Operating Instructions
Contents
1. C Q U 2 N a O L 00 Pressure Probe ODS 4 K YZlct HO a Fig 1 Principle configuration of a water level measuring point with the OTT pressure probe ODS 4 K Humidity absorber FAD 4 serves as con nection point for the probe cable and the data line and it dehumidifies the ambient air that reaches the pressure compensation capillary tube of the probe cable The pressure probe contains a terminal strip which allows the connection of cables of individual lengths 1 Introduction Pressure probe ODS 4 K is used for precise measurement of ground and surface water levels For this purpose the pressure probe determines the atmospheric pressure of the water column on a reference pressure measuring cell A pressure compensation capillary in the probe cable provides the measuring cell with the current ambient air pressure as a reference Thus faulty measuring results caused by atmospheric pressure fluctuations are avoided Depending on the version the pressure probe provides an analogue output signal direct proportional to the water level The output signal is between 1 and 5 Volt or A and 20 mA This allows universal usage of the pressure probe for example for activation of recorders alarm devices switching contacts or data loggers as well as the indi cation of measuring data in connection with a display device Humidity absorber FAD2. 4 accessory Cable __ suspension bracket accessory Data line Probe e g to cable OT LOG data logger accessory i eae Water level Pressure probe ODS 4K 2 Safety Instructions Only use the pressure probe ODS 4 K and the accessories as described in these operating instructions Pressure probes with probe cables that have been connected by yourself must only be used for measurement points with a maximum water level of 50 m For higher water levels only use probes with factory installed probe cables Open the pressure probe only for connecting the probe cable Do not under any circumstances remove the set screws in the center of the probe housing Before lowering the pressure probe check whether the probe cable is connec ted correctly Otherwise the probe may get lost In any case strictly adhere to the limit values stated in the technical data section Connect the probe only to voltages smaller than 15 V DC 1 5 V version respectively 26 V DC 4 20 mA version Always use an electrically decoupled safety low voltage as power supply Observe carefully 3 Installing the Pressure Probe 3 1 Notes on the Mounting Location Pressure probe ODS 4 K can be put to various uses for example in tubes or boreholes wider than two inches in diameter in wells open waters even in non vertical position e g bank slope in not permanently water carrying riverbeds The pressure probe s dead
3. instructions of the decalci fying agent Rinse the pressure probe with clear water Remount the protective cap and screw in both set screws Lower the pressure probe with the probe cable into the stilling tube or protective tube Check the measuring value TE CE 8 Technical Data Pressure probe Dimensions x Distance measuring cell probe bottom edge Weight Measuring range Overload protected Material of probe housing Protection against wafer penetration Lightning protection Temperature range Maximum measuring deviation 2 4 m measuring range 10 m measuring range 40 m measuring range 1 5 V Version Supply voltage Current consumption Output signal short circuit proof Formula to calculate the outputsignal 4 20 mA Version Supply voltage Output signal current consumption Load resistance Formula to calculate the outputsignal EMI limit values ESD protection Protection against electromagnetic fields EMF Protection against transient interference burst Protection against lightning impulse voltage surge Conducted and radiated interference capacitive oil free ceramic reference pressure measuring cell temperature compensated 237 mm x 42 mm 25 mm 0 9 kg 4 m 10 m 40 m water column 1 up to max 50 m water column stainless steel 1 4539 V4A 316 synthetics POM presswatertight up to 50 m water column integ
4. al block Push the capillary tube ends about 5 mm into each other and then place under the circuit board Insert two dessicant bags SILGEL Fit the pipe casing and screw in the set screw Keep the other end of the pressure probe cable sealed with adhesive tape for example until you have assembled the FAD 4 humidity absorber No moisture must be allowed to penetrate the capillary tube while the pressure probe cable is being routed ty Important Do not open the pressure probe after it has been in use When replacing the probe cable at a later time observe the instructions outlined in robe afier use E chapter 6 Replacing the Probe Cable 3 3 Lowering the Pressure Probe First determine the minimum and maximum water levels at the measuring point for example with a stuff gauge or contact gauge Determine the probe position from these two values The following prerequisites must be met Position the probe below the minimal water level Difference between maximum water level and probe position lt measuring range of the probe Example Pressure probe type with 10 m measuring range 1 5 V output built in into a tube with a length of 18 m min water level 12 40 m corresp to a contact gauge value of 5 60 m max water level 16 72 m corresp to a contact gauge value of 1 28 m gt Positioning the probe for example for a water lev
