English
Operating manual
Refrigerated / Heating Circulator
F34-ED
1.951.0274-V2 06/13
JULABO GmbH
77960 Seelbach / Germany
Tel. +49 (0) 7823 / 51-0
Fax +49 (0) 7823 / 24 91
info@julabo.de
www.julabo.de
19510274-V2.doc 11.07.13
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 operation
and possible applications of our circulators. For optimal utilization of all functions, we
recommend that you thoroughly study this manual prior to beginning operation.
The JULABO Quality Management System
Temperature control devices for research and industry are developed,
produced, and distributed according to the requirements of ISO 9001
and ISO 14001. Certificate Registration No. 01 100044846
Unpacking and inspecting
Unpack the circulator and accessories and inspect them for possible transport damage.
Damage should be reported to the responsible carrier, railway, or postal authority, and a
damage report should be requested. 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.
Printed in Germany Changes without prior notification reserved
Important: keep operating manual for future use
2
ED
TABLE OF CONTENTS
Operating manual .................................................................................................................... 4
1. Intended use ................................................................................................................... 4
1.1. Description .................................................................................................................. 4
2. Operator responsibility – Safety recommendations ......................................................... 4
2.1. Disposal ...................................................................................................................... 6
2.2. EC Conformity ............................................................................................................ 7
2.3. Warranty conditions .................................................................................................... 7
2.4. Technical specifications .............................................................................................. 8
Operating instructions ........................................................................................................... 10
3. Safety notes for the user ............................................................................................... 10
3.1. Explanation of safety notes ....................................................................................... 10
3.2. Explanation of other notes ........................................................................................ 10
3.3. Safety recommendations .......................................................................................... 11
4. Operating controls and functional elements .................................................................. 13
5. Preparations .................................................................................................................. 15
5.1. Installation ................................................................................................................. 15
5.2. Bath fluids ................................................................................................................. 16
5.3. Filling / Draining ........................................................................................................ 17
5.4. Temperature application to external systems ........................................................... 18
5.5. Tubing ....................................................................................................................... 18
5.6. Adjusting the pump flow ............................................................................................ 19
6. Operating procedures ................................................................................................... 20
6.1. Power connection ..................................................................................................... 20
6.2. Switching on / Start – Stop ........................................................................................ 20
6.3. Automatic / non-automatic start mode ...................................................................... 21
6.4. Setting the temperatures ........................................................................................... 22
6.5. Safety installations according to IEC 61010-2-010 ................................................... 22
6.5.1. Excess temperature protection .......................................................................... 22
6.5.2. Low liquid level protection ................................................................................. 22
7. Troubleshooting guide / Error messages ...................................................................... 23
8. Cleaning / repairing the unit .......................................................................................... 24
3
Operating manual
Operating manual
1. Intended use
JULABO circulators have been designed to control the temperature of specific fluids in a bath
tank. The units feature pump connections for temperature control of external systems (loop
circuit).
JULABO circulators are not suitable for direct temperature control of foods, semiluxury foods and tobacco, or pharmaceutical and medical products. Direct
temperature control means unprotected contact of the object with the bath
medium (bath fluid).
1.1. Description
The circulators are operated via the splash-proof keypad. The implemented
microprocessor technology allows to set and to store the setpoint that can
be indicated on the LED temperature display.
PID1
The PID temperature control adapts the heat supplied to the thermal
requirements of the bath.
Safety installations conforming to IEC 61010-2-010
The excess temperature protection is a safety installation independent from
the control circuit.
The safety value is set using a tool (screwdriver).
If the low level protection device is triggered, a complete shutdown of the
heater and circulating pump is effected.
2. Operator responsibility – Safet y recommendations
The products of JULABO ensure safe operation when installed, operated, and maintained
according to common safety regulations. This section explains the potential dangers that may
arise when operating the circulator and also specifies the most important safety precautions to
preclude these dangers as far as possible.
4
ED
Persons:
The operator is responsible for the qualification of the personnel operating the units.
The operator should be constantly informed about the dangers involved with their job activities
as well as preventive actions.
Make sure all persons expected to carry out operation, installation and maintenance of the unit
read and understand the safety information and operating instructions.
If you have any questions concerning the operation of your unit or the information in this
manual, please contact us!
