Julabo MA-4 User manual

English
Operating Manual
Heating Circulators
MA-4 MA-6
MA-12 MA-26
JULABO USA, Inc.
884 Marcon Boulevard
Allentown, PA 18109
Phone: [phone]
Fax: [phone]
info.us@ julabo.com
www.julabo.com
19530347-V3.doc 15.02.16

Operating manual
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.
1.953.0347-V3 02/16 Printed in Germany Changes without prior notification reserved
Important: keep operating manual for future use
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TABLE OF CONTENTS
Operating manual ..........................................................................................................5
1. Intended use ..........................................................................................................5
1.1. Description .........................................................................................................5
2. Operator responsibility – Safety recommendations ...............................................6
2.1. Disposal..............................................................................................................8
2.2. Technical specifications .....................................................................................9
Operating instructions ..................................................................................................11
3. Safety notes for the user ......................................................................................11
3.1. Explanation of safety notes ..............................................................................11
3.2. Explanation of other notes ...............................................................................11
3.3. Safety recommendations .................................................................................11
4. Operating controls and functional elements.........................................................14
4.1. Circulator ..........................................................................................................14
5. Preparations .........................................................................................................16
5.1. Installation ........................................................................................................16
5.2. Bath fluids.........................................................................................................16
5.3. Temperature application to external systems ..................................................17
5.3.1. Tubing ......................................................................................................18
5.4. Filling / draining ................................................................................................19
5.5. Countercooling .................................................................................................19
6. Operating procedures ..........................................................................................21
6.1. Power connection.............................................................................................21
6.2. Switching on / Start – Stop ...............................................................................21
6.2.1. Switching on the circulator .......................................................................21
7. Setting of temperatures ............................................................................22
7.1. 1-setpoint mode / Direct setting of temperatures .............................................22
7.2. Using the pre-setting in the menu ........................................................22
8. Safety installations, warning functions .....................................................24
8.1. Excess temperature protection ........................................................................24
8.1.1. Early warning system, low level protection ..............................................25
8.2. Switch-over from warning to shutdown function...............................................26
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Operating manual
8.3. Over and Sub temperature warning function ...................................................27
9. Menu functions.........................................................................................28
9.1. MENU PUMP – Setting of pump pressure.......................................................29
9.2. MENU Configuration ........................................................................................30
9.2.1. Configuration of the mode of the key ........................................... 31
9.2.2. Remote control: activate – deactivate......................................................31
9.2.3. Automatic / non-automatic start mode .....................................................31
9.2.4. Reset - Factory setting.............................................................................32
9.3. MENU Control parameters – Xp, Tv, Tn ..........................................................32
9.4. MENU SERIAL - BAUDRATE, PARITY, HANDSHAKE ..................................34
9.5. MENU ATC - Absolute Temperature Calibration .............................................35
9.5.1. ATC STATUS - YES / NO........................................................................37
9.5.2. ATC - TYPE: 1 -/ 2 -/ 3 POINT .................................................................37
9.5.3. Example: 3-point calibration for internal control...................................... 38
9.6. MENU LIMITS ..................................................................................................40
10. Troubleshooting guide / error messages .............................................................41
11. Electrical connections ..........................................................................................43
12. Remote control.....................................................................................................44
12.1. Setup for remote control ..............................................................................44
12.2. Communication with a PC or a superordinated data system.......................44
12.3. List of commands.........................................................................................45
12.4. Status messages .........................................................................................46
12.5. Error messages............................................................................................46
13. JULABO Service – Online remote diagnosis .......................................................48
14. Cleaning / repairing the unit .................................................................................49
15. WARRANTY PROVISIONS .................................................................................50
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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,
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
PID2
ATC3
RS232
PUMP
SMART
The circulators are operated via the splash-proof keypad. The implemented
microprocessor technology allows to set and to store different values that
can be indicated on the MULTI-DISPLAY (LED). Three menu keys facilitate
adjusting setpoints, warning and safety functions and menu functions.
The PID temperature control adapts the heat supplied to the thermal
requirements of the bath.
Absolute Temperature Calibration (ATC3) provides a high temperature
stability in the bath. With the 3-point calibration an offset is adjusted at three
temperatures to ensure an accurate temperature pattern at the selected spot
in the bath over the full temperature range.
Electrical connections:
The serial interface RS232 allows modern process technology without
additional interface.
Alarm output for external alarm message or control of JULABO refrigerating
baths or solenoid valve (cooling water).
The excess temperature protection conforming to IEC 61010-2-010 is a
safety installation independent from the control circuit. This protection can be
indicated and set on the MULTI-DISPLAY (LED).
The early warning system for low level signals that bath fluid needs to be
refilled before the low level protection conforming to IEC 61010-2-010
causes a complete shut-down of the main functional elements.
The pump capacity (electronically adjustable via the motor speed) enables to
adapt to varying conditions for internal and external temperature
applications.
The circulator conforms to the relevant requirements specified by European
guidelines.
5

