Julabo PRESTOPLUS LH41 User manual

19532780.doc Print date: 10.06.09
Operating Manual
Highly Dynamic Temperature Control System
•with integrated programmer
LH 40
air-cooled
LH41
water-cooled
Version: V45D-01
JULABO WEST
2575 Pioneer Avenue, Suite 102
Vista, CA 92081
[phone]
[phone]
|info @ julabo.com
Þwww.julabo.com
JULABO EAST
754 Roble Road, Suite 180
Allentown, PA 18109
[phone]
[phone]
|info @ julabo.com
Þwww.julabo.com

2
Congratulations!
You have made an excellent choice.
JULABO thanks you for the trust you have placed in us.
This operating manual has been designed to help you gain an understanding of the 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.
Quality Management System
ISO 9001
2000
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The JULABO Quality Management System:
Temperature control devices for research and industry are developed, produced,
and distributed according to the requirements of DIN EN ISO 9001:2000.
Certificate Registration No. 01 100044846
Unpacking and inspecting
Unpack the unit 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.
1.953.2780BU0 05/09 Printed in Germany Changes without prior notification reserved

3
TABLE OF CONTENTS
OPERATING MANUAL .......................................................................................................5
1. INTENDED USE....................................................................................................5
1.1. Description.............................................................................................................5
2. OPERATOR RESPONSIBILITY –SAFETY INSTRUCTIONS...............................6
2.1. Disposal.................................................................................................................8
2.2. Technical specifications.........................................................................................9
2.3. Cooling water connection....................................................................................12
OPERATING INSTRUCTIONS .........................................................................................13
3. OPERATING CONTROLS AND FUNCTIONAL ELEMENTS..............................13
3.1. The Presto Plusprinciple with closed external system........................................17
4. SAFETY NOTES FOR THE USER......................................................................18
4.1. Explanation of safety notes .................................................................................18
4.2. Explanation of other notes...................................................................................18
4.3. Safety instructions ...............................................................................................18
5. PREPARATIONS ................................................................................................21
5.1. Bath fluids............................................................................................................21
5.2. Tubing..................................................................................................................23
5.3. Installation ...........................................................................................................24
5.4. Connect the external system...............................................................................24
5.4.1. Cooling water connection LH41....................................................................26
5.5. Power connection................................................................................................27
5.6. Filling...................................................................................................................27
5.6.1. Filling of external, closed systems................................................................28
5.7. Degasifying..........................................................................................................30
5.8. Draining...............................................................................................................31
6. OPERATING PROCEDURES.............................................................................32
6.1. Switching on / Selecting the language.................................................................32
7. MANUAL OPERATION........................................................................................33
7.1. Start - Stop ..........................................................................................................33
7.2. Direct setting of the working temperature............................................................34
7.3. Settings in the SET menu....................................................................................34
7.3.1. Setting the working temperature...................................................................34
7.3.2. Warning functions.........................................................................................35
7.3.3. Setting the pump pressure stage..................................................................36
7.4. Setting the safety temperature (with shutdown function).....................................36
7.5. Internal / external control.....................................................................................38
8. MENU FUNCTIONS............................................................................................38

4
8.1. Configuration.......................................................................................................40
8.2. Control parameters..............................................................................................43
8.3. Start of a profile...................................................................................................45
8.3.1. Interrupting a profile...................................................................................... 47
8.4. Integrated programmer........................................................................................48
8.5. Analog inputs/outputs..........................................................................................51
8.6. Limits...................................................................................................................54
8.7. Interface...............................................................................................................54
8.8. Sensors ...............................................................................................................55
8.9. Pump...................................................................................................................56
9. TROUBLESHOOTING GUIDE / ERROR MESSAGES....................................... 57
10. ELECTRICAL CONNECTIONS...........................................................................59
11. REMOTE CONTROL...........................................................................................62
11.1. Setup for remote control...................................................................................... 62
11.2. Communication with a PC or a superordinated data system...............................63
11.3. List of commands ................................................................................................64
11.4. Status messages / error messages..................................................................... 67
12. CLEANING THE UNIT.........................................................................................69
13. MAINTAINING / REPAIRING THE UNIT............................................................. 71
14. WARRANTY PROVISIONS.................................................................................73

