GANN 30001430 Operating Instructions Manual Download Page 33

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Measurement of the Relative Air Humidity /
Water Activity in Building Materials

This method is usually used for depth measurements in old buildings (sandstone, rough stone, wet

walls with efflorescence, etc.) where measurements based on the resistance measurement method

give no reproducible results. For this purpose the active electrode RF-T 31 with special tube

lengths of 250 and 500 mm is used. In the case of measurements over a longer period at several

points or at various depths, the drilled holes should be secured and closed by means of a masonry

sleeve / bore hole adapter.

The method of measuring the relative air humidity / equilibration moisture in screeds is chiefly used

in Great Britain and the Scandinavian countries. The active electrode RF-T 36 has been specially

developed for this. Compared with non-destructive measurement or resistance measurement it is

however very time-consuming and required relatively large holes. Reliability for the floor layer/

finisher is but on the other hand very good, if it is possible to wait for moisture balance (relative air

humidity of the surroundings equal to that of the hole). This method also increases reliability in

cases where there is not adequate information concerning the composition of the screed.

Use of the active electrode RF-T 31

For deep measurements in building materials by means of the relative air humidity, in addition to

the probe with a sensing tube length of 250 or 500 mm a bore hole adapter consisting of a masonry

sleeve of 150, 250 or 500 mm length should be used.

Summary of Contents for 30001430

Page 1: ...GANN HYDROMETTE UNI 1 UNI 2 Operating instructions ...

Page 2: ...1 ...

Page 3: ...edure is not permitted unless approved in writing by GANN Mess u Regeltechnik GmbH This manual has been most carefully composed The manufacturer and or supplier assumes no liability however for possible misprints or errors Copyright by GANN Mess u Regeltechnik GmbH Stuttgart Federal Republic of Germany ...

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Page 5: ...od in the range between 40 and 200 m c MB 35 for non destructive moisture measurements of concrete surfaces B 50 for non destructive moisture measurements of set inorganic construction materials concrete cement floor ing etc RF T 28 for air humidity measurements RF T 31 for air humidity measurements RF T 32 for air humidity measurements IR 40 for surface temperature measurements with infrared sens...

Page 6: ... compartment can be lifted by means of a coin inserted into the slot It is recommendable to replace or recharge the battery once the reading of the battery check is below 8 digits Power Source The meter is fitted as standard with a 9 V dry battery IEC 6 F 22 or IEC 6 LF 22 It is recommended to use alkali mangan batteries A rechargeable nickel cadmium battery can be fitted optional accessory It can...

Page 7: ...surface measurement of concrete Air Humidity position M 7 98 R H with live electrodes RF T 28 RF T 31 RF T 32 and RF T 36 Temperature 1 position 200 200 200 C with temperature probes PT 100 Temperature 2 position 600 200 600 C with temperature probes PT 100 Temperature 3 position M 20 0 200 Cwith infrared sensor IR 40 If the measured value exceeds the measuring capacity the figure 1 appears on the...

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Page 9: ...or Switch position B for measurement of set building materials according to the resistance measuring method position M for measurements using the following active electrodes MH 34 for moisture measurements on coniferous wood in the range between 40 and 200 m c MB 35 for non destructive moisture measurements of concrete surfaces B 50 B 60 for non destructive moisture measurements of set inorganic c...

Page 10: ...sing pro bes PT 100 position Batt for battery check 5 Measuring Key ON OFF Battery Check Set selector switch 4 to position Batt and press measuring key 5 The reading displayed should be higher than 7 5 digits If it is 7 5 digits or lower the battery is exhausted and should be replaced or recharged if a rechargeable battery is being used The cover of the battery compartment can be lifted by means o...

Page 11: ... adjustment unnecessary Measuring ranges Structural Moisture position B 0 80 digits with graphs for converting read ings into percent of moisture for various building materials Structural Moisture position M 0 199 digits non destructive measurement with active electrode B 50 B60 0 3 8 5 of dry weight with live electrode B 50 and conversion table 1 8 of dry weight with live electrode MB 35 on non d...

