Julabo MV-4, MV-12, MV-6, MV-26, MW-6 User Manual

19511402.doc

Circulators

MV-4/ MV-6/ MV-12/ MV-26

MW-4/ MW-6/ MW-12/ MW-26

MW-Z

!

1.951.1402BE2 01/03

Operating controls and functional elements

2

Congratulations!

You have made an excellent choice.
JULABO thanks you for the trust you have placed in us.
This operating manual has been designed to help you gain an understanding of the
principles of operating and possibilities of our circulators. For optimum utilization
of all functions, we recommend that you thoroughly study this manual prior to
beginning operation.

Safety Warnings

Take care your unit is operated only by qualified persons.
Make sure you read and understand all instructions and safety precautions listed in
this manual before installing or operating your unit. If you have any questions
concerning the operation of your unit or the information in this manual, contact
JULABO.
Performance of installation, operation, or maintenance procedures other than those
described in this manual may result in a hazardous situation and may void the
manufacturer's warranty.
Transport the unit with care. Sudden jolts or drops may cause damages in the
interior of the unit.
Observe all warning labels.
Never remove warning labels.
Never operate damaged or leaking equipment.
Never operate the unit without bath fluid in the bath.
Always turn off the unit and disconnect the mains cable from the power source
before performing any service or maintenance procedures, or before moving the
unit.
Always empty the bath before moving the unit.
Never operate equipment with damaged mains power cables.
Refer service and repairs to a qualified technician.

In addition to the safety warnings listed above, warnings are posted
throughout the manual. These warnings are designated by an
exclamation mark inside an equilateral triangle. Read and follow
these important instructions. Failure to observe these instructions can
result in permanent damage to the unit, significant property damage,
personal injury or death.

MV / MW

3

TABLE OF CONTENTS

1. .Operating controls and functional elements....................................................... 4

2. .Quality Management System............................................................................... 6

3. .Unpacking and checking...................................................................................... 6

4. .Description ............................................................................................................ 6

5. .Preparations .......................................................................................................... 7

5.1. Installation.................................................................................................. 7

5.2. Bath liquids and tubing............................................................................. 7

5.3. Filling / draining......................................................................................... 8

5.4. Countercooling.......................................................................................... 9

5.5. Temperature application to external systems......................................10

5.6. Adjusting the pump flow......................................................................... 12

6. .Operating procedures ........................................................................................13

6.1. Power connection...................................................................................13

6.2. Switching on / Start - Stop.....................................................................13

6.3. Setting the temperatures.......................................................................15

6.4. Warning functions...................................................................................16

6.5. Setting the safety temperature (with shutdown function) ....................17

7. .Troubleshooting guide / Error messages.........................................................18

8. .Safety recommendations...................................................................................20

9. .ATC - Absolute Temperature Calibration.........................................................21

10. Configuration for counter-cooling ...............................................................22

11. Electrical connections..................................................................................23

12. Remote control.............................................................................................24

12.1. Setup for remote control........................................................................24

12.2. Communication with a PC or a superordinated data system............25

12.3. List of commands...................................................................................26

12.4. Status messages....................................................................................26

12.5. Error messages......................................................................................27

13. Cleaning the unit...........................................................................................28

14. Maintenance .................................................................................................28

15. Technical specifications..............................................................................29

16. EC Declaration of Conformity.....................................................................31

17. Warranty conditions .....................................................................................32

Operating controls and functional elements

4

1. Operating controls and functional elements

!

5

6

7

9

10

11

12

1

2

3

4

8

14

15

16

20a1320b

Rear view

20a MV

Feed Return

20b MW Suction pump

Pressure pump

MV / MW

5

1 Mains power switch, illuminated

2 Start / stop key

3 Working temperature T1

4 Working temperature T2

5 High temperature warning limit

6 Low temperature warning limit

7 Safety temperature

8 Adjustable excess temperature protection

(safety temperature)

9 MULTI-DISPLAY (LED) temperature indication

10 Cursors left/right

11 Edit keys (increase/decrease setting)

12 Enter key (store)

Indicator light - Alarm

Indicator light - Cooling (not operational)

Indicator light - Heating

13 Connector: alarm output

14

1

5

69

RS232C interface

15 Mains fuses, fuse holders

16 Mains power cable with plug

20a Pump connectors on MV

20b Pump connectors on MW

Quality Management System

6

2. Quality Management System

The JULABO Quality Management System:
Development, production and distribution of temperature
application instruments for research and industries conform to
the requirements according to DIN EN ISO 9001:1994-08.

