Lauda Alpha A User manual

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YACE0092
Translation of the original operating instructions
LAUDA DR. R. WOBSER GMBH & CO. KG
Pfarrstraße 41/43
97922 Lauda-Königshofen
Germany
release 06/2018 e
replaces release 05/2017 d, 05/2016 c6, 11/2014 c5,
10/2010c4, 10/2009, 11/2008
Telephone: [phone]
Fax: [phone]
E-mail [email protected]
Internet http://www.lauda.de
Operating instructions
Alpha
Immersion Thermostat
A
Heating Thermostats
A 6, A 12, A 24
Cooling Thermostats
RA 8, RA 12, RA 24
Read the instructions prior to performing any task!

Alpha
June 20, 2018/ YACE0092 Prefixed safety notes 5
Prefixed safety notes
Before operating the equipment please read carefully all the instructions and safety
notes. If you have any questions please phone us!
Follow the instructions on setting up, operation etc. This is the only way to avoid in-
correct operation of the equipment and to ensure full warranty protection.
Transport the equipment with care!
Cooling thermostats may NEVER be overturned nor put upside down!
Equipment and its internal parts can be damaged:
by dropping,
by shock.
Equipment must be operated only by technically qualified personnel!
Never operate the equipment without a proper heat transfer liquid!
Never operate the equipment without sufficient water or heat transfer liquid level!
Do not start up the equipment, if:
it is damaged or leaking,
the supply cable is damaged.
Switch off the equipment and pull out the mains plug for:
servicing or repair,
before moving the equipment!
Drain the bath before moving the equipment!
Have the equipment serviced or repaired by properly qualified personnel only!
The Operating Instructions include additional safety notes which are identified by a triangle with an
exclamation mark. Carefully read the instructions and follow them accurately! Disregarding the
instructions may have serious consequences, such as damage to the equipment, damage to
property or injury to personnel.
Product specifications are subject to change without notice!

Alpha
6Table of content June 20, 2018/ YACE0092
Table of content
Prefixed safety notes.....................................................................................................................................5
Table of content.............................................................................................................................................6
1SAFETY NOTES ...........................................................................................................................................8
1.1 GENERAL SAFETY NOTES..........................................................................................................................8
1.2 OTHER SAFETY NOTES..............................................................................................................................9
2BRIEF OPERATING INSTRUCTIONS .......................................................................................................10
3CONTROL AND FUNCTIONAL ELEMENTS.............................................................................................12
4UNIT DESCRIPTION...................................................................................................................................16
4.1 ENVIRONMENTAL CONDITIONS.................................................................................................................16
4.2 TYPES OF UNIT.......................................................................................................................................16
4.3 BATHS ...................................................................................................................................................16
4.4 PUMP.....................................................................................................................................................16
4.5 MATERIALS ............................................................................................................................................17
4.6 TEMPERATURE INDICATION,CONTROL AND SAFETY CIRCUIT......................................................................17
4.7 REFRIGERATION SYSTEM ........................................................................................................................17
4.8 STANDARD ACCESSORIES .......................................................................................................................17
5UNPACKING...............................................................................................................................................18
6PREPARATIONS ........................................................................................................................................19
6.1 ASSEMBLY AND SETTING UP...................................................................................................................19
6.2 FILLING AND EMPTYING...........................................................................................................................22
6.3 HEAT TRANSFER LIQUIDS AND HOSES ......................................................................................................23
6.4 CONNECTION OF EXTERNAL CIRCUITS......................................................................................................24
7STARTING UP ............................................................................................................................................25
7.1 CONNECTION TO THE SUPPLY..................................................................................................................25
7.2 SWITCHING ON .......................................................................................................................................25
7.3 GENERAL KEY FUNCTIONS AND PILOT LAMPS............................................................................................26
7.4 MAIN MENU STRUCTURE..........................................................................................................................27
7.5 TEMPERATURE SETPOINT SETTING SET..................................................................................................28
7.6 AUTOMATIC SHUT-DOWN TIMER ASD.....................................................................................................28
7.7 DEFINING TEMPERATURE LIMITS HIAND LO............................................................................................29
7.8 REFRIGERATION UNIT SUBMENU COOL....................................................................................................29
7.9 OFFSET FOR THE INTERNAL TEMPERATURE PROBE CAL ..........................................................................30
7.10 RESTORING WORKS SETTINGS DEF ........................................................................................................30
7.11 STANDBY STBY......................................................................................................................................31
7.12 SAFETY FUNCTIONS................................................................................................................................31
7.12.1 Safety functions and removal........................................................................................................31
7.12.2 Overtemperature and low level protection.....................................................................................32
7.12.3 Overtemperature and low level protection testing.........................................................................32
7.12.4 Unlock the overtemperature protection.........................................................................................33
7.12.5 Pump-motor supervision: Overload...............................................................................................33
7.12.6 Fault list “Alarms and Errors”.........................................................................................................34
8MAINTENANCE ..........................................................................................................................................35
8.1 CLEANING ..............................................................................................................................................35

