Indicating Digital Transmitter for Differential Pressure and Flow. Media 6 with LCD Media 6 with LED
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1 Indicating Digital Transmitter for Differential Pressure and Flow Media 6 with LCD Media 6 with LED Application Microprocessor-controlled transmitter for measuring and indicating the differential pressure or derived measured variables for gases or liquids in cryogenic service Measuring ranges from... 6 to... 6 mbar Nominal pressure PN 4 1) The Media 6 differential pressure meters are measuring and indicating devices for differential pressure and the measured variables derived from it. They are used to measure flow according to the differential pressure method and, above all, to measure the liquid level of pressure vessels. Cryogenic, liquified gases such as Ar, O 2, N 2, CO 2, H 2, He etc. are particularly suitable as process media. When used in combination with an appropriate power supply unit (e.g. Type from SAMSON) for the electric power supply or the Media LOGI-Compact hardware for remote data transmission, the tank content (function of hydrostatic pressure, tank geometry data and liquid density of the stored gas) is converted into a current signal from 4 to 2 ma proportional to the tank content and displayed on a LCD in the selected measuring unit. Additionally, limit values can be monitored and indicated. Remote transmission of all relevant Media 6 data is possible using the Type 527 Media LOGI-Compact hardware and the Type 517 Media LOGI-Base software. The tank data can be transmitted via a phone line and modem to a remote PC, where they are analyzed. When used in combination with an orifice plate assembly (Type 9/Type 91 Orifice Flange), the Media 6 devices can be used for continuous flow measurement of gases, vapors and liquids (differential pressure method). Special features Suitable for liquids, gases and vapors Microprocessor-controlled transmitter with RS-22 interface for configuration and programming on site Two adjustable software limit switches Gas selection by switch Programming via memory pen Digital display (LCD) for temperatures down to 4 C with 1% bar graph as well as alarm and warning markers Zero point and span adjustment activated via key without influencing each other Two-wire connection for standard current signal 4 to 2 ma Easy configuration using Type 6661 TROVIS-VIEW Overloadable on one side up to the permissible static pressure, indicating unit with burst protection Field unit with degree of protection IP 65 1) PN 5 on request 2) Others on request Media 6 with LCD Fig. 1 Media 6, versions Media 6 with LED Valve block directly connected (flange mounting) with operating pressure gauge Versions Media 6 with LCD Transmitter with digital display Two-wire system Output signal 4 to 2 ma, supply voltage 12 to 6 V DC, consisting of: LCD 9 mm with 1% bar graph and blinking alarm and warning markers Two software limit switches according to NAMUR Dp-cell made of CuZn4Pb or stainless steel (on request), PN 4 1) Free of oil and grease for oxygen Measuring ranges from 4 to 6 mbar Measuring diaphragm made of ECO 2) Zero point and span adjustment activated via key Process connections G 8 A RS-22 interface Media 6 with LED Transmitter with light emitting diode (LED) to signal specific operating states Versions as described above Additional to an already existing mechanical indicator and as a supplementary independent measuring device in installations with increased safety standards Media 6 optionally equippable with... Version as above, but for hazardous areas Input circuit with degree of protection II 2 G EEx ia II C T6 Directly connectable valve block (flange mounting) to check the pressure in the tank Remote tank monitoring with Media LOGI-Compact and Media LOGI-Base Associated Information Sheet T 95 EN Edition May 22 Data Sheet T 9527 EN
2 Principle of operation (Fig. 2) The measuring device consists of a dp-cell (1) with a measuring diaphragm (1.1), measuring springs (1.2) designed to correspond to the span, and the indicating unit (7) with an LCD or LED. The differential pressure p = p 1 p 2 causes a shift in the axis (1.5) of the measuring diaphragm (1.1) supported by the measuring springs (1.2). The change in travel, which is proportional to the differential pressure, is led through a lever (1.) and the elastic disk (1.4) out of the pressure chamber to the displacement sensor (2). This sensor converts the travel into an electric signal. The signal of the displacement sensor (2) is compared to the data stored in the EEPROM (4) and processed in the microprocessor (). It controls both the LCD or LED and the D/A converter (9) for the output signal. The output signal, which is proportional to the measured value, is a load-independent direct current signal from 4 to 2 ma available at male