Memmert WNB 7 Bedienungsanleitung

Waterbath

WNB 7 - 45

OPERATING INSTRUCTIONS

BASIC

page 2

BASIC

page 3

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.

For this waterbath we guarantee spare parts to be available up to 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 indemniﬁ cation are excluded!

This mark on the product means:

Note Operating Instructions

Warning – bath hot when operating

The right to technical modiﬁ cations is reserved.

Dimensional details are not binding.

1.1

Transport

Always use gloves!

If the units WNB 22 to 45 have to be carried, 2 persons are required.

Place the bath accurately horizontal and

not on an inﬂ ammable support!

BASIC

page 4

Technical data

Model

Volume [liter]

Usable bath length A [mm]

240

350

590

Usable bath width B [mm]

210

290

350

Usable bath depth C [mm]

140

220

140

220

Housing length D [mm]

468

578

818

Housing width E [mm]

356

436

516

Housing height (with ﬂ at cover) F [mm]

238

296

238

296

Housing height (with gable cover) G [mm]

337

347

405

343

401

Weight [kg]

Current consume [A]

5,2

7,8

8,7

10,4

12,2

Power [W]

1200

1800

2000

2400

2800

Ambient conditions

Ambient temperature 5ºC - 40°C

rh max. 80% (no condensation)

Overvoltage Category: II

Contamination degree: 2

Setting temperature range

10°C to 95°C

with activation of the

boiling mode up to 100°C, see

section 4.3.1

Setting accuracy

0,1°C

Indication accuracy

0,1°C

Working temperature range

5ºC above ambient temperature to

nominal temperature

= maximum temperature (see rating plate)

BASIC

page 5

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

•

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 Z

max

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 qualiﬁ ed electrician!

2.4

Brief technical description

MEMMERT-waterbaths 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

Pt 100 temperature sensor (4-wire circuit). The accuracy is as

follows:

WNB

Setting accuracy

0,1ºC

Temperature ﬂ uctuation

±0,1ºC

The components of temperature control are controlled by integrated malfunction-recognition. The

heaters are installed outside - therefore no problems through dirt or limeresidue.

BASIC

page 6

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 ﬁ nding

•

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

•

High-grade stainless-steel Pt100-temperature sensor (Mat.Ref. 1.4571) Class A in 4-wire circuit

•

Boiling mode for temperatures above 95°C

Special equipment (to be ordered separately as accessory): ﬂ at cover with concentric ring sets, gable

cover to drain condensate, cooling device, various racks for test tubes, bottles etc

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.

3.1

Initial start-up

When the bath is started up for the ﬁ rst time, it should be supervised continuously until steady conditions

have been reached.

3.2

Start-up - waterbath

Mains

connection The mains connection cable must be placed away from any hot surface.

space for

air circula-

tion

space for

air circula-

tion

min.

750mm

min.

80mm

min.

80mm

BASIC

page 7

Operation with non-ﬂ ammable thermostating liquids only!

drain valve

max water level

min water level

Note

•

The tray may suffer damage as a result of corrosion and pitting, causing the temperature control

ﬂ uid to inﬁ ltrate the heating system. Only ever use demineralised water with a conductance level of

5-10 microsiemens and a pH value between 5 and 7.

•

The tray may suffer damage if ultrapure water or DI water with an electrical conductance level

of below 5 microsiemens is used. Only ever use pretreated water with a conductance level of 5-10

microsiemens.

•

When ﬁ lling the bath, make sure you stop when the

liquid level is between the two ﬁ ll level

marks on the right inside wall of the tray. Water baths may have a

water level control feature (see

section 9).

BASIC

page 8

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 fur-

thest 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

temperature display

heater-symbol

push/turn control

7 5. 0

BASIC

page 9

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 ﬂ ashes 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:

Temperature setpoint

Delayed switch-on

Hold time of the setpoint temperature

BASIC

page 10

4.3.1 Temperature setpoint

The bath starts to heat up

immediately to the set temperature.

Adjustment range:

°C to

°C or ca.

100

°C with

activation of the boiling mode

Setting and indication accuracy:

0,1

°C

Rotate the push/turn control until the

°C

symbol ﬂ ashes.

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 brieﬂ y

ﬂ ashes 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 ﬂ ashes in proportion to the actual heater power.

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

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:

min bis

99.59

hrs

Setting accuracy:

min

Indication accuracy:

<10 hrs:

min

≥10 hrs:

Rotate the push/turn control until the

(delay) and the

symbol ﬂ ashes.

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 brieﬂ y ﬂ ashes the setting of the switch-on delay.

The delayed switch-on 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

90°C

delay 12h

90°C

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