Page 12: ... and UNI 2 Admissible ambient temperatures Storage 5 to 40 C temporarily 10 to 60 C Operation 0 to 50 C short term 10 to 60 C not c ondensing The meter including accessory must not be stored or used in aggressive air or air contaminated by solvents General Remark The instructions for use of the meter and of the electrodes should be carefully observed to avoid measuring errors which may occur when ...

Page 13: ...ve electrode MH 34 Ref No 3350 with integrated measuring circuit for measurement of high moisture contents in coniferous wood specially in case of water borne storage and pre sorting of freshly cut timber for kiln drying Measuring range 40 to 200 m c ...

Page 14: ...oisture distribution in walls ceilings and floors It works according to a special measuring procedure and generates a concentrated high frequency field with substantial penetration depth Measuring range 0 to 199 digits classification by table 0 3 to 8 5 of dry weight conversion into of moisture by table 0 3 to 6 5 CM conversion by table according to material tested ...

Page 15: ...rs It works according to a special measuring procedure and generates a concentrated high frequency field with substantial penetration depth With built in limit value selector and acoustic signal generator Setting range 20 to 140 digits Measuring ranges 0 to 199 digits by table 0 3 to 8 5 of dry weight conversion by table according to material tested 0 3 to 6 5 CM conversion by table according to m...

Page 16: ...ircuit designed for surface measure ment of concrete in particular prior to coating or gluing Measuring range 1 to 8 m c of dry weight according to oven test direct display no conversion table required Test Standard Ref No 6073 for checking the active electrode MB 35 ...

Page 17: ...lete with connection cable Measuring range 7 to 98 R H and 10 to 80 C Response time about 20 seconds for 90 of the humidity difference at an ambient temperature of 20 C or about 120 seconds for 90 of temperature variation Filter Cap Ref No 3156 of sintered bronze for use with electrode RF T 28 in dust laden air or at high air speed ...

Page 18: ...0 to 80 C Sensor tube dia 10 mm Sintered filter tip 32 mm long Insertion length 250 mm Ref No 3131 Insertion length 500 mm Ref No 3132 Bore hole adapter with closing plug for use with plug in sensor RF T 31 for equilibrium moisture measurement in brick work or building materials For bore holes up to 150 mm in depth Ref No 5615 For bore holes up to 250 mm in depth Ref No 5625 For bore holes up to 5...

Page 19: ...00 mm Ref No 3134 Sensor Check Test and calibrating box for Probe RF T 28 Ref No 5728 Probe RF T 31 Ref No 5731 Probe RF T 32 Ref No 5732 Test and Calibrating Fluid for checking and recalibrating all electrodes type RF T Package of 5 ampoules of test fluid for sensor check including absorbing fleece sufficient for 5 tests or recalibrations SCF 30 for the range of 10 to 50 R H Ref No 5753 SCF 70 fo...

Page 20: ... of air humidity and air temperature water activity value or equilibrium moisture in rooms warehouses or solid substances e g concrete subflooring masonry etc Measuring Range 5 to 98 R H 5 to 60 C Dimensions 82 x 80 x 55 mm Sensor tube length 55 mm dia 12 mm ...

Page 21: ...33 mm coiled cable 320 1200 mm An ideal sensor for detection of heat bridges determination of the dew point temperature measurement of live moving or vi brating components as well as measurement of components with low heat capacity e g wood glass insulating materials for location of the position of the heating tubes of a floor heat ing etc Matt black stickers IR 30 E 95 Ref No 5833 Measurement spo...

Page 22: ...tube measuring range 20 to 200 C Temperature Probe TT 30 Ref No 3185 Robust immersion and combustion gas temperature probe with short sensor tube measuring range 50 to 350 C Temperature Probe ET 50 Ref No 3160 Quick responding air gas temperature probe for soft solid sub stances bulk materials and fluids measuring range 50 to 250 C Temperature Probe OTW 90 Ref No 3175 Angled special surface temper...

Page 23: ...ionally recommended with OT 100 Flexible Temperature Probes with Teflon insulated connection cable for solid and bulk materials as well as liquids up to 120 C FT 2 with Teflon cable 2 m long Ref No 3195 FT 5 with Teflon cable 5 m long Ref No 3196 FT 10 with Teflon cable 10 m long Ref No 3197 FT 20 with Teflon cable 20 m long Ref No 3198 ...