connector A. At male connector B, two software limit switches (8) for min. alarm (e.g. minimum filling level) and max. alarm (e.g maximum filling level) are connected to the switching amplifier according to DIN EN The RS-22 interface (1) enables the device to be configured with a special memory pen or directly via a PC with SAMSON s TROVIS-VIEW Configuration and Operator Interface. The userspecific data are saved in the EEPROM (4). This way, a backup copy of the data can be saved until they are overwritten. The operating data of the Media 6 can also be copied and loaded on site. The memory pen can be programmed using a PC and the corresponding SAMSON software TROVIS-VIEW with the operating data - type of gas, gas density, geometrical shape of the tank and location of the min./max limit switches. These details enable the conversion of the differential pressure into values which are proportional to the tank content to display and issue the direct current signal from 4 to 2 ma. Four types of gas as well as the span and write protection function can be set with the DIL switch (6). In combination with three keys (5), several operating functions (zero point and span adjustment, max. alarm limit switch and test function settings, etc.) as well as the operating status (load/save operating values) can be adjusted Indicating unit with LCD dp-cell Valve block with pressure gauge Indicating unit with LED µp Fig. Principle of operation m % 1 p _ 2 p 1 + Ar O 2 N 2 CO 2 EEPROM Span: Start - Value End - Valvue 9 Male connector A UB =12 to 6 V_ IA = 4 to 2 ma 8 Male connector B Max. alarm Min. alarm RS Light emitting diode Plate for gas types and measuring ranges H Fig. 2 Principle of level measurement for liquified gases in cryogenic service H h h Storage tank Ar, N2, O2, CO2, etc. Measuring range Measured level (~tank content) + Media 6 with valve block m % 1 p2 p1 1 dp-cell 1.1 Measuring diaphragm 1.2 Measuring spring 1. Lever 1.4 Elastic disk 1.5 Diaphragm axis 2 Displacement sensor Microprocessor 4 Memory (EEPROM) 5 Keys for operating functions 6 4-pin DIL switch - selection of gas type, span protection and write protection 7 Indicating unit with LCD 8 Limit switch 9 D/A converter 1 RS-22 interface 2 T 9527 EN
3 Table 1 Technical data All pressures stated in bar (gauge) or mbar Differential pressure measuring device Media 6 Measuring range to to to to mbar to 6 to 1 to 16 to 25 to 4 to 6 (Span 1:5 adjustable) Span min. 6 to 6 to 1 to 16 to 25 to 4to 6 to 1 to 16 to mbar Cl. 1.6 max Span min. mbar 1) 4 to 4 to 4 to 6 to 1 to 15 to 25 to 4 to 6 to 1to Cl. 2.5 max Nominal pressure PN 4 2), overloadable on one side up to 4 bar Display LCD 9 mm or LED mm Performance Output and display linear to the tank content Terminal based non-conformity < ±1.6 % or < ±2.5 % (including hysteresis) depending on the selected span Sensitivity <.25 % or <.5 % depending on the selected span Effect of static pressure <. % / 1 bar Influence of ambient temperature in the range from 2 to +7 C on zero point on span < ±.2 %/1 K < ±.2 %/1 K Limit switches 2 software limit switches (e.g. 1x min. alarm, 1x max. alarm) in acc. with NAMUR and DIN EN 5227 Control circuit, adjustable in 1% steps Rating according to the connected the switching amplifier ) in acc. with NAMUR and DIN EN 5227 Hysteresis 1 % related to the maximum tank capacity (MCN) 4) Range of inversion, approx. <.6% Degree of protection acc. to DIN VDE 47 IP 65 Weight without valve block with valve block Approx.. kg Approx. 5. kg Version Two-wire system Output 4 to 2 ma UB 12 V Perm. load RB in Ω R B = 2 ma Output current circuit Intrinsically safe (on request) Supply voltage UB for two-wire transmitter Ambient conditions Perm. ambient temperature range 12 to 6 VDC 4 to +7 C Perm. storage temperature range 4 to +8 C 1) When values fall below these measuring spans, the accuracy class Cl. 2.5 may be exceeded 2) Oxygen version up to PN 5 on request ) e.g. KFA6-SR2-Ex2.W (Co. Pepperl & Fuchs) 4) MCN = Maximum Capacity Nominal Note: All data about errors and deviations stated in % of the adjusted measuring span! 12 to 28 VDC - only in combination with an intrinsically safe circuit - T6; max. +6 C T5; max. +7 C Table 2 Materials Differential pressure measuring device Media 6 Version Standard version Special version dp-cell Cu Zn 4 Pb CrNi steel 1) Measuring diaphragm and seals ECO Measuring springs Diaphragm plates and function parts CrNi steel Lever Indicating unit Polycarbonate 1) On request T 9527 EN