5
Operating manual
1. Intended use
highly dynamic temperature control systems have been designed for
external temperature application to liquids. They offer rapid heating and
cooling, wide working temperature ranges without changing fluids as well
as highest performance with a small footprint.
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
•Besides the cooling unit, the main functional elements are the heater, circulation pump and control
electronics. Via an external Pt100 control sensor, a self-optimizing, electronic proportional
temperature control (PID characteristic) adapts the heat supplied to the thermal requirements of
the external system.
•The high pump capacity can be reduced by regulating the motor speed in five grades. It may thus
be adapted to sensitive vessels.
•LH40: The cooling unit may be cooled with air.
LH41: The cooling unit may be cooled with water.
•Setting is rapid and simple using the splash-proof keypads. The operating elements consist of the
local operating board with a bright VFD-Info-Display, as well as the removable control module RD
connected with a cable.
The microprocessor technology allows four temperature values to be stored and indicated on the
DIALOG-DISPLAY (LCD) of the control module RD: working temperature, high and low
temperature warning limits as well as pump pressure stage.
•The digital RS232 / RS485 port permits modern process engineering without additional interface.
•The excess temperature protection (safety temperature), a safety feature functioning independent
of the regulator circuit, is adjusted and indicated via the VFD-Info-Display.
•The integrated programmer allows programming of setpoint and time values for six temperature
profiles.
•The following analog sockets are available:
- The REG+E-PROG socket for setpoint selection via an external, analog programmer.
At the same time, this socket provides three analog outputs for temperature recorders.
- The external Pt100 socket for external control.
- The alarm output for an external signal.
- The stand-by input for external emergency switch-off.

Operator responsibility –Safety instructions
6
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 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 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: JULABO WEST
2575 Pioneer Avenue, Suite 102
Vista, CA 92081
[phone]
[phone]
|info @ julabo.com
Þwww.julabo.com
JULABO EAST
754 Roble Road, Suite 180
Allentown, PA 18109
[phone]
[phone]
|info @ julabo.com
Þwww.julabo.com
Safety instructions for the operator:
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 the
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.
Appropriate operation
Only qualified personnel is authorized to configure, install, maintain, or repair the unit.
Persons who operate the circulator must be trained in the particular tasks by qualified personnel. The

7
summarized user guidance (short manual) and the specification table with information on individual
parameters are sufficient for this.
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). Do not use poisonous, vitriolic or corrosive bath fluids.
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 corresponding safety instructions. Also observe the pin assignment of plugs
and technical specifications of the products.

Operator responsibility –Safety instructions
8
2.1. Disposal
The product may be used with oil as bath fluid. These oils fully or partially consist of mineral oil or
synthetic oil. For disposal, follow the instructions in the material safety data sheets.
This unit contains the refrigerant R404A, which at this time is not considered harmful to the ozone
layer. However, over the long operating period of the unit, disposal rules may change. Therefore, only
qualified personnel should handle the disposal.
Valid in EU countries
Directive 2002/96/EC of the European Parliament and of the Council of 27
January 2003 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!

