Memmert WNE 7 User manual

Waterbath
WNE 7 - 45
WPE 45
Oilbath
ONE 7 - 45
Operating instructiOns

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1 General notes and safety notes............................................................................................................ 4
1.1 Transport................................................................................................................................. 4
2 Technical data .....................................................................................................................................5
2.1 Material quality ....................................................................................................................... 6
2.2 Electrical equipment ................................................................................................................ 6
2.3 Note on EMC (electromagnetic compatibility)...........................................................................6
2.4 Brief technical description ........................................................................................................ 6
2.5 Standard equipment................................................................................................................ 7
3 Installation..........................................................................................................................................7
3.1 Initial start-up.......................................................................................................................... 8
3.2 Installation - waterbaths ..........................................................................................................8
3.3 Installation - oilbaths ...............................................................................................................9
4 Bath construction and operation .......................................................................................................10
4.1 Controls and indications ........................................................................................................10
4.2 Switching on ......................................................................................................................... 11
4.3 Setting the parameters .......................................................................................................... 11
4.3.1 Temperature setpoint.......................................................................................................... 12
4.3.2 Delayed switch-on ..............................................................................................................12
4.3.3 Hold time of the setpoint temperature................................................................................13
4.3.4 Setpoint-dependent waiting time........................................................................................ 13
4.3.5 Circulating pump (WPE 45 only) .........................................................................................14
4.3.6 Temperature monitor.......................................................................................................... 15
4.3.7 Level monitor...................................................................................................................... 15
4.3.8 Setup menu........................................................................................................................15
4.3.8.1 Calibration....................................................................................................................... 16
4.3.8.2 Selection of temperature monitor (waterbaths only).........................................................17
5 Programming example of a programme sequence .............................................................................17
6 Monitoring the programme sequence ...............................................................................................18
7 Temperature monitor and protection devices .....................................................................................19
7.1 Mechanical temperature monitor: temperature limiter............................................................19
7.2 Electronic temperature monitor .............................................................................................19
7.2.1 Adjustable temperature monitor (TWW) Protection Class 3.1 to DIN 12880......................... 20
7.2.2 Adjustable temperature limiter (TWB) Protection Class 2 to DIN 12880................................20
7.3 Monitor relay.........................................................................................................................20
8 Use of the cover (special equipment) .................................................................................................21
9 Level control (special equipment)....................................................................................................... 21
10 Cooling system (special equipment).................................................................................................22
11 Cleaning and maintenance..............................................................................................................22
12 Check list for fault rectification ........................................................................................................ 23
13 Action on supply failure .................................................................................................................. 23
14 Glossary..........................................................................................................................................23
15 CE Conformity of Declaration ..........................................................................................................24
16 Address and customer service.......................................................................................................... 25
17 Index .............................................................................................................................................. 26

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1 General notes and safety notes
You have purchased a technically fully proven product which has been produced in Germany with the use
of high-grade materials and the application of the latest manufacturing techniques; it has been factory
tested for many hours.
In addition we guarantee the supply of spare parts over 10 years.
Observation of the Operating Instructions is necessary for faultless
operation and for any possible claims under warranty. If these
Instructions are disregarded, all claims under warranty, guarantee and
indemnification are excluded.
This mark on the product means:
Note Operating Instructions
Warning – bath hot when operating
The right to technical modifications is reserved.
Dimensional details are not binding.
1.1 Transport
Always use gloves!
If the units W../O.. 22 to 45 have to be carried, at least 2 persons are required.
Place the bath accurately horizontal and not
on an inflammable support.