5. clog the capillary tube by conden sate formation and thus could cause inaccurate measuring results Check the color of the indicator in regular intervals The frequency of the intervals is dependant on the overall humidity of the air It is recommended to perform the checks in monthly intervals after the first installation After that the intervals can be increased according to the actual situation Also consider sea sonal climate fluctuations When the indicator changes its color from blue to pink the desiccant cartridge has no more dehumidifying effect and must be replaced by a cartridge with blue indicator The desiccant cartridges can be recycled by drying at 120 130 C in a conven tional baking oven When the color changes to blue again the drying procedure is complete Immediately after cooling off place the desiccant cartridge into the supplied airtight storage container Thus you will always have a usable desiccant cartridge blue color indicator at hand 5 Determining the Maximum Load Resistance for Pressure Probes with Output Signal 4 to 20 mA i The load load resistance of a pressure probe must not exceed a certain maximum value This value depends on the supply voltage of the pressure probe If the load resistance is higher the output current can no longer be evaluated Smaller loads are of course acceptable without problem Observe for pressure probes The maximum load for the different applications
6. dge into the free space above the terminal strip The color indicator in the center of the cartridge must be blue Immediately replace the transparent cover and secure with 4 knurled screws Fig 8 Connection example of the humidity absorber to a pressure probe with 4 20 mA output Desiccant Kevlar loop cartridge OT 0 12 GB Note Do not remove cable screw bushing with filter insert It provides protection against moisture and dust Cable screw Capillary bushing with tube filter insert Cable screw bushings ene Eu PG11 13 5 4 Data line Probe cable Table 1 Output signals of the pressure probe 1 5 Volt version terminals 2 3 4 20 mA version terminals 1 2 Current caused by the probe supply he ar Check the color indicator in regular intervals Terminals Wire assignment in the FAD 4 PS A a yr a 1 white ewer U wer 2 brown O Vout O V ower 3 green U out __A yellow 0 4 3 Checking the Desiccant Cartridges The desiccant cartridges are filled with material that absorbs moisture from the ambient air Through the desiccant and by a special moisture repellent filter in the cable screw bushing on the side the air in the humidity absorber is dehumidified This prevents moist ambient air caused by temperature and air pressure fluctuations from entering the capillary tube Moisture could
7. el of 10 m Output signal at a water level of 16 72 m 3 688 V Lower the pressure probe at the probe cable to the determined depth Hint The cable has markings at 0 25 m intervals Place the cable suspension onto a hook Insert the probe cable into the opened clamp jaws of the cable suspension and fasten the cable by pushing together the clamp jaws Depending on the usage the fine adjustment of the probe position may be per formed with downstream electronic offset control for example If the measured value is to be referenced to a zero level this can be achieved by an input to the evaluation software of the connected peripheral device Therefore in most cases a coarse positioning of the probe is sufficient In not permanently water carrying riverbeds the pressure probe delivers a continuous output of 1 V respectively 4 mA in dry condition 4 Installing Humidity Absorber FAD 4 4 1 Introduction Humidity absorber FAD 4 has two functions Dehumidifies the ambient air reaching the pressure compensation capillary Connects the probe cable with the data line via a terminal strip t Fig 5 Humidity absorber FAD 4 The humidity absorber contains a desic Desiccant Color indicator cant cartridge The color indicator shows cartridge the degree of moisture absorption Blue OK Pink saturated replace OH 00214 68 4 2 Mounting the FAD 4 Mount the humidity absorber in a place as dry as possible If the abso