Contact
Handling:
Nevertheless, avoid strikes to the housing, vibrations, damages to the keypad foil (keys,
display) or contamination.
Make sure the product is regularly checked for proper condition.
Regularly check (at least every 2 years) the proper condition of the mandatory, warning,
prohibition and safety labels.
Take care that the mains supply features a low impedance to avoid any negative affects on
the instrument being operated in the same mains.
This unit is designed for operation in a controlled electromagnetic environment. This
means that transmitting devices (e.g. cellular phones) should not be used in the immediate
vicinity.
Magnetic radiation may influence other units with components susceptible to magnetic
fields (e.g. a monitor). We recommend to keep a minimum distance of 1 m.
Permissible ambient temperature: max. 40 °C, min. 5 °C.
Permissible relative air humidity: 50 % (40 °C).
Do not store in an aggressive atmosphere. Protect from contaminations.
Do not expose to sunlight.
JULABO GmbH
Eisenbahnstraße 45
77960 Seelbach / Germany
Tel. +49 (0) 7823 / 51-0
Fax +49 (0) 7823 / 24 91
info@julabo.de
www.julabo.de
Appropriate operation:
Only qualified personnel is authorized to perform configuration, installation, maintenance and
repairs of the circulator.
Routine operation can also be carried out by untrained personnel who should however be
instructed by trained personnel.
Use:
The bath may not be filled with flammable materials. Fire hazard!
Only use recommended materials (bath fluids). Only use recommended materials (bath fluids).
Only use non-acid and non corroding materials.
5
Operator responsibility – Safety recommendations
When using hazardous materials or materials that could become hazardous, the operator
must affix the enclosed safety labels (1 + 2) to the front of the unit so they are highly visible:
1
2
or
2
Particular care and attention is necessary because of the wide operating range.
There are thermal dangers:
Burn, scald, hot steam, hot parts and surfaces that can be touched.
Warning label W00: Colors: yellow, black
Danger area. Attention! Observe instructions.
(operating manual, safety data sheet)
Mandatory label M018: Colors: blue, white
Carefully read the user information prior to beginning operation.
Scope: EU
Semi S1-0701 Table A1-2 #9
Carefully read the user information prior to beginning operation.
Scope: USA, NAFTA
Warning label W26: Colors: yellow, black
Hot surface warning.
(The label is put on by JULABO)
2.1. Disposal
Do not dispose of the unit with household waste! This unit contains the refrigerants R134a –
at this time considered not to have any negative effects on the ozone layer. However, during
the long operating period of the unit, disposal prescriptions may change. So only qualified
personnel should take care of disposal.
Valid in EU countries
See the current official journal of the European Union – WEEE directive.
Directive of the European Parliament and of the Council on waste electrical
and electronic equipment (WEEE).
This directive requires electrical and electronic equipment marked with a
crossed-out trash can to be disposed of separately in an environmentally
friendly manner.
Contact an authorized waste management company in your country.
Disposal with household waste (unsorted waste) or similar collections of
municipal waste is not permitted!
6
ED
2.2. EC Conformity
The products described in the operating instructions conform to the
requirements of the following European guidelines:
Directive of the European Parliament and of the Council on the
approximation of the laws of the Member States relating to machinery.
EMC guideline with respect to legal harmonization of the member countries
concerning electromagnetic compatibility.
JULABO GmbH
Eisenbahnstr. 45
77960 Seelbach / Germany
2.3. Warranty conditions
JULABO 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 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, limited to a maximum of 10 000 working hours.
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 GmbH’s original invoice.
JULABO 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.
7
Operator responsibility – Safety recommendations
2.4. Technical specifications
F34-ED
Working temperature range °C -30 ... 100
Temperature stability °C ±0,03
Temperature selection digital
Temperature indication LED
Resolution °C 0.1
Temperature control
Heater wattage (at 230 V) kW 2,0
Heater wattage (at 115V) kW 1,0
Cooling capacity
Medium ethanol
Refrigerant R134a
Circulating pump:
discharge, max.at 0 bar l/min 15
pressure, max. at 0 l bar 0.35
Overall dimensions (WxDxH) cm 38x58x62
Bath opening (WxL) cm 24x30
Bath depth cm 15
Filling volume liters 14 ... 20
Weight kg 41
Ambient temperature °C 5 ... 40
Mains power connection 230 V/50 Hz V/ Hz 207-253 / 50
Current input (at 230 V) A 12
Mains power connection 230 V/60 Hz V/ Hz 207-253 / 60
°C
kW
+20 0 -20
0.45 0.32 0.14
Current input (at 230 V) A 13
Mains power connection 115 V/60 Hz V/ Hz 103-127 / 60
Current input (at 115 V) A 14
Mains power connection 100 V/50-60 Hz V/ Hz ------
Current input (at 100 V) A ------
All measurements have been carried out at:
rated voltage and frequency ambient temperature: 20 °C
Technical changes without prior notification reserved.
