JULABO FC600-T User Manual

English

Operating

manual

Recirculating coolers

FC1200S FCW1200S
FC1600S FCW1600S
FC1200T FCW1200T
FC1600T FCW1600T
FCW2500T
FC600-T FC1200-T FC1600-T

1.951.4811-V2 06/13

JULABO GmbH
77960 Seelbach / Germany
Tel. [phone] / 51-0
Fax [phone] / 24 91
[e-mail]
www.julabo.de

19514811-V2.doc 26.07.13

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

Printed in Germany Changes without prior notification reserved

Unpack the recirculating cooler 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.

Important: keep operating manual for future use

2

Recirculating coolers

Table of Contents

1. Intended use ............................................................................................... 4

1.1. Description ................................................................................................. 4

2. Operator responsibility – Safety instructions .............................................. 4

2.1. Disposal ...................................................................................................... 6

2.2. EC Conformity ............................................................................................ 7

2.3. Warranty conditions .................................................................................... 7

2.4. Technical specifications .............................................................................. 8

2.5. Cooling water connection ......................................................................... 13

3. Safety notes for the user .......................................................................... 14

3.1. Explanation of safety notes ...................................................................... 14

3.2. Explanation of other notes ........................................................................ 14

3.3. Safety instructions .................................................................................... 14

4. Operating controls and functional elements ............................................. 16

5. Operation .................................................................................................. 19

5.1. Preparations ............................................................................................. 19

5.2. Return flow safety device ......................................................................... 20

5.3. Bath fluids ................................................................................................. 21

5.4. Tubing ...................................................................................................... 21

5.5. Power connection ..................................................................................... 22

5.6. Filling ........................................................................................................ 22

5.7. Draining .................................................................................................... 23

5.8. Connecting an external sensor ................................................................. 24

6. Manual operation ..................................................................................... 25

6.1. Switching on ............................................................................................. 25

6.2. Start .......................................................................................................... 25

6.2.1. Automatic / non-automatic start mode.......................................... 26

6.3. Setting the setpoint temperatures ............................................................. 27

6.3.1. Setting the temperature ................................................................ 27

6.3.2. Setting the control ratio for feed/return flow temperature ............. 28

6.3.3. Setting the safety temperatures ................................................... 29

6.3.4. Low liquid level protection ............................................................ 29

6.4. PID control parameters ............................................................................. 30

7. Trouble shooting guide ............................................................................. 33

7.1. Other error messages ............................................................................... 34

8. Electrical connections .............................................................................. 34

9. Remote control ......................................................................................... 37

9.1. Communication with a PC or data system ................................................ 37

9.2. List of commands ..................................................................................... 37

9.3. Status messages ...................................................................................... 39

9.4. Error messages ........................................................................................ 39

10. Menu functions ......................................................................................... 40

10.1. Selecting/exiting the configuration level .................................................... 40

10.2. Setting the parameters ............................................................................. 40

10.3. Adjustable parameters .............................................................................. 41

10.4. Selecting/exiting the calibration level ........................................................ 42

10.5. Calibration ................................................................................................ 42

11. Cleaning / repairing the unit ..................................................................... 45

3

Intended use

1. Intended use

JULABO recirculating coolers have been designed for temperature application to specific
fluids. The pump connections can be used for cooling applications in an external circuit at a
constant temperature.

JULABO recirculating coolers are not suitable for direct temperature control of
foods, semi-luxury 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 recirculating cooler consists of

 control unit with splash-proof keypad (microprocessor technology)
 cooling compressor
 heater
 heating/cooling bath and recirculating pump

The electronics comprises two microprocessors that provide reciprocal monitoring via
sensors for the working and safety circuit.
The actual and setpoint temperatures are permanently visible on the MULTI-DISPLAY (LED
1 + LED 2) and thus may be easily compared.
The bath tank is located in the lower part of the unit. The cooling machine draws heat from
the bath liquid via the cooling coil (evaporator). If the setpoint lies above the ambient
temperature, the integrated heater produces more heat.
The integrated circulating pump ensures constant conditions for the external cooling loop and
provides a good circulation of the liquid in the bath tank.
The unit provides analog electrical connections and a serial interface.

Safety installations: High temperature and low temperature limits, both adjustable via the
MULTI-DISPLAY, as well as low liquid level protection.

2. Operator responsibility – Safety instructions

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 recirculating coolers and also specifies the most important safety
precautions to preclude these dangers as far as possible.

4

Recirculating coolers

The operator is responsible for the qualification of the personnel operating the units.

 The personnel operating the units should be regularly instructed about the dangers

involved with their job activities as well as measures to avert these dangers.

 Make sure all persons tasked with operating, installing, and maintaining the unit have read

and understand the safety information and operating instructions.

 When using hazardous materials or materials that could become hazardous, the unit may

be operated only by persons who are absolutely familiar with these materials and the unit.
These persons must be fully aware of possible risks.

If you have any questions concerning the operation of your unit or the information in this
manual, please contact us!

Contact:

Safety recommendations for the operator

 You received a product conceived for industrial use. 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. [phone] / 51-0 [e-mail]
Fax [phone] / 24 91 www.julabo.de

Appropriate Operation

Only qualified personnel is authorized to perform configuration, installation, maintenance and
repairs of the water bath.
Routine operation can also be carried out by untrained personnel who should however be
instructed by trained personnel.

Use

For the use according to the intended purpose, special material requirements have to be
respected (bath fluids). Only use non-acid and non corroding materials.

