Series_PR_Orifice_Plate_by-pass_flowmeter
6Pages

Orifice plate flowmeters Series PR By-pass flowmeter for liquids, gases and steam          By-pass flowmeter with orifice plate (compact system PRC and separate system PR) for big flow ranges Flow indication by means of by-pass flowmeter Scales calibrated in l/h, m3/h, kg/h, %, etc. Suitable for vertical and horizontal pipe Minimum straight pipe run required of 10 x DN and 7 x DN before and after the orifice plate Suitable for flow measurement of liquids, gases and steam Flow rate: 2 ... 20000 m3/h water Accuracy: ±4% f.s. Connections: - Orifice plates DN50 ... DN1000 Pressure inlets: ¾” BSP - By-pass flowmeters: - Model 6001/PR: ¾” BSP thread - Model 6002/PR: EN 1092-1 DN20 flange - Model SC250/PR: EN 1092-1 DN15 flange - Model PS31/PR: ¾” BSP thread or solvent weld socket DN20/25E plastic coated steel, EN 1.4404 (AISI 316L), Local indication Options: - 1 or 2 limit switches - Model PR25 / PR31 / PRC31: electronic transmitter with 4-20 mA analog output for safe or hazardous area (Ex ia IIC T4 or T6 protection, ATEX certified). HART protocol available on request - Model PR25: Local volume totalizer. Remote volume totalizer by me

Working principle By means of variable differential pressure according to flow rate, obtained thanks to an orifice plate with constant section. An orifice plate mounted in a pipe where fluid flows causes a differential pressure that changes according to a square function of the flow rate. A small section circuit with a flowmeter is connected to the pressure inlets of the orifice plate. The differential pressure makes the fluid flow by this circuit, so the flowmeter provides a local indication of the main pipe flow rate.  Connections: - Orifice plates DN50 ... DN1000 Pressure inlets: ¾”...

Orifice plate flowmeters Series PR Mounting In the orifice plate flowmeters series PR it is necessary to keep a minimum straight pipe run of 10 x DN before and 7 x DN after the flowmeter. The required distance depends on the flow profile, which can be affected by the disturbing elements found in the installation before and after the flowmeter. Likewise, in the separate orifice plate flowmeters models PR61 / PR62 / PR31 / PR25 mounting must be made by means of a by-pass circuit and isolation valves (not supplied). The length of this circuit must be the minimum possible in order to avoid...

Flow ranges External Ø Flow scales carrier assembly Approximate differential pressure at maximum flow rate (mmH2O) Minimum differential pressure for model PR25: 5000 mmH2O For an accurate calculation of the orifice it is necessary to provide the exact inner pipe diameter * Differential pressure 14000 mmH2O approx. Limit switches and transmitters The PRC models are compact orifice plate flowmeters. The orifice plate and its carrier assembly are mounted together with the by-pass flowmeter. These flowmeters are delivered already assembled in the position required by the end user, according to...

Orifice plate flowmeters Series PR Mounting Flow direction ED: flow from left to right DES: flow from right to left DAB: downwards flow BD: upwards flow Materials Please refer to chart page 3 Flow ranges Please refer to chart page 4

Limit switches Adjustable limit switch PT-AMR Transmitter PT-TMUR Bi-stable SPST reed switch, actuated by a magnet inside the float and mounted in a PVC enclosure. Requires AISI 304 frame. Technical data available at series PT/PS datasheet  PT-AMR1 ... 2: 1 ... 2 adjustable reed switches  Hysteresis: ±5% of full scale value The TH7 electronic transmitters provide an analog output proportional to the flow rate and a digital output selectable either as a pulse or an alarm output (except for the Ex versions). They can also include a display for volume totalization. They are based on the...