Alpha
June 20, 2018/ YACE0092 Table of content 7
8.2 MAINTENANCE........................................................................................................................................35
8.2.1 Service intervals............................................................................................................................35
8.2.2 Testing the heat transfer liquid......................................................................................................36
8.2.3 Maintenance of the refrigeration unit.............................................................................................36
8.3 NOTE ON REPAIR AND CHANGING THE FUSE .............................................................................................37
8.4 DISPOSAL INFORMATION .........................................................................................................................38
8.4.1 Disposal of refrigerant...................................................................................................................38
8.4.2 Disposal of packaging...................................................................................................................38
8.5 ORDERING SPARES AND RATING LABEL....................................................................................................39
9ACCESSORIES...........................................................................................................................................40
10 TECHNICAL DATA AND DIAGRAMS........................................................................................................42
11 INDEX..........................................................................................................................................................47
CONFIRMATION
Explanation of symbols
Caution
This sign is used where there may be injury to person-
nel if a recommendation is not followed accurately or is
disregarded.

Note
Here special attention is drawn to some aspect. May
include reference to danger.

Reference
Refers to other information in different sections.

Alpha
8Safety notes June 20, 2018/ YACE0092
1 Safety notes
1.1 General safety notes
The units are designed for operation with non-flammable liquids to DIN EN 61010-2-010.
A laboratory thermostat is intended for heating, cooling and pumping liquids according to the needs of the
user. This leads to hazards by high or low temperatures, fire, and the general hazards due to the applica-
tion of electrical energy.
The user is largely protected through the application of the appropriate standard specifications.
Further hazard sources may arise from the type of material being thermostated, for example by exceed-
ing or undercutting certain temperature thresholds or by the fracture of the container and reaction with
the heat transfer liquid.
It is not possible to cover all possibilities; they remain largely within the responsibility and the judgement
of the operator.
The unit must only be used as intended and as described in these Operating Instructions. This includes
operation by suitably instructed qualified personnel.
The units are not designed for use under medical conditions according to DIN EN 60601-1 or IEC 601-1!
Classification in accordance with EMC requirements
Unit
Immunity
Emissions class
Customer power supply
Heating and cooling
thermostats
Alpha
Type 1 in accordance
with
DIN EN 61326-1
Emissions Class B
in accordance with
CISPR 11
Only for EU
Domestic connection value ≥
100 A
Type 1 in accordance
with
DIN EN 61326-1
Emissions Class B
in accordance with
CISPR 11
Rest of the world (outside EU)
No limitation
Valid for the USA:
Instructions for Class A digital devices
“This equipment has been tested and found to comply with the limits for Class A digital device, pursuant
to Part 15 of the FCC (Federal Communication Commission) Rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a commercial envi-
ronment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed
and used in accordance with the instruction manual, may cause harmful interference to radio communi-
cations. Operation of this equipment in a residential area is likely to cause harmful interference in which
case the user will be required to correct the interference at his own expense.”
“This device complies with Part 15 of the FCC (Federal Communication Commission) Rules. Operation is
subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this
device must accept any interference received, including interference that may cause undesired opera-
tion.”
Valid for Canada:
“This Class A digital apparatus complies with Canadian ICES-003” (ICES = Interference Causing Equip-
ment Standards).
«Cet appareil numérique de la classe A est conforme à la norme NMB-003 du Canada».