5

Operator responsibility – Safety instructions
Observe all warnings for the used materials (bath fluids) and the respective instructions

(safety data sheets).
Only use the unit in well ventilated areas. The recirculating coolers are not for use in
explosive atmosphere

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

Observe the instructions in the manuals for instruments of a different make that you connect
to the recirculating cooler, particularly the corresponding safety instructions. Also observe the
pin assignment of plugs and technical specifications of the products.

2.1. Disposal

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

This unit contains the refrigerants R134a or R404A – 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

Recirculating coolers

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.

Low voltage regulations with respect to legal harmonization of the member countries

concerning electric devices for use within certain voltage limits.

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 instructions

2.4. Technical specifications

(with T-pump) FC1200T FCW1200T

Working temperature range °C -10 ... 80 -10 ... 80

Cooling capacity °C 20 10 -10
(water-glycol) kW 0.11 0.75 0.15
Refrigerant R134a
Heater capacity kW 1.2
Pump capacity:
Pressure max. bar 3.5
Flow rate max. Lpm 28
Pump connections M16x1
Noise level, 1 m distance dBA 58 53
Filling volume l 8 ... 11
Dimensions (WxLxH) cm 46 x 61 x 49
Ambient temperature °C 5 ... 40
Shipping weight kg 67 69

Mains power connection V/Hz 208-230/60 or 230/50
Total power consumption W 2600

(with T-pump) FC1600T FCW1600T

Working temperature range °C -15 ... 80 -15 ... 80
Cooling capacity °C 20 10 -10
(water-glycol) kW 1.45 1.05 0.25
Refrigerant R134a
Heater capacity kW 1.2
Pump capacity:
Pressure max. bar 3.5
Flow rate max. Lpm 28
with tubing connections mm dia. 13.5 / 9.5
Pump connections M16x1
Noise level, 1 m distance dBA 58 53
Filling volume l 8 ... 11
Dimensions (WxLxH) cm 46 x 61 x 49
Ambient temperature °C 5 ... 40
Shipping weight kg 67 69

Mains power connection V/Hz 208-230/60 or 230/50
Total power consumption W 2700

All data have been determined at rated voltage and frequency
ambient temperature: 20 °C bath liquid: water-glycol

8

Recirculating coolers

(with T-pump) FCW2500T

Working temperature range °C -25 ... 80
Cooling capacity °C +20 +10 +5 0 -10 -20
(water-glycol) kW 2.5 2.0 1.8 1.5 0.8 0.25
Refrigerant R404A
Heater capacity kW 1.2
Pump capacity:
Pressure max. bar 3.5
Flow rate max. Lpm 28
Pump connections M16x1
Noise level, 1 m distance dBA 70
Filling volume l 8 ... 11
Dimensions (WxLxH) cm 46 x 61 x 49
Shipping weight kg 74
Mains power connection V/Hz 230/60

Total power consumption W 2800

(with S-pump) FC1200S FCW1200S
Working temperature range °C -15 ... 80 -15 ... 80

Cooling capacity °C 20 10 5 -10

(water-glycol) kW 0.12 0.85 0.65 0.26
Refrigerant R134a
Heater capacity kW 1.2
Pump capacity:
Pressure max. bar 1.2
Flow rate max. l/min 22 / 15
with tubing connections mm dia. 13.5 / 9.5
Pump connections M16x1
Noise level, 1 m distance dBA 57 53
Filling volume l 8 ... 11
Dimensions (WxLxH) cm 46 x 61 x 49
Ambient temperature °C 5 ... 40
Shipping weight kg 66 68

Mains power connection V/Hz 208-230/60 or 230/50
Total power consumption W 2800

All data have been determined at mains voltage: 230 V / 50 Hz
ambient temperature: 20 °C bath liquid: water-glycol

9

Operator responsibility – Safety instructions

(with S-pump) FC1600S FCW1600S
Working temperature range °C -15 ... 80 -15 ... 80

Cooling capacity °C 20 10 5 -10

(water-glycol) kW 1.55 1.15 0.9 0.36
Refrigerant R134a
Heater capacity kW 1.2
Pump capacity:
Pressure max. bar 1.2
Flow rate max. l/min 22 / 15
with tubing connections mm dia. 13.5 / 9.5
Pump connections M16x1
Noise level, 1 m distance dBA 57 53
Filling volume l 8 ... 11
Dimensions (WxLxH) cm 46 x 61 x 49
Ambient temperature °C 5 ... 40
Shipping weight kg 66 68

Mains power connection V/Hz 208-230/60 or 230/50
Total power consumption W 2900

(with Ju-pump) FC600 -T
Working temperature range °C -20 ... 80

Cooling capacity °C 20 10 5 -10
(water-glycol) kW 0.6 0.47 0.4 0.21
Refrigerant R134a
Heater capacity kW 1.2
Pump capacity:
Pressure max. bar 0.5
Flow rate max. Lpm 20 / 14
with tubing connections mm dia 13,5/9,5
Pump connections M16x1
Noise level, 1 m distance dBA 51
Filling volume l 6 ... 8
Dimensions (WxLxH) cm 46 x 61 x 49
Ambient temperature °C 5 ... 40
Shipping weight kg 48

Mains power connection V/Hz 208-230/60 or 230/50
Total power consumption W 2000

All data have been determined at rated voltage and frequency
ambient temperature: 20 °C bath liquid: water-glycol