9
2.2. Technical specifications
LH 40 LH 41
Mains power connection
230V/50Hz
V / Hz 207-253/50 207-253/50
Current draw (at 230 V) A 15 14
Mains power connection (GB)
230V/50Hz
V / Hz 207-253/50 207-253/50
Current draw (at 230 V) A 13 12
Working temperature range °C -40 ... 250 -40 ... 250
Temperature stability
°C ±0.01 ... ±0.05 ±0.01 ... ±0.05
Cooling capacity
pump pressure stage 1
pump pressure stage 5
(bath liquid: Thermal / Ethanol)
°C
kW
kW
200 100 // 20 0 -20
1.6 1.2 // 0.99 0.8 0.38
1.6 1.2 // 0.89 0.75 0.28
200 100 // 20 0 -20
1.7 1.5 // 1.1 0.9 0.4
1.7 1.5 // 1.0 0,85 0.3
Cooling compressor 1-stage air-cooled water-cooled
Refrigerant R404A R404A
Cooling water: Flow rate at 15
°C inlet temperature l/min --------------- 1.2
Heater wattage
Heater wattage (GB) kW kW 2.6 2.0 2.6 2.0
Pressure pump, adjustable
pressure min ... max. at 0 liter
discharge, max. at 0 bar
grade
bar
l/min
1
0.5
16
2
0.7
19
3
1.1
23
4
1.3
26
5
1,7
30
maximum permissible viscosity is 50 mm2 / s.
Noise level, 1 m distance dBA 73 61
Ambient temperature °C 5 ... 40 5 ... 40
Filling volume
Heat exchanger/Reservoir
Liters
Liters 4,0 2.5 / 0.6 … 1.4 4,0 2.5 / 0.6 … 1.4
Overall dimensions (WxDxH) cm 30 x 49 x 64 30 x 49 x 64
Weight kg 72 73
All measurements have been carried out at:
rated voltage and frequency ambient temperature: 20 °C
Technical changes without prior notification reserved.
Pump data in relation to fluids with a specific density of 1 kg/dm3

Operator responsibility –Safety instructions
10
LH 40 LH 41
Mains power connection
230V/60Hz V / Hz 207-253/60 207-253/60
Current draw (at 230 V) A 16 14
Working temperature range °C -40 ... 250 -40 ... 250
Temperature stability
°C ±0.01 ... ±0.05 ±0.01 ... ±0.05
Cooling capacity
pump pressure stage 1
pump pressure stage 5
(bath liquid: Thermal / Ethanol)
°C
kW
kW
200 100 // 20 0 -20
1.6 1.2 // 0.9 0.8 0.38
1.6 1.2 // 0.8 0.7 0.28
200 100 // 20 0 -20
1.6 1.5 // 1.2 1.0 0.49
1.6 1.5 // 1.1 0,9 0.39
Cooling compressor 1-stage air-cooled water-cooled
Refrigerant R404A R404A
Cooling water: Flow rate at 15 °C
inlet temperature l/min --------------- 1.2
Heater wattage kW 2,6 2,6
Pressure pump, adjustable
pressure min ... max. at 0 liter
discharge, max. at 0 bar
grade
bar
l/min
1
0.5
16
2
0.7
19
3
1.1
23
4
1.3
26
5
1,7
30
maximum permissible viscosity is 50 mm2 / s.
Noise level, 1 m distance dBA 73 61
Ambient temperature °C 5 ... 40 5 ... 40
Filling volume
Heat exchanger/Reservoir Liters Liters 4,0 2.5 / 0.6 … 1.4 4,0 2.5 / 0.6 … 1.4
Overall dimensions (WxDxH) cm 30 x 49 x 64 30 x 49 x 64
Weight kg 72 73
All measurements have been carried out at:
rated voltage and frequency ambient temperature: 20 °C
Technical changes without prior notification reserved.
Temperature selection digital
via Removable control module RD indication on DIALOG-Display (LCD)
remote control via personal computer indication on monitor
Temperature indication VFD-Info-Display
DIALOG-DISPLAY (LCD)
Resolution K 0.01 from -9.99 °C to +249.99 °C
Pump pressure display on VFD-Info-Display in five grades
Liquid level display on VFD-Info-Display in five grades
Absolute Temperature Calibration
(ATC1) K ±3
(ATC2) K ±9
Temperature control ICC - Intelligent Cascade Control, self-optimizing
Cascade, parameter can be called-in and modified
Working temperature sensor Pt 100
Safety temperature sensor Pt 100
Electrical connections:
Computer interface RS232 or RS485
Programmer input -100 °C to 400 °C = 0 to 10 V or 0 to 20 mA or 4 to 20 mA
Temperature recorder outputs 0 to 10 V (0 V = -100 °C, 10 V = 400 °C)