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2 Technical data
Model 7 1014222945
Volume [liter] 7 10 14 22 29 45
Usable bath length A [mm] 240 350 350 350 590 590
Usable bath width B [mm] 210 210 290 290 350 350
Usable bath depth C [mm] 140 140 140 220 140 220
Housing length D [mm] 468 578 578 578 818 818
Housing width E [mm] 356 356 436 436 516 516
Housing height (with flat cover) F [mm] 238 238 238 296 238 296
Housing height (with gable cover) G [mm] 337 337 347 405 343 401
Weight [kg] 11 14 16 17 24 26
Current consume [A] 5,2 5,2 7,8 8,7 10,4 12,2
Power [W] 1200 1200 1800 2000 2400 2800
Ambient conditions Ambient temperature 5°C - 40°C
rh max. 80% (no condensation)
Overvoltage Category: II
Contamination degree: 2
Setting temperature range 10ºC to 95ºC on waterbaths
with activation of the boiling mode to 100°C, see section
4.3.1
20ºC to 200ºC on oilbaths
Setting accuracy: 0,1°C
Indication accuracy 0,1°C
Working temperature range From 5ºC above ambient temperature on water-
and oilbaths or 15°C above ambient temperature
on waterbaths with circulating pump to nominal
temperature = maximum temperature (see rating plate)

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2.1 Material quality
Memmert is using stainless steel (Mat.Ref. 1.4301) for the external casing as well as for the interior, an
outstanding material because of its high stability, optimum hygienic features and corrosion resistance
against many (not all!) chemical combinations (Attention e.g. at chlorine combinations!).
The load has to be tested for its chemical compatibility with the materials mentioned above.
A material-compatibility table covering all these materials can be requested from MEMMERT.
WARNING! Always pull out the supply plug before
opening the bath cover!
2.2 Electrical equipment
• Operating voltage see rating label 50/60 Hz, WPE 45: 50Hz
• Protection Class 1, i.e. operating isolation with ground connection to EN 61 010
• Protection IP20 to DIN EN 60 529
• Interference suppression to EN55011 Class B
• Bath protected by a fuse 250V/15A fast blow
• Controller protected by a 80 mA fuse (200 mA on 115 V)
• When connecting a MEMMERT bath to the electrical supply you have to observe any local
regulations which apply (e.g. in Germany DIN VDE 0100 with FI protection circuit)
2.3 Note on EMC (electromagnetic compatibility)
This product is intended to operate on a supply network with a system impedance Zmax at the transfer point
(building connection) of 0.292 Ohm max. The user has to ensure that the product is only operated on an
electrical supply network which meets these requirements. If necessary, details of the system impedance
can be obtained from the local electricity supply authority.
Note:
Any work which involves opening up the bath must only be carried out
by a properly qualified electrician!
2.4 Brief technical description
MEMMERT-water and oilbaths are electrically heated and electronically controlled.
The temperature of the thermostating liquid is continuously controlled by a microprocessor-controller
with pulse package control. Electronic microprocessor-PID-controller with continuous power matching
and autodiagnostic system with fault indicator (see section 12), integral timer for digital programme time
selection.
The temperature is measured using a Pt100 temperature sensor (4-wire circuit). The accuracy is as
follows:
WNE ONE
Setting accuracy 0,1ºC 0,1ºC
Temperature fluctuation ±0,1ºC ±0,2ºC
The components of temperature control are controlled by integrated malfunction-recognition. The heaters
are installed outside - therefore no problems through dirt or limeresidue.

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2.5 Standard equipment
• Electronic fuzzy-supported PID process controller with delayed programme start and programmable
hold time. The controller has permanent power matchinig and an autodiagnostic system for rapid
fault finding
• Recessing push/turn control for simple operation of bath
• Visual alarm indication
• Mechanical temperature limiter (TB Class 1)
• Monitor relay to switch off heating in case of fault
• Boiling mode for temperatures above 95°C
• Setpoint-dependent waiting time
• Digital overtemperature monitor (on waterbaths choice between TWB Class 2 or TWW Class 3.1,
on oilbaths TWB Class 2)
• Additional digital display of monitoring temperature
• Two separate, stainless-steel Pt100 temperature sensors (Mat.Ref. 1.4571) Class A in 4-wire circuit
for control and monitoring
• Built-in sounder as alarm on overlimit, as audible signal at programme end, and to acknowledge
input (key click)
• Warning at low liquid level
• Convenient calibration directly on the controller at one freely selected temperature
• Manually switched circulating pump, also pump switch-off at programme end (WPE 45 only)
Special equipment (to be ordered separately as accessory): flat cover with concentric ring sets, gable cover
to drain condensate, cooling device, various racks for test tubes, bottles etc.
3 Installation
The unit must be placed on a horizontal, non-flammable surface which cannot tilt.
The vent openings in the left and back side must remain unobstructed. Minimum wall spacing on all sides
is 80 mm. The minimum spacing from the top of the bath to the next ceiling (rack, etc.) is 750 mm.
space for
air circula-
tion
space for
air circula-
tion
min.
750mm
min.
80mm
min.
80mm