10

Recirculating coolers

(with Ju-pump) FC1200 -T
Working temperature range °C -20 ... 80

Cooling capacity °C 20 10 5 -10
(water-glycol) kW 1.3 0.95 0.75 0.37
Refrigerant R134a
Heater capacity kW 1.2
Pump capacity:
Pressure max. bar 0.5
Flow rate max. Lpm 20 / 14
with tubing connections mm dia. 13,5/9,5
Pump connections M16x1
Noise level, 1 m distance dBA 53
Filling volume l 8 ... 11
Dimensions (WxLxH) cm 46 x 61 x 49
Ambient temperature °C 5 ... 40
Shipping weight kg 65

Mains power connection V/Hz 208-230/60 or 230/50
Total power consumption W 2300

(with Ju-pump) FC1600 -T
Working temperature range °C -20 ... 80

Cooling capacity °C 20 10 5 -10
(water-glycol) kW 1.65 1.25 1.0 0.47
Refrigerant R134a
Heater capacity kW 1.2
Pump capacity:
Pressure max. bar 0.5
Flow rate max. Lpm 20 / 14
with tubing connections mm dia. 13,5/9,5
Pump connections M16x1
Noise level, 1 m distance dBA 53
Filling volume l 8 ... 11
Dimensions (WxLxH) cm 46 x 61 x 49
Ambient temperature °C 5 ... 40
Shipping weight kg 65

Mains power connection V/Hz 208-230/60 or 230/50
Total power consumption W 2400

All data have been determined at rated voltage and frequency
ambient temperature: 20 °C bath liquid: water-glycol

11

Operator responsibility – Safety instructions

Temperature selection digital (keypad)
Resolution °C 0.1
MULTI-DISPLAY indications LED + LED
Resolution °C 0.1
Display accuracy % 0.5
Temperature stability °C ±0.2
Temperature control on/off
Control ratio for feed/return flow temperature, adjustable % 0 ... 100
Temperature sensor (number) PTC (3)
Level indication spy-glass
Error message indication LED
Electrical connections:
Computer interface RS 232
Stand-by input conforming to Namur recommendations
Alarm output potential-free
Return flow safety device V 230
External sensor (4-lead technique) Pt100
Programmer V/mA 0 to 10 / 0 to 24
Temperature recorder (0 V = 0 °C) mV/K 10 (RI = 100 Ohms)

Safety installations
(adjustable via LED):
High temperature protection °C -25 ... 85
Low temperature protection °C -25 ... 85
Low liquid level protection float switch
Classification according to DIN 12876-1 III
Overload protection for pump motor contactor
Overload protection for cooling compressorcontactor
Alarm signal optical + audible

Environmental conditions according to IEC 61 010-1:
Use only indoor.
Altitude up to 2000 m - normal zero.
Ambient temperature: +5 ... +40 °C
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 fluctuations of ±10 % are permissible.
IP class according to IEC 60 529 IP21

The unit corresponds to Class I
Overvoltage category II
Pollution degree 2

Caution:

The unit is not for use in explosive environment.

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).

12

2.5. Cooling water connection

Only for water cooled models - FCW:
Cooling water pressure (IN / OUT ) max. 6 bar
Difference pressure (IN - OUT ) 3.5 to 6 bar
Cooling water temperature <20 °C

Recommended quality of cooling water:

Recirculating coolers

pH – value
Sulfate [SO4 2- ]
Hydrocarbonate [HCO3- ] / Sulphate [SO4 2-]
Hardness [Ca2+, Mg2+] / [HCO3-]
Alkalinity
Conductivity
Chloride (CL-)
Phosphate (PO43-)
Ammonia (NH3)
Free Chlorine
Ferri Ions (Fe3+ )
Mangano Ions (Mn2+)
Carbon dioxide (CO2)
Hydrosulfide (H2S)
Content of oxygen
Algae growth

Suspended solids impermissible

Notice:

7,5 to 9,0
< 100 ppm
> 1 ppm
> 0,5 dH
60 ppm < [HCO3-] < 300 ppm
< 500 μs / cm
< 50 ppm
< 2 ppm
< 0,5 ppm
< 0,5 ppm
< 0,5 ppm
< 0,05 ppm
< 10 ppm
< 50 ppm
< 0,1 ppm
impermissible

Danger of corrosion of heat exchanger due to unsuitable quality of
cooling water.

 Due to its high content of lime hart water is not suitable for cooling and

causes calcination of the heat exchanger.

 Ferrous water or water containing ferrous particles will cause formation of

rust even in heat exchangers made of stainless steel.

 Chlorous water will cause pitting corrosion in heat exchangers made of

stainless steel.

 Due to its corrosive characteristics distilled and deionized water is

unsuitable and will cause corrosion of the bath. .

 Due to its corrosive characteristics sea water is not suitable.
 Due to its microbiological (bacteria) components which settle in the heat

exchanger untreated and unpurified river water and water from cooling
towers is unsuitable.

 Avoid particulate matter in cooling water.
 Avoid putrid water.

13

Safety notes for the user

3. Safety notes for the user

3.1. Explanation of safety notes

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. “Warning of a dangerous situation (Attention! Please follow
the documentation).”
The danger is classified using a signal word.
Read and follow these important instructions.

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.

3.3. Safety instructions

Follow the safety recommendations to prevent damage to persons or

Important!

Indicates usage tips and other useful information.

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 a safe disconnecting device from the

line and must always be easily accessible.

 Place the instrument on an even surface on a pad made of non-

inflammable material.

 Never operate the unit without bath fluid in the bath.

14

 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.

Recirculating coolers

 Do not drain the bath fluid while it is hot or cold!

Check the temperature of the bath fluid prior to draining (by switching the
unit on for a short moment for example).

 Use suitable connecting tubing.
 Avoid sharp bends in the tubing, and maintain a sufficient distance from

surrounding walls.