Alpha
June 20, 2018/ YACE0092 Safety notes 9
1.2 Other safety notes
Check the device carefully for shipping damage before putting into operation. Never start a damaged
device!
Only technically qualified personnel must operate the equipment!
Connect the unit only to grounded mains power (PE).
Parts of bath covers (types Alpha RA xx) may reach surface temperatures above 70 °C when oper-
ating at higher temperatures. Take care when touching the device! Danger of burns!
Use suitable hoses (6.3).
Protect tubing with hose clips against slipping off. Avoid kinks in the hoses!
Check hoses from time to time for possible material defects!
Heat transfer hoses and other hot parts must not come into contact with the supply cable!
When using the thermostat as circulation thermostat, failure of hoses may lead to leaking of hot heat
transfer liquid and become a danger to personnel and objects.
When no external consumer is connected to the thermostat the pump outflow must be linked to the
return!
The units are designed for operation with non-flammable liquids to DIN EN 61010-2-010 only.
Always pull out the mains plug before cleaning, maintenance or moving the thermostat!
Repairs on the control unit and/or the refrigeration system must be carried out by properly qualified
personnel only.
Values for temperature control and indicating accuracy apply under normal conditions according to
DIN 12876. High-frequency electromagnetic fields may under special conditions lead to unfavoura-
ble values. This does not affect the safety!
 Depending on the heat transfer liquid used and the mode of operation it is possible for irritating
vapours to be produced. Ensure appropriate ventilation!

Alpha
10 Brief operating instructions June 20, 2018/ YACE0092
2 Brief operating instructions
This brief instruction shall give you the possibility to operate the unit quickly. For safe opera-
tion of the unit it is absolutely necessary to read all the instructions and safety notes careful-
ly!
1.
Assemble unit and add items as appropriate (6).
2.
Fill the unit with corresponding heat transfer liquid.
When starting up the unit, the tubular heater (3) has to be covered with liquid! (6.2).
Heating and immersion thermostats:
Fill the bath with decalcified water (6.3).
Cooling thermostats:
Fill the bath with proper glycol/water mixture (6.3).
The units are designed only for operation with non-flammable liquids to DIN EN 61010-2-010.
Take care of the level of the heat transfer liquid! (6.2).
3.
Connect the unit only to a socket with a protective earth (PE) connection.
Compare the information on the rating label with the supply details.
4. 4
.
Switch the unit on with the front switch .
5. 5
.
Now the display shows the current bath temperature, for example
On warning or error message refer section (7.12).

The overtemperature cut-out point SAFE is fixed at 105 °C and cannot be changed.
However, you can adjust a minimum and maximum operation temperature of the thermostat
(7.7).
Bath temperature
2%3

Alpha
June 20, 2018/ YACE0092 Brief operating instructions 11
(7.7)
(7.9)
Reset to factory default:
Display: dEF
“Enter” pressed for longer than
3 seconds sets back to default:
SEt = 25 °C; Hi = 105 °C;
Lo = -30 °C; Cool= Auto .
(7.6)
(7.5)
(7.8)
Calibrate probe (offset):
Input temperature of reference
thermometer (only offset values
±5 K of actual bath temperature
are accepted).
Display flashes. Set value
with or . Value is accept-
ed after 4 seconds
or proceed immediately
with the key:
(7.10)
Flashing display “00.00”
(preset) for inactive timer or
“hh.mm” for time to initiate
status “Standby”.
Activate timer by setting the
Auto Shut-Down Delay
“hh.mm” with or .
Deactivate timer by setting
“00.00”.
The setting is accepted only by
pressing the key:
Bath temperature
2%3
Display flashes. Set Setpoint
with or . Value is accept-
ed after 4 seconds
or proceed immediately
with the key:
Maximum Temperature
Hi
Minimum Temperature
Lo
Configure Refrig. System
Cool
l
Offset probe
CAL
Settings default
dEF
Timer “Auto Shut Down”
ASd
End
End
Setpoint
SEt
Alarm
nnn
Stand By
StbY
Standard
Alarm
Standby (timer event)
( blinking in timer mode)
Configure Refrigeration System
Default: Auto
Possible settings:
on refrigeration on
Auto refrigeration on if needed
oFF refrigeration off
(3 sec.)