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3.1 Initial start-up
When the bath is started up for the first time, it should be supervised continuously until steady conditions
have been reached.
3.2 Installation - waterbaths
Mains
connection
The mains connection cable must be placed away from any hot surface.
Filling
In order to garant the high quality of the stainless steel it is recommended by the
steel producer to fill the waterbath with deionised water.
Draining The tank can be drained through the drain valve. The thermostating fluid must be cooled
to room temperature before draining. Drain the fluid either directly into an appropriate
container or connect an appropriate hose to the drain valve.
Operation with non-flammable thermostating liquids only!
drain valve
IMPORTANT! The water level in the bath must be between the
two markings at the right side of the tub!
Waterbaths can be fitted with a
level control system (see section 9).
NOTE: Polluted fluids may not be drained directly into the public
wastewater system. If the thermostating fluid is polluted, please
make sure that it will be properly filtered or dumped according to the
applicable regulations.
max water level
min water level

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3.3 Installation - oilbaths
Mains
connection
The mains connection cable must be placed away from any hot surface.
Filling
IMPORTANT! The liquid level in the bath must be between the two
markings at the right side of the tub! The spacing between top edge
of oilbath and liquid level must be at least 30 mm as the oil expands
strongly on heating.
Draining The tank can be drained through the drain valve. The thermostating fluid must be cooled
to room temperature before draining. Drain the fluid either directly into an appropriate
container or connect an appropriate hose to the drain valve.
For safety reasons the flash point of the oil must be at 300ºC or higher.
The manufacturer of the oil may also have special regulations for oil-
changing intervals due to pollution oraging of the oil which have to be
observed.
In case of fire never extinguish with water.
Use a suitable damping-down medium (e.g. fire blanket)!
An overheated bath must never be refilled or topped up!!
Warning - bath hot when operating
drain valve
NOTE: Polluted fluids and oils may not be drained into the
public wastewater system. Please make sure, that the oil will be
properlydumped according to the applicable regulations.
max water level
min water level

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4 Bath construction and operation
The heating positioned on three sides around the tank ensures a natural water circulation of the liquid
inside, thus securing an optimal uniform temperature distribution.
4.1 Controls and indications
relatively largest heat loss (since
furthest away from the heated ribs)
minimum heat loss (since
very close to the heated ribs)
bath
Insulation
heating elements
time-symbol
delay-symbol
(delayed switch-on)
hold-symbol
(hold time)
alarm-symbol
SET key
monitor temperature
indication
temperature display
heater-symbol
level-symbol
pump-symbol
push/turn
control
7 5. 0
7
7. 0

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4.2 Switching on
The bath is switched on by pressing the push/turn control
and can be operated in connection with the
SET-key.
Bath switched off: The push/turn control is
pushed in and protected against damage.
4.3 Setting the parameters
A parameter can be selected by rotating the push/turn control; all other parameters are then dimmed.
The selected parameter flashes brightly and can now be altered with the push/turn control while holding
down the SET key (protection against unintentional alteration).
If the push/turn control is rotated quickly the setpoint is altered in large steps; with slow operation it is
altered in single steps.
After the SET key has been released the newly set value is stored.
Further rotation of the push/turn control selects the next parameter.
Rotation of the push/turn control selects the following parameters (in the order indicated), to be altered
as described above:
1. Temperature setpoint
2. Delayed switch-on
3. Hold time of the setpoint temperature
4. Setpoint-dependent waiting time
5. Circulating pump (WPE 45 only)
6. Temperature monitor