8. essure probe is made of high quality stainless steel and synthetic material Nevertheless damaging corrosion may occur depending on the installation location For further Information refer to the technical data section Mounting the pressure probe is easy and comprises three steps Connecting the probe cable to the pressure probe Lowering submerging the pressure probe Mounting the humidity absorber FAD 4 3 2 Connecting the Probe Cable to the Pressure Probe For measuring ranges of water levels up to 50 m you may connect the probe cable yourself to the probe This step is not required when using a pressure probe with factory installed probe cable Important When connecting the probe cable there must not be any impurities dust sand in the area of the sealings o rings pipe casing cable screw bushing probe cable Otherwise the probe may not be sealed watertight All measures in mm 45 40 Plastic Rubber Wire enc ring ring Capillary tube ferrules E approx 6 18 Kevlar strings Probe cable Inner z outer sheath sheath 3 r A Proceed as follows Strip the insulating cover from one end of the pressure probe cable as shown in Fig 3 Be careful not to damage cut or bend the capillary tube in the process Tip To facilitate tying of the kevlar strands later we recommend that you first remove the insulation from about 100 mm of the cable outer shea
9. hem Important The o ring seats must be perfectly clean Rub some silicon oil onto the o ring and slip it on important The o ring seats must be absolutely clean Continue as described in Chapter 3 2 Connecting the pressure probe cable to the pressure probe 7 Maintenance Due to the high quality design of the pressure probe no regular maintenance measures are required Even a thin layer of residual deposits at the measuring cell will not cause any relevant distortion of the measuring values If high dirt accumulation occurs due to algae sludge fouling or sediments the pressure probe has to be checked from time to time For example inaccurate or invalid measuring values indicate that the measuring cell is blocked which can be easily seen b cause the zero point has shifted Due to its robust measuring cell the pressure probe can be cleaned unproblematically if required For this purpose proceed as follows Note the current measuring value Pull out the pressure probe with the probe cable from the tube or protective tube When pulling out the probe do not change the length of the suspension For measuring points in surface waters If required dismount and clean the protective tube Remove both set screws and the black protective cap Carefully clean the measuring cell with a brush hard bristles Furring can be removed with conventional household decalcifying agent Make sure fo observe all application notes and safety
10. is shown in the following with 4 20 mA output diagram Example Supply voltage 24 Volt max load resistance 650 ohms Up to a load resistance of 650 ohms the probe will deliver an output current proportional to the measuring value Therefore the connected electrical circuitry has to be rated accordingly check the input resistance of the connected peripheral device For cable lengths gt 100 m also consider the conductor wire resistance of the probe cable approx 37 ohms per 1000 m of cable Fig 9 Diagram for determining the maximum load resistance in relation to the supply voltage OTT 00206 0 Minimum supply voltage Maximum supply voltage 26 V a as es ee soe ee y 26 25 20 15 13 10 A Aaaa a tN e TE Fig 10 Spare parts kit Set screw 2 x housing Measuring cell Protective cap tt tet A Fig 11 Cleaning the measuring cell OFT 90178 a 5 3 8 5 6 Replacing the Probe Cable If required the probe cable can be easily replaced at a later point in time Also replace both o rings and the entire cable screw bushing of the pressure probe thus ensuring that the pressure probe stays sealed after the replacement For this purpose a spare parts kit is available from OTT Order number 55 410 083 9 2 Remove old o rings Rub silicon oil into the new o rings and then fit t
11. probe cable of custom length Customized as standard but with ready made probe cable Order numbers ODS 4K 1 5 V Measuring range Designation Order number Output O 4m 4 0 PV 63 035 311 9 2 0 10 m 10 63 035 313 9 2 0 40 m 40 63 035 315 9 2 0 20m 20PY 63 035 029 4 5 3 0 100 m 2 100 PV 63 035 031 4 5 3 0 200 2 200 PY 63 035 032 4 5 3 4 20 mA i g Output O 4m 4 0PA 63 035 331 9 2 0 10 m 10PA 63 035 333 9 2 0 40 m 40 PA 63 035 335 9 2 0 20m 20 PA 63 035 029 4 5 4 0 100 2 100 PA 63 035 031 4 5 4 0 200 2 200 PA 63 035 032 4 5 4 1 Special design 2 starting at a measuring range of 50 m only ready made at the factory 3 Basic type 63 035 310 9 2 pressure sensor 4 Basic type 63 035 330 9 2 pressure sensor Accessory Probe cable A wire with pressure compensation 97 000 018 4 5 capillary and kevlar core per m Humidity absorber FAD 4 00 63 035 107 3 2 2 desiccant cartridges 1 storage container 10 wire end ferrules 1 mm Straight cable suspension 97 140 071 9 5 Angular cable suspension 20 450 133 4 1 Suspension bracket for ORG 46 top cap 55 410 069 4 2 Data line 96 000 035 9 5 Type LIYCY 5 x 0 14 mm per m Spare parts Spare parts kit 1 55 410 083 9 2 1 cable screw bushing with buckling protection sleeve 2 o rings 1 plastic ring 1 rubber ring 6 wire end ferrules 1 mm