 Make sure that the tubing is securely attached.
 Regularly check the tubing for material defects (e.g., for cracks).
 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 turn off the unit and disconnect the mains cable from the power

source before cleaning the unit.

 Always empty the bath before moving the unit.
 Transport the unit with care.
 Sudden jolts or drops may cause damage in the interior of the unit.
 Observe all warning labels.
 Never remove warning labels.
 Never operate equipment with damaged mains power cables.
 Repairs are to be carried out only by qualified service personnel.

15

Operating controls and functional elements

4. Operating controls and functional elements

1. Mains power switch, illuminated

1.

7. Filling funnel

8. Drain tubing

9. Drain tap

10. Filling level indication

11. Pump pressure gauge

2. MULTI-Display temperature indication (LED 1 + LED 2)

7.

8.

11.

10.

9.

3. Indicator lights

Alarm
Heating

16

Cooling

Temp.
Control

= Keypad control mode
= Remote control mode

Recirculating coolers

4. Keys for actual values (LED 1)
A Key - Indication of feed temperature

B Key - Indication of return temperature
C Key - Indication of safety temperature

4.1 Key - Indication of actual temperature of external sensor

4.2 The "MENUE" key is not required for normal operating

4.3

The key "SPEC" is not required for this model version.

5. Keys for setpoint values (LED 2)
E Key - Indication or setting of working temperature
F Key - Indication or setting of high temperature
G
H

Key - Indication or setting of low temperature
Key - Indication or setting of control ratio for feed/return

flow temperature
J Key - Circulating pump On/Off

5.1 Key - "SPEC" - PID control parameters

5.2

5.3

Cursors left/right
Edit keys (increase/decrease setting)

5.4 Enter key (start, store)

6. Electrical connectors

ON K ML

O Programmer input and temperature recorder output
N Connector for external Pt100 sensor
K Interface RS 232
M Alarm output (for external alarm signal)
L Stand-by input conforming to NAMUR recommendations
(external emergency switch-off)

17

Operating controls and functional elements

Rear

12.1 Pump connector: Feed

12.2 Pump connector: Return

13. Overflow port for bath tank

14. Connectors for solenoid valves

15. Mains power cable with plug

12.1

16.2

16.1

14.

Only for water cooled models:

16.1 Cooling water OUTLET

16.2 Cooling water INLET

12.2

!

13.

18

5. Operation

5.1. Preparations

Recirculating coolers

12.1 12.2

M16x1

16.2

16.1

14.

12.1

12.2

!

13.

 Place the unit in an upright position.
 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 rejects to the environment. (Max. permissible
ambient temperature: 40 °C).
For a fault (leakage) in the refrigeration system, the
standard EN 378 prescribes a certain room space to be
available for each kg of refrigerant.
> For 0.25 kg of refrigerant R134a, 1 m3 of space is
required.
> For 0.52 kg of refrigerant R404A, 1 m3 of space is
required.

 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.

 Connect the tubings for cooling the external system to the

pump connectors for feed and return (12.1. and 12.2.) on
the rear of the recirculating cooler.
Return flow safety device see page 20

16.1 16.2

¾"

 If necessary, connect a tube to the overflow port (13.) for

controlled draining of the liquid.
Do not close the overflow port.

 Only for water cooled models:

Ensure circulation of cooling water by connecting the
tubing to cooling water inlet (16.2.) and outlet (16.1) on the
rear of the recirculating cooler.
Cooling water temperature: <20 °C
Quality of cooling water see page 13.

Caution:

Securely attach all tubing to prevent slipping.

19

Operation

Notice: Cooling water circuit

Risk of oil leaking from the cooling circuit (compressor) of the recirculating
cooler into the cooling water in case of a fault in the circuit!

Observe the laws and regulations of the water distribution company valid in
the location where the unit is operated.

5.2. Return flow safety device

Notice: Flood hazard!.

In case the system to be cooled is located at a higher level than the
recirculating cooler, take note of bath liquid flowing back when the unit is
switched off.

Return flow safety device

Should the filling volume of the bath tank not be sufficient, prevent the liquid
from flowing back by using shut-off valves..

In case the system to be cooled is located at a higher level
than the recirculating cooler, prevent the bath liquid from
flowing back when the unit is turned off.

For this purpose, connect electrical solenoid valves or
mechanical shut-off valves to the connectors for feed and
return (12.1. and 12.2.).

The solenoid valve is electrically connected to the
connectors (14.). As soon as the recirculating cooler is
switched off, the valves close automatically. (Filling - see

14
.

13
.

12.
1

12.
2

page 22)

Order No. 8 980 701 Set of solenoid valve (230 V)

20

5.3. Bath fluids

Caution:

No liability for use of other bath liquids!
Please contact JULABO before using other than recommended bath fluids.
JULABO takes no responsibility for damages caused by the selection of an
unsuitable bath fluid

Do not use alcohols.

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.

Recirculating coolers

Water: - No liablity for use with water.
Danger of freezing at working temperatures <5 °C.

Recommended bath fluids:

Bath fluids Temperature range
soft/decalcified water 5 °C to 80 °C

5.4. Tubing

Caution:

 Employ suitable connecting tubing.
 Make sure that the tubing is securely attached.

Maximum pressure

 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.

See website for list of recommended bath fluids.
Contact: see page 5

Chloroprene tubing

Textile reinforced tubing

0.5 bar

4.5 bar

21

Operation

5.5. Power connection

Caution:

 Only connect the unit to a power socket with earthing contact (PE – protective

earth)!
We disclaim all liability for damage caused by incorrect line voltages!