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4.3.1 Temperature setpoint
The bath starts to heat up immediately
to the set temperature.
Adjustment range:
waterbaths: 10°C to 95°C or ca. 100°C with
activation of the boiling mode
oilbaths: 10°C to 200°C
Setting and indication accuracy:
water-/oilbaths: 0.1°C
Rotate the push/turn control until the °C symbol flashes.
The setpoint temperature can then be selected with the SET key depressed, as
described in Section 4.3. After releasing the SET key the display briefly flashes the
setpoint. The display then changes to the actual temperature and the controller
starts to control to the selected setpoint temperature.
During heating the symbol flashes in proportion to the actual heater power.
Waterbaths only:
In order to reach water temperatures above 95°C (boiling point), waterbaths are
provided with the boiling mode. If this is selected, the heating is switched on
permanently.
Activating the boiling mode by rotating the push/turn control beyond the
maximum value until the display shows CCC
The setting “boiling mode“ is not stored permanently. After the bath is switched
off and on again, the controller shows again the previously selected setpoint..
°C
°C
4.3.2 Delayed switch-on
The bath starts to heat up to the previously
selected temperature only after the time of
the switch-on delay has elapsed.
Adjustment range:
1 min bis 999 hrs
Setting accuracy:
<100 hrs: 1min
≥100 hrs: 1hr
Indication accuracy:
<10 hrs: 1min
≥10 hrs: 1hr
Rotate the push/turn control until the (delay) and the symbol flashes.
The duration of the delayed switch-on can then be set with the SET key depressed
as described in Section 4.3. After the SET key has been released the bath briefly
flashes the setting of the switch-on delay.
The switch-on delay is then activated and the display alternates between the
actual temperature and the running time of the switch-on delay. The time is
shown with a negative sign and runs down. In this way it is possible to determine
at any time how much longer the bath waits until it begins to heat up.
If no delayed switch-on is required, it can be de-activated by the setting OFF.
°C
°C
°C
*
90°C
*
delay 12h
90°C

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4.3.3 Hold time of the setpoint temperature
The bath switches off the heating after
the end of the selected hold time. In this
case the hold time includes the heating-
up time..
Adjustment range:
1min bis 999 hrs
Setting accuracy:
<100 hrs: 1min
≥100 hrs: 1hr
Indication accuracy:
<10 hrs: 1min
≥10 hrs: 1hr
Rotate the push/turn control until the (hold) and the symbol flashes.
The duration of the hold time can then be selected with the SET key depressed,
as described in Section 4.3. After the SET key has been released the bath briefly
flashes the hold time setting.
If no hold time has been programmed, the hold time is activated immediately
and the display alternates between the actual temperature and the running time
of the hold time. As with switch-on delay, the residual time is shown with a
negative sign and runs down.
If no hold time is required, it can be de-activated by the setting OFF.
°C
°C
°C
4.3.4 Setpoint-dependent waiting time
The bath switches off the heating after the selected
hold time has elapsed. The hold time begins only
when the setpoint temperature has been reached.
Setting:
ON or OFF
Rotate the push/turn control until flashes.
With the SET key depressed, the setpoint-dependent waiting time can be activated
or de-activated.
°C
°C
*
t
90°C
hold 6h
*
t
hold 6h
90°C

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4.3.5 Circulating pump (WPE 45 only)
Operation of a circulating pump can improve the temperature distribution inside the waterbath. The pump
draws water from the centre of the bath and distributes it through the pipes in the front and back of the
bath. The continuous water circulation avoids larger temperature differences. At a water temperature of
e.g. 90°C the temperature difference in the entire bath is less than 0.36°C.
Note:
If the boiling mode CCC has been activated, circulating pump operation is not possible!
Setting:
ON or OFF
Rotate the push/turn control until the symbol flashes.
With the SET key depressed the circulating pump can then be switched on and
off.
°C
apertures to
circulating pump
pipe
circulating pump
waterbath WPE 45
(view from above)

