Coriolis Mass Flow Meter CMM

Transcription

1 Coriolis Mass Flow Meter CMM

2 Construction Function The Coriolis Mass Flow meter CMM contains oscilating measuring tubes which make use of the Coriolis force effect. The mass flow entering through the inlet of the flow meter is distributed by the flow-distributor to the measuring tubes bended parallely and symmetrically. The measured medium after flowing through the measuring tubes is collected in the meter body and is leaving the meter through the outlet. Due to an electromagnetic oscillating coil the symmetrical constructed pair of measuring tube is oscillating continuously and symmetrically at its momentary resonance frequency. Two sensor coils are fixed at the pipes symmetrically, sensing the symmetry of the oscillation. In flowless condition the electric signal of the two coils are sine wave signals identical in amplitude and in phase. In case a mass flow is started through the pipes, the symmetry of the oscillation is disturbed. Due to this sine wave signal of the sensor at one side is shifted in phase from the sine sine wave of the sensor at the other side. The value of the phase shift is directly proportional to the mass flow. With the signal processing unit C-Mass the signals of CMM are received and processed. As output signals frequency, current output or serial interface are available. The sensor can be operated in hazardous areas. In this case a special zener barrier unit has to be inserted between the electronic unit and the mass flow sensor. The protection mode of the measuring system is: II (2) G [Ex ib] IIB [05 ATEX 034) 2 KRACHT GmbH Gewerbestr Werdohl, Germany fon +49(0)23 92/935-0 fax +49(0)23 92/ web mail info@kracht.eu

3 Technical Data General Characteristics Ambient temperature C + 70 C (-- 58 F +158 F) Medium temperaturer C C (-- 58 F +302 F) with remote electronic unit C + 80 C (-- 58 F +176 F) with compact electronic unit C (-- 4 F ) according to Ex classification Material Stainless steel (316L) Degree of protection IP 65 Electrical Characteristics Output signals Operating voltage Frequency (max. 10 khz) Current (max. 20 ma) Serial interface (RS 232 or RS 485/422 with MODBUS RTU printout) VDC (max. 150 ma) Ambient temperature C + 70 C (-- 58 F +158 F) Degree of protection IP 65 Flow rate Type CMM CMM CMM CMM CMM CMM CMM CMM CMM Max. flow rate [kg/min] Accuracy The maximum error of the measurement calculated as follows: h = ± 0.2 ± 5/q (%) by: q = Q / Q max x 100 (%) h maximal error of measurement related to the measured value (%) q flow rate (%) Q mass flow to be measurement (kg/h) Q max maximal mass flow (kg/h) The maximum final value error is ± 0.05 % KRACHT GmbH Gewerbestr Werdohl, Germany fon +49(0)23 92/935-0 fax +49(0)23 92/ web mail info@kracht.eu 3

4 Type Key Ordering example CMM 0.15 N S F 016 J N Pressure N normal H high Material S stainless steel X special EX protection N no Z with Zener barrier unit Electrical connection J junction box C compact electronic Pressure rating bar bar bar bar bar bar bar bar bar Connection type F flanged R NPT E ERMETO Product code Nominal size max. flow rate (t/h) KRACHT GmbH Gewerbestr Werdohl, Germany fon +49(0)23 92/935-0 fax +49(0)23 92/ web mail info@kracht.eu

5 Dimensions CMM N CMM 3 80 N CMM N X Y Z P Q W Max. pressure mm threaded flanged bar NPT 1 2 DN NPT 1 2 DN NPT 1 2 DN NPT 3 4 DN NPT 1 DN NPT DN DN80 40 CMM H CMM H X Y Z P Q W Max. pressure mm ERMETO flanged bar M 16 x M 20 x M 20 x M 27 x 2, DN DN KRACHT GmbH Gewerbestr Werdohl, Germany fon +49(0)23 92/935-0 fax +49(0)23 92/ web mail info@kracht.eu 5

6 Product Portfolio Transfer Pumps Transfer pumps for lubricating oil supply equipment, low pressure filling and feed systems, dosing and mixing systems. Mobile Hydraulics Single and multistage high pressure gear pumps, hydraulic motors and valves for construction machinery, vehicle-mounted machines. Flow Measurement Gear and turbine flow meters and electronics for volume and flow metering technology in hydraulics, processing and laquering technology. Industrial Hydraulics / Test Bench Construction Cetop directional control and proportional valves, hydraulic cylinders, pressure, quantity and stop valves for pipe and slab construction, hydraulic accessories for industrial hydraulics (mobile and stationary use). Technology Test benches / Fluid Test benches. CMM/GB/06.07 KRACHT GmbH Gewerbestraße Werdohl, Germany fon +49 (0) / fax +49 (0) / mail info@kracht.eu web