analytical bulk flow distance FLOW level pressure temperature industrial communication

Transcription

1 analytical bulk flow distance FLOW level pressure temperature industrial communication

2 Miniature Metal - Tube VA Meter General Features Suitable for liquids and gases Suitable for installation in which flow direction is from bottom to top Tapered metering section of rugged all-metal construction Standard Features - MMT18 With horizontal connections A needle valve at the inlet or bottom front of connection block isolv MMT18 and MMT19 are known as Miniature Metal Tube Variable Area flowmeters. These flowmeters are of all-metal construction which consist of metal measuring cone, stainless steel connection blocks and a die-cast zinc housing. Option Can be supplied without valve, or with outlet needle valve at the top connection block (OutLet) A maximum of two adjustable limit switches (L1, L2). The set limits are indicated on the scale. Addition of a differential pressure regulator Standard Features - MMT19 With vertical connections Without needle valve Option A maximum of two adjustable limit switches (L1, L2). The set limits are indicated on the scale. 2

3 Specifications Full-scale range (100% values): Water at 20 C (68 F): Air at bar abs., 20 C (14.7 psia, 68 F): 3 to 100 l/h (0.013 to 0.44 US GPM) 50 to 3400 l/h (0.031 to 2.11 SCFM) Turn-down ratio 10:1 Accuracy class (to VDI/VDE Code 3513, Sh. 2): 4 E a = AC ( ) F E a=error (% actual) F=% Full scale flow AC=Accuracy Class Scale graduation: Max. allowable operating pressure: at 20 C (68 F). 130 bar (1885 psig) flow units Test pressure is 1.3 times the specified operating pressure. Information on higher pressure levels supplied on request Max. process temperature: Without limit switch option 80 C to +150 C ( 112 F to +302 F) With limit switch option Ta<40 C (<104 F) Ta<50 C (<122 F) Ta<60 C (<140 F) (Ambient temperature Ta) 145 C 293 F 135 C 275 F 125 C 257 F Connections: Standard 1 /4 NPT female thread Adapters Ermeto 6 or 8, Serto 6 or 8, Others upon request Materials: Connection blocks, valve, plug Housing Cone, float Gaskets CrNi steel (316Ti) die-cast zinc CrNi steel (316 Ti) PTFE, other upon request Limit switch: Type SJ2-SN Number, max. 2 Electrical connection Right-angle plug, style to DIN 43650/ISO 4400, with PG 11 cable gland Max. signal cable length 1.5 m (5 ft) non-detachable Protection category to EN 60529/IEC 529 IP 65, equivalent to NEMA 12 and 13 An isolation switching amplifier is required to operate the SJ2-SN 3

4 Flow table Reference conditions Water at 20 C (68 F) Air at 20 C, bar abs. (68 F, 14.7 psia) 100% Flow values, Turn-down ratio 10 : 1 Cone No. Valve spindle diameter Water Air max. pressure loss mm l/h l/h mbar psig K K K K K K K K K Dimensions and weights in mm ( inches) MMT19 MMT18 Weight: 0.6kg (1.3 Ibs) Weight: 0.7kg (1.5 Ibs) 4

5 Differential pressure regulators Differential pressure regulators are used to help maintain constant flow rates at fluctuating operating pressure. Minimum pressure levels are required to permit operation of the regulators (see regulator characteristics) Differential pressure regulators are not pressure reducing valves Max. flow rate: 4000 I/h air or 160 I/h water. Pressure levels: CrNi steel (316 Ti) up to max. 25 bar [option 64 bar] Brass up to max. 16 bar (232 psig) Temperatures up to max. 80 C (176 F) [option 100 C] Application ranges Inlet pressure regulators, S-type The S-type regulator help maintain a constant flowrate for gases and liquids at variable inlet pressure and constant outlet pressure. Outlet pressure regulators, T-type For gaseous products, the T-type regulators help maintain a constant flowrate at variable outlet pressure and constant inlet pressure. For liquids, the S-type inlet pressure regulators can also be used to help maintain a constant flowrate at variable outlet pressure and constant inlet pressure. In order to function, the outlet pressure regulator requires a specific minimum pressure difference between inlet and outlet pressures. Inlet pressure P 1 must always be greater than outlet pressure P. 2 Type Identification Material Max. measuring range Min. inlet Min. differential Water** Air** pressure P 1 pressure* l/h l/h P 1 in bar p in bar Inlet pressure stainless steel regulators S-type stainless steel brass stainless steel brass stainless steel Outlet pressure brass regulators stainless steel T-type brass stainless steel brass * Differential pressure between inlet and outlet pressures ** Reference conditions: 20 C (68 F), bar abs. (14.7 psia). 5

6 Regulator Characteristics Inlet pressure regulators, S-type Outlet pressure regulators, T-type l/h 4000 l/h q v 2000 q v p - inlet pressure in bar (psig) 1 p - inlet pressure in bar (psig) 2 Example: inlet pressure 5 bar Air at 20ºC, bar abs., (68ºF, 14.7 psia) q = flowrate v Example: inlet pressure 3 bar Air at 20ºC, bar abs., (68ºF, 14.7 psia) q = flowrate v Dimensions in mm (inches) (use dimensions for installation) S-type T-type Weight approx.1.5 (3.31 Ibs.) Weight approx.1.5 (3.31 Ibs.) 6

7 Limit switch SJ2-SN for MMT18 and MMT19 The SJ2-SN limit switch is a slot sensor with built-in preamplifier. The sensor is activated by the dipping action of an aluminium vane that is mounted on the pointer shaft of the flowmeter. The limit switches can be set over the full measuring range. The set limits are indicated on the scale. An isolation switching amplifier is required for operation of one limit switch. Technical data SJ2-SN Rated voltage 8 VDC Power consumption active area clear >3 ma active area obscured <1 ma Protection category EN 60529/lEC 529 IP 67 (NEMA 6) Ambient temperature 25 C to +65 C Electromagnetic compatibility (EMC) to EN , EN Electrical characteristics to DIN EN (NAMUR) Only relevant for use in hazardous areas Only for connection to intrinsically safe circuits with the following peak values: No-load voltage U O 8 VDC Short-circuit voltage I k 8 ma Self-inductance (Li) 3 μh Self-capacitance (Ci) 230nF Individual approval PTB-No. Ex-95.D.2195X 7

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