Page 24: ...below 40 m c the electrodes M 18 and M 20 should be used The active electrode MH 34 is equipped and also adjusted to pins 23 mm in length and the readings obtained represent the average moisture content of those section of the board or piece of wood penetrated by the pins We do not recommend using longer or shorter pins as this will affect the accuracy of reading Press or drive cautiously both pin...

Page 25: ...according to oven test The reading is displayed direct in per cent of moisture The electrode is fitted as standard equipment with the surface measuring caps M 20 OF 15 with elastic contact pads of conductive plastic material The pads are glued on their support which in turn are screwed on the electrode handle Make sure that the measuring caps are properly screwed down Exchange the elastic measurin...

Page 26: ... content of the material being measured The measuring range extends from 0 to 199 digits i e the displayed values are relative values They indicate the distinction between dry and moist building material The higher the measured value the higher the moisture content of the material being measured Drawing conclusions about the actual moisture content in per cent from the relative measured is only pe...

Page 27: ...conjunction with the also incorporated acoustic signal generator judgement of the tested building material without direct sight on the LCD readout Whenever the readings exceed the preset limit value a whistle signal sounds In the range between 30 and 70 digits the signal tolerance is 2 digits and in the range between 80 and 140 digits 3 digits ...

Page 28: ... with the surface to be tested The electrode ball must be in firm contact with the material As far as possible the electrode should be held perpendicularly to the surface being measured In corners measurement is only possible up to a distance of approx 4 5 cm from the edge The list below is intended to serve as a guide to the displayed values to be expected in practice and their classification Woo...

Page 29: ...c wt of the building material kg m Corresponding Relative Air Humidity 30 50 70 80 90 95 100 Display in Digits very dry normal dry semi dry moist very moist wet up to 600 10 20 20 40 40 60 60 90 90 110 more than 100 600 1200 20 30 30 50 50 70 70 100 100 120 more than 120 1200 1800 20 40 40 60 60 80 80 100 110 130 more than 130 above 1800 30 50 50 70 70 90 90 120 120 140 more than 140 ...

Page 30: ...5 0 5 5 5 9 Anhydrite screed weight 0 1 0 3 0 6 1 0 1 4 1 8 2 2 2 5 2 9 3 3 Concrete B 15 B 25 B 35 weight 1 3 1 9 2 5 3 2 3 8 4 4 5 0 5 6 6 2 Cement mortar weight 1 8 2 7 3 5 4 6 6 0 7 0 7 8 Lime mortar weight 0 6 2 0 3 3 4 5 Lime cement plaster mixture weight 2 2 3 6 5 0 6 4 7 8 9 2 10 6 11 0 Gypsum plaster weight 0 3 0 5 1 0 2 0 3 5 6 5 10 0 ...

Page 31: ...nd anhydrite binders at 40 C Note The references and tables concerning permissible or customary moisture proportions in practice contained in the Operating Instructions and the general definitions have been taken from the specialist literature No guarantee of correctness can therefore be given The conclusions each user may draw for his own purposes from the measurement results are based on the ind...

Page 32: ... the LCD readout 2 UNI 1 or 3 UNI 2 Technical specifications Measuring range 5 to 98 R H for short periods For continuous or long period measurements in the range above 80 R H a special calibra tion is required for the measuring sensors Admissible operating temperature 10 C to 60 C f or short periods for the meter and the electrodes 0 C to 50 C for long periods Admissible ambient conditions for th...

Page 33: ...hiefly used in Great Britain and the Scandinavian countries The active electrode RF T 36 has been specially developed for this Compared with non destructive measurement or resistance measurement it is however very time consuming and required relatively large holes Reliability for the floor layer finisher is but on the other hand very good if it is possible to wait for moisture balance relative air...

Page 34: ...is achieved when temperature equalization exists the same temperature in the hole adapter and sensor tube after approximately 30 minutes Then the measurement value can be read off and assessed by means of the following graph Use of the active electrode RF T 36 For the measurement a blind hole of 12 14 mm diameter and minimum 25 mm and maximum 50 mm deep must be drilled The depth of drilling depend...

