Screw-Type Flow Meter SVC

Transcription

1 Screw-Type Flow Meter SVC

2 Description Screw-type flow meters belong to the group of positive displacement flow meters. Two measuring spindles (pos. 2) with a screw-shaped profile engage with each other. They are low-friction mounted using roller contact bearings (pos. 3) and enclosed by a housing (pos. 1). The liquid flow causes the spindles to rotate and passes through the device in an axial direction. In so doing, self-contained part volumes are formed which are continuously filled and emptied. This principle of measurement causes no pressure and/or flow pulsations. A sensing wheel attached to the measuring spindle (pos. 4) is scanned by two non-contact sensors. Using two sensors, a bidirectional flow with detection of flow-direction is possible. The inflow and outflow occurs almost without deflection. Consequently, the device exhibits a relatively low drop in pressure. Measuring this way does not require the flow to be calmed at the inlet and outlet. All moving parts are lubricated by the measurement medium. Construction Product Characteristics 1 Housing 2 Measuring system (screw spindles) 3 Bearing (roller contact bearing) 4 Sensing wheel and sensors Very low pressure drop High-response measurement Measurement with changing flow direction pulsation free measurement principle High working pressure Very low noise emission Measurement independent of viscosity within the specified ranges High-precision measurement with outstanding reproducibility 5 Seal (O-ring) 6 Connection 7 Measuring connection (pressure, temperature etc.) Temperature-independent output signals over a wide temperature range High degree of accuracy, even with low flow rates at the bottom end of the measuring range High working reliability of the electronics Easy to use terminal of the preamplifier Working indication of the electronic Sensor system and preamplifier in EMC-compatible design Explosion-proof version available (ATEX) 2 KRACHT CORP. 86 S Wilkinson Way Unit A Perrysburg, OH USA P F flowmeters@krachtcorp.com

3 Accuracy Characteristics The accuracy figures quoted by KRACHT refer to the impulse volume [cm 3 /Imp], that is to say the percentage deviation applies to the current value in each case. The linearity error over the entire measuring range is ±.1 %. Reproducibility of a measured value is <.1%. Accuracy checking forms part of quality inspection in every case. On request the result of the test will be documented in the form of an accuracy characteristic curve; an example relating to a SVC 1 A1 is given below. The accuracy values quoted by Kracht are confirmed by the DKD (German Calibration Service). Accuracy Volume per pulse (cm 3 ) % --.2 % 1.43 / 25/6.6 5/ /19.8 / /33. 15/39.6 Flow rate (l/min - gal/min) Linearity Volume per pulse (cm 3 ) % --.1 % 1.43 / 25/6.6 5/ /19.8 / /33. 15/39.6 Flow rate (l/min - gal/min) KRACHT CORP. 86 S Wilkinson Way Unit A Perrysburg, OH USA P F flowmeters@krachtcorp.com 3

4 Materials Housing and flanges Measuring spindles Roller contact bearing O-ring EN-GJS-4-15 (GGG-4) Heat-treated steel Heat-treated steel FKM, EPDM, FEP (other sealing materials on request) Characteristics Mounting position optional Flow direction optional Connection type Pipe thread, SAE-flange, DIN-flange Working pressure SVC 4 p max = 4 bar/582 psi SVC 1, SVC 4 p max = 25 bar/3626 psi (p max =4 bar/58 psi at sealing material L) SVC p max = 14 bar/231 psi SVC 25 p max = 4 bar/ 58 psi Max. pressure drop (short-time) (permanent) p max = 25 bar/363 psi p max = 7 bar/12 psi (at 5 % of the max. flow rate) SVC ( -version) p max = 1 bar/145 psi Viscosity 1 1,, cst (depending on the flow) Sound power level SVC 1 L WA = 46 db (A) SVC 4 L WA = 52 db (A) (at % of the max. flow rate) Permitted Temperature Ranges Sealing Materials FKM EPDM FEP FKM low temperature Ambient temperature - 15 C 8 C / 5 F F - 3 C 8 C / -22 F F - 3 C 8 C / -22 F F - 4 C 8 C / -4 F F Media temperatures: Standard version -15 C 12 C / 5 F F -3 C 12 C / -22 F F -3 C 12 C / -22 F F -4 C 12 C / -4 F F High temperature version -15 C 15 C / 5 F F n. a. -3 C 15 C / -22 F F -4 C 15 C / -4 F F High temperature PLUS version n. a. n. a. -3 C 22 C / -22 F F n. a. -version - 15 C 8 C / 5 F F - 3 C 8 C / -22 F F - 3 C 8 C / -22 F F n. a. Working Characteristics Nominal Impulse Resolution Resolution Pulse Accuracy Starting point Measuring size volume (K-factor) (K-factor) rate (from measuring value) Mounting position range 4-fold* at Q nenn at 2 cst horizontal vertical cm 3 /lmp lmp/l lmp/l Hz % l/min - gal/min l/min - gal/min l/min - gal/min ± ± ± ± ( -version) ± Note: The ATEX characteristics SVC 1 and SVC 4 correspond to the standard characteristics. * Resolution with 4-fold evaluation of both measuring canals 4 KRACHT CORP. 86 S Wilkinson Way Unit A Perrysburg, OH USA P F flowmeters@krachtcorp.com