 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).

Make sure that the line voltage and frequency match the supply voltage

specified on the type plate.

5.6. Filling

 Connect the tubing from the external system to the pump

connectors and check for leaks.

3

2

1

0

 Hold the venting grid, pull out and remove.

4

5

6

 Check to make sure that the drain tap (9.) is closed.
 Move the filling funnel (7.) to the front and remove cap.

MAX

MIN

 Fill the bath tank and take care of the filling level (10.).

Activating the circulating pump with simultaneous filling of the
external system.

 Turn the mains switch (1.) on

(Switching on - see page 25).

 Press the key "J"

to activate the
pump for filling the cooling loop for the external system.
In case return flow safety devices (Set of solenoid valve)

1
.

7
.

M A X

10
.

M I N

MAX

MIN

9
.

are connected to the connectors (14.) those will
simultaneously be opened.

 Check the filling level (10.) and keep on filling the bath

liquid using the funnel until you get within the level marked
"MAX".

 Close the filling funnel and move it to the back.
 Replace the venting grid.

22

5.7. Draining

Notice:

 Do not drain the bath fluid while it is hot or cold!

 Store and dispose of the used bath fluid according to the environmental

8.

Recirculating coolers

Check the temperature of the bath fluid prior to draining (by switching the
unit on for a short moment, for example).

protection laws.

 Turn the mains switch (1.) off.
 Hold the venting grid, pull out and remove.

1.

1.

 Take the drain tubing (8.) out of the holder and hold it into

3

3

2

2

4

4

5

5

1

1

0

0

6

6

a pail.

 Open the drain tap (9.) and empty the unit completely.
 Close the drain tap and replace the drain tubing into the

MAX

9.

MAX

MIN

MIN

holder.

 Replace the venting grid.

In case the recirculating cooler is placed on the floor, the
unit may be drained using a suction pump unit.

1.

 Connect the drain tubing (8.) to the suction pump unit.

3

2

4

5

1

0

6

 Open the drain tap (9.).
 Switch the pump on and fully empty the unit.

MAX

MIN

9.

8.

23

Operation

5.8. Connecting an external sensor

Connect an external temperature sensor for measuring
and controlling the temperature directly in the external
system.
(Control mode - see page 42).

ACTUAL

N

3

2

4

5

1

0

6

Connect a
Pt100 sensor (Order No. 8 981 003)

10.

MAX

MIN

9.

or
M+R Adapter with Pt100 sensor
(Order No. 8 981 020)

SET

to connector "N"
(sensor calibration - see page 42).

24

6. Manual operation

6.1. Switching on

ACTUAL

SET

 
 

Recirculating coolers

Turn on the mains power switch (1.).
An illuminated switch indicates the unit is on.

The unit performs a self-test. All segments of the
4-digit MULTI-DISPLAY (LED 1 + LED 2) and all indicator
lights will illuminate.

Then the model designation and software version appear
on the MULTI-DISPLAY for about 3 seconds
(Example: FC"1200", "n 9.0").

The display "OFF" indicates the recirculating cooler is
ready to operate (rOFF - see page 37).

6.2. Start

ACTUAL

Actual value Setpoint

SET

 Press the Enter key (5.4) for about 2 seconds.

The MULTI-DISPLAY (LED 1) indicates the actual feed
temperature (example: 20.3 °C).

The MULTI-DISPLAY (LED 2) indicates the setpoint for the
bath temperature
(example: -5.0 °C).

The indicator lights signal the actual operating mode.

- Display Feed temperature (A)

- Display Setpoint bath temperature (E)

- Circulating pump On (J)

- Status Cooling on 

- Control Internal temperature control

- Mode Keypad control mode

25

Manual operation

6.2.1. Automatic / non-automatic start mode
NOTE:

The recirculating cooler 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 MULTI-DISPLAY (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 recirculating cooler directly by pressing
the mains power switch or using a timer.

Activating/deactivating AUTOSTART

1. Turn on the recirculating cooler with the mains power
switch
and
press the Enter key to start operation.

2. Simultaneously press the safety temperature key (C)
and the MENUE key (4.2) to enter the setting mode.

Press the edit key to select the parameter on the

Warning:

MULTI-DISPLAY (LED2).
„1“ - AUTOSTART off.
„0“ - AUTOSTART on.

Press the Enter key to store the parameter.

3. Simultaneously press the safety temperature key (C)
and the MENUE key (4.2) to exit the setting mode.

The AUTOSTART function (automatic start mode)
allows the start of the recirculating cooler directly by
pressing the mains power switch or using a timer.

26

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

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

6.3. Setting the setpoint temperatures

Set the setpoints before or after starting the unit.
Press the setpoint keys (E, F, G, H) to set a value and

press the Enter key to store the value.

Recirculating coolers

6.3.1. Setting the temperature

Example: Setting the bath temperature

ACTUAL

SET

The values will stay in memory when the recirculating
cooler is powered down.

 Press the setpoint key

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

10.8 °C)..

.

 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

ACTUAL

SET

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

 Press enter to store the selected value

(example: -8.0 °C).

27

Manual operation







A

C



6.3.2. Setting the control ratio for feed/return flow temperature

-0.5°C +0.5°C
50

50

21°C 22°C20°C

50 (%)

0 100
20°C

21°C

0 .. 100 (%)

ACTUAL

SET

22.5°C

H

In respect to the values for feed and return temperature
and the factor set with the key "H" an almost constant
temperature value may be maintained in the external
system. The control function quickly responds to changing
conditions (ambient temperature, reaction heat), and thus
spares the use of an external sensor.