11
0 to 20 mA (0 mA = -100 °C, 20 mA = 400 °C)
4 to 20 mA (4 mA = -100 °C, 20 mA = 400 °C)
Stand-by input
External alarm device 24-0 V DC / max. 25 mA
External measurement and control sensor Pt100, 4-lead technique
Control connector (10) Output voltage: 230 V∼/ max. 0.1 A
Safety installations according to IEC 61010-2-010:
Excess temperature protection >TANK< adjustable from 0 °C ... 320 °C
Excess temperature protection >RES< adjustable from 0 °C ... 220 °C
Low level protection float switch
Liquid level display optical, 5-graded
Classification according to DIN 12876-1 class III FL
Supplementary safety installations
High temperature warning function optical + audible (in intervals)
Low temperature warning function optical + audible (in intervals)
Supervision of the working sensor plausibility control
Reciprocal sensor monitoring between
working and safety sensors difference >25 °C
Alarm indication optical + audible (permanent)
Environmental conditions according to IEC 61 010-1:
•Use only indoor.
•Altitude up to 2000 m - normal zero.
•Ambient temperature: see Technical specifications
•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.
•Overvoltage category II
•Pollution degree 2
Caution:
The unit is not suitable for use in explosive atmosphere
Protection class according to IEC 60 529: IP20
The unit corresponds to Class I
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).

Operator responsibility –Safety instructions
12
2.3. Cooling water connection
Cooling water pressure (IN / OUT ) max. 6 bar
Difference pressure (IN - OUT ) 3.5 to 6 bar
Cooling water temperature <20 °C
Notice: Cooling water circuit
Risk of oil leaking from the refrigeration system (compressor) of the recirculating
cooler into the cooling water in case of a fault in the cooling water circuit!
Observe the laws and regulations of the water distribution company valid in the
location where the unit is operated.
Notice:
Danger of corrosion of heat exchanger due to unsuitable quality of cooling
water.
•Due to its high content of lime, hard water is not suitable for cooling and causes
scale in the heat exchanger.
•Ferrous water or water containing ferrous particles will cause formation of rust
even in heat exchangers made of stainless steel.
•Chlorinated water will cause pitting corrosion in heat exchangers made of
stainless steel.
•Due to their corrosive characteristics, distilled water and deionized water are
unsuitable and will cause corrosion of the bath.
•Due to its corrosive characteristics, sea water is not suitable.
•Due to its microbiological (bacterial) 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.
Recommended quality of cooling water:
pH 7.5 to 9.0
Sulfate [SO4 2- ] < 100 ppm
Hydrocarbonate [HCO 3-]/sulfate [SO4 2-] > 1 ppm
Hardness [Ca 2+, Mg 2+]/[HCO 3-] > 0.5
° dH
Alkalinity 60 ppm < [HCO 3-] < 300 ppm
Conductivity < 500 μS/cm
Chloride (Cl -) < 50 ppm
Phosphate (PO4 3-) < 2 ppm
Ammonia (NH3) < 0.5 ppm
Free chlorine < 0.5 ppm
Trivalent iron ions (Fe 3+) < 0.5 ppm
Manganese ions (Mn 2+) < 0.05 ppm
Carbon dioxide (CO2) < 10 ppm
Hydrogen sulfide (H2S) < 50 ppm
Content of oxygen < 0.1 ppm
Algae growth impermissible
Suspended solids impermissible