5 Type Key Ordering example SVC 1 A 1 G1 F 1 S 1 Connection 1 Hirschmann connector Product name Nominal size 4 Q = max. flow rate 6 l/min - 16 gal/min 1 Q = max. flow rate 15 l/min - 4 gal/min 4 Q = max. flow rate 6 l/min gal/min Q = max. flow rate 15 l/min gal/min 25 Q = max. flow rate 375 l/min gal/min Electronics S standard temperature H high temperature E standard temperature, one channel F high temperature, one channel V without preamplifier X protection-design K high temperature PLUS Design code number (specified by Kracht) Seal F FKM E EPDM P FEP L FKM low temperature (only sizes 1 and 4) Connection type G1 Pipe thread F1 SAE-flange (SAE Code 61) D. DIN-flange (DIN EN 192) Spindle bearing 1 Roller contact bearing 2 Roller contact bearing with FKM-sealing (only size 1) Series A Standard sensor (nominal sizes 1 to 25) B High-resolution sensor (nominal size 4) KRACHT CORP. 86 S Wilkinson Way Unit A Perrysburg, OH USA P F flowmeters@krachtcorp.com 5

6 Electrical Connection Electronic: S and H (two channels) Electronic: E and F (one channel) 24 Volt (brown) 24 Volt (brown) Signal output channel 1 Channel 1 (green) Signal output channel 1 Channel 1 (green) Signal output channel 2 Channel 2 (yellow) Volt (white) Volt (white) Electrical Characteristics Number of measuring channels Operating voltage Pulse amplitude Pulse shape with symm. output signal Signal output 2 (1 at one channel version) U op = VDC polarized U A.8 U B square wave pulse duty factor/ channel 1:1 ± 15 % PNP (NPN on request) Pulse offset between two channels* 9 ± 3 Power requirement P b max =.9 W Output power/channel P a max =.3 W short-circuit-proof Degree of protection IP 65 DIN 45 Signal Characteristics Channel I A rising edge B one pulse (corr. to flow rate of geom. tooth volume V gz) C falling edge D ON phase E OFF phase F pulse duty factor 1 : 1 ± 15 % Channel II * G channel offset H flow direction 1 K reversal of flow direction J flow direction 2 * only at two channel version 6 KRACHT CORP. 86 S Wilkinson Way Unit A Perrysburg, OH USA P F flowmeters@krachtcorp.com

