Remote Switching Unit nivotester FTL 320
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1 Technical Information TI 203F/24/ae Remote Switching Unit nivotester For connection to intrinsically safe Liquiphant level limit switches Applications Limit detection of fluids and bulk solids in tanks and silos; suitable for applications in explosion-hazardous areas Liquid detection in pipes for dry run protection of pumps Overspill protection of tanks containing flammable or non-flammable water-polluting liquids Features and Benefits Intrinsically safe signal circuits [Class I, II, III] for problem-free use of sensors in explosion-hazardous areas High functional safety with: - interference-immune PFM signal transmission - cable monitoring right up to the piezocrystal drive in the sensor - monitoring for corrosion at the vibrating fork of the Liquiphant sensor Compact Minipac housing for simple row mounting on a standard rail in the control cabinet Simple wiring using plug-in terminal blocks
2 Measuring System Explosion-hazardous area a) Class I Liquiphant Safe area (non-ex) Nivotester The measuring system consists of: the Liquiphant or Soliphant sensor the Nivotester control or signaling systems a) Limit detection in a tank containing liquid with one Liquiphant FDL 30, FDL 31, FDL 35, FDL 36 or DL 17 Z sensor b) Class II Soliphant Nivotester b) Limit detection in a silo containing bulk solids with one Soliphant DM 90 Z, DM 91 Z or DM 92 Z sensor Operating Principle The Nivotester is a limit switch for single measuring points. Signal Transmission The intrinsically safe input of the Nivotester limit switch is electrically isolated from both the power supply and the output. The Nivotester supplies DC power to the Liquiphant or Soliphant sensor via a two-wire cable and receives a frequency indicating whether the sensor fork is cove (approximately 50 Hz) or free (approximately 150 Hz). The sensor signal is a pulsed current of approximately 10 ma with width approximately 200 µs which is superimposed on the power supply. Signal Evaluation The Nivotester evaluates the frequency and activates the relay of the level alarm output. The switching mode of the relay is indicated by a LED on the front panel of the Nivotester. Fail-Safe Mode By correct selection of the fail-safe, the relay always operates in a quiescent current mode. Minimum fail-safe: The relay de-energizes when the level falls below the switchpoint (fork free), when a fault occurs or when the power fails. Maximum fail-safe: The relay de-energizes when the level rises above the switchpoint (fork cove), when a fault occurs or when the power fails. Limit detection as a function of level and fail-safe mode Level Signal transmission Maximum fail-safe mode with jumper Minimum fail-safe mode no jumper Fault I approx. 150 Hz PFM signal base current I approx. 50 Hz PFM signal base current Function Monitoring The Nivotester has a function monitoring system to increase operational safety. A fault is indicated by an LED and the relay also de-energizes. A fault is indicated if the Nivotester no longer receives an input signal, for example, on short-circuiting or breakage of the sensor signal cable, corrosion of the Liquiphant fork, defective sensor electronics or input circuit of the Nivotester. Function monitoring can be checked at the terminals of the signal cable.
3 Design and Installation The Nivotester limit switch must be installed in a control cabinet outside the explosion-hazardous area. The Minipac transmitters are designed for single or row mounting on a standard EN x7.5 or EN x15 symmetrical rail. Note the permissible ambient temperatures and the minimum distance allowed between rows of instruments (see Technical Data). Above: Row mounting on standard rail of the only 50 mm wide Nivotester limit switches A protective housing (IP 55) is available for two Nivotester transmitters mounted in the open. Please refer to Supplementary Documentation. Below: Two Nivotesters in one protective housing Electrical Connection Connecting the limit switch Nivotester ( * DC transmitters in preparation) Select the fail-safe mode by inserting or removing the jumper at terminals 12 and 13. For easy wiring, the removable terminal blocks are separated according to whether they are intrinsically safe connections (upper) or non-intrinsically safe connections (lower). Connecting the Sensor (to the upper terminal block) The two-core connection cable between the Nivotester and the Liquiphant or Soliphant sensor can be common, unshielded installation cable or two cores of a multicore cable. Cable resistance max. 25 Ω per core. Without jumper minimum fail-safe With jumper maximum fail-safe U~ or U _ * L1 N Nivotester L1 N PE L+ L _ Power supply Liquiphant or Soliphant Level alarm Non-Ex The cable should be shielded if it is to be laid in areas with strong electromagnetic interference, such as that caused by machines or walkie-talkies. Connect the shielding to the ground connection in the sensor only. Do not connect it to the Nivotester. Explosion-Hazardous Areas: Please observe all local regulations on explosion protection concerning the type and installation of intrinsically safe signal cabling. Please refer to the certificate of conformity for maximum permissible values of capacitance and inductance. Connecting the Signal and Control Systems (to the lower terminal block) Note relay function with regard to level and fail-safe mode. If an instrument with a high inductance is connected (for example, contactor, magnetic valve, etc.), then a spark arrester must be provided to protect the relay contact. Connecting the Power Supply (to the lower terminal block) See Order Code. A fine-wire fuse is not requi as there is a fuse in the power supply circuit. The DC version of the Nivotester has protection against reverse polarity.