4 Electrical connection In combination with a power supply unit (e.g. SAMSON Type 524) or the Media LOGI-Compact hardware, the tank content can be transmitted and shown with the direct current signal 4 to 2 ma, which is proportional to the tank content. Additionally, the limit switches can be monitored and signalized. Data can be transferred either directly to the control room or, in combination with the Type 527 Media LOGI-Compact hardware and the Type 517 Media LOGI-Base software, to the PC of the gas supplier via phone line and modem. Storage tank Ar, N2, O2, CO2, etc. Tank system Media 6 with valve block % m A B Control room Power supply unit e.g. Type 524 A B Control room Media LOGI- Compact RS - 22 Power supply 2 V~ Phone line Gas supplier Modem + + Switching amplifier acc. to DIN EN 5227 Switching amplifier acc. to DIN EN 5227 PC with software Media LOGI-Base Two-wire system with data transmission into the control room Fig. 4 Data transmission Two-wire system with remote tank monitoring system Type 527 Media LOGI-Compact and Type 517 Media LOGI-Base software Terminal assignment The Media 6 differential pressure meter is designed as a twowire system. Both the measuring signal from 4 to 2 ma and the necessary supply voltage U B = 12 to 6 V DC for the twowire transmitter are transmitted by the same pair of wires. The Media 6 is connected with the device s plug connector in accordance to DIN 465, Style 1, 4-pin. Male connector A Power supply unit ~ Male connector A Two-wire connection for standard current signal 4 to 2 ma Two-wire connection Perm. load R B = U B 12 V 2 ma in Ω The rated supply voltage U B = 24 V DC. Male connector B Switching amplifier The permissible voltage range at the Media 6 device plug is between 12 V and 6 V DC with regard to the supply lead resistance Male connector B Software limit switches Connection for two software limit switches to connect to the switching amplifier in accordance to NAMUR and DIN EN Software limit switches for switching amplifier acc. to DIN EN 5227 Fig. 5 Electrical connection, terminal assignment 4 T 9527 EN
5 Mounting On mounting, it is important to make sure that the Media 6 device is attached to pipes, walls or mounting plates free of vibration, for pipe mounting, use mounting material with clamp to attach it to a vertical or horizontal pipe; use mounting material without clamp for wall mounting, see dimensional diagram in Fig. 6 for panel mounting. We recommend installing a shut-off valve and additionally an equalizing valve in the measuring lines. For this purpose, the SAMSON product range includes a valve block (see T 9555 EN) which is directly connected (flange-mounted) to the Media 6. Wall/panel mounting using two threaded holes M 8 in the rear side of the measuring chamber or two bore holes 8. mm in the valve block. Pipe mounting with mounting material and clamp for attachment to a horizontal or vertical 2 pipe. Process medium connection: Tapped hole ISO 228 G 8. Dimensions in mm Ø11 M % m Control panel 6 Bore pattern for panel mounting 17 Two bore holes 8.5 mm for mounting to the rear side of the dp-cell for screws M Two bore holes 8.5 mm for mounting to the valve block Fig. 6 Dimensional diagram 5 T 9527 EN
6 Accessories (also see T 9555 EN) Valve block PN 4 for non-flammable gases Order no. Brass St. steel Others on request Pressure gauge ND 1, Cl. 1. acc. to DIN EN 87 S1 or S optionally 4/6/16/25/4 bar see T 9555 EN Others on request Screw gland according to customer specifications on request Remote data transmission Media LOGI-Compact Type 527 (hardware) Compact field modem for connection of max. 4 sensors Media LOGI-Base Type 517 (software) see T 951 EN Isolating switch amplifier acc. to DIN EN 5227 for connection to male connector B - also installed in IP 66 enclosure or in SAMSOMATIC alarm system on request - Order no. 2 channels, HE 2 V AC Others on request Power supply and indicator unit Type 524-1, with two floating limit switches Order no. HE 2 V AC HE 115 V AC HE 24 V AC Table Nomenclature for ordering - Complete the order no. according to the instrument version chosen - Order No. Versions Type 56 - Versions Media 6 for measuring contents 1 Protection for use in hazardous areas Without EEx ia IIC T6 1 Version Material Standard Cu Zn 4 Pb 2 Oxygen Cu Zn 4 Pb 2 1 Standard Stainless steel 2 Oxygen Stainless steel Measuring range Diaphragm material 6 mbar 2 1 mbar 16 mbar 4-52 ECO 4 25 mbar 5 4 mbar 6 6 mbar 7 1 mbar 4-7 ECO 2 16 mbar mbar ECO 6 mbar 2 Display and output LCD and output: 4 to 2 ma 1 LED and output: 4 to 2 ma 2 Details are required about the tank characteristic and the gas to be stored (as set out by the specification sheet for parameterization of the Media 6) so that the display proportional to tank content and the two-wire signal of 4 to 2 ma can be set by the manufacturer. Ordering text Indicating Digital Transmitter for Differential Pressure Media 6 Version Type 56 - Special version... Accessories... Specifications subject to change without notice. SAMSON AG MESS- UND REGELTECHNIK Weismüllerstraße 614 Frankfurt am Main Germany Phone Fax Internet: T 9527 EN
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