The SF-586b Insertion Flow Meter For Compressed Air, Gases And Exhaust Air (up to 400 C) In Pipe Diameters From 25mm to 5000mm P in mw v in m/s page 1 of 12
The SF-586b Insertion Thermal Mass Flow Meter, General Information The thermal mass flow meter SF-586b was developed by the German company Softflow.de GmbH and produced here in Germany for now more than 2 years. The Flow Meter preferred by Industrial, Environmental and Commercial customers for a variety of applications. With the new SF-586b thermal mass flow meter, based on the old version type SF-586a (sold for more then 10 years), Softflow.de has developed a new measuring system which enclosed the old and proven technology together with a very new and high performance digital microprocessor technology. The basic Softflow.de technology is the utilizing of a separate analogue controller for the over temperature controlling instead a traditional drift prone Wheatstone Bridge. While doing a further development up to the new SF-586b we retained consistently the well-tried analogue controller for over temperature, but additional now a microprocessor is controlling and, if necessary, adjusting automatically the results from the analogue controller. The advantages of the analogue controller: high resolution, very fast. The advantages of the digital controller: long time stable, very high absolute accuracy. Summarized both functions together guarantee a very long time stable electronic evaluation for calorimetric probes with excellent electrical characteristics. For service and support display menus available which give information about the important probe characteristics (reference temperature, heater temperature, power consumption of the heater and over temperature. For testing the electronic without sensor a simulator is available. Optionally many interfaces possible, also firmware update/upgrade is possible. Thermal Mass Flow Meter, The General Benefits Direct mass flow. No temperature or pressure transmitters are necessary. Usable in high temperature ranges up to 400 C. High Accuracy and Repeatability. Precision measurement and excellent repeatability. Wide ratio measuring range 1:100. Softflow.de calibration from 0,6Nm/s to 60Nm/s. Not meaningful pressure drop, nearly no influence to the flow. No moving parts. Long time accuracy and long life time. Dirt Insensitive but if needed, simple cleaning. Easy installation and convenient mounting. page 2 of 12
The SF-586b Calorimetric Measurement Principle The calorimetric measurement based on the physically principle of heat transfer from a heated element to the ambient medium, for e.g. air. This is effected by the velocity, by the density (temperature and pressure) and by the characteristic of the medium. The amount of needed energy is a function of the temperature difference t and the mass flow. The thermal mass flow meter SF-586b is using the following method. The temperature difference (over temperature) t between the reference sensor (medium temperature) and the heater sensor is controlled electrical constant by an analogue controller** (CTA= Constant Temperature Anemometer). This controller together with a high power operational amplifier enables a very fast and absolute precise adjustment of the needed power for keeping the over temperature constant. This controller was also installed in the old SF-586a. The controller is working with a very high accuracy and also very fast, but from time to time a recalibration of the electronic was necessary. The reason: also very high quality analogue components are changing over the time the electrical characteristics The SF-586b are using also the traditional analogue controller, but additional a digital 12-Bit controller is controlling the over temperature also. A microprocessor controls and corrects the over temperature nearly without any influence of analogue drifting. This controller is working ratiometric and therefore the electronic evaluation has an excellent long time stability. ** Softflow.de GmbH do not utilize a traditional Wheatstone Bridge. All the disadvantages of a Wheatstone Bridge, means electrical drifting, no lead length compensation, difficult adjustment and many more are not existing in the SF-586b. page 3 of 12
The SF-586b Spezial Features LC-dot matrix display, 4 lines a 16 characters, digital contrast adjustment, temperature compensated, illuminated High accuracy and high long time stability by microprocessor adjusted flow sensor with compensation of thermal conductivity over the complete temperature range Microprocessor signal processing and evaluation 0/4-20/24mA or 0-5/10V analogue output Relay output (changeover contact) as impulse or switch point configurable Interface RS232 for data and configuration Keyboard interface for configuration Stable, plugged spring-cage connection for easy connection and installation Four-wire technique for probe connection (both sensors), complete compensation of measuring errors and high interference immunity even when using long probe connecting cable (up to 100m) No active electronic components in the probe, thereby useable in high temperature applications Power supply 115-230VAC, 12VDC (9-18VDC), 24VDC (18-36VDC) SF-586b firmware update/upgrade possible Optional: 3 x analogue input 0-5V/12Bit, readable via RS-232 interface opto-coupler impulse-output Modbus, ProfiBus, Ethernet, M-Bus Additional analogue output 0/4-20/24mA or 0-5/10V Internal data logger with SD-card und real time clock Probe for temperature ranges up to 420 C Probe HALAR-ECTFE coated, for aggressive mediums Probe with junction box Probe with head protection page 4 of 12