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Page 36: ...humidity should be avoided over a long period as far as possible In order to make exceeding the measuring range particularly easy to recognize above 98 relative humidity a 1 appears on the left hand side of the display instead of the measured value Other measured value distortions can occur as a result of screening with parts of the body e g the hand or blowing or speaking breathing in the directi...

Page 37: ...hnical Specifications Measuring range 5 to 98 R H for short periods For continuous or long period measurements in the range above 80 R H a special calibra tion is required for the measuring sensors Admissible operating temperature 10 C to 60 C f or short periods for the meter and the electrodes 0 C to 50 C for long periods Admissible ambient conditions for the storage of the meter 10 C to 60 C for...

Page 38: ... absolute standstill of the value displayed can be achieved unless the sensor is installed in an airtight box The response time of the sensor in gently moving air is as follows for ambient temperatures from 20 C to 25 C for 90 of the humidity difference approx 20 seconds for 95 of the humidity difference approx 30 seconds The adjustment time in still air or at very low air movement can be reduced ...

Page 39: ... and that of the surrounding atmosphere the instrument with its electrode should be exposed to the ambient climate for approximately 10 to 15 minutes or until temperature equalization Here too the sensor adapts itself to the surrounding atmosphere without being switched on If it becomes dirty the sintered filter cap can be washed in residue free cleaning liquid and or blown from inside outwards wi...

Page 40: ...surrounding atmosphere the instrument with its electrode should be exposed to the surrounding atmosphere for approximately 10 to 15 minutes or until temperature equalization The sensor adapts itself to the surrounding atmosphere even if it is switched off Note If it becomes dirty the filter cloth inserted cannot be washed in cleaning liquids and or blown clear with compressed air from inside to ou...

Page 41: ...urrounding atmosphere measurement immediately after assembly the electrode should be exposed to the surrounding atmosphere for approximately 10 to 15 minutes or until temperature equalization The sensor adapts itself to the surrounding atmosphere even while being switched off Response time of the air humidity sensor RF T 36 The response time is delayed by the filter cap In exceptional cases it can...

Page 42: ...r cloth can only be washed in distilled water and or blown clear with slight excess pressure from inside outwards Therefore its use in very dusty media should be avoided Preferably the cleaning should be carried out from outside using a soft brush ...

Page 43: ... 26 2 27 2 26 7 1 11 3 14 9 17 6 19 8 22 3 24 2 24 4 24 5 4 9 5 13 0 15 8 18 2 20 3 22 2 21 8 22 3 6 7 7 11 1 13 9 16 3 18 4 20 3 19 4 20 1 9 6 0 9 3 12 0 14 3 16 5 18 3 17 3 18 0 2 4 2 7 4 10 1 12 4 14 5 16 3 15 4 16 1 5 2 4 5 6 8 2 10 5 12 5 14 3 13 6 14 3 3 0 6 3 8 6 4 8 6 10 6 12 4 12 1 12 5 0 1 2 1 9 4 3 6 6 8 5 10 3 10 7 10 6 7 2 9 0 1 2 6 4 8 6 7 8 4 9 4 8 8 5 4 8 1 6 0 7 2 9 4 8 6 4 8 3 6 ...

Page 44: ...d is not to be used for general test or calibrating purposes For testing or calibration of the standard moisture range the liquid SCF 70 is to be employed During testing or calibration the electrode the sensorcheck and the liquid must be of the same temperature This temperature must be maintained throughout the procedure Changes of temperature may be caused by a draft by breathing or blowing or by...

Page 45: ...fit Electrode RF T 31 Plug the top of the sensorcheck over the moisture sensor of the elec trode and screw to the thread of the electrode tubing Use no force and do not tighten it securely Electrode RF T 32 Insert the oval tubing of the electrode perforated side downward hori zontally into the top part of the sensorcheck Make sure that the perfora tions are inside the sensorcheck To avoid temperat...

Page 46: ...the electrode to the Hydromette by means of its cable 9 Electrode RF T 28 While avoiding a change of temperature allow the electrode to be ex posed to the atmosphere of the sensorcheck as stated on the packaging e g 10 min 1 min Electrode RF T 31 Proceed in the same way as with the electrode RF T 31 Electrode RF T 32 When testing the RF T 32 electrode double the exposure time stated on the packagi...