Alpha
12 Control and functional elements June 20, 2018/ YACE0092
3 Control and functional elements
Alpha immersion thermostat
1
2
3
4
5
6
7
8
9
10
1 Mains switch
2 Temperature controller with four segment LED display
3 Heater active (yellow LED is lit)
4 Cooler active (blue LED is lit)
5 Error signal (red LED is flashing)
6 Menu functions, select and Enter keys
7 Tubular heater
8 Temperature probe Pt100
9 Pump outflow with pump outflow reducer
10 Pump housing

Alpha
June 20, 2018/ YACE0092 Control and functional elements 13
Alpha Cooling Thermostat
1
2
3
4
5
6
1 Pump connections: return to bath and pump outflow
2 Bath cover
3 Handle on front and back
4 Removable front cover (Rating label behind front cover (8.5))
5 Grille on both sides
6 Four mounting feet

Alpha
14 Control and functional elements June 20, 2018/ YACE0092
1
2
3
4
5
1 Reset button (press only if the display shows SAFE )
2 Rating label
3 Cooler cable
4 Bath drain nozzle
5 Mains cable

Alpha
June 20, 2018/ YACE0092 Control and functional elements 15
A 6
A 12
A 24
RA 8
RA 12
RA 24

Alpha
16 Unit description June 20, 2018/ YACE0092
4 Unit description
4.1 Environmental conditions
The operation of the thermostats is only allowed under the following conditions as specified in
DIN EN 61010-2-010:2003 and DIN EN 61010-1:2001:
Indoor use.
Operation of the device up to an altitude of 2000 m above sea level.
Foundation must be dense, even, non-slippery and non-flammable.
Keep clear distance (6.1).
Ambient temperature range (10).
Use only within this range for an undisturbed operation.
Mains supply voltage fluctuations (10).
Relative humidity (10).
Transient over voltage according to Installation Categories (Over voltage Categories) II.
Pollution degree: 2.
4.2 Types of unit
The type designation of the Alpha thermostats consists of the letter A or RA (R for identification as low-
temperature unit = cooling thermostat).
The immersion thermostat Alpha (control head) and the type of bath or the refrigeration system respec-
tively.
Examples:
RA 8 = Immersion thermostat Alpha (control head) and refrigeration system with bath of 8 liters max-
imum volume.
A 12 = Control unit Alpha with bath of 12 liters maximum volume.
4.3 Baths
All units -except the immersion thermostat- provide a stainless steel bath. The last two digits of the model
no. correspond to the approximate total volume in liter (for example bath RA 24 = approximately 24 li-
ters).
Part of this volume may be used to insert objects. Be precautious to overflow when inserting large vol-
ume samples!
For the immersion thermostat the bath volume is limited to 25 liters. The bath has to provide a reliable
option to fix the thermostat clamp (wall thickness 10 –30 mm).
4.4 Pump
All units are equipped with a centrifugal immersion pump. The pumps are driven by a shaded pole motor.
The pump outflow connection can be closed without causing any damage to the pump.
The pump flow can be reduced by the pump outflow reducer.
Pump characteristics (10 Technical data).