4 Replacing the Instrument FTL 120 Z L1 N NO or NC Replacing the Previous FTL 120 Z Version with the Latest Nivotester Please note: The signal cable connection, fail-safe mode and the power supply connection are identical on both instruments. L1 N PE Power supply L1 N Normally-open or normally-closed contact The jumper between terminals 3 and 4 must be removed. The relay contact between terminals 5 and 6 on the FTL 120 Z can be connected as a NO or a NC contact. With the, this part of the change-over contact performs as a normally closed contact. (Quiescent current fail-safe mode: this contact is closed in cases of level alarm and fault.) Change the wiring if necessary! L1 N PE Please also note the information given in the approval certificates. The wiring of the lower terminal block must be modified Power supply change-over contact Technical Data Construction Housing: row housing (Minipac) in plastic Mounting: on standard rail to EN x7.5 or EN x15 Protection to DIN 40050: Housing IP 40, terminals IP 20 Weight: 11.3 oz. (320 g) Operating Data Permissible ambient temperatures single mounting: Nominal operating range: 32 to 140 F (0 to +60 C) Limits of operating range: -4 to 140 F ( _ 20 to +60 C) with row mounting without side spacing: Nominal operating range: 32 to 122 F (0 to +50 C) Limits of operating range: -4 to 122 F ( _ 20 to +50 C) mounted in protective housing (2 units): Nominal operating range: 32 to 104 F (0 to +40 C) Limit of operating range: -4 to 104 F ( _ 20 to +40 C) Storage: -13 to 185 F ( _ 25 to +85 C) Climatic operating class to DIN 40040: K U E Temperature range: 32 to 158 F (0 to +70 C) relative air humidity: annual mean max. 75% for 30 days continuously in the year max. 95% for other days occasionally 85% infrequent and light dew Interference-proof against electromagnetic fields: 10 V/m, 10 khz to 1 GHz, conf. to IEC DIN VDE 0843 (Part 3), EN and NAMUR recommendations Interference source below that stated in EN standards Power supply AC version: Voltage ranges see Order Code Power consumption max. 3 W DC version: Voltage range: 20 to 30 V Permissible residual ripple within tolerance: U pp = 2 V Current consumption: max. 56 ma Power consumption : max. 1.7 W Integrated fine-wire fuse (with protection against reverse polarity) Signal Input Input : electrically isolated from power supply and output Sensors: Liquiphant DL 17 Z, FDL 30, FDL 31, FDL 35, FDL 36, Soliphant DM 90 Z, DM 91 Z, DM 92 Z Power supply to sensor: supplied by the Nivotester Connecting cable: two-core, shielding not requi, Cable resistance: max. 25 Ω per core Signal transmission: Pulse Frequency Modulation (PFM) See approval certificates for further specifications.
5 Output Relay output: one potential-free change-over contact for level alarm Quiescent current fail-safe mode: Minimum/maximum fail-safe mode, selectable by jumper on the terminal block Switching delay: approx. 0.5 s Switching capacity of relay contacts: U~ max. 250 V I~ max. 6 A P~ max VA at cos ϕ =1 P~ max. 750 VA at cos ϕ 0.7 U _ max. 250 V I _ max. 6 A P _ max. 200 W Operating life: min switchings with max. contact load Function indicators: three LEDs for operation, level alarm and fault Dimensions Dimensions of the Nivotester in Minipac format. Housing width: 2 in. (50 mm). 100 mm = 3.94 in 1 in = 25.4 mm 4.4 in. (113) [4.8 in. (121)] 4.4 in. (111) Mounting See diagram on left. 1 Row mounting on standard rail 1.4 in. x 0.3 in. or 1.4 in. x 0.6 in. (35 mm x 7.5 mm or 35 mm x 15 mm) 2 Minimum spacing between next row of instruments above and below: min. 2 in. (50 mm) when sensor used in explosion-hazardous area, min. 1 in. (25 mm) when used otherwise. Order Code Limit switch Nivotester Certificate, Approval R Standard, no special approval G [EEx ia] IIC (CENELEC) O IS Class I, II, III, Div. I, Groups A, B, C, D, E, F, G (FM) 2 Version 0 Minipac housing 3 Power supply A AC 180 to 253 V, 50/60 Hz B AC 90 to 140 V, 50/60 Hz C AC 38 to 52 V, 50/60 Hz D AC 21 to 27 V, 50/60 Hz E DC 20 to 30 V, in preparation 4 Output 1 Potential-free change-over contact
6 Supplementary Documentation Liquiphant FDL 30, FDL 31, FDL 35, FDL 36, Sensors for limit detection in liquids Technical Information 185F/24/ae United States Canada Mexico Regional Office 2350 Endress Place Greenwood, IN Kenrick, Ste. B-14 Phone: (317) Houston, TX Phone: (281) FAX: (317) FAX: (281) Fogarty Engineering Sterling IPC Sales Company Div. of Div. of Powell Road P.O. Box 901 P.O. Box 604 Harvey, LA Romeo, MI Phone: (504) Phone: (810) FAX: (504) FAX: (810) Canada, Ltd. Canada, Ltd Graham s Lane th Street, #100 Unit 1, Burlington Edmonton, AB T5S 1R5 ON, L7S 1W3 Phone: (403) Phone: (905) FAX: (403) FAX: (905) Canada Ltée 6800 Côte de Liesse, Ste. 100 St. Laurent, Que H4T 2A7 Téléphone: (514) Télécopieur: (514) Calle Camino Sta. Teresa 1384 C.P Mexico D.F. Phone: (525) FAX: (525) TI 203 F/24/ae/10.95 Printed in U.S.A.
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