Operating Instructions Waterbaths WNB 7 - 45
1 General notes and safety notes............................................................................................................ 3 1.1 Transport ................................................................................................................................. 3 2 Technical data ..................................................................................................................................... 4 2.1 Material quality .................................................
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.
2 Technical data Model Volume [liter] Usable bath length A [mm] Usable bath width B [mm] Usable bath depth C [mm] Housing length D [mm] Housing width E [mm] Housing height (with flat cover) F [mm] Housing height (with gable cover) G [mm] Weight [kg] Current consume [A] Power [W] Ambient conditions Setting temperature range Setting accuracy Indication accuracy Working temperature range BASIC 7 10 14 22 29 45 7 10 14 22 29 45 240 350 350 350 590 590 210 210 290 290 350 350 140 140 140 220 140 220 468 578
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.
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 • High-grade stainless-steel Pt100-temperature sensor (Mat.Ref. 1.
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 Start-up - waterbath Mains connection The mains connection cable must be placed away from any hot surface. Filling max water level min water level drain valve 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.
4 Bath construction and operation 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 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 time-symbol delay-symbol (delayed switch-on) temperature display 7 5.
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).
4.3.1 Temperature setpoint Adjustment range: 10°C to 95°C or ca. 100°C with activation of the boiling mode * 90°C Setting and indication accuracy: 0,1°C The bath starts to heat up immediately to the set temperature. 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.
4.3.3 Hold time of the setpoint temperature Adjustment range: 1 min bis 99.59 hrs * 90°C hold 6h Setting accuracy: 1 min t Indication accuracy: <10 hrs: 1 min ≥10 hrs: 1 hr The bath switches off the heating after the end of the selected hold time. In this case the hold time includes the heatingup time. 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.
6 Monitoring the programme sequence symbol During the delayed switch-on the flashes and the display alternates between residual time and actual temperature * 90°C delay 6h hold 4h t °C Bath does not heat up * 90°C delay 6h hold 4h °C After the end of the delayed switch-on the symbol goes dark and the bath heats up to the selected setpoint temperature. Heating is indicated by the symbol.
7 Temperature monitor and protection devices 7.1 Mechanical temperature monitor: temperature limiter All waterbaths are fitted with a mechanical temperature limiter (TB) Protection Class 1 to DIN 12880. If the electronic control unit 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 warning. 7.
8 Use of the cover (special equipment) Gable cover The gable cover (may be ordered as already mounted special equipment) should always be closed in order to prevent evaporation of thermostating liquid and to obtain optimal temperature distribution. The gable shape of the cover makes sure that condensed water will not drop down into the loads. Flat cover For positioning of test flasks on top of the bath, a flat cover (special equipment) may be used.
10 Cooling system (special equipment) If the waterbath is fitted with a cooling device for quicker cooling of the bath liquid, the “water supply“ has to be connected by a hose f.ex. to a cold water supply line. The “discharge“ has to be lead into a drain. water supply (Use temperature resistant material for the tubing) discharge Please note, that the outflowing water may be hot! The discharge must be connected with tubing to an appropriate container or sink.
12 Check list for fault rectification Main switch ON, no indication on the display symbol not alight symbol alight symbol flashes CONF E-1 E-2 E-3 E-L Main fuse 15A or instrument fuse T80mA 250V~ on circuit board 55167.
15 CE Conformity of Declaration EC Declaration of Conformity Manufacturer´s name and address: MEMMERT GmbH + Co. KG Äußere Rittersbacher Straße 38 D-91126 Schwabach Waterbath WNB...
Standard units are safety-approved and bear the test marks: This product is subject to the Directive 2002/96/EC by the European Parliament and the EU Council of Ministers which concerns Waste Electrical and Electronic Equipment (WEEE). This product has been put on the market after 13 August 2005 in countries which have already incorporated this Directive into National Law. It should not be disposed off as part of domestic refuse. For disposal please contact your dealer or the manufacturer.
17 Index A H T address 18 alarm symbol 13 ambient conditions 4 ambient temperature 16 autodiagnostic system 5, 16 heating 8 hinge bolts 15 hold time of the setpoint temperature 11 B indications 8 initial start-up 7 installation 6 TB 13 technical data 4 temperature fluctuation 5 temperature limiter (TB) 13 temperature measurement 5 temperature monitor 13 thermofluid 7 transport 3 L U level control system 7, 14 liquid level 7 low-level protection 13 uniform temperature distribution 8 bath construc
Memmert GmbH + Co. KG | Po. Box 1720 | D-91107 Schwabach | Tel. +49 (0) 9122 / 925 - 0 | Fax +49 (0) 9122 / 145 85 | E-Mail: sales@memmert.com | www.memmert.com 08.06.