13
Operating instructions
3. Operating controls and functional elements
Front view
1 Mains power switch,
illuminated
2 Local operating board
3 Socket board
4 Removable control module
RD
5 Filling funnel (hinged)
6 Handle (foldaway)
7 Venting grid, removable
8 Drain with drain port
2 Local operating board
2.1
VFD-Info-Display
Header: Control indicators see section 2.2
Line 1: Actual value Int or Ext
To swap, press the key (see below)
Line 2: Working temp. setpoint, constantly S xxx.xx
or indication of the safety temperature (TANK)
Line 3: Miscellaneous values
To swap, press the key (see below)
or indication of the safety temperature (RES)

Operating controls and functional elements
14
2.2
Control indicators in the header:
Heating / Cooling / Alarm / Remote control
Temperature indication Internal or External actual value
Temperature indication in °C or °F
Display for the adjusted pump pressure stage (five grades),
adjustable via the key .
Liquid level display (five grades)
for the reservoir.
2.3
Key to swap line 3 on the VFD
ID xx Identification no. of control module RD
L xx Capacity in %
E xxx.xx or I xxx.xx Actual value (external or internal)
P x.xx Pump pressure in bar
2.4 Int
S 120.00
E 120.00
Key to swap line 1 on the VFD
Actual value Int or Ext alternating with line 3
2.5
Key to indicate the safety temperature on the VFD
Line 2: TANK - Safety temperature in internal bath
Line 3: RES - Safety temperature in internal reservoir
2.6
Adjustable excess temperature protection (safety temperature)
Used for setting the safety temperature in the internal bath, called
"TANK" on the display
2.7
Adjustable safety temperature.
Used for setting the safety temperature in the internal reservoir,
called "RES" on the display
2.8 Key for automatic filling and air purge of the unit as well as the
connected external system.
3 Socket board
3.1 REG+E-PROG Programmer input and temperature recorder output
3.2 STAND-BY Stand-by input (for external emergency switch-off)
3.3 ALARM Alarm output (for external alarm signal)
3.4 EXT. Pt100
Connector for external measurement and control sensor
3.5 SERIAL
Interface RS232/RS485
3.6 RD Connector: control cable of control module RD

15
4 Control module RD
4.0
Setp: 120.00°C
IntAct 21.00°C
ExtAct: 20.00°C
Control: Intern
DIALOG-DISPLAY (LCD) Standard indication
Line 1: Setpoint in °C
Line 2: Internal actual value in °C
Line 3: External actual value in °C
Line 4: Control type: internal / external control
Indicating messages (e. g. warnings)
4.1
Start / stop key
To switch the circulation pump, heating element and cooling unit.
4.2
>Setp.: 120.00°C
Overt.:255.00°C
Subtmp:-55.00°C
St.Pump: 2
SET Menu Key - Indicating and setting setpoint values
Set the following values:
in Line 1: the working temperature Setp.:
Line 2: the high temperature limit Overt.:
Line 3: the low temperature limit Subtmp:
Line 4: the pump pressure stage St.Pump:
4.3
Control type: internal / external control
To swap, the unit has to be in the STOP MODE.
Indicated in line 4 on the DIALOG-DISPLAY (LCD)
4.4
>Configuration
Control param.
Profile Start
Int. Programmer
MENU key - for selecting the menu functions
(Menu see page 38)
4.5
Cursor keys - Select menu items
4.6
P-key Selecting parameters
4.7 Escape key 1) Cancel entries
2) Return to a higher menu level
4.8
Enter key 1) Store value / parameter
2) Next lower menu level
4.9 .... Numeric keypad: numerals 0 to 9; minus / decimal point

Operating controls and functional elements
16
Rear
10
Control connector
230 V / max. 0.1 A
11 4 Mains circuit breakers
(resettable) 16 A
16
A
M
P
16
A
M
P
16
A
M
P
16
A
M
P
F1
F4F2
F3
F1 and F3 Compressor
F2 and F4 Heater, Pump
12 Mains power cable with plug
13 + 14 Pump connectors Return Feed M16x1
15 Overflow connector M16x1
16 Connector for expansion vessel M16x1
17 + 18
Cooling water connectors LH41 G3/4" external thread
IN - inlet OUT - outlet
19 Castor (at the back)