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4.3.6 Temperature monitor
(see also sections 4.3.8.2 and 7)
Adjustment range:
up to 10°C above nominal temperature
Setting and indication accuracy:
<100°C: 0.1°C
≥100°C: 1°C
Rotate the push/turn control until the monitor temperature display flashes.
The monitor temperature can then be adjusted with the SET key depressed, as
described in section 4.3. While the SET key is depressed, the top display shows
for information the previously selected setpoint temperature.
It is important to ensure that the monitor temperature is always set sufficiently
high above the maximum working temperature.
°C
4.3.7 Level monitor
When the liquid level has fallen so far that the upper of the two Pt100 temperature
sensors is above the bath liquid, the different temperatures inside and outside the
bath liquid cause the symbol to flash, the sounder operates, and the heating
is switched off for safety reasons.
On topping up the liquid, ensure that the liquid level is between the two level
marks on the right inside the bath. (see also Sections 3.2 and 3.3)
The bath is again ready for operation after switching it off and on or after pressing
the SET key.
4.3.8 Setup menu
The setup menu provides additionally for a single-point calibration and the choice
of temperature monitor.
To get to the setup menu the SET key has to be depressed while the bath is
switched on.
After switching on, the display shows the version of the controller software. °C
°C
monitor temperature
setpoint temperature
*
t

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4.3.8.1 Calibration
Customer calibration of the bath on the controller using a self-selected calibration temperature. A positive
or negative calibration difference against it can be set.
General calibration instructions:
1. Set the required calibration temperature and set the calibration difference to 0.0°C
(see below “set calibration temperature“ and “set calibration difference“).
2. Measure the deviation from the selected calibration temperature under steady conditions, using a
reference instrument.
3. Set the calibration difference. If the measured reference temperature is lower than the indicated
value, the calibration difference has to be set with a negative sign.
4. Carry out a check measurement using the reference meter.
Example: Temperature difference between controller display (e.g. 70.0°C) and bath liquid (e.g. 69,0°C) has
to be corrected.
1. Set calibration temperature to 70.0°C and set calibration difference to 0.0°C.
2. Using a calibrated reference instrument, the measured temperature is 69.0°C at a setpoint
temperature of 70.0°C.
3. Set calibration difference to –1.0°C.
4. After the bath has settled down the reference instrument should read 70.0°C.
Adjustment range: calibration temperature:
waterbaths: 10°C to 95°C
oilbaths: 20°C to 200°C
Adjustment range: calibration difference:
water-/oilbaths: -5.0°C to 5.0°C
Set calibration temperature:
Rotate the push/turn control until flashes.
The calibration temperature can then be set with the SET key depressed as
described in section 4.3.
Set calibration difference:
Rotate the push/turn control until flashes.
The calibration difference can then be set with the SET key depressed as described
in section 4.3.
°C
°C
°C
°C
Note:
Setting the calibration difference to 0.0°C restores the factory calibration!
[
°C
]
0 10050
calibration
difference -1°C
calibration
temperature
70°C
factory temperature
measurement
corrected temperature
measurement

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4.3.8.2 Selection of temperature monitor (waterbaths only)
Setting:
2or 3.1
Rotate the push/turn control until flashes.
With the SET key depressed it is possibile to select the temperature monitor as
adjustable temperature limiter (TWB) Protection Class 2 to DIN 12880, or as
adjustable temperature monitor (TWW) Protection Class 3.1 (see also sections
4.3.6 and 7) °C
°C
5 Programming example of a programme sequence
monitor temperature
setpoint temperature
monitor temperature
setpoint temperature
Class 2 Class 3.1
1. Setpoint temperature setting
Rotate the push/turn control until the °C symbol flashes. With the SET key
depressed, use the push/turn control to set the temperature setpoint to f.ex.
90.0°C
°C
2. Delayed switch-on setting
Rotate the push/turn control until the (delay) and the symbol flashes. With
the SET key depressed, use the push/turn control to set the time f.ex. 6.00.
°C
3. Hold time setting
Rotate the push/turn control until the (hold) and the symbol flashes. With
the SET key depressed, use the push/turn control to set the time f.ex. 4.00.
°C
4. Setpoint-dependent waiting time setting
Rotate the push/turn control until flashes. With the SET key depressed, use
the push/turn control to set on.
°C
°C
5. Switch on the circulating pump (WPE 45 only)
Rotate the push/turn control until the symbol flashes. With the SET key
depressed, use the push/turn control to set on.
°C
6. Monitor temperature setting
Rotate the push/turn control until the monitor temperature display flashes. With
the SET key depressed, use the push/turn control to set the monitor temperature
to f.ex. 91.5°C.
°C
°C
*
t
*
t