Page 47: ...45 R H is recommended At completion of such a conditioning process a re calibration may be found unnecessary as the original deviation had been caused by the effect of sorption If re calibration is needed the test and calibration fluid SCF 70 should be used Preparation and general procedure is as outlined in paragraph Testing 1 to 9 c Re calibration is done by means of a small straight screwdriver...

Page 48: ...alibrating mistakes caused by the sorption effect it is necessary to allow an exposure time of 6 to 7 hours for the electrode RF T 32 This special calibration is done under consideration of the longer exposure times following the instructions given in paragraphs Testing and Re Calibration To return a specially calibrated electrode to normal usage it must be re calibrated according to paragraph Re ...

Page 49: ...ing PT 100 temperature probes Set selector switch 3 UNI 1 or 4 UNI 2 to position 200 C or 600 C Connect temperature probe to meter socket 1 UNI 1 or 2 UNI 2 Press measuring key 4 UNI 1 or 5 UNI 2 and read off result in C displayed by the LCD readout 2 UNI 1 or 3 UNI 2 Measurement using active electrode IR 40 Set selector switch 3 UNI 1 or 4 UNI 2 to position M Connect infrared temperature probe to...

Page 50: ... be pushed through the middle In the case of surface measurements with temperature probe OT 100 the block of polyester or rubber foam with a length of side of at least 30 mm will be sufficient to protect against convection heat or cold when taking temperature measurements on walls In the case of materials which are poor heat conductors or of low heat content e g rockwool glasswool etc it is often ...

Page 51: ...suring location for approximately 10 to 15 minutes or until temperature equalization The measuring range from 10 to 80 C only applies to the sensor tip length of the protective cap of the electrode The electrode tube with electronics and the measuring instrument may be exposed to temperatures above 50 C only for a shor t time For the instrument and probes if possible do not allow the operating tem...

Page 52: ... the spring loaded tip of the probe by exerting excessive pressure or by bending the tip Use of the Surface Temperature Probe OTW 90 The OTW 90 is an angled special probe with low mass for measuring surface temperatures It is specially designed for measurements in plate presses with an aperture of at least 17 mm For measurements on rough surfaces coat the sensor head with heat conducting paste and...

Page 53: ...uring temperatures in liquids and semi solid materials e g frozen materials and for measuring core temperatures in pre drilled holes Dip the sensor tip to a depth of at least 4 cm into the liquid or stick it into the material to be measured and take the reading When measuring core temperatures keep the hole as small as possible Remove dust from the hole and wait for heat generated during drilling ...

Page 54: ...ng drilling to dissipate Coat sensor tip with heat conducting paste insert and take the reading Shallow holes can be directly filled with heat conducting paste Depending on the material to be tested the response time lies between approx 10 seconds liquids and 120 seconds Use of the Air Gas Temperature Probe LT 20 The LT 20 is a special probe for measuring temperatures in air or gaseous mixtures Ho...

Page 55: ...n the material to be measured the response time lies between approx 10 seconds liquids and 180 seconds Use of the Immersion and Combustion Gas Temperature Probe TT 40 The immersion probe TT 40 is a special sensor for measuring temperatures in liquids and core temperatures in pre drilled holes as well as in combustion and waste gas of burners The sensor tube has a length of 480 mm Dip the sensor ti...

Page 56: ...fluenced at certain points by another temperature surrounding air temperature Therefore it is recommended paying particular attention to ensuring that in the case of temperatures below 60 C the sensor be immersed in the medium completely minimum 6 cm For measuring interior temperatures storage bays dry kilns etc the sensor should be attached to a well ventilated point For measurement in bulk mater...

Page 57: ...easuring range 20 C to 199 9 C Resolution 0 1 C Emission factor 95 permanently set Dimensions Length 185 mm x 36 mm x 33 mm Coiled cable 320 1200 mm long Admissible ambient conditions Storage 5 C to 40 C 80 R H maximum not condensing Operation 0 C to 50 C 90 R H maximum not condensing ...