Operator responsibility – Safety recommendations
2. Operator responsibility – Safety 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.
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 circulator
may be operated only by persons who are absolutely familiar with these materials and the
circulator. 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 JULABO USA, Inc.
884 Marcon Boulevard
Allentown, PA 18109
Phone:[phone]
Fax: [phone]
info.us@ julabo.com
www.julabo.com
Safety instructions for the operator:
You have received a product designed for industrial use. Nevertheless, avoid strikes to the
housing, vibrations, damage to the operating-element panel (keypad, display), and
contamination.
Make sure the product is checked for proper condition regularly (depending on the
conditions of use). Regularly check (at least every 2 years) the proper condition of the
mandatory, warning, prohibition and safety labels.
Make sure that the mains power supply has low impedance to avoid any negative effects
on instruments being operated on 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 affect other devices with components sensitive to magnetic fields
(e.g., monitors). We recommend maintaining a minimum distance of 1 m.
Permissible ambient temperature: max. 40 °C, min. 5 °C.
Permissible relative humidity: 50% (40 °C).
Do not store the unit in an aggressive atmosphere.
Protect the unit from contamination.
Do not expose the unit to sunlight.
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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 can be filled with flammable materials. Fire hazard!
There might be chemical dangers depending on the bath medium used.
Observe all warnings for the used materials (bath fluids) and the respective instructions
(safety data sheets).
Insufficient ventilation may result in the formation of explosive mixtures. Only use the unit in
well ventilated areas.
Only use recommended materials (bath fluids). Only use non-acid and non corroding
materials.
When using hazardous materials or materials that could become hazardous, the operator
must affix the enclosed safety labels to the front of the unit so they are highly visible:
If this unit is intended for use within the United States of America, all 3 warning labels must
be affixed to the housing of the unit prior to use.
Directions for the positioning of the individual warning labels are enclosed with the warning
labels included in the delivery.Warning labels must be easily visible to users.
1 Warning label W00: Colors: yellow, black
Danger area. Attention! Observe instructions.
(operating manual, safety data sheet)
2
or
Mandatory label M018: Colors: blue, white
Carefully read the user information prior to beginning operation.
Scope: EU
2 Semi S1-0701 Table A1-2 #9
Carefully read the user information prior to beginning operation.
Scope: USA, NAFTA
3 Warning label Proposition 65
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 W26: Colors: yellow, black
Hot surface warning.
(The label is put on by JULABO)
Observe the instructions in the manuals for instruments of a different make that you connect to
the circulator, particularly the respective safety recommendations. Also observe the pin
assignment of plugs and technical specifications of the products.
7

Operator responsibility – Safety recommendations
2.1. Disposal
The circulator contains a back-up battery that supplies voltage to memory chips when the unit
is switched off. Do not dispose of the battery with household waste!
Depending on battery regulations in your country, you might be obliged to give back used or
defect batteries to gathering places.
The product may be used with oil as bath fluid. These oils fully or partially consist of mineral oil
or synthetic oil. For disposal, observe the instructions in the safety data sheets.
Contact an authorized waste management company in your country.
Disposal with household waste (unsorted waste) or similar collections of
municipal waste is not permitted!
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2.2. Technical specifications
Open Bath Circulators
MA-4
MA-6
MA-12
MA-26
Working temperature range
°C
20 ... 200
20 ... 200
20 ... 200
20 ... 200
Temperature stability
°C
±0,01
±0,01
±0,01
±0,01
Bath opening (WxL)
cm
13x15
13x15
22x15
22x30
Bath depth
cm
15
20
20
20
Filling volume from ... to
liters
3 ... 4,5
4,5 ... 6
7,5 ... 12
18 ... 26
Overall dimensions (WxDxH)
cm
21x42x38
21x43x42
30x43x45
36x61x45
Weight
kg
9,6
12,5
13,0
26,0
All measurements have been carried out at: rated voltage and frequency
operating temperature: 70 °C ambient temperature: 20 °C bath fluid: water
Technical changes without prior notification reserved.
Mains power connection
V; Hz
208 - 230; 50/60 (perm. range)
Current draw (at 208V)
A
8
Current draw (at 230V)
A
9
Mains power connection
V; Hz
100 - 115; 50/60 (perm. range)
Current draw (at 100V)
A
8
Current draw (at 115V)
A
9
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Temperature selection
digital
via keypad indication on
MULTI-DISPLAY(LED)
remote control via personal computer
indication on monitor
Temperature indication
MULTI-DISPLAY (LED)
Resolution (-9.99 …. +99.99 = 0.01)
°C
0.01 / 0.1
Absolute Temperature Calibration
°C
±3
Temperature control PID
Heater wattage (at 230 V)
kW
2,0
Heater wattage (at 115V)
kW
1,0
Electronically adj. pump capacity
stages
1 ... 4
Flow rate max.at 0 bar
l/min
11 ... 16
Pressure max. max. at 0 l
bar
0.23 ... 0.45
Electrical connections:
External alarm device
Vdc/mA
24-0 / max. 25
Computer interface
RS232
Ambient temperature
°C
5 ... 40
9