12. rated 9 5 to 45 C 0 25 93 241 om 0 1 47241 em 0 1 XIE 4 em 8 15 Volt DC typ 12 V max 4 mA 1 5 U 1 y gt Water level x 4 V pie measuring range 13 26 Volt DC typ 24 V 4 20 mA max 750 9 4 mA aer level x 16 mA su measuring range fulfills EN 61000 4 2 Intensity 3 8 kV air discharge fulfills EN 61000 4 3 Intensity 3 10 V m fulfills EN 61000 4 4 Special intensity 4 ky fulfills EN 61000 4 5 Intensity 4 4 ky fulfills EN 55022 Class B Notes on Mounting Location and Mounting Type The following factors lead to increasing corrosion of the pressure probe Water pollution by chemical solvents Particles of low alloyed steels e from sheet pile walls rust film Low oxygen water gt select mounting location with sufficient water flow Chloride also evaporating from synthetics do not use protective tube made of PVC Fixation of the probe housing with clamp fittings also made of plastic Additional encapsulation of the probe housing If possible submerge the pressure probe only temporarily for measuring into the water and remove after measuring is complete if the environmental conditions are critical 1 Special version for water column up to 200 m 2 at 20 C 3 of the measuring range 4 Load resistance gt 20 KQ Scope of delivery ODS 4K Standard 1 pressure probe with reference pressure measuring cell including terminals for connecting a
13. rber is mounted in a switch cabinet it is important that pressure compensation with the ambient air is possible cabinet must not be hermetically sealed Proceed as follows Remove the transparent cover Mount the humidity absorber onto a solid base with four screws 4 mm j see drilling template Abb 6 Drilling template for mounting the humidity absorber FAD 4 8 8 5 Pass the probe cable through the larger cable screw bushing PG 13 5 Remove the insulation on one end of the probe cable according to figure 7 Do not damage cut or buckle the capillary tube Slip on wire end ferrules and crimp the ferrules onto the wire with a special crimping tool flat nose pliers Form a loop with the kevlar strings Secure the knot with commercially available instant glue superglue Insert a Phillips screw into the kevlar loop see figure 8 Fig 7 Stripping lengths of the probe cable at the humidity absorber side All measures in mm Wire end ferrules The outer and inner sheathes of the pressure probe cable must be cut to a length of 55 mm Capillary tube Kevlar strings approx 80 aaka A 010101212121212 i err Pull the probe cable tight and tighten the screw connection firmly by hand connect the probe cable wires to the terminal strip Connect the data line to the peripheral device or evaluation electronics Place a desiccant cartri
14. th Slip on the wire end ferrules and crimp in place using a special crimping tool flat nose pliers Unscrew the set screw and remove the pipe casing Now slip the following components onto the probe cable pipe casing coupling ring buckling protection sleeve first apply a few drops of silicon oil to the outer pipe sheath screw joint plastic ring and rubber ring see Fig 4 Push the inner sheath of the probe cable together with the plastic and rubber ring into the pressure probe uniil it stops Apply LOCTITE 572 threading seal to the screw joint threading Screw in the joint and tighten securely span of the jaw 24 Insert the buckling protection sleeve into the screw joint fit the coupling ring and tighten very securely span of the jaw SW 24 Now arrange and tie the kevlar strands non tensioned around the pan head screw slightly unscrewed as illustrated in Fig 4 Use ordinary super glue fo fasten the knots in place Important Make sure that the spacer under the circuit board is not skewed during this process Fig 4 Connecting the probe cable to pressure probe ODS 4 K Pipe casing Wire colour 1 white 2 yellow 3 green We bean Buckling protection sleeve G3 3 Screw joint 3 i Plastic ri GS ashe ring 4 Set srew 89 Rubber ring Spacer Lightning protection Kevlar O ring loop Connect the wires on the termin
15. weight prevents the probe body from floating to the surface The pressure probe can be easily fixated in flowing waters or waters with waves When designing the measurement location observe the hydrodynamic influence of strong currents gt 0 5 1 m s Depending on the version and the type of mounting of the individual components underpressure or overpressure may occur which might distort the measuring result The pressure probe is depending on the type and location of mounting saltwater proof Fig 2 Installation example for pressure probe ODS 4 K in open waters in waters with strong currents or waves a locking pin is used for secure fixation of the probe push locking pin through openings in protective tube and pressure probe protective cover locking pin made of synthetics e PE HD do not use PYCI __ Protective plastic tube ORM 0 9 GB NI Notes on the installation in surface waters Avoid any dirt at the connection Fig 3 Stripping lengths of the probe cable at the probe side Non stretching kevlar sirings in the probe cable ensure exact measurement values as the pressure probe is always located in the same depth position The screen between the inner and outer sheath of the pressure probe cable is not connected Important It is not recommended to install the pressure probe in the vicinity of docks industrial waste water discharges or areas with high chemical pollution The pr
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