The control ratio for feed and return flow temperature is
factory preset to "50:50".
For enabling optimum control performance for asymmetric
experiments, this ratio may be adjusted from 0 to 100 %.
0 % control with full respect
to feed temperature
100 % control with full respect
to return temperature.

Setting:



Press the key .
Follow the instructions under section 6.3.1.
page 27

A B H

40

20°C

21°C

40 (%)

22.5°C





Calculation example:
Look up the values for control ratio, actual feed and return
temperatures on the display by pressing the keys (A, B,
H).
Example: 


RETURN
FEED

factor = 40 %
Formula for calculating the actual value:

*



ACT

22 5

40

CC 

.

100

CT

21

= 22.5 °C



100

20

= 20 °C



FEEDRETURNACT

100 40

()

factorfactor

100

100

)100(

28

6.3.3. Setting the safety temperatures

Recirculating coolers

F G



+ 

ACTUAL

SET

This safety function is independent of the control circuit.

 Press the desired setpoint key (F, G).

Follow the instructions under section 6.3.1.
page 27







Recommendation:

Set the high temperature limit at least 5 K above the actual
bath temperature.

Set the low temperature limit at least 5 K below the setpoint.
When the temperature of the bath liquid reaches the limits of

the safety values, a complete shutdown of the circulating
pump, heater and cooling compressor is effected.
The alarm light illuminates and an audible signal is
triggered. An error message appears on the MULTI­DISPLAY (LED 2)

(see page 33).

Turn the mains switch (1.) off and on. The alarm state is
cancelled and the circulator is put back into operation.
(Switching on - see page 25).

6.3.4. Low liquid level protection

+ 

ACTUAL

SET

As soon as the bath liquid falls below the "MIN" level
(10.), a complete shutdown of the circulating pump,
heater, and cooling compressor is effected.
The alarm light illuminates and an audible signal is
triggered. An error message appears on the MULTI­DISPLAY (LED 2)

(see page 33).

29

Manual operation

6.4. PID control parameters

ACTUAL

SET

SET

For internal and external control two separate parameter
sets are available.
The PID control parameters can be adapted to the
requirements of the controlled member.
The values are preserved after switching off the
recirculating cooler.

 The control parameters are indicated by operating the

key (5.1).

Indications in case of internal control
Parameter Setting range

INT:

CP 1 Xp (example 4.0 K). 0.1 ... 100 K
CP 2 Tn (example 160 s). 1 ... 9999 s
CP 3 Tv (example 20 s). 0 ... 500 s

(Switch-over from INT to EXT:
Cont - see page 42)

Indications of external control EXT:
Parameter Setting range

CP 4 Xp 0.1 ... 100 K

30

CP 5 Tn 1 ... 9999 s
CP 6 Tv 0 ... 500 s
CP 7 Xpu (Cascade control) 1 ... 10 K
HL Max.internal temperature -25 ... 85 °C
LL Min.internal temperature -25 ... 85 °C

Recirculating coolers

With the parameters HL (High Limit) and LL (Low Limit)
the temperature of the internal bath is limited in case of
external control. So, especially for big consumers, a
great overshoot resp. undershoot of the internal
temperature is avoided.

Effect of the limitation of the internal bath temperature:

Without limitation

Limited internal temperature

Each indicated control parameter can be optimized
manually .

Setting:

Operate the key as often until the desired



control parameter is indicated. Example: CP3

 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

31

Manual operation

Optimization instructions for the PID control
parameters:

The heat-up curve reveals inappropriate control settings

optimum setting

Inappropriate settings may produce the following heat-up
curves:

Xp too low

Tv/Tn too low

Xp
or
Tv too high

32

7. Trouble shooting guide

Recirculating coolers

+ 

ACTUAL

SET

Whenever the microprocessor electronics registers a
failure, an alarm is triggered and a complete shutdown is
performed.
The alarm light illuminates and an audible signal is
triggered. An error message appears on the MULTI­DISPLAY (LED 2).

Internal error

High temperature alarm

Low temperature alarm
The values reported by the safety sensor and the sensor in

the feed connector differ by more than 25 K (defective
sensor).
Low liquid level alarm




 Internal errors




Pump disconnection

Compressor disconnection

Heater disconnection

Turn the unit off with the mains switch (1), and eliminate the
malfunction. If the unit cannot be returned to operation,

contact an authorized service station.

33

Electrical connections

2

S

g

7.1. Other error messages

ACTUAL

SET

Incorrect/invalid entry. Value too small or too large, or
function not available.

Under menu item E_Sb the parameter is set to 1, and
the connection between Pin 2 and Pin 3 of the stand­by connector is interrupted (see page 36).

8. Electrical connections

Notice: Use shielded cables only.

The shield of the connecting cable is electrically connected to the plug housing.

Programmer input / Temperature recorder output (O)

5

6

4

3

1

2

Pin Signal .
1 Output: temperature external sensor 10 mV/K
2 Output: calculated temperature in respect
to control ratio for feed/return temp. 10 mV/K
3 Gnd for outputs 0 V
4 Input: programmer 0 to 24 mA
or 0 to 10 V
5 Output: setpoint temperature 10 mV/K
6 Gnd for progammer 0 V

Connector for external Pt100 sensor (N)

1

Pt100

Alarm output (M)

34

hield Plug

solderin

34

2

4

3

Look on

side.

