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11 Carrying out maintenance work

The OTT CBS bubble sensor itself is maintenance free. We recommend that the
measuring tube and bubble chamber are checked at regular intervals as des-
cribed below and cleaned as required:

11.1 Activating purge function

Activate the purge function of the OTT CBS quarterly by pressing the membrane
button 

Pump (see also Fig. 14) and checking whether air bubbles rise out of the

bubble chamber. If not, check whether the bubble chamber is blocked, and/or
whether the measuring tube is leaking or blocked.

11.2 Cleaning bubble chamber

Check the bubble chamber quarterly for sand buildup and weed infiltration. For
light sand buildup, clean the bubble chamber using the purge function, and for
heavier buildup or weed infiltration clean the bubble chamber carefully manually
(do not change the position of the bubble chamber).

11.3 Testing the measuring tube

After 15 years' operation, test the measuring tube for tightness/pressure resis-
tance roughly every 2 years.

Never open the housing of the OTT CBS! There are no adjustment or control
elements inside the housing!

In the case of device defects, contact the OTT Repaircenter:

OTT MESSTECHNIK GmbH & Co. KG
Repaircenter
Ludwigstrasse 16
87437 Kempten 

∑

Germany

Tel.

+49 (0)831/5617-433

Fax

+49 (0)831/5617-439

[email protected]

25

Содержание CBS

Страница 1: ...English Operating instructions Bubble Sensor OTT CBS...

Страница 2: ...We reserve the right to make technical changes and improvements without notice...

Страница 3: ...oSens using a 4 20 mA interface 16 7 Activating the purge function 18 8 Setting operating parameters using DIP switches 19 8 1 Setting the type of SDI 12 interface 19 8 2 Setting measurement type of t...

Страница 4: ...tion measuring tube with 4 mm 2 mm external internal diameter transparent PE 50 m 99 420 009 9 5 100 m 99 420 008 9 5 Measuring tube 6 mm 4 mm with sheathing Length as requested 20 500 133 5 5 Measuri...

Страница 5: ...the bubble chamber into the water to be measured The pressure created in the measuring tube is directly proportional to the water column above the bubble chamber The OTT CBS determines the barometric...

Страница 6: ...occur the OTT CBS has a Status LED see Fig 1 Various operating parameters can be set using the eight DIP switches Bubble pot EPS 50 Groundwater bubble chamber Measuring tube Fig 2 The main layout of...

Страница 7: ...free location for the installation such as a gage station or control cabinet First attach the OTT CBS on the upper edge of the top hat rail and then press the underside against the top hat rail until...

Страница 8: ...short factory mounted measuring tube from the connection nozzle Push cap nut over the measuring tube 4 mm Push measuring tube onto the connection nozzle Push the cap nut back onto the connection nozz...

Страница 9: ...allation Lay the measuring tube such that there is a continuous drop from the OTT CBS towards the bubble chamber Otherwise moisture could collect in a hollow and potentially block the tube with the fo...

Страница 10: ...pension cable from being twisted off it can be melted with a cigarette lighter for example Feed the suspension cable through the hole in the bubble chamber as shown in Figure 6 and tie firmly Slide co...

Страница 11: ...s are used ensure the suspension cable is attached securely Check all knots and attachments for correct position and firmness Lower the bubble chamber slowly into the observation well with the suspens...

Страница 12: ...that has the correct inter faces The SDI 12 interface meets SDI 12 Standard 1 3 SDI 12 Serial Digital Interface with 1200 baud All electrical connections are made using two screw terminal strips suppl...

Страница 13: ...ly to screw terminal strip A of the OTT CBS as shown in Fig 8 Notes The OTT CBS does not have a switch for switching the unit on and off As soon as power is supplied the OTT CBS is ready for operation...

Страница 14: ...recommended cable cross section 0 25 mm2 Connect the OTT CBS as shown in Figure 10 to the LogoSens 2 Station Manag er or to the DuoSens Compact Data Logger Take note of the operating instruc tions fo...

Страница 15: ...alues of the OTT CBS Allocation of the further four values of the OTT CBS to virtual terminals level in cm level in ft pressure in mbar pressure in psi temperature in C status see Chapter 9 command aM...

Страница 16: ...R DuoSens C F terminal block used screw terminal strip of the LogoSens 2 DuoSens Measuring mode Set to I 4 20 mA ext only with DuoSens Sensor lag time s switches on the LogoSens 2 DuoSens input x sec...

Страница 17: ...y out the inversion of the value via function 2 point scaling e g for an OTT CBS with 15 m measuring range and depth measurement DIP switches 5 6 ON Point 1 4 15 Point 2 20 0 In the relevant Channel f...

Страница 18: ...activated purge function the CBS pumps a large amount of air through the measuring tube for the required time period see also Chapter 11 The purge function can also be activated via an SDI 12 command...

Страница 19: ...e 4 20 mA or SDI 12 no parallel operation of the inter faces Possible types for the SDI 12 interface Standard SDI 12 interface protocol and physical interface SDI 12 SDI 12 via RS 485 interface withou...

Страница 20: ...g range is available DIP switches 5 6 OFF ON 1 2 3 4 5 6 7 8 ON 1 2 3 4 5 6 7 8 ON 1 2 3 4 5 6 7 8 ON 1 2 3 4 5 6 7 8 15 m 50 ft 1 5 bar 25 psi not scaled 30 m 100 ft 3 bar 50 psi not scaled 8 m 25 ft...

Страница 21: ...caled metric system water level measurement ON 1 2 3 4 5 6 7 8 Fig 20 Factory setting of the operating parameters ON 1 2 3 4 5 6 7 8 ON 1 2 3 4 5 6 7 8 Water level measurement Pressure measurement Fig...

Страница 22: ...tttn CR LF Start verification The verification lasts 1 second and provides a value representing the test result D0 a 0 CR LF no error D0 a 1 CR LF level too low 5 cm D0 a 2 CR LF overload measuring ra...

Страница 23: ...ational constant With water density 6 017777e 6 t2 0 0000408 t 0 999841 and with t temperature in C The OTT CBS can calculate the water density at any time using the value for the local water temperat...

Страница 24: ...er supply from the following diagram Example Power supply 18 Volt max load resistance 450 Ohm The OTT CBS delivers an output current corresponding to the measured value for a load resistance of up to...

Страница 25: ...le chamber Check the bubble chamber quarterly for sand buildup and weed infiltration For light sand buildup clean the bubble chamber using the purge function and for heavier buildup or weed infiltrati...

Страница 26: ...ws Press Pump membrane button briefly 1 second otherwise the purge function is called the LED lights once for a longer period as confirmation Pause 1st error state arising e g flashing once Pause 2nd...

Страница 27: ...ay Dimensions L x W x H 165 mm x 205 mm x 115 mm operating display elements DIP switches setting operating parameters eight Pump membrane button Call purge function display error status using LED Stat...

Страница 28: ...OTT MESSTECHNIK GmbH Co KG Ludwigstrasse 16 87437 Kempten Germany Phone 49 0 831 5617 0 Fax 49 0 831 5617 209 info ott hydrometry com www ott hydrometry com Document number 63 200 001 B E 03 0207...

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