Operating manual EN LWT-110 Conductivity measuring device Permanently connected stainless steel 2-pole measuring cell Waterproof Precise and fast
Table of contents Table of contents 1 Legal address of the manufacturer................................................................................................... 4 2 2.1 2.2 2.3 2.4 2.5 About this documentation ................................................................................................................. 5 Foreword...............................................................................................................................................
Table of contents 9 Error and system messages............................................................................................................ 23 10 Disposal............................................................................................................................................. 24 11 Technical data................................................................................................................................... 25 12 12.1 Service ....................
1 | Legal address of the manufacturer LWT-110 1 Legal address of the manufacturer Conrad Electronic SE Klaus-Conrad-Str. 1 D-92240 Hirschau http://www.conrad.com WEEE reg. no. DE 28001718 4 / 26 B-H87.0.02.DB214-1.
LWT-110 About this documentation | 2 2 About this documentation 2.1 Foreword Read this document carefully and familiarise yourself with the operation of the product before you use it. Keep this document ready to hand and in the immediate vicinity of the product so that it is available to the personnel/user for reference at all times in case of doubt. The product was developed according to the state of the art and fulfils the requirements of the applicable European and national Directives.
2 | About this documentation LWT-110 Outcome of an action Result, consequence or effect of an instruction. Emphases In order to simplify legibility and provide a clearer overview, various sections / information are emphasised. – 1234 Display elements – Mechanical controls – Product functions – Product labels – Cross-reference [} p. 5] – Foot notes 2.5 Further information Software version of the product: – V1.
LWT-110 Safety | 3 3 Safety 3.1 Explanation of safety symbols DANGER This symbol warns of imminent danger which can result in death, severe bodily injury, or severe property damage in case of non-observance. CAUTION This symbol warns of potential dangers or harmful situations which can cause damage to the device or to the environment in case of non-observance.
3 | Safety LWT-110 CAUTION Erratic behaviour! On suspicion that the product can no longer be operated without danger, it must be decommissioned and prevented from recommissioning with appropriate labelling. The safety of the user can be impaired by the device if, for example, if it shows visible damage, it no longer works as specified or if it was stored for an extended period of time under unsuitable conditions.
LWT-110 Description | 4 4 Description 4.1 Scope of delivery Please check to ensure the completeness of the product after opening the package. You should find the following components: – Quick reference guide – Handheld measuring device, ready for operation, including batteries – Permanently connected conductivity measuring cell 4.2 Job description The product offers precision, speed and reliability in a compact, ergonomic housing.
5 | The product at a glance LWT-110 5 The product at a glance 5.1 The LWT-110 LCD Display LWT-110 LWT-110 5.2 Display elements Display Battery indicator Evaluation of the battery status Unit display Display of units, if applicable, with unstable symbol or type of mode, min/max/hold Main display Measurement of the current conductivity value or value for min/max/hold Auxiliary display Corresponding temperature value for the value shown in the main display.
LWT-110 The product at a glance | 5 Function key Press briefly Long press, 2s Freeze measurement Return to measurement display Call up next parameter Open menu, frozen measurement is displayed Close menu, changes are saved B-H87.0.02.DB214-1.
6 | Bases for measurement LWT-110 6 Bases for measurement 6.1 Conductivity principles Conductivity γ Conductivity describes the capability of a material to conduct electrical current. It is also the inverse of specific resistance. The conductance is the inverse of the measured resistance R. Formula γ = l / (R*A) l = length of the material A = cross section R = measured resistance Unit [γ] = Siemens / metre = S / m Normally, the values for liquids are specified in µS / cm or in mS / cm.
LWT-110 2-pole measuring cell Bases for measurement | 6 4-pole measuring cell 6.4.2 Calibration / adjustment of the measuring cell In harsh applications and due to ageing processes, the cell constant of measuring cells changes. Depending on the application and precision requirement, the overall precision of the display device and measuring cell measuring chain should be checked regularly. Special testing and calibration solutions, such as GKL 101 are available for this purpose.
6 | Bases for measurement LWT-110 LFT1 = conductivity at Temperature 2 14 / 26 B-H87.0.02.DB214-1.