Alpha
June 20, 2018/ YACE0092 Unit description 17
4.5 Materials
All parts being exposed to the heat transfer liquid are made of high quality material appropriate to the op-
erating temperature. Non-rusting stainless steel and high quality temperature-resistant materials are be-
ing used.
4.6 Temperature indication, control and safety circuit
The units are equipped with a 4-character LED display, which is used for the display of the measure-
ments and settings, as well as the operating status. The entry of setpoints and other settings occurs un-
der menu guidance via three keys.
With low level, overtemperature or other alarms the unit switches off the heater on all poles. The pump
and the refrigerating machine are also switched off. Unlocking the protection system (7.12.2).
A Pt100 temperature probe detects the outflow temperature in the bath. A high-resolution A/D converter
processes the measurement. Further measurement conditioning occurs using a special control algorithm
for controlling the heater actuator and the refrigeration system.
4.7 Refrigeration system
The refrigeration system consists essentially of a hermetically sealed compressor. Heat of condensation
and motor heat are dissipated by a fan-cooled finned condenser. Fresh air is drawn in at the front of the
unit; warmed air is discharged at the back and to the sides. The ventilation openings must not be restrict-
ed in order to ensure proper air circulation.
The compressors are fitted with a temperature monitor that responds both to the compressor tempera-
ture and to the motor current.
Cooling curves (10 Technical data).
4.8 Standard accessories
All refrigerated RA types are delivered with bath covers and an external circulation set to connect an ex-
ternal circuit.
All heating types A 6, A 12 and A 24 are not supplied with bath covers. Cooling coil and external circula-
tion set can be ordered as accessory (9).
A pump outflow reducer avoids to spill over liquid in small baths (A 6, RA 8, A 12, RA 12).

Alpha
18 Unpacking 20/06/2018/ YACE0092
5 Unpacking
After the unit and accessories have been unpacked they have to be examined for potential transport
damages. If there is any damage visible on the unit, a claim must be filled in writing with the freight for-
warder (expeditor); a notification to the freight forwarder (expeditor) is obligatory so that the shipment
can be examined. Please also inform the LAUDA Service Constant Temperature Equipment (8.5).
Standard accessories:
Catalogue No.
Quantity
Designation
YACE0092
1x
Operating instructions
for all thermostats
---
1x
Clamp
for immersion and for heat-
ing thermostats
---
2x
Pump outflow reducer with different
hole sizes (diameter Ø 4.5 or Ø 6.0)
for all thermostats
---
1x
Bath cover
RA (cooling) types only
---
1x
External circulation set
RA (cooling) types only
---
1x
Silicone tube
outlet to inlet (pump connection link)
RA (cooling) types only
EZB 260
Warning label “HOT surface”
for all thermostats

Alpha
June 20, 2018/ YACE0092 Preparations 19
6 Preparations
6.1 Assembly and Setting Up
Do not connect with power mains before assembly and setup is
complete!!
Place the unit on a flat surface. If necessary,
attach the appropriate pump outflow reducer R
onto the pump nozzle. In small baths use the
pressure reducer to prevent any splashing of heat
transfer liquid.
Immersion/Heating thermostats only:
Fix the clamp at the bottom of the control head by
two screws M4 x 6 A3 (1.4541) ISO 7046 (re-
cessed countersunk flat heads).
Accessory “cooling coil set”:
Fix the cooling coil set at the bottom of the control
head by means of the two screws (pan head with
cross recess). The cooling coil set belongs to the
left side of the head.
R

Alpha
20 PreparationsJune 20, 2018/ YACE0092
Hang the thermostat into the bath and fix the
clamp with the knurled screw on the edging
of the bath.
The wall thickness has to be 10 –30 mm.
Check for tight fitting!
Carefully attach the immersion
thermostat to prevent it dropping into
the bath.
If this should occur during operation,
never reach into the bath! Withdraw
the mains plug immediately!

Cooling thermostats only
NEVER overturn the unit and never put it upside
down!
After transport and before starting up, store it
standing in upright position for two hours if possi-
ble.
Do not cover the ventilation openings.
Keep clear distance of at least 40 cm.
Pump connection link (silicone rubber)
Remove the silicone L-tube at the pump housing to improve
the circulation in the bath.
L-tube (silicone rubber)
Operation with external consumer
(circulation thermostat (6.4))