Operator responsibility – Safety recommendations
Safety installations according to IEC 61010-2-010:
Excess temperature protection adjustable from 0 °C ... 230 °C
Low liquid level protection float switch
Classification according to DIN 12876-1 class III
Supplementary safety installations
Early warning system for low level float switch
High temperature warning function optical + audible (in intervals)
Low temperature warning function optical + audible (in intervals)
Supervision of working sensor plausibility control
Reciprocal sensor monitoring between
working and safety sensors difference >35 K
Alarm message optical + audible (permanent)
Warning message optical + audible (in intervals)
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.
Protection 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).
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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 i
s 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.
This icon is used in the operating instructions to indicate flashing values or
parameters which have to be set or confirmed.
3.3. Safety recommendations
Follow the safety instructions to avoid personal injury and property damage.
Also, the valid safety instructions for workplaces must be followed.
•Only connect the unit to a power socket with an 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 unit on an even surface on a base made of nonflammable
material.
11

Safety notes for the user
•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.
•Set the excess temperature safety installation at least 25 °C below the fire
point of the bath fluid.
•Observe the limited working temperature range when using plastic bath
tanks.
•Never operate the unit without bath fluid in the bath.
•Pay attention to the thermal expansion of bath oil during heating to avoid
overflowing of the fluid.
•Prevent water from entering the hot bath oil.
•Do not drain the bath fluid while it is hot!
Check the temperature of the bath fluid prior to draining (e.g., by switching
the unit on for a short moment).
•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 units.
•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 units with damaged mains power cables.
•Repairs are to be carried out only by qualified service personnel.
Some parts of the bath tank and the pump connections may become
extremely hot during continuous operation. Therefore, exercise particular
caution when touching these parts.
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
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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.
WARNING
This product contains chemicals known to the state of California to cause
cancer, birth defects or other reproductive harm.
13

Operating controls and functional elements
4. Operating controls and functional elements
4.1. Circulator
Front view Rear view
1 Mains power switch, illuminated
Navigation keys
2 1. Key: >OK< Start / Stop (pump / heater )
2. >OK< in the menu Menu item / select submenu for setting
Save set value
Save selected parameter
A beep signals the end of setting
After the actions Start, Stop and change from VFD Display to
standard display the key is locked for a short time.
The above graph “front side” shows an example for standard display.
3 1. Key: >Return< Stop (pump / heater )
2. >Return< in the menu one menu level down
Correction function for parameters or values (prior to OK)
immediately back to standard display
- icon for „keep key pressed down“.
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4 1. Key: >Up / Down <temperature – increase/decrease setpoint
Push key quickly for single steps,
Keep key pressed for fast change.
2. >Up/Down< in the menu selection of menu items / parameters
Navigation aids
Flashing segments show the position
within the structure of the menu.
Item „P“ flashes simultaneously in the
submenu.
Menu keys
5 Key: start the menu > warning and safety values<
6 Key: start the menu >temperature setpoints<
7 Key: display of MENU structure
10
MULTI-DISPLAY (LED) temperature indication, menu indication
11
Control indicator –Heating
12
Control indicator – Cooling (without function)
13
Control indicator – Alarm
14
Adjustable excess temperature protection according to IEC 61010-
2-010
15
Socket: control cable of JULABO refrigerated circulator
or output for alarm messages
16
RS232
Interface RS232: remote control via personal computer
18
Mains circuit breakers (resettable) 15 A
20
Mains power cable with plug
15

