Technical information

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7500 Series Radar Tank Gauges

Continuous and non-contact precision level measurement for

custody transfer and inventory control applications with NMi and

PTB approvals.

Benefits

• 0.5 mm accuracy (2σ value)

• National approvals (NMi, PTB) for custody transfer.

• Applicable as stand-alone system or tied into tank

gauging systems via the 4590 Tank Side Monitor.

• Easy on-site operation via menu-driven

alphanumeric display.

• Easy commissioning, documentation and

diagnostics via operating software (ToF Tool).

• Application-specific antenna selection. Planar

antenna versions allow direct installation on tapered

stilling wells.

• Cost-effective and simple installation via 4-wire

cable with HART and 24 V DC intrinsically safe power

supply.

• Gas-tight process connection (second line of

defense) standard for any antenna version.

• Inventory control version with reduced accuracy (3

mm) available for all instrument types.

Application

The 7500 Series Radar Tank Gauges are used for highly

accurate level measurement in storage tanks and can be

applied in custody transfer applications. It meets the

relevant requirements according to OIML R85 and API

3.1B.

Tank

Side

Monitor

System

Communications

AC Power

2-wire i.s. HART

Pressure

Temperature

Radar

2-wire i.s.

DC Power

Summary of content (20 pages)

PAGE 1
7500 Series Radar Tank Gauges Continuous and non-contact precision level measurement for custody transfer and inventory control applications with NMi and PTB approvals. Benefits Application • 0.5 mm accuracy (2σ value) The 7500 Series Radar Tank Gauges are used for highly accurate level measurement in storage tanks and can be applied in custody transfer applications. It meets the relevant requirements according to OIML R85 and API 3.1B. • National approvals (NMi, PTB) for custody transfer.
PAGE 2
7500 RTG Function and System Design Measuring Principle The Radar Tank Gauge is a "downward-looking" measuring system, operating based on the time-offlight method. It measures the distance from the reference point (process connection) to the product surface. Radar impulses are emitted by an antenna, reflected off the product surface and received again by the radar system. Antenna Selection It is essential for each and every application and installation to evaluate the right antenna type.
PAGE 3
Radar Tank Gauge point due to the hydrostatic tank deformation can be compensated in the Tank Side Monitor. A Tank Side Monitor can provide 24 VDC for a 7500 Series Radar Tank Gauge. The Tank Side Monitor can communicate with up to 6 devices via HART Multidrop. Reference Operating Conditions According to OIML R85: • Temperature = -25 °C... +55 °C (-13…+131 °F) • Atmospheric pressure • Relative humidity (air) = 65 % ±15% • Medium properties: e.g. medium with good reflectivity and calm surface.
PAGE 4
7500 RTG Installation Guidelines Configuration The Radar Tank Gauge is commissioned by entering an empty distance E (=zero) and a full distance F (=span) that correspond with 4mA and 20mA current output. A linearization table (max. 32 points) which can be configured locally or remotely provides engineering units and a linear output signal for spheres, horizontal cylindrical tanks and vessels with conical outlet.
PAGE 5
Radar Tank Gauge Measuring range depending on vessel type, conditions, and product for Micropilot S Media group Stilling well/ Bypass Free space (Storage tank) Measuring range 7532 RTG ≥ DN150 7533 RTG 7530 RTG DN150/200/250 7531 RTG 38 m/124 ft — — — 38 m/124 ft 40 m/131 ft DN150: 10 m/33 ft DN200/250: 15/49 ft m 10 m/33 ft ε 38 m/124 ft 40 m/131 ft DN150: 15 m/49 ft DN200/250: 20 m/65 ft 15 m/49 ft ε 38 m/124 ft 40 m/131 ft DN150: 20 m/65 ft DN200/250: 25 m/82 ft 20 m/65 ft NMi:
PAGE 6
7500 RTG Measuring Conditions propagate completely outside the tube. It must be taken into account that the accuracy may be reduced in the area C. In order to guarantee the required accuracy in these cases, it is recommended to position the zero-point at a distance C above the tank bottom. • The measuring range begins where the beam hits the tank bottom. Particularly with dish bottoms or conical outlets the level cannot be detected below this point.
PAGE 7
Radar Tank Gauge Note! The behaviour in case of the measuring range being exceeded can be freely set: the default setting is a current of 22 mA and the generation of a digital warning (E681). • Stilling well: a stilling well can always be used to avoid interference. The 7532 RTG with planar antenna is recommended for stilling wells with a diameter DN150 (6”) and larger. • Metallic screens (3) mounted at a slope spread the radar signals and can, therefore, reduce interference echoes.
PAGE 8
7500 RTG • Do not weld through the pipe wall. The inside of the stilling well must remain smooth. In case of unintentional welding through the pipe, the weld seam and any unevenness on the inside need to be carefully removed and smoothed. Otherwise, strong interference echoes will be generated and material build-up will be promoted.
PAGE 9