Certificate Registration No. QA 051004008.

3. Unpacking and checking

Unpack the circulator and accessories and check for damages incurred during
transit. These should be reported to the responsible carrier, railway, or postal
authority, and a request for a damage report should be made. These instructions
must be followed fully for us to guarantee our full support of your claim for
protecting against loss from concealed damage. The form required for filing such a
claim will be provided by the carrier.

4. Description

The JULABO circulators are suitable for temperature application to liquids in a
bath tank.
The main functional elements are the heater, circulation pump, and control
electronics. An electronic proportional temperature control (PID characteristic)
adapts the heat supplied to the thermal requirements of the bath.

Setting is rapid and simple using the keypad with its easy to learn symbols. Keypad
is splash-proof, easily cleaned and ergonomically designed.
The microprocessor technology allows four temperature values to be stored and
indicated on the MULTI-DISPLAY (LED): working temperatures T1 and T2, high
and low temperature warning limits.

The safety value for excess temperature protection, a safety installation
independent from the control circuit, is adjustable on the front and visible on the
MULTI-DISPLAY (LED).

The RS232C port permits modern process engineering without additional interface,
directly on-line, from the circulator to your application equipment.

The circulator conforms to the safety requirements specified by DIN 12 876
(safety class III), as well as DIN 58 966, and the guideline for first voltage range
EN 61010.

MV / MW

7

5. Preparations

5.1. Installation

!

Heating circulators

 Place the circulator in an upright position.

Bridge mounted circulator

 Place the bath tank in an upright position.
 Adjust the bridge to width of the bath tank and

place it on the bath tank.
Bridge is extendable from 310 mm to 660 mm.

5.2. Bath liquids and tubing



Operation with flammable bath liquids permitted.

 Recommended bath liquids:

Bath liquids Temperature range Flash point fire point

Thermal M +50 °C ... 170 °C >275 °C >320 °C

Thermal H +50 °C ... 250 °C >280 °C >350 °C

deionized water 5 °C bis 80 °C

ATTENTION: The maximum permissible viscosity is 30 mm2 x s

-1.

No liability for use of other bath liquids!

Order No. Bath liquid

8 940 100
8 940 101
8 940 102
8 940 103

Thermal M
Thermal M
Thermal H
Thermal H

10 liters container

5 liters container

10 liters container

5 liters container

Preparations

8

 Recommended tubing:

Temperature range

CR tubing
Viton tubing

-20 °C to +120 °C

-50 °C to +200 °C

5.3. Filling / draining

Filling
Take care that no liquid enters the interior of the

circulator.

• Recommended maximum filling level with water as

bath liquid: 25 mm below the tank rim

• Recommended maximum filling level with bath oils:

40 mm below the tank rim

ATTENTION: the volume of bath oils will increase due to
thermal expansion when the bath temperature rises.

Exercise CAUTION when emptying hot bath liquids!

Draining

• Press the mains switch to turn the circulator off.

• Place the heating circulator near the rim of the table.

Use a suitable vessel as recipient for the bath liquid.

• A drain plug is located on the front of the bath tank

that is unscrewed to drain the bath.

• Remove the bridge mounted circulator from the bath

tank.

• Empty the bath tank.

Store and dispose the used bath liquid according
to the laws for environmental protection.

MV / MW

9

5.4. Countercooling

25a

25b

25b

25a

For applications near the ambient temperature, the
cooling coil must be connected to the water mains.

Using tubing, connect the cooling coil (25a) to the tap
water supply, and lead the tap water in a sink through
the return connector (25b).

A specific water flow rate of 130 ml/minute (MW) or
100 ml/minute (MV) is sufficient to compensate for the
characteristic temperature.

By installing the MVS controller (26) and a solenoid
valve (27), sudden temperature increases can be rapidly
reversed by tap water flowing through the built-in
cooling coil.
Low water consumption: For applications requiring
constant near-ambient temperature, tap water is only
used in small amounts. Configuration see page 22.

