Operating manual EN LWT-100 Conductivity measuring device Permanently connected graphite 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-100 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-H87.0.01.DB214-1.
LWT-100 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-100 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-100 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-100 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-100 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-100 5 The product at a glance 5.1 The LWT-100 LCD Display LWT-100 LWT-100 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-100 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-H87.0.01.DB214-1.
6 | Bases for measurement LWT-100 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. 6.
LWT-100 Bases for measurement | 6 place with calibration to known comparison solutions or with actual evaporation of a certain amount of liquid with measured conductivity and subsequent weight of the total dissolved solids. 6.4 Salt content / salinity measurement In SAL measuring mode, the salinity, which is the salt content of sea water, is determined. The basis for this is the International Oceanographic Tables, IOT. Standard salt water has a salinity of 35 ‰, 35 g of salt per 1 kg of sea water.
6 | Bases for measurement LWT-100 available for this purpose. In normal application conditions, semi-annual testing is recommended; Adjustment of the measuring input [} p. 20]. A system test by the manufacturer is recommended in case of doubt; Calibration and adjustment service. For this purpose, also refer to 2 Adjustment of the measuring input [} 20] 6.6 Temperature compensation The conductivity of aqueous solutions is temperature-dependent.
LWT-100 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-100 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-100 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-100 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-100 Operation | 8 Temperature compensation TCOR OFF Do not compensate conductivity measurement NLF Non-linear function for natural water in accordance with EN 27888 (ISO 7888) Ground water, surface water or drinking water 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 p
8 | Operation LWT-100 8.2.4 Adjustment of the measuring input Description The temperature input can be adjusted with the zero point correction and the gradient correction. If an adjustment is made, you change the pre-adjusted factory settings. This is signalled with the T.OF, T.SL or S(L display text when the product is switched on. The standard settings of the zero point value and the gradient value of the temperature input is 0.00.
LWT-100 Operation | 8 Zero point correction T.OF 0.00 No zero point correction -5.00 .. 5.00 Zero point correction in °C. and/or at °F -9.00 .. 9.00 Gradient correction of the temperature T.SL 0.00 No gradient correction -5.00 .. 5.00 Gradient correction in % 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.
8 | Operation LWT-100 NOTE The most precise results can be achieved when the control solution temperature is adjusted to 25 °C. With different temperatures, the table value of the corresponding temperature must be used as a setpoint. Outcome of an action The changed value is saved and the Configuration menu is closed. NOTE If the product is switched off without saving the configuration, the last save value is reproduced on the next start-up of the product. 22 / 26 B-H87.0.01.DB214-1.
LWT-100 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-100 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-H87.0.01.
LWT-100 Technical data | 11 11 Technical data Measuring range Conductivity 0 .. 2000 S/cm 0.00 .. 20.00 mS/cm Specific resistance Salinity TDS Temperature Accuracy Conductivity Temperature Measuring cycle Display Additional functions Compensation Housing Protection rating Dimensions L*W*H [mm] and weight Operating conditions Storage temperature Power supply Current requirement/ battery life Battery indicator Auto-power-OFF function Directives and standards 0.0 .. 100.0 mS/cm 0.0 .. 50.0 g/kg 0 ..
12 | Service LWT-100 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-H87.0.01.DB214-1.