1

Pin assignment:
Pin Signal

1 Current+
2 Voltage+
3 Voltage­ 4 Current-

Recirculating coolers

9

5

1

3

2

Serial interface (K)

1
6

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 7 RTS  Pin 5 CTS  Pin 7 RTS  Pin 8 CTS
Pin 8 CTS  Pin 4 RTS  Pin 8 CTS  Pin 7 RTS

This potential-free change-over contact is activated in case of an
alarm.
Pins 2 and 3 are connected under the following conditions:

- alarm

- status "OFF" and "rOFF"

- mains switch "off"
Switching capacity max. 30 W / 40 VA
Switching voltage max. 125 V/
Switching current max. 1 A

This interface is a 9-pole connector:
Pin 2 RxD Receive Data
Pin 3 TxD Transmit Data
Pin 5 Gnd
Pin 7 RTS Request to send
Pin 8 CTS Clear to send

Accessories:
Order No. Description

8 980 073 RS232 interface cable 9-pol./9-pol. , 2,5 m
8 900 110 USB interface adapter cable

35

Electrical connections

Stand-by input (L)



AK



1

3

2

Return flow safety device

Pin assignment: Pin Signal
1 not used
2 5 V / DC
3 0 V

Activate the stand-by input:
Under menu item E_Sb, set the parameter to 1
(see page 41).
Connect an external contact 'AK' (e.g. for emergency switch-off)
or an alarm contact of the superordinated application system.
In case the connection between Pin 2 and Pin 3 is interrupted by
opening the contact 'AK', a complete shutdown of the circulating
pump, heater and cooling compressor is effected, and the unit
enters the condition "stand-by". The message "E_Sb" appears on
the MULTI-Display (LED2) (see page 34).

Control connector for solenoid valves (14.)
(line voltage: 230 V).

36

9. Remote control

9.1. Communication with a PC or data system

Recirculating coolers

ACTUAL

SET

For remote control, under the menu item OP (Operating
mode) set the parameter to 1.
The message "rOFF" appears on the display.
In general, the computer (master) sends commands to the
recirculating cooler (slave). The recirculating cooler sends
data (including error messages) only when the computer
asks for it.
A transfer sequence consists of:

 command
 space (
 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.

; Hex: 20)





9.2. List of commands

Command Parameter Response of recirculating cooler
version no Number of software version
status no Status message (see below)
out_mode_04

out_mode_04
in_mode_04

0
1
no

Examples:

 Command to set the setpoint to 5.5 °C:

out_sp_00  5.5

 Command to ask for the setpoint:

in_sp_00

 Response from the recirculating cooler:

5.5



Set control mode via PC
Set control mode via programmer input (O)
Ask for actual control mode



out_mode_05
out_mode_05
in_mode_05

0
1
no

Stop the recirculating cooler = rOFF
Start the recirculating cooler
Ask for actual condition (Start/Stop)

37

Remote control
Command Parameter Response of recirculating cooler
out_sp_00

in_sp_00
in_sp_01 no Ask for high temperature value
in_sp_02 no Ask for low temperature value
out_sp_03

in_sp_03
out_sp_07

in_sp_07

out_sp_08
in_sp_08

in_pv_00 no Ask for actual feed temperature
in_pv_01 no Ask for actual temperature of external sensor

xx.x
no

xxx

no
xx.xx

xx.xx

xx.xx
xx.xx

Set working temperature value
Ask for working temperature value

Set control ratio for feed/return flow temperature
Ask for actual control ratio

Maximum value of the internal temperature in case of
external control (HL - High Limit)
out = set; in = ask

Minimum of the internal temperature in case of external
control (LL - Low Limit)
out = set; in = ask

in_pv_02 no Ask for actual heater capacity
in_pv_03 no Ask for actual return temperature
in_pv_04 no Ask for actual safety temperature
out_par_06

in_par_06
out_par_07

in_par_07
out_par_08

in_par_08
out_par_09

in_par_09
out_par_10

in_par_10

out_par_11
in_par_11

x:x
x:x

xx.xx
xx.xx

xx.xx
xx.xx

xx.xx
xx.xx

xx.xx
xx.xx

xx.xx
xx.xx

Control parameter Xp of the internal controller
out = set; in = ask

Control parameter Tn of the internal controller
out = set; in = ask

Control parameter Tv of the internal controller
out = set; in = ask

Control parameter Xp of the external controller
out = set; in = ask

Control parameter Xpu of the cascaded P-controller in case
of external control
out = set; in = ask

Control parameter Tn of the external controller
out = set; in = ask

out_par_12
in_par_12

38

xx.xx
xx.xx

Control parameter Tv of the external controller
out = set, in = ask

Recirculating coolers

9.3. Status messages

Message Description - Recirculating cooler ...
00 MANUAL STOP ... in condition "OFF" (LOCAL)

01 MANUAL START

... in keypad control mode (LOCAL)

02 REMOTE STOP ... in condition "rOFF" (RS 232)
04 REMOTE START ... in remote control mode (RS 232)

9.4. Error messages

Message Description

-01 WORKING PROCESSOR ALARM Internal error

-02 EXCESS TEMPERATURE ALARM High temperature alarm

-03 LOW TEMPERATURE ALARM Low temperature alarm

-04 SENSOR DIFFERENCE ALARM Sensor difference alarm



Safety sensor

Feed

C25

-05 LOW LEVEL ALARM Low liquid level alarm

-06 PROCESSOR COMMUNICATION

Internal error

ERROR

-07 I2C-BUS WRITE ERROR Internal error

-08 I2C-BUS READ ERROR Internal error

-09 I2C-BUS READ/WRITE ERROR Internal error

-10 COMMAND NOT ALLOWED IN

Invalid command in current operating mode

CURRENT OPERATING MODE

-11 EXTERNAL SENSOR ALARM Error on external Pt100 sensor

-12 VALUE TOO SMALL Value too small

-13 VALUE TOO LARGE Value too large

-14 INVALID COMMAND Invalid command

-15 WARNING: STAND-BY PLUG IS
MISSING

-16 WARNING: VALUE EXCEEDS
TEMPERATURE LIMITS

External stand-by plug is missing
(see page 36)

Value lies outside the permissible range for
the safety temperature limits. But value is
stored anyway.

