LOF 1.1 and LOF 500/NB 220 Fibre-optical Overfill Protection System
43Pages

Overfill Protection System LOF 1.1 and LOF 500/NB220Page 4/43 >

The overfill protection system has been developed, manufactured and tested inaccordance with the state of the art and the recognised rules of safety engineering. Nevertheless, it could be hazardous. Therefore, please observe the following safety instructions. > The safety instructions contained in this manual are highlighted as follows: If you fail to observe these safety instructions, there will be a risk ofan accident or the LOF1.1.., LOF500../NB220.. overfill protection system may be damaged. Useful information to ensure that the overfill protection system operatesproperly or make your...

Overfill Protection System LOF 1.1 and LOF 500/NB220Page 6/43 >

1 Level detector 2 Transducer > Eu 3a Annunciator 3b Control device > (1)(2)(3a)(3b)(3c)Binary signal(4) 3c Actuator of the controldevice 4 Signal amplifier Fig. 1: Schematic diagram of the overfill protection system > Overfill Protection System LOF 1.1 and LOF 500/NB220Page 7/43 >

2.2General designThe level detectors consist of a probe tube, which reaches into the tank andcarries a sensor, protected against mechanical damages, on its bottom end. The corresponding probe length is permanently imprinted at the top end of the probe.2.2.1Level detector LOF1.11..This level detector is the LOF standard version and can be used in almost allapplication areas. The transducer electronics are installed in a stainless steel housing located directly on the probe tube (see Fig.2a2d).The level detector can optionally be equipped with an electric plug-in connectionfor a comfortable...

2.2.5Height-adjustable level detector LOF..E with screw-in unitLOF level detectors with the additional designation "E" are fitted with a screw-in unit, which is used to adjust the probe tube and the response length to a particular height depending on the tank size (see Fig.2a, 2c, 2e).2.2.6Level detector LOF..F with flangeWith LOF level detectors with the additional designation "F" the probe tube iswelded to the flange and thus can not be adjusted in height (see Fig.2b, 2d, 2f).2.2.7Level detector LOF..S with larger probe tube diameterThe probe tube of LOF level detectors with the...

Overfill Protection System LOF 1.1 and LOF 500/NB220Page 15/43 >

3.2.5Transducer NB220QSApart from the green and the yellow LED the NB220QS is equipped with afurther red lamp, a buzzer, and an acknowledge key for indicating and confirming malfunctions:The red alarm lampՖis lit, if the liquid level has reached or exceeded the maximum permissibleheight, or if there is an overfill protection system error.goes out, if the cause of the malfunctions has been corrected, i.e. the leveldetector has re-emerged out of the liquid or the overfill protection system error has been corrected.֕The buzzersounds, if the liquid level has reached or exceeded the maximum...

When installing the overfill protection system please observe thefollowing safety instructions:During all work on the overfill protection system always observethe national safety and accident prevention regulations as well asthe generally recognised rules of engineering and all the safetyinstructions in this manual.ՕWiring may only be carried out when the equipment is disconnectedfrom the mains.The transducer must be installed in closed rooms or in a housing withIP 54 protection. The housing protection class for closed rooms differsdepending on the transducer version (see Chap."Technical...

H Tank height S Stub/sleeve height A Response level Z Probe length L Response length Y Reference dimension Fig.3: Alignment dimensions of the level detector > Overfill Protection System LOF 1.1 and LOF 500/NB220Page 18/43 >

Connectionto transducer Connection to transducer: 1 (brown) + 3 (blue) Fig.4b: Connecting level detector LOF..SteckDD28 plug(counter plug not included in scope of delivery)Fig.4c: Connecting level detector LOF..M12M12 plug(counter plug not included in scope of delivery) The transducer may only be set up outside the area subject toexplosion hazards. The housing protection class differs depending onthe transducer version (see Chap."Technical data"). The length of cable from the level detector to the transducer must not be morethan:250 m in the case of 0.5mm > 2 Օ500 m in the case of 1 mm > 2...

Level detectorLevel detector output,to annunciator/control deviceOutput "S" or "Z" (option)Auxiliary power Fig.4d: Connecting the transducer LOF500 > d2, z2: Level detector 1d8, z8:Level detector 2d18, d20, d22:Level detector 1 outputd24, d26, d28:Level detector 2 outputd/z30, d30, z32:Auxiliary power d2, d4:Level detectord16, d18, d28:Level detector output, to annunciator/control deviced22, d24, d26:Output "S" or "Z" (option)d/z28, d30, d32:Auxiliary power Fig.4f: Connecting the transducerLOF50019"Duo Overfill Protection System LOF 1.1 and LOF 500/NB220Page 21/43Fig.4e: Connecting the...

Level detectorLevel detectoroutput, to annunciator/ control device Auxiliary power Level detectorOptions for externalconnection Attention: Outputs are energised! External annunciators and control devices must be connected between terminals 4 and 8 to monitor auxiliary power! Auxiliary power >

If the level detector is installed in tanks outside buildings, an overvoltageprotection is to be provided in the detector signal line, unless the detector signal line is guided in a metal tube or a metal cable conduit, that is connected to tank potential or integrated into the equipotential bonding system.To install the overvoltage protection:1.Mount the overvoltage protection of type BA350 in a distance of approx.50cmto the level detector.2.Connect the overvoltage protection housing to the tank using a 4-mm > 2 -cableand the external earthing terminal. > Overfill Protection System LOF 1.1...

C to +50 а CHousing protection class:In enclosed rooms:LOF500, LS500S/Z, NB 220 H/QS: IP 40 LOF50019"..:IP20 In the field: IP54Dimensions:LOF500, LS500S, LS500Z:150x75x110LOF50019"..:160x100, 7TE, 3HE,DIN41612F, European PCBNB 220 H:110 x 51 x 110 NB 220 QS:150 x 75 x 110 AC: ≤ 250 V, ≤ 4 A, cos ϕ ≤ 0.7, 500 W max.DC: Change-over contact carrying capacity: Pump, solenoid valve, etc. (terminal4, 8): 230 V, 50 Hz, 50 W max. External lamp (terminal5, 8): 230 V, 50 Hz, 100 W max. External acknowledge key (terminal5, 7): 230 V, 50 Hz External horn (terminal9, 8): 230 V, 50 Hz, 50 W max.Ambient...