Order No. Description
9 790 000 MVS controller
8 980 700 Solenoid valve, 220 V

26

27

25b25a

Preparations

10

NOTE: Flow-through cooler
Order No. Description

9 655 825 FD200
The FD200 is suitable as cooling device for liquids

in closed circuits (loops).
This unit is integrated in the return flow circuit
from the external system connected to a circulator,
and continuously withdraws heat from the liquid.

5.5. Temperature application to external systems

Temperature application to external, closed systems.

The circulator is used for temperature application to external, closed systems (loop
circuit) with simultaneous temperature application in the circulator bath.

24a

24b

Connecting the external system:

• Unscrew the collar nut from the pump connector

(24a).

• Slide the tubing onto the pump connectors for feed

and return flow (24a, 24b).

24a

24b

 Unscrew the M 16 x 1 collar nuts on the pump

connectors (pressure pump 24a, suction pump 24b)
with a 19 mm (3/4") wrench and remove the sealing
disks. Using the collar nuts, screw on the tubing
connection fittings delivered with the unit
(8 mm or 12 mm in diameter) and tighten firmly.

 Push on the tubings, and secure with tube clamps.

 Attach the tubings to the connectors of the external

closed system, e.g., an instrument with a pressure­resistant temperature jacket or a temperature coil, and
fasten with tube clamps to prevent slipping.

MV / MW

11

Temperature application to external, open systems

K

S

D

H

S = Suction pump connection

D = Pressure pump connection

K = Float

H = Height adjustment

MW circulators are equipped with both a pressure and
suction pump for external temperature application in
open systems.
Connections are to be made as described on page 10.

Differing flow rates of the pressure and suction pumps
should be compensated. To maintain a constant liquid
level, the JULABO "D+S" Level Adapter is
recommended for the external bath tank. The flow
rate of the pressure pump (24a) will be then regulated
by a built-in float device. The liquid level may be
changed by a height adjustment on the "D+S" Level
Adapter.

Order No. 8 970 410 "D+S" Level Adapter



Note: If the liquid levels in the circulator bath and the external system
are at different heights, overflowing must be prevented after the
power has been turned off. Close off both connection tubings with
standard pinchcocks or shut-off valves

Order No. Description
8 970 456 Shut-off valve (suitable up to +90 °C)
8 970 457 Shut-off valve (suitable up to +250 °C)

Fasten tubing to prevent slipping.

Preparations

12

5.6. Adjusting the pump flow

1

2

The pump flow is pre-adjusted in
the factory and can be modified to
suit user requirements.

• Using a screwdriver turn the screw (1)

anti-clockwise by 360 °.

• Using flat pliers turn the marking of the

slide (2) to the desired position.

• Tighten the screw.

Examples:

Internal applications in the bath

A 100 % internal bath circulation

(for large bath tanks)

B Reduced internal bath circulation

(for smooth surface of bath liquid)

External/internal applications

C 40 % external discharge,

60 % internal circulation
(for large bath tanks)

D 80 % external discharge,

20 % internal circulation
(for small bath tanks)

MV / MW

13

6. Operating procedures

6.1. Power connection

Connect the unit only to a grounded mains power socket!
We disclaim all liability for damage caused by incorrect line
voltages!

Check to make sure that the line voltage matches the
supply voltage specified on the identification plate.

Deviations of ±10 % are permissible.

6.2. Switching on / Start - Stop

Switching on:
Turn on the mains power switch.

The unit performs a self-test. All segments of the 4-digit
MULTI-DISPLAY (LED) and all indicator lights will
illuminate.

Then the software version (example: n 1.2) appears.
The display "OFF" or "r OFF" indicates the unit is
ready to operate (standby mode).

The circulator enters the operating mode activated
before switching the circulator off:

keypad control mode (manual operation) or
remote control mode (operation via personal

computer).

Start:
 Press the start/stop key.

- The MULTI-DISPLAY (LED) indicates the actual
bath temperature. (example: 21.0 °C)

- An illuminated indicator light in the "T1" or "T2"
key indicates the activated working temperature.

Stop:
 Press the start/stop key.

The MULTI-DISPLAY (LED) indicates the message
"OFF".

Operating procedures

14



The unit also enters the safe operating state "OFF" or "r OFF after a
mains power interruptance. The temperature values entered via the
keypad remain in memory. With the circulator in keypad control
mode, press the start/stop key to restart operation.
With the circulator in remote control mode, the personal computer
must first resend the parameters set via the interface before the
circulator may be restarted.