LWT-110 Maintenance | 7 7 Maintenance 7.1 Operating and maintenance notices NOTE The product and conductivity measuring cell must be handled with care and used in accordance with the technical data. Do not throw or strike. NOTE If the product is stored at a temperature above 50 °C, or is not used for an extended period of time, the batteries must be removed. Leaks from the batteries are avoided as a result.
7 | Maintenance LWT-110 NOTE Unnecessary screwing places the water-tightness of the product, among other things, at risk and should be avoided. NOTE Read the following handling instructions before replacing batteries and follow them step by step. If disregarded, the product could be damaged or the protection from moisture could be diminished. Description Prerequisites Instruction Proceed as follows to replace the batteries. – The product is switched off. 1.
LWT-110 Operation | 8 8 Operation 8.1 Commissioning 8.1.1 Explanation The product is switched on with the On/Off button. It may be necessary to configure the product after switching on. See Configuration [} p. 17]. Description Prerequisite – Sufficiently full batteries are inserted in the product. Instruction – Press On/Off button. Outcome of an action Information about the configuration of the product appears in the display. POFF T.OF T.SL S(L Automatic shutoff Automatic shut-off activated.
8 | Operation LWT-110 3. By briefly pressing the Function key, you can scroll through the parameters. Select the parameter you would like to configure. 4. When you have selected the desired parameter, change the parameter to the desired value with the Up button and the Down button. 5. The changes are saved after running through the entire Configuration menu. STOR appears in the display.
LWT-110 Operation | 8 Reference temperature for temperature compensation TREF 25 °( Reference temperature 25 °C or 77 °F 20 °( Reference temperature 20 °C or 68 °F OFF No automatic shut-off 15 30 60 120 240 Automatic shut-off after a selected time in minutes, during which no buttons have been pressed OFF Backlighting deactivated 15 30 60 120 240 Automatic shut-off of the backlighting after a selected time in seconds, during which no buttons have been pressed No automatic shut-off of the backlig
8 | Operation LWT-110 Prerequisites – Sufficiently full batteries are inserted in the product. – The product is switched off. – Ice water, regulated precision water baths or a water bath with a reference measurement are available as a reference. 1. Press and hold the Down button. Instruction 2. Press the On/Off button to switch on the product and open the Configuration menu. Release the Down button. The display shows the first parameter. 3.
LWT-110 Operation | 8 Gradient correction for the conductivity value T.SL Formula 1.000 No gradient correction 0.800 .. 1.200 Multiplier for the gradient correction Zero point correction: Displayed value = measured value – T.OF Gradient correction °C: Display = (measured value – T.OF) * (1 + T.SL / 100) Gradient correction °F: Display = (measured value – 32 °F – T.OF) * (1 + T.SL / 100) + 32 °F Gradient correction γ: Display = measured value / T.
8 | Operation 22 / 26 LWT-110 B-H87.0.02.DB214-1.
LWT-110 Error and system messages | 9 9 Error and system messages Display ---- Meaning Range switching or measured value unstable Possible causes Measuring cell defect Remedy Wait for the transient effect of the controller Contamination or air Measurement far bubbles outside of the measuring range Battery depleted Battery depleted Measurement leaves the permissible range Measuring range ex- Measurement too ceeded high The measurement is above the permissible range Send in for repair No display, R
10 | Disposal LWT-110 10 Disposal NOTE The device must not be disposed of with household waste. If the product is disposed of, please take it to a municipal collection point, where it will be transported to a disposal company in accordance with requirements of hazardous goods laws. Otherwise, return it to us, freight prepaid. We will then arrange for the proper and environmentally-friendly disposal. Please dispose of empty batteries at the collection points intended for this purpose. 24 / 26 B-H87.0.02.
LWT-110 Technical data | 11 11 Technical data Measuring range Conductivity 0.000 .. 2.000 µS/cm 0.00 .. 20.00 µS/cm Specific resistance 0.0 .. 100.0 S/cm 10.0 .. 200.0 kΩ/cm 0.010 .. 2.
12 | Service LWT-110 12 Service 12.1 Manufacturer If you have any questions, please do not hesitate to contact us: Contact VOLTCRAFT Distributed by Conrad Electronic SE Klaus-Conrad-Str. 1 92240 Hirschau, Germany Tel.: +49 9604 40 87 87 Fax: +49 180 5 312110 kundenservice@conrad.de WEEE reg. no. DE 28001718 26 / 26 B-H87.0.02.DB214-1.