8
Safety installations according to IEC 61010-2-010:
Excess temperature protection adjustable from 20 to 120 °C
Low liquid level protection float switch
Classification according to DIN 12876-1 class I
Alarm indication optical + audible (permanent)
Environmental conditions according to EN 61 010, part 1:
Use only indoor.
Altitude up to 2000 m - normal zero.
Ambient temperature: +5 ... +40 °C (for storage and transportation)
Air humidity:
Max. rel. humidity 80 % for temperatures up to +31 °C,
linear decrease down to 50 % relative humidity at a temperature of +40 °C
Max. mains fluctuation of ±10 % are permissible.
ED
Protection class according to EN 60 529 IP21
The unit corresponds to Class I
Overvoltage category II
Pollution degree 2
Caution:
The unit is not for use in explosive atmosphere
Standards for interference resistance according to EN 61326-1
This unit is an ISM device classified in Group 1 (using high frequency for internal purposes)
Class A (industrial and commercial range).
9
Operating instructions
Operating instructions
3. Safety notes for the user
3.1. Explanation of safety notes
In addition to the safety warnings listed, warnings are posted throughout the
operating manual. These warnings are designated by an exclamation mark
inside an equilateral triangle. “Warning of a dangerous situation (Attention!
Please follow the documentation).”
The danger is classified using a signal word.
Read and follow these important instructions for averting dangers.
Warning:
Describes a possibly highly dangerous situation. If these instructions are not
followed, serious injury and danger to life could result.
Caution:
Describes a possibly dangerous situation. If this is not avoided, slight or minor
injuries could result. A warning of possible property damage may also be
contained in the text.
Notice:
Describes a possibly harmful situation. If this is not avoided, the product or
anything in its surroundings can be damaged.
3.2. Explanation of other notes
Note!
Draws attention to something special.
Important!
Indicates usage tips and other useful information.
10
3.3. Safety recommendations
Follow the safety recommendations to prevent damage to persons or property.
Further, the valid safety instructions for working places must be followed.
Only connect the unit to a power socket with earthing contact (PE –
protective earth)!
The power supply plug serves as safe disconnecting device from the line
and must be always easily accessible.
Operation is permitted with non-flammable liquids only.
Place the instrument on an even surface on a pad made of non-
inflammable material.
Do not stay in the area below the unit.
Make sure you read and understand all instructions and safety precautions
listed in this manual before installing or operating your unit.
Never operate the unit without bath fluid in the bath.
Check the filling level of the bath fluid from time to time. Pump and heater
must always be fully covered with the bath fluid!
ED
The instrument is not suited for unsupervised continuous operation.
Do not drain the bath fluid while it is hot!
Check the temperature of the bath fluid prior to draining (by switching the
unit on for a short moment for example).
Observe the limited working temperature range when using plastic bath
tanks.
Employ suitable connecting tubing.
Make sure that the tubes are securely attached.
Never operate damaged or leaking equipment.
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.
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.
11
Safety notes for the user
Caution:
The temperature controlling i.e. of fluids in a reactor constitutes normal
circulator practice.
We do not know which substances are contained within these vessels.
Many substances are:
inflammable, easily ignited or explosive
hazardous to health
environmentally unsafe
i.e.: dangerous
The user alone is responsible for the handling of these substances!
The following questions shall help to recognize possible dangers and to reduce
the risks to a minimum.
Are all tubes and electrical cables connected and installed?
Note:
sharp edges, hot surfaces in operation, moving machine parts, etc.
Do dangerous steams or gases arise when heating?
Is an exhaust needed when working?
What to do when a dangerous substance was spilled on or in the unit?