NOTE:

The circulator has been configured and supplied by JULABO according to
N.A.M.U.R. recommendations. This means for the start mode, that the unit must
enter a safe operating state after a power failure (non-automatic start mode). This
safe operating state is indicated by „OFF“ or „rOFF“, resp. on the MULTI­DISPLAY (LED). A complete shutdown of the main functional elements such as
heater and circulation pump is effected simultaneously.
Should such a safety standard not be required, the AUTOSTART function
(automatic start mode) may be activated, thus allowing the start of the circulator
directly by pressing the mains power switch or using a timer.

Automatic / non-automatic start mode

Activating/deactivating AUTOSTART

 Keep depressed enter and the start/stop

key

 and turn on the circulator with the mains

power switch.

For a short while the MULTI-DISPLAY indicates
the effective start mode:

 AUTOSTART on.

 AUTOSTART off.

MV / MW

15

Warning:

For supervised or unsupervised operation with the AUTOSTART
function, avoid any hazardous situation to persons or property.
The circulator does no longer conform to N.A.M.U.R. recommend­ations.

Take care you fully observe the safety and warning functions of the
circulator.

6.3. Setting the temperatures

Setting the working temperature "T1":

 Press the setpoint key .

The indicator light blinks and the value previously set
appears on the MULTI-DISPLAY (LED).

 Use the cursor keys to move left or right

on the display until the numeral you wish to change is
blinking.

 Use the increase/decrease arrows to

change the selected numeral (-, 0, 1, 2, 3, ... 9).

 Press enter to store the selected value

(example: 37.0 °C).

The working temperature is maintained constant after a
short heat-up time (e. g. 37.0 °C).

Setting the working temperature "T2":

 Press the setpoint key .
 Same procedure
 as with "T1"
 (example: 25.0 °C).

Selecting the working temperature:

• Press the setpoint key or and then enter

.

Operating procedures

16

6.4. Warning functions



)) )) ))

More protection for your samples in the bath!
An audible signal sounds in intervals when the actual
temperature value exceeds one of the set limits
(patented).

Setting the high temperature limit:

 Press the key .

The indicator light blinks and the value previously set
appears on the MULTI-DISPLAY (LED).

 Use the cursor keys to move left or right

on the MULTI-DISPLAY (LED) until the numeral
you wish to change is blinking.

 Use the edit keys to increase or decrease

the numeral value (-, 0, 1, 2, 3, ... 9).

 Press enter to store the value

(example: 39.0 °C).

Setting the low temperature limit:

 Press the key .
 Follow the instructions
 for

 (example: 35.0 °C).



Note: The warning functions will only be triggered when the
actual bath temperature, after start from the „OFF“ or „rOFF“
mode, lies within the set limits for 3 seconds.

MV / MW

17

6.5. Setting the safety temperature (with shutdown function)

!

+



))))

(excess temperature protection / low liquid level
protection)

These safety installations are independent of the control
circuit. When the temperature of the bath liquid has
reached the safety temperature or the liquid level is
insufficient, a complete shutdown of the heater and
pump is effected.

The alarm is indicated by optical and audible signals
(continuous tone) and on the MULTI-DISPLAY (LED)
appears the error message "Error 01".

1. Excess temperature protection

• Press the key to indicate the safety temperature value

on the MULTI-DISPLAY and using a screwdriver
simultaneously turn the setting screw to the desired
value (example: 50 °C).

Setting range: 20 °C to 210 °C in 2 °C steps
Recommendation:

Set the safety temperature at 5 to 10 °C above the
working temperature setpoint.

Example: Setting the warning functions and

the safety temperature

t

°C

3937352050

2. Low liquid level protection

• This device is triggered when the float reaches a fixed

minimum liquid level.

The excess temperature protection should be set at least 20 °C
below the fire point of the bath liquid used.

In the event of wrong setting there is a fire hazard!
We disclaim all liability for damage caused by wrong settings!

Troubleshooting guide / Error messages

18

7. Troubleshooting guide / Error messages

!

+



Whenever the microprocessor electronics registers a failure, a
complete shutdown of the heater and circulation pump is

performed. The alarm light " " illuminates and a continuous
signal tone sounds.