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6 Monitoring the programme sequence
Bath does not heat up
During the delayed switch-on the symbol
flashes and the display alternates between
residual time and actual temperature
°C
°C
Bath heats up to setpoint
temperature
SP activated:
After the end of the delayed switch-on the
symbol goes dark and the bath heats up to
the selected setpoint temperature. The display
alternates between actual temperature and
SP until the setpoint temperature is reached.
Heating is indicated by the symbol.
°C
°C
Bath holds setpoint
temperature
SP is de-activated or after the setpoint
temperature has been reached:
During the hold time the symbol flashes
and the display alternates between the residual
time and the actual temperature.
°C
°C
Heating is switched off
After the hold time has elapsed the symbol
goes dark, the heating is switched off, and
the display alternates between the actual
temperature and END.
°C
°C
*
t
90°C
hold 4h
delay 6h
*
t
90°C
delay 6h
hold 4h
*
t
90°C
hold 4h
delay 6h
*
t
90°C
delay 6h
hold 4h

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7 Temperature monitor and protection devices
The monitor temperature is measured with a separate Pt100 temperature sensor inside the chamber. The
monitor unit provides protection for the bath load as well as protection for bath and its surroundings.
The bath is provided with duplicate overtemperature protection (mechanical / electronic) according to DIN
12880.
7.1 Mechanical temperature monitor: temperature limiter
All water- and oilbaths are fitted with a mechanical temperature limiter (TB) Protection Class 1 to DIN
12880.
If the electronic monitor system should fail during operation and the fixed factory-set maximum temperature
is exceeded by approx. 30°C the temperature limiter switches off the heating permanently as a final
protective measure. The symbol lights up continuously as fault indication.
In addition to its function as overtemperature protection the TB also operates as low-level protection, i.e.
the heating is switched off permanently if the liquid drops below a certain level.
Fault rectification after the TB cut-out has been activated:
1. Switch off the bath and allow it to cool down
2. Rectify the fault (e.g. top up the liquid, replace temperature probe) and where appropriate contact
customer service
3. The bath is again ready for operation only after it has cooled down and after the fault has been
rectified
7.2 Electronic temperature monitor
Note:
The monitor temperature must always be set sufficiently high above the maximum
working temperature.
The manually selected monitor temperature of the electronic overtemperature protection is monitored in
the case of waterbaths either by an adjustable temperature monitor (TWW) Protection Class 3.1 to DIN
12880 or by an adjustable temperature limiter (TWB) Protection Class 2 to DIN 12880, and in oilbaths by
an adjustable temperature limiter (TWB).
On waterbaths the temperature monitor can be selected in the setup menu (see section 4.3.8 or 4.3.8.2).
For details of temperature monitor and protection class see rating label.
Monitor temperature
Adjustment range: up to 10°C max
above nominal temperature (for
nominal temperature see rating
label)
°C
Using the push/turn control select the
monitor temperature.
With the SET key depressed, use the push/turn
control to set the monitor temperature.

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7.2.1 Adjustable temperature monitor (TWW) Protection Class 3.1 to DIN 12880
If the manually set monitor temperatur is exceeded, the TWW takes over the control of the temperature
and starts to control at the monitor temperature. The symbol flashes as warning.
7.2.2 Adjustable temperature limiter (TWB) Protection Class 2 to DIN 12880
If the manually set monitor temperature is exceeded, the TWB switches off the heating permanently and
can only be reset by pressing the SET key. The symbol flashes as warning.
7.3 Monitor relay
In addition the bath is equipped with an electronic monitor relay.
If a fault occurs during operation or if the selected setpoint temperature is exceeded by 10°C, then the
monitor relay continues control of the heating at this temperature in emergency operation.The symbol
flashes as warning.
Fault rectification after the monitor relay may been activated:
Check the controller for error messages (see section 12) and where appropriate contact customer service.
Example:
With a setpoint temperature of 80°C, if a fault occurs in the power unit (faulty triac) the bath continues to
operate in emergency operation at approx. 90°C.