Before starting to work, obtain information concerning the substance and
determine the method of decontamination.
Notice: Check the safety installations at least twice a year!
Excess temperature protection according to IEC 61010-2-010.
With a screwdriver turn back the adjustable excess temperature protection
until the shut-down point (actual temperature).
Low level protection according to IEC 61010-2-010.
To check the function of the float, it can be manually lowered with a
screwdriver for example.
12
4. Operating controls and functional elements
Front view Rear view
ED
1a
1b
2
3
4
5
6
Mains power switch, illuminated for circulator
Mains power switch, illuminated for cooling machine
Edit keys
Setpoint increase or decrease
Press keys shortly for step-by-step changes,
Keep the keys pressed for fast change of setpoint
OK key (store)
LED temperature display, menu indication
Control indicator –Heating
Control indicator – Alarm
13
Operating controls and functional elements
7
Adjustable excess temperature protection
according to IEC 61010-2-010
8a
8b
15
A
M
P
Circulator: Mains circuit breakers (resettable) 15 A
Mains fuses for cooling machine: T 10,0 A, D5 x 20 mm
10a
10b
Mains power cable with plug for circulator
Mains power cable with plug cooling machine
11 Drain port
12
Drain tap
13 Venting grid, removable
14a
14b
Pump connector for feed
Pump connector for return
15
ALARM
16
Connector: Cooling machine control
(not in use for operation with ED circulator)
Selector dial for cooling machine
Position "0" for operation with ED circulator.
17 Built-in mains outlet for connection of circulator
14
5. Preparations
5.1. Installation
ED
Place the unit on an even surface on a pad made of
non-flammable material.
The circulator fitted with a stainless steel bridge is
placed on the back of the bath tank leaving the bath
open on the front side.
Set selector dial for cooling machine (16) in position
"0" for operation with ED circulator.
Keep at least 20 cm of open space on the front and
rear venting grids.
Do not set up the unit in the immediate vicinity of
heat sources and do not expose to sun light.
Before operating the unit after transport, wait about
one hour after setting it up. This will allow any oil
that has accumulated laterally during transport to
flow back down thus ensuring maximum cooling
performance of the compressor.
The place of installation should be large enough
and provide sufficient air ventilation to ensure the
room does not warm up excessively because of the
heat the instrument radiates to the environment.
(Max. permissible ambient temperature: 40 °C).
With regard to a disturbance in the cooling loop
(leakage), the guideline EN 378 prescribes a certain
room space to be available for each kg of
refrigerant.
The necessary amount of refrigerant is specified on
the type plate.
> For 0.25 kg of refrigerant R134a, a room space of
1 m3 is required.
15
Preparations
5.2. Bath fluids
Caution:
No liability for use of other bath fluids!
Do not use flammable bath fluids!
Water: The quality of water depends on local conditions.
Due to the high concentration of lime, hard water is not suitable for
temperature control because it leads to calcification in the bath.
Ferrous water can cause corrosion - even on stainless steel.
Chloric water can cause pitting corrosion.
Distilled and deionized water is unsuitable. Their special properties cause
corrosion in the bath, even in stainless steel.
Recommended bath fluids:
Bath fluid Temperature range
soft/decalcified water 5 °C to 80 °C
mixture water/glycol, mixture 1:1 -20°C to 50°C
Thermal G -30°C to 80°C
JULABO Bath liquids Order No.
Thermal G 10 Liters 8 940 124
Thermal G 5 Liters 8 940 125
Notice:
Please contact JULABO before using other than recommended bath fluids.
Only use non-acid and non corroding bath fluids.
JULABO takes no responsibility for damages caused by the selection of an
unsuitable bath fluid.
Unsuitable bath fluids are liquids which e.g.
are very highly viscous
(much higher than 30 mm2 /s at the respective working temperature)
have corrosive characteristics or
tend to cracking.
See website for list of recommended bath fluids.
Contact: see page 5
16
5.3. Filling / Draining
Notice: Filling
Check the filling level of the bath fluid from time to time. Pump and heater
must always be fully covered with the bath fluid!
The instrument is not suited for unsupervised continuous operation.
ED
Filling
Take care that no liquid enters the interior of the circulator.