Cause Remedy

• The circulator is operated

without bath liquid, or the liquid
level is insufficient.

• Replenish the bath

tank with the bath
liquid.

• Tube breakage has occured

(insufficient filling level due to
excessive bath liquid pumped
out).

• Replace the tubing and

replenish the bath tank
with the bath liquid.

• The float is defect (e. g., because

damaged in transit).

• Repair by authorized

JULABO service
personnel.

• The safety temperature value lies

below the working temperature
setpoint.

• Set the safety

temperature to a higher
value.

• A heat reaction or sudden

temperature increase, e.g. caused
by an exothermic chemical
reaction or by the immersion of
preheated samples.

• Set the safety

temperature to a higher
value.

After eliminating the malfunction, press the mains power switch
off and on again to cancel the alarm state.

• The wires of the working temperature sensor are interrupted

or short-circuited.

• Defect of the working or safety temperature sensor.

The difference between the working temperature and safety
sensors is above 25 °C.

MV / MW

19


 other errors



After eliminating the malfunction, press the mains power switch
off and on again to cancel the alarm state.
If the unit cannot be returned to operation, contact an authorized
JULABO service station.

If the error message "Configuration Error" appears, contact an
authorized JULABO service station.

Disturbances that are not indicated.

Pump motor overload protection

• The pump motor is protected against overloading.

After a short cooling interval, the motor will
automatically start running.

Mains fuses

• The mains fuses on the rear of the unit may easily be

exchanged as shown on the left.

(Fine fuse T 10.0 A, dia. 5 x 20 mm)

Only use fine fuses with a nominal value as specified.

Safety recommendations

20

8. Safety recommendations

Follow the safety recommendations to prevent damage to persons
or property. Further, the valid safety instructions for working
places must be followed.

 Connect the unit only to a grounded mains power socket!

 Observe the flash point of the bath medium used.

The excess temperature protection should be set at least 20 °C
below the fire point.

 Pay attention to the thermal expansion of bath oil during heating

to avoid overflowing of the liquid.

 Prevent water from penetrating into the hot bath oil.

 Some parts of the bath cover and the pump connections may

become extremely warm during continuous operation. Therefore,
exercise particular caution when touching
these parts.

 Exercise caution when emptying hot bath liquids!

 Observe the limited working temperature range when using plastic

bath tanks.

 Employ suitable connecting tubing.

 Make sure that the tubes are securely attached.

 Avoid sharp bends in the tubing, and maintain a sufficient distance

from surrounding walls.

 Regularly check the tubing for material defects (e.g. for cracks).

 Before cleaning the unit, disconnect the power plug from the

mains socket.



Recommendation:

When you have finished the application, it is recommended to
keep on circulating the liquid in the bath or the external system for
some time. Simultaneously set the working temperature to +20 °C
to allow the temperature in the system to decrease slowly.
Thus fractional over-heating of the bath liquid is prevented.

MV / MW

21

9. ATC - Absolute Temperature Calibration

Circulator (T

T

)

Measuring point
(TM)

ATC serves to compensate a temperature difference that might
occur between circulator and a defined measuring point in the
bath tank because of physical properties.

The difference temperature is determined (ΔT= T

M

- T

T

)

and stored as correcting factor (example ΔT = -0.2 °C).

Measuring point
(T

M

)

 Press the cursor key and enter at the same time.
 The MULTI-DISPLAY (LED) indicates "Atc0".

 With the edit keys select "Atc1" and then press

enter .

 Using the cursor keys and the edit keys

set the correcting factor (example -0.20 °C) and then press

enter .

 Press and at the same time.

The temperature on the measuring point rises to a temperature
of 37.0 °C and is indicated on the MULTI-DISPLAY (LED).



Note:

The correcting factor always affects the actual working
temperature, even if this is set via the interface.

The ATC function stays activated until resetting to 00.00 °C.



Recommendation:
In case a calibrated temperature measuring instrument is used,
the ATC function allows the circulator to be used as testing
instrument according to DIN/ISO 9000.

Configuration for counter-cooling

22

10. Configuration for counter-cooling

Software version
number





Model combination

The basic circulator is supplied factory-prefitted with
software, e.g. version n 3.0, providing the configuration
for a heating circulator.

