx. 144L
Drain hose size φ15×20

100V AC 200V AC single phase Power supply

(50/60Hz)

14A 23A 25A 19A 25A
Weight Approx. 19Kg Approx. 25Kg Approx. 30Kg Approx. 36Kg Approx. 46Kg
Accessories Shelf:1, Clamp:2, Stand:1, Clamp folder:2, Instruction manual

Accessories

BK300 221195 221192 221189
BK400 221196 221193 221183
BK500 221197 221194 221184
BK610 - - ­BK710 -

Rack for vessels Lid Viscosity meter support Cooling pipe

Ambient temp + 5 to 80℃

±0.02〜±0.07℃

±0.1℃

Approx.
165min.

Approx.
160min.

Digital setting

Digital display

ON/OFF control by microcomputer

Digital setting

Copper pipe heater (Nickel plated)

Magnet pump

Product code Optional

200000

- -

Approx.
200min.

221182

30

AC100V
AC200V

ELB

Ｈ

Ｐ

Ｔ

1

2

3

4

X1

CT

Wiring Diagram

1

CN5

2
3

1

1

CN8

18

2
3

CN4

4
5

X1

6
1

CN1

2

1

3

SSR

2

4

1
2

CN2

3

CN9

TB1

TB2

18

1

＋Ａ

1

−Ｂ

2

ｂ

3

＋

1
2

−

1

CN1

18

PIO1

1

CN2

18

ＴＨ

Pt100 Ω
K

Symbol Part name

ELB Earth leakage breaker

T Terminal block

TIC Planar board

PIO 1 Display circuit board

X1 Relay

CT Current transformer

SSR Solid state relay

H Heater

TH Double sensor

P Circulate pump

5

ＴＩＣ

31

Common Use Parts

Part Name Code No. Specification Manufacturer

Replacement Parts Table

W-sensor 1160030047

VS type
thermoregulator board

Current transform cell 2170010005 CTL-6-S-H URD
Terminal block 2070230002 TSO56-10 5P MENICS
Relay 2050000044 AHE1255 200V Matsushita

1020000042

K-thermocouple
φ4.8L×125L PT1/8

VS-1 (fixed temp.), PIO,
PLANAR, Two tough cards

Yamato Scientific

Yamato Scientific

BK300

Pipe heater BK33-221103-110-2 NMNi1-a3 100V 1.3KW Yamato Scientific
Magnet pump D0020011 CP08-PPRE-10 6W Nickisou
Relay 2050000019 AHE1254 100V Matsushita
Earth leakage breaker 2060000019 FG32R/15-30MA 15A Fuji Denki
SSR 2160000035 TRS5225 Toho Denshi

BK400

Pipe heater BK43-221108-110-2 NMNi1-a3 100V 2.2KW Yamato Scientific
Magnet pump D0020013 CP20-PPRE-10 30W Nickisou
Relay 2050000019 AHE1254 100V Matsushita
Earth leakage breaker 2060000021 FG32R/30-30MA 30A Fuji Denki
SSR 2160000036 TRS1245 Toho Denshi

BK500

Pipe heater BK53-221109-110-2 NMNi1-a3 100V 2.4KW Yamato Scientific
Magnet pump 2150076009 CP30-PPRE-10 30W Nickisou
Relay 2050000019 AHE1254 100V Matsushita
Earth leakage breaker 2060000021 FG32R/30-30MA 30A Fuji Denki
SSR 2160000036 TRS1245 Toho Denshi

BK610

Pipe heater BK610-40020 NMNi1-a3 200V 3.5KW Yamato Scientific
Magnet pump 2150070003

Relay 2050000044 AHE1255 200V Matsushita
Earth leakage breaker 2060000020 FG32R/20-30MA 20A Fuji Denki
SSR 2160000036 TRS1245 Toho Denshi

CP40-PPRE-24 60W
single phase 200V

Nickisou

BK710

Pipe heater BK710-40020 NMNi1-a3 200V 4.5KW Yamato Scientific
Magnet pump 2150070003
Relay 2050000044 AHE1255 200V Matsushita

Earth leakage breaker 2060000021 FG32R/30-30MA 30A Fuji Denki
SSR 2160000036 TRS1245 Toho Denshi

CP40-PPRE-24 60W
single phase 200V

Nickisou

32

List of Dangerous Substances

Never use explosive substances, flammable substances and substances that include explosive
or flammable ingredients in this unit.

EXPLOSIVE

Ethylene glycol dinitrate (nitro glycol), Glycerin trinitrate (nitroglycerine), Cellulose
nitrate (nitrocellulose), and other explosive nitrate esters

Reference

EXPLOSIVE:

FLAMMABLE

IGNITING:

OXIDIZING:

Trinitrobenzene, Trinitrotoluene, Trinitrophenol (picric acid), and other explosive
nitro compounds

Acetyl hidroperoxide (peracetic acid), Methyl ethyl ketone peroxide, Benzyl
peroxide, and other organic peroxides

Lithium (metal), Potassium (metal), Sodium (metal), Yellow phosphorus,
Phosphorus sulfide, Red phosphorus, Celluloid compounds, Calcium carbide,
Lime phosphate, Magnesium (powder), Aluminum (powder), Powder of metals
other than magnesium and aluminum, Sodium hydrosulfite

Potassium chlorate, Sodium chlorate, Ammonium chlorate, and other chlorate
Potassium perchlorate, Sodium perchlorate, Ammonium perchlorate, and other

perchlorate
Potassium peroxide, Sodium peroxide, Barium peroxide, and other inorganic

peroxide
Potassium nitrate, Sodium nitrate, Ammonium nitrate, and other nitrate
Sodium chlorite and other chlorites
Calcium hypochlorite and other hypochlorites
Ethyl ether, Gasoline, Acetaldehyde, Propylene chloride, Carbon disulfide, and

other flammable substances having a flash point of lower than -30℃

INFLAMMABLE

LIQUID:

FLAMMABLE

GAS:

Normal hexane, ethylene oxide, acetone, benzene, methyl ethyl ketone, and
other flammable substances having a flash point of -30℃ or higher but lower
than 0℃

Methanol, Ethanol, Xylene, Pentyl acetate (amyl acetate), and other flammable
substances having a flash point of 0℃ or higher but lower than 30℃

Kerosene, Light oil (gas oil), Oil of turpentine, Isopentyl alcohol (isoamyl alcohol),
Acetic acid, and other flammable substances having a flash point of 30℃ or
higher but lower than 65℃

Hydrogen, Acetylene, Ethylene, Methane, Propane, Butane, and other flammable
substances which assume a gaseous state at 15℃ and 1 atm

(Source: Appendix Table 1 of Article 6 of the Industrial Safety and Health Order in Japan)

33

Responsibility

Please follow the instructions in this document when using this unit. Yamato Scientific has no
responsibility for the accidents or breakdown of device if it is used with a failure to comply.
Never conduct what this document forbids. Unexpected accidents or breakdown may result in.

Note

◆ The contents of this document may be changed in future without notice.

◆ Any books with missing pages or disorderly binding may be replaced.

Instruction Manual for

Constant Temperature Water Bath
Model BK300/400/500/610/710

First Edition Feb. 14, 2001

Yamato Scientific Co., Ltd.

2-1-6 Nihonnbashi Honcho, Chuo-ku,

Tokyo, 103-8432, Japan

http://www.yamato-net.co.jp