Page 58: ...and converts it into a voltage signal This signal is converted in the display device into the measurement unit Degrees Centigrade Advantages over contact measurement Very quick response and measurement time No removal of heat from the measurement object No damage or contamination of the measurement surface Measurement of electrically live or moving parts Measure Turn selector switch 3 UNI 1 or 4 U...

Page 59: ...ation in the immediate vicinity of hot or cold parts waste gas pipe radiant heater or refrigeration equipment the measurement value may be falsified After waiting for about 10 15 minutes as dictated by the temperature difference a new measurement can be taken temperature equalization between the sensor housing and the ambient temperature The accuracy of the measurement depends on the temperature u...

Page 60: ... of electromagnetic or electrostatic sources Degree of emission The measurement sensor is set to a degree of emission of 95 This value covers most building materials synthetic materials textiles paper and non metallic surfaces The following list is used to estimate the emission factor which is affected by among other things the shine and roughness of the object being measured Flat and shiny surfac...

Page 61: ...nt x 100 ________________________________ T ambient T measurement object Degree of emission Table of degree of emission for the range 0 200 C Asbestos 95 Marble 90 to 95 Asphalt 90 to 95 Paints 90 to 95 Bitumen 98 to 100 Paper 95 Brickwork rough 90 to 95 Plaster 90 to 95 Cement 90 to 95 Plastic materials 90 Ceramics 90 to 95 Roofing fabric 95 Clay 95 Sand 90 Concrete 95 Textiles 95 Earth 95 Wallpa...

Page 62: ...he measurement spot diameter increases proportionally in a ration of approx 2 5 1 the greater the distance between the measurement sensor and object At a distance of 100 mm the measurement spot diameter is 45 mm We recommend a measurement distance between the measurement object and sensor of 20 to 50 mm The relevant diameter can be determined with the aid of the following diagram ...

Page 63: ...ey 5 and read off result displayed by the LCD readout 3 Convert reading into per cent of moisture by means of scale graphs listed at the end of this section Connection of the Electrodes Different electrodes can be used with the meter depending on the material to be tested The electrodes are connected to the meter socket 1 by means of the measuring cable MK 8 On the meter side this cable is fitted ...

Page 64: ... Surface Measuring Caps M 20 OF 15 Ref No 4315 for moisture measurements on surfaces e g concrete without damaging the material only in conjunction with electrode M 20 Stick in Electrode pins M 20 Bi 200 300 for measurements in depth of non apparent construction materials behind another panel with insulated shank only in conjunction with the handle of the electrode M 20 200 mm long Ref No 4360 300...

Page 65: ...ents of hard and soft building materials without contact paste measuring depth up to 100 mm Stick in Electrodes M 6 Ref No 3700 for testing hard building materials using contact paste and pre drilled holes with pins 23 mm long Ref No 4620 40 mm long Ref No 4640 60 mm long Ref No 4660 ...

Page 66: ...n with the handles of the electrodes M 6 size 10 x 0 8 x 200 mm Ref No 3702 size 10 x 0 8 x 300 mm Ref No 3703 Stick in Electrodes M 6 150 250 especially thin and uninsulated pins for testing building and insulating materials through the joint or cross joint of tiles Size 150 x 3 mm Ø Ref No 3706 Size 250 x 2 mm Ø Ref No 3707 for use with M 6 and M 20 electrodes ...

Page 67: ...00 to ensure good contact between electrode pins and tested building materials For moisture measurements in hard building materials cement flooring concrete etc with electrodes M 6 and M 21 Active Electrode MB 35 Ref No 3770 with integrated measuring circuit designed for surface measure ment of concrete in particular prior to coating or gluing Measuring range 2 to 8 m c of dry weight according to ...

Page 68: ...ring instrument and the standard and optional accessory Measuring Cable MK 8 Ref No 6210 for connection of the electrodes M 6 M 18 M 20 M 20 HW M 20 Bi and M 21 Rechargeable Battery with Charging Unit Ref No 5100 for use instead of 9 V dry battery supplied as standard ...

Page 69: ...68 Test Devices Test Standard Ref No 6070 for checking the wood moisture measuring section of building materials Test Standard Ref No 6073 for checking the active electrode MB 35 ...