Preparations
5. Preparations
5.1. Installation
•Place the circulator in an upright position.
•Place the unit on an even surface on a pad made of non-
flammable material
5.2. Bath fluids
Caution:
Carefully read the safety data sheet of the bath fluid used, particularly with
regard to the fire point!
If a bath fluid with a fire point of ≤65 °C is used, only supervised operation is
possible.
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
See website for list of recommended bath fluids.
ATTENTION: The maximum permissible viscosity is 50 mm2/s
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Caution:
Fire or other dangers when using bath fluids that are not recommended:
Please contact JULABO before using other than recommended bath fluids.
Use only nonacidic and noncorrosive bath fluids.
JULABO assumes no liability for damage caused by the selection of an
unsuitable bath liquid.
Unsuitable bath fluids are fluids which, e.g.,
•are highly viscous
(much higher than recommended at the respective working temperature)
•have a low viscosity and have creep characteristics
•have corrosive characteristics or
•tend to crack.
•No liability for use of other bath fluids!
5.3. 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
(24a) with the cap nut.

feed return
The circulator is used for temperature application to
external, closed systems (loop circuit) with simultaneous
temperature application in the circulator bath.
Connecting the external system
•Unscrew the collar nuts from the pump connector (24a).
•Slide the tubing onto the pump connector for feed (24a)
and return flow (24b) and secure with hose clamps.
17

Preparations
5.3.1. Tubing
Recommended tubing:
Order No. Length
Temperature range
8 930 008 1 m
CR® tubing 8 mm inner dia.
-20 °C to 120 °C
8 930 010 1 m
CR®tubing 10 mm inner dia.
-20 °C to 120 °C
8 930 108 1 m
Viton tubing 8 mm inner dia.
-50 °C to 200 °C
8 930 110 1 m
Viton tubing 10 mm inner dia.
-50 °C to 200 °C
8 930 410 1 m
Insulation for tubing 8 mm or
10 mm inner dia.
-50 °C to 100 °C
8 970 480
2 tubing clamps. size 1, tubing 8 mm inner dia.
8 970 481
2 tubing clamps. size 2, tubing 10 or 12 mm inner dia.
8 930 209 0.5 m
8 930 210 1.0 m
8 930 211 1.5 m
8 930 214 3.0 m
Metal tubing, triple insulated,
M16x1 *
-100 °C to +350 °C
8 930 220 0.5 m
8 930 221 1.0 m
8 930 222 1.5 m
8 930 223 3.0 m
Metal tubing, insulated, M16x1 *
-50 °C to +200 °C
*) Adapter for metal tubing M10x1 on M16x1 Order No. 8 970 444
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.
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5.4. Filling / draining
Notice:
Pay attention to the thermal expansion of bath oil during heating to avoid
overflowing of the liquid.
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).
Always turn off the unit and disconnect the mains cable from the power
source before cleaning the unit, or before moving the unit.
Store and dispose the used bath fluid according to the laws for environmental
protection.
Filling
Take care that no liquid enters the interior of the circulator.
•Recommended maximum filling level with water as bath fluid:
30 mm below the tank rim
•Recommended maximum filling level with bath oils:
40 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.
The circulator provides an early warning system for low level
that may be triggered when changing samples in the bath.
Draining
•Turn the unit off with the mains switch.
•Place the heating circulator near the rim of the table. Use a
suitable vessel as recipient for the bath fluid.
•Unscrew the drain plug on the front of the bath tank to drain
the bath.
5.5. Countercooling
Notice:
Securely attach all tubing to prevent slipping.
Observe the laws and regulations of the water distribution company valid in the
location where the unit is operated.
19

Preparations
15
A
M
P
15
A
M
P
25a 25b
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 100 ml/minute is sufficient to
compensate for the characteristic temperature.
For applications near ambient temperature (20 °C), the
cooling water temperature should at least be 5 °C below the
working temperature
RS 232
15
A
M
P
15
A
M
P
V
JULABO MVS
27
25a
25b
26
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.
For applications requiring constant
near-ambient temperature, tap water is
thus only used in small amounts.
The circulator provides the necessary
control pulse via the connector (15).
Cooling coil connectors
(25a, 25b)
Order No. Description
9 790 000 MVS controller
8 980 700 Solenoid valve
NOTE: Immersion coolers are used for countercooling instead of tap water in
applications below room temperature.
Order No. Description
9 650 820 FT200
9 650 840 FT400
8 970 400 Clamp for cooler probe for stainless steel or
plexiglass bath tanks
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.
20