In case the circulator is to be assembled with a JULABO
solenoid valve controller (MVS see page 9) or a
JULABO refrigerated bath, a new configuration must be
performed.



1. Connect the 5-pole control cable between the

connectors " ALARM" and secure attachment.

2. Connect the mains power cables of the circulator
and solenoid valve controller to grounded mains
power sockets. Turn on both mains switches.

3. The unit performs a self-test. Then "CErr" is
indicated on the MULTI-DISPLAY and the red
indicator light "ALARM" illuminates.



4. Press enter to confirm the message "CErr".
The display indicates "OFF" and the indicator light
"ALARM" goes out.

5. Select the initialization level by pressing
simultaneously the keys , and .

The value last entered („In 0“) is indicated.

6. By pressing the key set the last digit of the
parameter to indicate „In 3“ for use of an MVS
controller.

Model combination Value
using refrigerated bath type „F“ (e. g. F34) In 2
using MVS controller or
refrigerated bath type „FP“ In 3



7. Now press enter to confirm and to finish
initialization.



The new configuration is indicated during the self-test
(example n 3.3).

MV / MW

23

11. Electrical connections

 / ALARM connector

The " ALARM" connector may be used as output for
alarm messages.

Circuit: Operation = relay powered

Alarm = relay not powered

Pin assignment:
Pin 1: +24 V (max. current 25 mA)

Pin 2: 0 V
Pin 3: Alarm relay
Pin 4: Reserved - do not use!
Pin 5: Cooling pulse

RS232C serial interface

This port can be used to connect a computer with an
RS232C cable for remote control of the circulator.

RS232C

Pin assignments:
Pin 2 RxD Receive Data

Pin 3 TxD Transmit Data
Pin 5 0 VD Signal GND
Pin 6 DTR Data terminal ready
Pin 7 RTS Request to send
Pin 8 CTS Clear to send

Interface correspondence:

Circulator Computer  Circulator Computer


9-pole 25-pole  9-pole 9-pole
Pin 2 RxD ⇔ Pin 2 TxD  Pin 2 RxD ⇔ Pin 3 TxD
Pin 3 TxD ⇔ Pin 3 RxD  Pin 3 TxD ⇔ Pin 2 RxD
Pin 5 GND ⇔ Pin 7 GND  Pin 5 GND ⇔ Pin 5 GND
Pin 6 DTR ⇔ Pin 6 DSR  Pin 6 DTR ⇔ Pin 6 DSR
Pin 7 RTS ⇔ Pin 5 CTS  Pin 7 RTS ⇔ Pin 8 CTS
Pin 8 CTS ⇔ Pin 4 RTS  Pin 8 CTS ⇔ Pin 7 RTS



Use shielded cables only.

Remote control

24

12. Remote control

12.1. Setup for remote control

RS232C

Interface parameters for the circulator are adjusted at
configuration level.

Enter or exit the configuration level by pressing the left arrow

and enter at the same time.

The menu item "Atc" appears on the MULTI-DISPLAY

(LED). After pressing the cursor key , the second menu
item "REMOTE" is indicated. The interface parameters
cannot be adjusted unless the display reads "r 0".

Adjusting interface parameters:

Example: changing the baud rate.

 Using the arrow keys move the cursor to the

desired menu. The actual parameter is displayed (example:
"br 24" = 2400 bauds).

 With the up and down arrows change the

number to the desired parameter (example: 4800 bauds).
The changed numerals are blinking.

 The new parameter is stored in memory by pressing enter

.

Adjustable interface parameters

REMOTE 0 = keypad control mode

1 = remote control mode via RS232C

BAUDRATE 12 = 1200 bauds

24 = 2400 bauds
48 = 4800 bauds *
96 = 9600 bauds

PARITY 0 = no parity

1 = odd parity
2 = even parity *

HANDSHAKE

0 = Protocol Xon/Xoff (software handshake)
1 = Protokol RTS/CTS (hardware handshake) *

Data bits: 7; Stop bits: 1*

(* Factory setting )

MV / MW

25



Like all parameters which can be entered through the
keypad, interface parameters are stored in memory
even after the circulator is turned off.

12.2. Communication with a PC or a superordinated data system

Suitable terminal programs for communicating with a PC are:

 MS-Windows - TERMINAL.EXE (included with MS-Windows).
 MS-DOS - Procomm Plus, Datastrom Technologies.
 MS-DOS - Norton Utilities.