Recommended maximum filling level with water as bath liquid:
20 mm below the tank rim
After filling, immerse the samples in the bath or place the lid on
the bath, in case the opening is not to be used.
Draining
Turn off the circulator and cooling machine.
Hold the venting grid, pull out and remove.
Slide a short piece of tube onto the drain port (11) and hold it
into a pail.
Unscrew the drain tap (12) and empty the unit completely.
Tighten the drain tap.
Notice: Draining
Do not drain the bath fluid while it is hot!
Recommendation: Temperature range 5 °C to 40 °C
Check the temperature of the bath fluid prior to draining (by switching the unit
on for a short moment, for example).
17
Preparations
5.4. Temperature application to external systems
Caution:
Securely attach all tubing to prevent slipping.
If the circulator is operated without external system, close the pump connector
(14a) with the cap nut.
The circulator is used for temperature application to external,
closed systems (temperature loop) with simultaneous bath
internal temperature application.
Connecting an external system:
Unscrew the collar nut from the pump connector (14a).
Slide the tubing onto the pump connectors for feed and
return flow (14a, 14b). Secure the tubing with tubing
clamps.
Feed Return
Use tubing insulation.
5.5. Tubing
Recommended tubing:
Order No. Length Temperature range
8930008 1 m CR® tubing 8 mm ID -20 °C ... 120 °C
8930010 1 m CR® tubing 10 mm ID -20 °C ... 120 °C
8930108 1 m Viton tubing 8 mm ID -50 °C ... 200 °C
8930110 1 m Viton tubing 10 mm ID -50 °C ... 200 °C
8930410 1 m Insulation for tubing 8 mm ID or 10 mm ID -50 °C ... 100 °C
8970480 2 Tubing clamps, size 1 for tubing 8 mm ID
8970481 2 Tubing clamps, size 2 for tubing 10 or 12 mm ID
18
Warning: Tubing:
At high working temperatures the tubing used for temperature application and
cooling water supply represents a danger source.
A damaged tubing line may cause hot bath fluid to be pumped out within a
short time.
This may result in:
Burning of skin
Difficulties in breathing due to hot atmosphere
Safety recommendations
Employ suitable connecting tubing.
Make sure that the tubing is 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).
Preventive maintenance: Replace the tubing from time to time.
5.6. Adjusting the pump flow
ED
The pump flow is pre-adjusted in the factory and can be
modified to suit user requirements.
2
Using a screwdriver turn the screw (1) anti-clockwise by
360 °.
Using flat pliers turn the marking of the slide (2) to the
1
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 fluid)
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)
19
Operating procedures
6. Operating procedures
6.1. Power connection
Caution:
Only connect the unit to a power socket with earthing contact (PE –
protective earth)!
The power supply plug serves as safe disconnecting device from the line
and must be always easily accessible.
Never operate equipment with damaged mains power cables.
Regularly check the mains power cables for material defects (e.g. for
cracks).
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.
Connect the circulator with mains power cable (10a) to the
mains outlet (17).
Connect the refrigerated circulator with mains power cable
(10b) to the mains socket.
6.2. Switching on / Start – Stop
Switching on:
Circulator and cooling machine may be turned on and off with
separate mains switches. The integrated control light will
illuminate to indicate that power has been applied.
The unit performs a self-test. The segments of the 4-digit LED
temperature DISPLAY and all indicator lights will illuminate (as
illustrated on the left).
Then the software version (example: 11.0) appears. The
display „OFF“ indicates the unit is ready to operate. (standby
mode).
Start:
Press the key for about 4 seconds.
The LED temperature DISPLAY indicates the actual bath
temperature.
Stop:
Press the key for about 4 seconds.
20
Turn the unit off with the mains power switch.
Caution:
If the circulator is turned off with the mains switch (1a), the refrigerating unit
is not switched off simultaneously.
Turn off the refrigerating unit with the mains switch (1b) as well.
Danger of freezing when water is used as bath fluid!
6.3. Automatic / non-automatic start mode
ED
Keep depressed the key and
turn on the circulator with the mains power switch.
For a short while the LED temperature DISPLAY indicates the
effective start mode:
AUTOSTART on.
AUTOSTART off.
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.
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“ on the LED temperature display. A complete
shutdown of the main functional elements such as heater and
circulating 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.
The instrument is not suited for unsupervised continuous operation.