Page 70: ...th the electrode M 20 Drive in Electrode M 20 For penetration measurements up to a depth of 70 mm on soft set building materials gypsum plaster etc drive electrode pins into the material to be tested the electrode body is of impact resistant plastic Take care that both pins of the electrode are driven only into the material to be tested When withdrawing the electrode the pins can be loosened by sl...

Page 71: ...t approx 10 cm apart into the material to be tested Both electrodes have to be inserted into the same type of building material Also the section to be measured must be coherent and not be crossed by another material If the material is too hard to press in the electrodes by hand e g cement flooring concrete etc drill 6 mm holes and fill them with contact paste Then stick the pins into the contact p...

Page 72: ... materials allow a measuring depth of up to 100 mm or 250 mm respectively Insulated sleeves prevent the results from being distorted by a high degree of surface moisture such as dew or rain Drill two 10 mm dia blind holes approx 8 cm or 10 cm apart the section to be measured must be coherent and consist of the same material It is very important that a sharp drill is used at low speed Where a lot o...

Page 73: ... an extension to the electrode point The moisture displaced by the drilling process is reconducted to the material to be measured by the water contained in the highly conductive contact paste The surface of the material to be measured must not be smeared with the contact paste as the latter has a high conductivity When using the M 6 electrodes it is advisable for an appropriate amount of the paste...

Page 74: ... M 6 150 250 The very thin electrode pins are specially designed for testing building or insulating materials for moisture content if the pin holes shall be kept as small as possible The two 2 mm dia pins made of ductile high grade steel can for example be sticked approx 3 to 5 cm apart through the edge joint to the cement flooring into the insulating layer For use of these pins being specially de...

Page 75: ...ould be obtained A tolerance of 2 digits is admissible Equilibrium Moisture Content What are generally referred to as equilibrium moisture value relates to an ambient temperature of 20 C and an ambient air humidity of 65 R H Thes e values are frequently also termed air dry They must not however be confused with the values at which the material can be processed or worked Before painting or laying a...

Page 76: ...re corresponds to its mean equilibrium moisture under the changing ambient conditions to which the material is constantly exposed Air humidity values for Central Europe lie in the range of approx 45 to 65 R H in summer and approx 30 to 45 in winter A lot of damage occurs in winter particularly in centrally heated rooms as a result of these great swings It is not possible to set universally valid v...

Page 77: ...76 Table of Comparison Air Humidity Structural Moisture ...

Page 78: ...uilibrium moisture attained White black section equilibrating phase Caution Floor covering or glues im pervious to moisture should not yet been processed Black section moist Performing any work should be avoided It should be noticed that a state of complete moisture equilibrium is usually achieved only after 1 2 years Vapour barriers and long term ambient humidity are decisive factors ...

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Page 86: ...he dry inside and the damp outside of a wall may show how the drying process is progressing Insulating materials e g rock or glass wool plastic foams etc cannot be measured in their dry condition due to their great insulating capacity Readings fluctuate widely and even give minus values due to endogenous statics Damp to wet insulating materials can be measured in the range of 20 100 digits or scal...

Page 87: ...ctness of this information The conclusions to be drawn from the measurement results by each user are governed by the individual circumstances and experiences and knowledge gained in the course of his professional practice In case of doubt which moisture content e g of the undercoat for a paint or of the sub flooring for a floor covering is still permissible the user should ask advice from the manu...

Page 88: ...anty period When lodging a warranty claim return the meter complete with all accessories postage paid to GANN or to the supplier together with a description of the fault noticed This warranty does not cover batteries cables and electrode pins GANN assumes no responsibility for damage or faulty performance caused by misuse or careless handling or storage or where repairs have been made or attempted...

Page 89: ...ctive both with respect to its conception and type of construction and the design as marketed by us This declaration becomes void if the moisture meters are modified without our approval Applied harmonized standards in particular EN 55011 03 91 DIN VDE 0875 11 07 92 DIN EN 50082 1 03 93 Applied national technical standards and specifications IEC 1000 4 2 1995 IEC 1000 4 4 01 95 IEC 801 3 1984 IEC ...

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