7 Explosion-Proof Design (ATEX) Function All screw-type flow meters are available in explosionproof design according to ATEX. The explosion-proof design consists of the screw-type flow meter (intrinsically safe electrical apparatus) and the switching amplifier K 13 (associated electrical apparatus). The type of protection intrinsic safety applies to this construction. The screw-type flow meter is installed in the potentially explosive atmosphere. The mounting of the amplifier K 13 is carried out in the safe area. Screw-type flow meter and switching amplifier are electrically connected to each other. The switching amplifier evaluates the sensor signals and converts them to square-wave signals. Without switching amplifier, the screw-type flow meter must not be operated in the potentially explosive atmosphere. Cable lengths of up to 4 m / 1312 ft are possible between screw-type flow meter and switching amplifier. LED s for monitoring line breaks / short circuits, channel switching state and power supply are located on the switching amplifier. Safe area Potentially explosive atmosphere brown white Channel 1 Channel 2 K 13 shield brown white SVC Volt 24 Volt 7, 8 and 9 jumpered green yellow PA green yellow II (2) G [EEx ia] IIC PTB 3 ATEX 294 X II 2 GD EEx ia IICT4 PTB 3 ATEX 2249 Note: This graph is an example only. National laws for potentially explosive areas must be considered. Technical Data of Switching Amplifier K-13 / 3-E-1 Power supply Supply voltage cl. 7 (L+), cl. 1 (L--) DC 24 Volt ± 2 % Ripple content white Wss < 1 % Outputs (non-intrinsically safe) Characteristics cl. 9, 12, 8, 11 Electronics outputs Short-circuit current Signal level 1-signal Signal level -signal electrically isolated via optoelectronic coupler approx. 25 ma.8 x supply voltage with RL > 2 k ohm inhibited output, residual current < 1 ua Ambience conditions Minimum limiting temperature 248 K ( -25 C / - 13 F) Maximum limiting temperature 333 K (+6 C / +14 F) Mechanics Dimensions 17.5 x 92 x 22 mm / 4.23 x 3.62 x.87 inch Connection possibility can be snapped on a 35 mm / 1.38 inch mounting channel DIN Weight approx. 15 g /.33 lb KRACHT CORP. 86 S Wilkinson Way Unit A Perrysburg, OH USA P F flowmeters@krachtcorp.com 7

8 Pressure Drop Parameter: Viscosity (cst) SVC 4 B1 18/261 16/232 14/23 12/174 1/145 8/116 Extract see right /4. 3/7.9 45/11.9 6/ SVC 4 B1 ( extract) 8/116 7/12 5/73 3/44 1/ /1. 8/2.1 12/3.2 16/4.2 2/ SVC 1 A1 18/261 16/232 14/23 12/ /145 8/116 Extract 5 see right /7.9 6/15.9 9/ / /39.6 SVC 1 A1 ( extract) 8/116 7/12 5/73 2 3/ / /2.6 2/5.3 3/7.9 4/1.6 5/13.2 SVC 4 A1 18/261 16/232 14/23 12/174 1/145 8/116 Extract see right /39.6 3/ / / /116 7/12 5/73 3/44 1/15 SVC 4 A1 ( extract) /1.6 8/ / /42.3 2/ KRACHT CORP. 86 S Wilkinson Way Unit A Perrysburg, OH USA P F flowmeters@krachtcorp.com

9 Pressure Drop Parameter: Viscosity (cst) SVC A1 18/261 16/232 14/23 12/174 1/145 8/116 3/79.3 6/ / / / Extract see right SVC A1 ( extract) 8/116 7/12 5/73 3/44 1/15 2 /26.4 2/52.8 3/79.3 4/15.7 5/ SVC 25 A1 1/145 9/131 8/116 7/12 5/73 3/44 1/ Extract see right 5 5/132.1 / / / /66.4 SVC 25 A1 ( extract) 7/12 5/73 3/ / /66. 5/ /198.1 / /33.2 KRACHT CORP. 86 S Wilkinson Way Unit A Perrysburg, OH USA P F flowmeters@krachtcorp.com 9

10 Dimensions SVC 4 (in mm / in inch) Connection Pipe thread (SVC 4 B1 G1) Connection SAE-flange (Code 61) (SVC 4 B1 F1) Weight Nominal size A B D L K H G P X kg / lb 4 B1 G1 85/ / /3.4* G ¾ 3/ /1.4 4 B1 F1 47.6/ /.9 85/ / /3.4* SAE ¾ * plus 3 mm /.12 inch for electronic type H M1 22 3/ /1.4 1 KRACHT CORP. 86 S Wilkinson Way Unit A Perrysburg, OH USA P F flowmeters@krachtcorp.com