Radar Tank Gauge Inputs and Outputs Terminal Assignment Overvoltage Protector The 4-wire cable is connected to the screw terminals (wire diameter 0.5…2.5 mm) in the terminal compartment. Use 4-wire twisted pair cable with screen for the connection. Protective circuitry against reverse polarity, RFI, and over-voltage peaks is built into the device.
PAGE 10
7500 RTG Operation Operation Concept The display of the process value and the configuration of the Radar Tank Gauge occur locally by means of a large 4-line alphanumeric display with plain text information. The guided menu system with integrated help texts ensures a quick and safe commissioning. Display and operation can occur in one out of six languages (English, German, French, Italian, Dutch, and Spanish). During the first start-up, the instrument explicitly asks for the desired unit / language.
PAGE 11
Radar Tank Gauge Signal on Alarm Error information can be accessed via the following interfaces: • Local display: –Error symbol –Plain text display –LED’s: red LED continuously on = alarm, red LED flashes = warning • Current output • Digital interface Linearization The linearization function of the 7500 Series Radar Tank Gauge allows the conversion of the measured value into any unit of length or volume. Linearization tables for calculating the volume in cylindrical tanks are pre-programmed.
PAGE 12
7500 RTG Maintenance Spare Parts and Maintenance Kits The 7500 series RTG is designed and manufactured to provide accurate and reliable operation without an intensive maintenance schedule. Varec can provide spare parts, preventive maintenance advice, training and warranties. Please consult your Installation and maintenance manual or a representative for more details. Cleaning the Antenna The antenna can get contaminated, depending on the application.
PAGE 13
Radar Tank Gauge Accessories Antenna Extension for 7530 RTG UNI Flange The antenna extension has to be selected such that the horn extends below the nozzle. Varec UNI flanges are designed for non-pressurized operation. Typical pressure fluctuations of breather valves can be tolerated. The number of bolts has sometimes been reduced. The bolt-holes have been enlarged for adaption of dimensions, therefore, the flange needs to be properly aligned to the counterflange before the bolts are tightened.
PAGE 14
7500 RTG Sample Hatch for 7532 RTG Weather Protection Cover For control and cleaning purposes for sample taking as well as for hand dipping (tape), a sample hatch is recommended. The sensor head of 7532 RTG (planar antenna!) can be easily checked in the area of the opening. Manual gauging with gauge rod or tape is possible without removal of the transmitter. The lower edge of the opening is the reference for the gauging.
PAGE 15
Radar Tank Gauge Roof Reflector Measurements on floating roofs are not recommended for highly accurate measurements due to the unsteady movements of the floating roofs. A special reflector can be used for applications on floating roofs (not for 7532 RTG with planar antenna!). FMR 530 Optimum mounting position • Positioning of the reflector on a floating roof: • The upper edges of the reflector have to be aligned horizontally. • For slanted locations (e.g.
PAGE 16
7500 RTG Technical Specifications The following specifications apply to the 7500 Series Radar Tank Gauge 7530, 753, 7532 and 7533 RTG over the normal (ambient) operating temperature rangethat can be calibrated for inventory control and custody transfer applications according to regulatory standards in compliance with OIML R85. Environmental T Ambient temperature -40 °F and +185 °F (-40 °C and +85 °C) For calibration to regulatory standards: -25 °C ...
PAGE 17
Radar Tank Gauge Performance Wetted Parts Hysteresis 0.3 mm (1/64") Absolute accuracy better than ±1 mmFree space 7500 Series Radar Tank Gauge radar gauges typically provide accuracy of ±0.5 mm (2 sigma value). The 7500 Series Radar Tank Gauge 7532 RTG stilling well radar gauges typically provide accuracy of ± 0.8 mm (2 sigma value).
PAGE 18
7500 RTG Product Dimmensions 7531 RTG rod antenna T12 Housing Flange DN 50...150 or equivalent 76 (3") 65 (2.56") b 94 (3.7") 76 (3") T12 housing 68 (2.68") 2”/3” Tri-clamp ISO 2852 85 (3.35") 100 / 250 (3.94"/7.87") 100 / 250 (3.94"/7.87") 161 (6.34") Ø 129 (5.08") ØD for non-conducting media 1) antenna extension PTFE, antistatic 86 (3.39") L L1 86 (3.39") DI N ANSI JIS 394 / 544 (15.51"/21.42") 7530 RTG horn antenna Ø 33 (1.3") 390 / 540 (15.35"/21.26") Ø 33 (1.
PAGE 19
Radar Tank Gauge detail A: flange adapter (see under) 93 (3.66") E+H UNI flange (max. 1 bar) DIN, ANSI, JIS 8 (0.31") 7532 RTG planar antenna Antenna version ( ∅D) DN150 / 6" DN200 / DN250 / DN300 / 8" 10" 12" L [mm (inch)] 93 (3.66") 337 (13.27") 490 (19.29") 517 (20.35") D [mm (inch)] no horn 192 (7.56") 242 (9.53") 292 (11.5") L Note! The inactive length of 60 mm prevents condensation effects to the antenna performance.
PAGE 20
7500 Radar Tank Gauge www.varec.com Your Official Representative Corporate Headquarters 5834 Peachtree Corners East Norcross, GA 30092 Tel: +1 (770) 447-9202 Toll Free: +1 (866) 698-2732 Fax: +1 (770) 662-8939 If no offical representative is listed here, please visit www.varec.com to find your local representative. © 2006 Varec, Inc. An SAIC Company. All Rights Reserved. This document is for information purposes only. Varec, Inc. makes no warranties, express or implied, in this summary.