If the circulator is put into remote control mode via the
configuration level, the display will read "r OFF" = REMOTE
STOP.

The circulator is now operated via the computer.
In general, the computer (master) sends commands to the

circulator (slave). The circulator sends data (including error
messages) only when the computer asks for it.

A transfer sequence consists of:

• command

• space (⇔; Hex: 20)

• parameter (the character separating decimals in a

group is the period)

• end of file (↵; Hex: 0D)

The commands are divided into in or out commands.
in commands: asking for parameters to be displayed
out commands: setting parameters



The out commands are valid only in remote control mode.

Examples:

• Command to set the working temperature T1 to 55.5 °C:

out_sp_00 ⇔ 55.5↵

• Command to ask for the working temperature T1:

in_sp_00↵

• Response from the circulator:

55.5↵

Remote control

26

12.3. List of commands

Command Parameter Response of circulator

version none Number of software version (V X.xx)

status none Status message, error message (see below)

out_mode_01 0

Use working temperature "T1" *

out_mode_01 1

Use working temperature "T2" *

out_mode_05 0 Stop the circulator = r OFF

out_mode_05 1 Start the circulator

out_sp_00 xxx.x Set working temperature "T1"

out_sp_01 xxx.x Set working temperature "T2"

out_sp_02 xxx.x

Set high temperature warning limit

out_sp_03 xxx.x

Set low temperature warning limit

.

in_sp_00 none Ask for working temperature "T1"

in_sp_01 none Ask for working temperature "T2"

in_sp_02 none

Ask for high temperature warning limit

.

in_sp_03 none

Ask for low temperature warning limit

.

in_pv_00 none Ask for actual bath temperature

in_pv_01 none Ask for the heater wattage being used

12.4. Status messages

Message Description

00 MANUAL STOP Circulator in "OFF" state

01 MANUAL START Circulator in keypad control mode

02 REMOTE STOP Circulator in "r OFF" state

03 REMOTE START Circulator in remote control mode

(* see "Note" on page 21).

MV / MW

27

12.5. Error messages

Message Description

-01 TEMP / LEVEL ALARM Safety temperature or low liquid level
alarm

-03 EXCESS TEMPERATURE

WARNING

High temperature warning " "

-04 LOW TEMPERATURE

WARNING

Low temperature warning " "

-05 TEMPERATURE

MEASUREMENT ALARM

Error in measuring system

-06 SENSOR DIFFERENCE

ALARM

Sensor difference alarm. Working
temperature and safety sensors report
a temperature difference of more than
25 °C.

-07 I2C-BUS WRITE ERROR

-07 I2C-BUS READ ERROR

-07 I2C-BUS READ/WRITE

ERROR

Internal error

-08 INVALID COMMAND Invalid command

-10 VALUE TOO SMALL Entered value too small

-11 VALUE TOO LARGE Entered value too large

-12 WARNING : VALUE EXCEEDS

TEMPERATURE LIMITS

Value lies outside the adjusted range
for the high and low temperature
warning limits. But value is stored.

-13 COMMAND NOT ALLOWED

IN CURRENT OPERATING MODE

Invalid command in current operating
mode

Cleaning the unit

28

13. Cleaning the unit

Before cleaning the unit, disconnect the power plug from the
mains socket!

For cleaning the bath tank and the immersed parts of the circulator,
use low surface tension water (e.g., soap suds).
Clean the outside of the unit using a wet cloth and low surface
tension water.

Prevent humidity from entering into the circulator.

14. Maintenance

The circulator is designed for continuous operation under normal
conditions. Periodic maintenance is not required.

The tank should be filled only with a bath liquid recommended by
JULABO. To avoid contamination, it is essential to change the
bath liquid from time to time.

Repairs
Before asking for a service technician or returning a JULABO

circulator for repair, please contact an authorized JULABO
service station.

When returning a unit, take care of careful and adequate packing.
JULABO is not responsible for damages that might occur from
insufficient packing.

JULABO reserves the right to carry out technical modifications
with repairs for providing improved performance of a unit.