11 Dimensions SVC 1 (in mm / in inch) Connection Pipe thread (SVC 1 A1 G1) Connection SAE-flange (Code 61) (SVC 1 A1 F1) Connection DIN-flange KRACHT CORP. 86 S Wilkinson Way Unit A Perrysburg, OH USA P F flowmeters@krachtcorp.com 11

12 Dimensions SVC 1 (in mm / in inch) Weight Nominal size A B D L K H G P T X kg / lb 1 A1 G1 99/ / /4.* G1 19/.75 33/ / A1 F1 52.4/ /1.3 99/ / /4.* SAE1 1 A1 D1 14/ /1.43 / /6.57* 32/ A1 D2 14/ /1.43 / /6.57* 25/.98 1 A1 D3 15/ / / /6.77* 25/.98 * plus 3 mm /.12 inch for electronic type H M1 17 M16 25 M16 25 M2 3 32/ / / / / / / /42.2 Available DIN-flanges type SVC 1 Diameter Nominal DN (mm / inch) Pressure Nominal PN (bar / psi) D1 32/1.26 4/58 D2 25/.98 16/2321 D3 25/.98 25/ KRACHT CORP. 86 S Wilkinson Way Unit A Perrysburg, OH USA P F flowmeters@krachtcorp.com

13 Dimensions SVC 4 (in mm / in inch) Connection Pipe thread (SVC 4 A1 G1) Connection SAE-flange (Code 61) (SVC 4 A1 F1) Connection DIN-flange KRACHT CORP. 86 S Wilkinson Way Unit A Perrysburg, OH USA P F flowmeters@krachtcorp.com 13

14 Dimensions SVC 4 (in mm / in inch) Weight Nominal size A B D L K H G P T X kg / lb 4 A1 G1 121/ / /4.9* G /.9 26/1. 18./ A1 F1 69.9/ / / /4.9* SAE A1 D1 15/ / / /7.2* 4/1.6 4 A1 D2 17/ / / /7.6* 4/1.6 * plus 11 mm /.4 inch for electronic type H M12 27 M16 2 M / / / / / /6.6 Available DIN-flanges type SVC 4 Diameter Nominal DN (mm / inch) Pressure Nominal PN (bar / psi) D1 4/1.8 4/58 D2 4/1.8 16/ KRACHT CORP. 86 S Wilkinson Way Unit A Perrysburg, OH USA P F flowmeters@krachtcorp.com

15 Dimensions SVC (in mm / in inch) Connection Pipe thread (SVC A1 G1) Connection SAE-flange (SVC A1 F1) Connection DIN-flange KRACHT CORP. 86 S Wilkinson Way Unit A Perrysburg, OH USA P F flowmeters@krachtcorp.com 15

16 Dimensions SVC (in mm / in inch) Weight Nominal size A B D L K H G P T X kg / lb A1 G1 158/ / /6.3* G3 32/1.3 3/ /86.2 A1 F1 16.4/ / /6.2 7/ /6.3* SAE3 A1 D1 2/ / / /8.9* 8/3.1 * plus 11 mm /.4 inch for electronic type H Available DIN-flanges type SVC M16 32 M / / / /11.9 Diameter Nominal DN (mm / inch) Pressure Nominal PN (bar / psi) D1 8 / / 58 Dimensions SVC 25 (in mm - in inch) Connection SAE-flange (SVC 25 A1 F1) 7 / 2.8 Weight Nominal size A B D L K H G P T X kg 25 A1 F1 13.2/ /3.1 2/7.9 44/ /8.* SAE4 * plus 11 mm /.4 inch for electronic type H M /1.5 76/ KRACHT CORP. 86 S Wilkinson Way Unit A Perrysburg, OH USA P F flowmeters@krachtcorp.com

17 Product Portfolio Gear Pumps Gear 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, turbine and screw type 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. SVC / US/ 1.16 KRACHT CORP. 86 S Wilkinson Way Unit A Perrysburg, OH USA P F flowmeters@krachtcorp.com