-17 PUMP ERROR Pump disconnection

-18 COMPRESSOR ERROR Compressor disconnection

-19 HEATER TRIAC SHORTED Heater disconnection

39

Menu functions

10. Menu functions

Set the parameters for the recirculating cooler via the

configuration or calibration level.

10.1. Selecting/exiting the configuration level

+ 1x

+ 1x

+

10.2. Setting the parameters

+ 1x

ACTUAL

+3x

ACTUAL

SET

SET

Simultaneously press the "MENUE" key (4.2)
and

the edit key " " to select the configuration level
or

the edit key " " to exit the configuration level.
Select the menu items of the configuration level one by

one by pressing simultaneously the menu key and one
of the cursors.

Example: Baud rate

 Select the configuration level by pressing the keys

simultaneously.

 Select the menu item by pressing simultaneously

the menu key and one of the cursors.
(example: press the cursor key " " 3 times).

 Set the baud rate (4800 Bauds) with the edit keys

" or " ").

("

 Press the enter key to store the new parameter.

40

10.3. Adjustable parameters

Recirculating coolers

ACTUAL

SET

ACTUAL

SET

ACTUAL

SET

Set the parameters for the following menu items in the
configuration level:

OP - Operating mode
0 = Keypad control
1 = Remote control via RS 232
2 = Control via programmer input (O)

HAnd - Handshake of the serial interface
0 = XOn/XOff, software handshake
1 = RTS/CTS, hardware handshake *

PAr - Parity bits of the serial interface
0 = no
1 = odd
2 = even *

ACTUAL

SET

ACTUAL

SET

ACTUAL

SET

bAud - Baud rate of the serial interface
1200 Bauds
2400 Bauds
4800 Bauds*
9600 Bauds

E_Sb - External stand-by for emergency switch-off
0 = stand-by input is ignored *
1 = stand-by input is active
(Stand-by input - see page 36)

(* factory setting)

Pr-t - Programmer input type
0 = Voltage 0 to 10 V

1 = Current 0 to 24 mA

41

Menu functions

ACTUAL

10.4. Selecting/exiting the calibration level

+ 2x

+ 2x

+

SET

Attention:
The following menu point Cont is only adjustable via the
configuration level if the status is „OFF“.
On a unit which is switched on this status is reached by
switching on/off at the mains switch (1).

Cont - Control mode
0 = internal control
1 = external control (with an external
sensor connected to "N")

Simultaneously press the
"MENUE" key (4.2) and twice

the edit key " " to select the calibration level
or

the edit key " " to exit the calibration level.
Select the menu items of the calibration level one by one

by pressing simultaneously the menu key and one of the
cursors.

10.5. Calibration

42

ACTUAL

SET

Ad E - Calibration of external sensor

 Connect a Pt100 sensor to the connector (N), immerse

into the calibration bath. Use a calibration thermometer
and measure the bath temperature.
Adjust the external sensor to this value (example: 20.8 °C).

 Press the setpoint key (E).

Follow the instructions under section 6.3.1. page 27





ACTUAL

ACTUAL

ACTUAL

SET

SET

SET

Recirculating coolers

Ad¯P - Calibration of programmer input:
Highest value = 80 °C

AdP - Calibration of programmer input:

Lowest value = -20 °C

Calibration procedure:

 In the configuration level, set the programmer input

type to allow control via an external programmer.
0 = Voltage 0 to 10 V
1 = Current 0 to 24 mA

 Connect an external programmer to the connector (O).
 Set the external programmer to the highest

temperature value.

ACTUAL

SET

 In the calibration level, select the item Ad

the highest temperature value
(example: 80 °C).

P and set

¯

 Press the setpoint key (E).

Follow the instructions under section 6.3.1.
page 27







Do not alter any settings on either of the units as long

as the display "Ad¯P" is blinking.

43

Menu functions

ACTUAL

SET

 Set the external programmer to the lowest temperature

value.

 In the calibration level, select the item Ad

the lowest temperature value (example: -20 °C).
 Press the setpoint key (E).

Follow the instructions under section 6.3.1.
page 27.







P and set

 Do not alter any setting on either of the units as long as

the display "Ad_P" is blinking.

 The lowest programmer value of -20 °C, and the

highest value of 80 °C correspond now to the
respective values of the recirculating cooler.

Example:

Programmer Recirculating cooler

-99.9 °C -20 °C

- 50 °C -10 °C
0 °C 0 °C
50 °C 10 °C
100 °C 20 °C
200 °C
300 °C
400 °C

40 °C
60 °C

80 °C

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11. 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.
Service and repair work may be performed only by authorized electricians.

In order to maintain a good condition of the cooling
compressor, the condenser should be checked for
contamination in regular intervals.

3

2

4

5

1

0

6

 Switch the unit off, disconnect the power plug.
 Hold the venting grid, pull out and remove.

Recirculating coolers

MAX

 Remove the dirt from the condenser with a vacuum

cleaner.

MIN

 Replace the venting grid.

The unit is ready to operate again.

Cleaning:
Clean the outside of the unit using a wet cloth and low surface tension

water.
The recirculating cooler 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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