MV / MW

29

15. Technical specifications

MV MW-Z MW

-4/-6/-12/-26 -4/-6/-12/-26

Working temperature range °C 40 ... 200 25 ... 200 45 ... 200
with tap water cooling °C 20 ... 200 20 ... 200 20 ... 200

Temperature stability ±0.01 °C

Temperature selection digital
via keypad indication on MULTI-DISPLAY (LED)
remote control via personal computer indication on monitor

Temperature indication MULTI-DISPLAY (LED)
Resolution 0.1 °C

ATC - Absolute Temperature Calibration ±3 °C

Temperature control PID

Working temperature sensor Pt 1000
Safety temperature sensor Pt 1000

Heater wattage 2000 W (at 230 V)

or 1000 W (at 115V)

Pressure pump:
pressure, max. at 0 liter 340 mbar 340 mbar 340 mbar
discharge, max. at 0 bar 15l/min 20 l/min 20 l/min

Suction pump:
suction, max. at 0 liter 220 mbar 220 mbar
discharge, max. at 0 bar 14 l/min 14 l/min

Electrical connections
Alarm output 24-0 V DC / max. 25 mA
Computer interface RS232C

Ambient temperature 5 °C ... 40 °C

Mains power connection ±10 % 230 V / 50 Hz

or 115 V / 60 Hz

Total power consumption

(at 230 V) W 2100 2150 2150
(at 115 V) W 1100 1150 1150

All measurements have been carried out at:
rated voltage and frequency ambient temperature: 20 °C
Technical changes without prior notification reserved.

Technical specifications

30

Bridge mounted circulator MW-Z

Usable immersion depth from 90 to 145 mm

Overall dimensions (WxDxH) 320x170x320 mm

Weight 5.5 kg

Heating circulators MV/MW-4 MV/MW-6

Bath opening mm 130x150 130x150

Bath depth mm 150 200

Filling volume liters 3 ... 4.5 4.5 ... 6

Overall dimensions mm 210x410 210x410

(WxDxH) x370 x430

Weight kg 9 / 9 14

Heating circulators MV/MW-12 MV/MW-26

Bath opening mm 220x150 220x300

Bath depth mm 200 200

Filling volume liters 7.5 ... 12 18 ... 26

Overall dimensions mm 300x410 360x610

(WxDxH) x450 x450

Weight kg 15 20

Safety Installations (DIN 12876)
Excess temperature protection adjustable from 20 to 210 °C
Low liquid level protection float switch
Safety class III
Supplementary safety installations:
High temperature warning function optical + audible (in intervals)
Low temperature warning function optical + audible (in intervals)
Supervision of the working sensor plausibility control
Reciprocal sensor monitoring between
working and safety sensors difference >25 °C
Alarm indication optical + audible

Standards:

EMC regulations EN 61326
Guideline for first voltage range EN 61010-1, EN 61010-2-010

MV / MW

31

16. EC Declaration of Conformity

The following unit complies with the essential safety requirements outlined by the
EC Directives concerning the guidelines for electromagnetic compatibility
(89/336/EEC) and for the low voltage regulations (73/23/EEC).

Circulator: MV, MW

This unit is manufactured in compliance with the following guidelines

electrical equipment for control technology and laboratory application –
EMC requirements outlined by

EN 61326

safety regulation for electrical devices for measuring, control and
laboratory application specified by

EN 61010

Julabo Labortechnik GmbH
Eisenbahnstr. 45
D-77960 Seelbach / Germany

G. Juchheim, Managing
Director

Warranty conditions

32

17. Warranty conditions

JULABO Labortechnik GmbH warrants its products against defects in material or
in workmanship, when used under appropriate conditions and in accordance with
appropriate operating instructions for a period of no less than

ONE YEAR

Extension of the warranty period – free of charge

With the ‘1PLUS warranty’ the user receives a free of charge extension to the
warranty of up to 24 months or 10.000 working hours; which ever is achieved
first.

To apply for this extended warranty the user must register the unit on the Julabo
web site www.julabo.de, indicating the serial no. The extended warranty will apply
from the date of Julabo Labortechnik GmbH’s original invoice.

Julabo Labortechnik GmbH reserves the right to decide the validity of any
warranty claim. In case of faults arising either due to faulty materials or
workmanship, parts will be repaired or replaced free of charge, or a new
replacement unit will be supplied.

Any other compensation claims are excluded from this guarantee.