21
Operating procedures
6.4. Setting the temperatures
Factory setting: 25 °C
6.5. Safety installations according to IEC 61010-2-010
Check the safety installations at least twice a year (see page 12)!
6.5.1. Excess temperature protection
Setting can be carried out in the start/stop condition.
1. Press one of the keys for a short moment. The
setpoint value instead of the actual value is indicated on the
display for about 8 seconds. The value can now be changed.
2. Change value:
Press to set a higher value.
Press to set a lower value.
Keep the keys depressed for the value to change fast.
3. Press the key to store the value.
This safety installation is independent of the control circuit. When
the temperature of the bath fluid has reached the safety
temperature, a complete shutdown of the heater and pump is
effected.
The alarm is indicated by optical and audible signals (continuous
tone) and on the LED-DISPLAY appears the error message
"Erro 14".
Setting range: 20 °C to 120 °C
Using a screwdriver turn the setting screw to the desired value.
Recommendation:
Set the excess temperature protector at 5 to 10 °C above the
working temperature setpoint.
6.5.2. Low liquid level protection
This safety installation is independent of the control circuit.
If the low liquid level protection device is triggered, a complete
shutdown of the heater and circulating pump is effected.
The alarm is indicated by optical and audible signals (continuous
tone) and on the LED-DISPLAY appears the error message "Error
01".
Turn off the unit with the mains switch, refill bath fluid and turn
the unit on again!
22
7. Troubleshooting guide / Error messages
ED
+
Whenever the microprocessor electronics registers a failure, a complete
shutdown of the heater and circulating pump is performed. The alarm
light " " illuminates and a continuous signal tone sounds.
The LED temperature display indicates the cause for the alarm in form
of a code.
Press the key to quit the audible signal.
The circulator is operated without bath fluid, or the liquid level is
insufficient.
Replenish the bath tank with the bath fluid.
Tube breakage has occured (insufficient filling level due to excessive
bath fluid pumped out). Replace the tubing and replenish the bath
tank with the bath fluid.
Cable of the working temperature sensor interrupted or short-
circuited.
Defect of the working or excess temperature sensor.
Working temperature and excess temperature sensors report a
temperature difference of more than 35 K.
Error in A/D converter
The excess temperature value lies below the working temperature
Cooling compressor overload protection
setpoint.
Set the excess temperature to a higher value.
Cable of the excess temperature sensor interrupted or short-
circuited.
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.
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.
The motor of the cooling compressor is equipped with an overload
protector, which will be activated by excessive temperature in the
capsule or by excessive current consumption. Poor air circulation
(distance to walls, dirt accumulated on condenser) may cause the motor
to be disconnected. After a short cooling interval, the motor will be
automatically reconnected.
23
Cleaning / repairing the unit
15
A
M
P
Circulator: Mains circuit breakers (resettable) 15 A
Cooling machine: Fuse T 10.0 A, dia.5 x 20 mm
The mains fuses on the rear of the unit may easily be exchanged as
shown on the left.
Warning:
Before exchanging the fuses, turn off the mains power switch and disconnect
the power plug from the mains socket!
Only use fine fuses with a nominal value as specified.
Example:
Manufacturer Supplier Type Order No.
Wickmann Wickmann G- fuse insert
No. 19195
T10,0A 5x20 mm
8. Cleaning / repairing the unit
Caution:
Always turn off the unit and disconnect the mains cable from the power
source before cleaning the unit.
Prevent humidity from entering into the circulator.
Electrical connections and any other work must be performed by qualified
personnel only.
To maintain the full cooling performance, clean the condenser from
time to time.
Switch off the unit, disconnect mains power cable.
Hold the venting grid, pull out and remove.
Clean the ribbed condenser with a vacuum cleaner.
Replace the venting grid.
Switch on the unit.
24
ED
Cleaning
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.
The circulator is designed for continuous operation under normal
conditions. Periodic maintenance is not required.
The tank should be filled only with a bath fluid recommended by
JULABO. To avoid contamination, it is essential to change the bath
fluid from time to time.
Repairs
Before asking for a service technician or returning a JULABO
instrument for repair, please contact an authorized JULABO
service station.
When returning the unit:
Clean the unit in order to avoid any harm to the service
personnel.
Attach a short fault description.
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.
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