17
3.1. The Presto Plusprinciple with closed external system
Operating:
The operation of the temperature
system and the indication is
effected via the local control
panel (2) and the removable
operating device RD(4).
Filling :
First connect the external
consumer. The menu option
>Mode< is set on >Fill<. The unit
is filled at the hinged filling funnel
(5) via the internal reservoir (5a).
The bath liquid spreads from
here into the external reservoir
(16a) and into the heat
exchanger (20).
e.g. LH40 and double-sided glass vessel
The filling pipe (25) represents narrows. Therefore the filling should be done slowly. The air from the
heat exchanger (20) escapes via the venting valve. In a first step approximately 2,6 liters of bath liquid
is filled in until the level indication indicates 3 or 4 batons (see –Filling volume- page 27). Then, by
pressing the key an automatic filling and venting mode with activation of the circulating pump
(23) is started. In intervals the tempering liquid is pumped via connection (14) into the external system
(33) and led back into the heat exchanger (20) via connection (13). At the end of the filling process the
menu option >Mode< has to be set on >Sys close<.
Working:
In case of a closed external system the filling pipe (25) remains open and allows a change in volume
of the bath liquid caused by temperature during operation. In case of emergency it has to be possible
that the expanding bath liquid can drain off at the overflow (15) into a suitable vessel. If necessary the
external reservoir (16a) can be mounted at connection (16).
The temperature system can be cooled with air (32 / LH40) or water (LH41). Connect the cooling
water to the lead in for cooling water (18). Lead the outflow for cooling water (17) into the locally
provided drain respectively backflow.
The temperature system is started with the key . The heating (21), the cooling aggregate (22) and
the circulating pump (23) start according to the desired adjustments at the operating device RD (4). In
the line to the pump exit (14) the pump pressure (29) and the actual temperature of the internal control
sensor (28a) is permanently measured. If the temperature control has to be effected externally a
Pt100 external sensor (28b) has to be connected and switched over to external control at the
operating device RD(4).
Safety:
In the internal reservoir (5a) there are the level sensor (26) as well as a safety sensor (27b).
The safety sensor (27a) as high temperature protection is located directly at the heater (21).
If the external circuit is interrupted (e.g. with a shut-off valve), an emergency circuit is maintained via
an internal Bypass (30).

Safety notes for the user
18
4. Safety notes for the user
4.1. 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.
4.2. Explanation of other notes
Note!
Draws attention to something special.
Important!
Indicates usage tips and other useful information.
4.3. Safety instructions
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 freely accessible.
•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.
•Set the safety temperature.
•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.

19
•Prevent water from penetrating into the hot bath oil.
•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).
•Employ 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 damages 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.
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.
Caution:
The temperature controlling i.e. of fluids in a reactor constitutes normal temperature
system 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.

Safety notes for the user
20
Caution: Escape of vapors / gas
The necessity of degassing requires that a closed system is not entirely sealed.
Especially at increased working temperatures vapor / gas may escape.
Ensure sufficient ventilation at the place of installation!
Notice:
When you have finished the application, it is recommended to keep on circulating
the liquid in the bath or the external system for some time. Simultaneously set the
working temperature to +20 °C to allow the temperature in the system to decrease
slowly.
Thus fractional over-heating of the bath liquid is prevented.
Notice:
Check the safety installations at least twice a year!
Excess temperature protection according to IEC 61010-2-010
With a screw driver turn back the adjustable excess temperature protection
until the shut-down point (actual temperature).
Low level protection
To check the function of the float of this unit it cannot be operated manually.
The 5-graded level display should therefore be observed whenever refilling.
If the bath liquid thickens or cracks, the instrument should be cleaned and
checked by qualified personnel.
WARNING
This product contains chemicals known to the state of California to cause cancer,
birth defects or other reproductive harm.