The SF-586b Insertion Thermal Mass Flow Meter The evaluation unit is supplied with an illuminated LC-dot matrix display, with 4 lines/16 characters, for volume and mass flow and also for the totalizers. For applications in large diameters an automatically format switching enables the display to show the correct data for volume and mass flow and also for the totalizer. The flow is additional indicated by a horizontal bar graph. Format is 0-100% related to the maximum flow. Shown in the display also the temperature of the medium, the power consumption and the over temperature of the heater element (flow sensor). Standard over temperature setting of Softflow.de probes are 20 C or 40 C. The power consumption (in mw) of the flow sensor at velocity zero comparing with the factory settings allows the detection of a dirty sensor. The flow proportional analogue output is free configurable (0 5/10V oder 0/4 20/24mA). Selectable ranges: volume flow, mass flow, velocity or temperature The Relay output (changeover contact) is configurable as impulse or switch point. Selectable ranges for impulse: totalizer for volume or for mass Selectable ranges for switch point: volume flow, mass flow, velocity or temperature All configurations and adjustments, also reading out data and settings are possible via RS232 interface. With a special adapter firmware upgrades are possible. Before shipment the unit can be configured according to customer's specifications These Factory settings are: Display volume and volume flow or mass and mass flow Output end value, impulse value, switching point / hysteresis, baud rate, address, mean value, off-set and low flow suppression All these configurations can changed and also restored by customer. page 5 of 12
For the power supply the following options available : 12VDC(9-18VDC) 24VDC(18-36VDC) 115-230VAC Each SF-586b is calibrated by Softflow.de in his own wind channel, range 0,6Nm/s up to 60Nm/s. The data of this calibration curve are normalized for: Conductivity 0 C Temperature 0 C Pressure 1,01325bar At the end a second test in the wind channel for controlling and writing the protocol and certificate. For housing of electronic evaluation and probe the protection class is IP65. The connecting of the probe (both sensor elements) in four-wire technique enables a complete compensation of measurement errors and therewith a high precision measurement independent of any influence by cable length or cable characteristic is possible. The evaluation signal input for both sensor elements are supplied with very high precision instrumentation amplifiers. This, together with a modern microprocessor, gives a very high accuracy and an excellent long time stability. The internal mathematic Spline interpolation between the 60 points of the curve gives additional a very high resolution in the measurement results, specially in the low flow ranges. The insertion thermal mass flow meter SF-586b consist of an insertion probe, made of stainless steel (1.4571 = 316SS) and a separate (remote) microprocessor signal evaluation (electronic converter) in a plastic housing. Protection class for both IP65. page 6 of 12
The SF-586b System Overview LC-Display illuminated Electronic type SF-586b Analogue I/U output Relay changeover contact Probe Keyboard interface Firmware upgrade/update RS232 interface 12/24 VDC-S *1 *2 Small housing *1 dimension 150x150x57mm with 1x Pg7 und 2x Pg9 9-18 Volt DC 18-36 Volt DC 115-230 Volt AC 24 VDC-L Large housing *2 dimension 200x150x79mm with 5x Pg9 3x Analogue input 0-5 Volt 2. Analogue I/U output Modbus, ProfiBus, Ethernet, M-Bus page 7 of 12
The SF-586b Flow Meter Data Sheet Design Insertion probe with separate electronic converter (remote control) Function Principle Calorimetric, primary signal mass flow proportional Probe With 2 x Pt100 sensor elements, in 1.4571 stainless steel sheath Diameter=12mm, length 120/250mm (Standard), maximal up to1500mm Diameter=25mm, length up to 1500mm Medium Air, dry, different gases are possible Measuring Range 0,6-60m/s (1:100) at norm conditions 0 C / 1,013bara** Stored Calibration Curve 60 points, firmware internal Spline interpolation Flow Accuracy +/ -2% from reading value >= 5m/s > +/ -0,1m/s Flow Repeatability +/ -0,5% from reading value Response Time (T90) < 1,5sec Warming Up Time 5min after switching on Operating Gas Pressure maximal 16bara (higher pressure on request) Operating Temperature -40 C to +100 C (standard), 0 C to +200 C / 300 C / 400 C / 420 C Ambient Temperature -20 C to +60 C Installation Position unrestricted Steadying Distance 30 x pipe diameter upstream, 10 x pipe diameter downstream. The minimum steadying distance depends upon the application Longer steadying distances have to be considered, if double elbows or partly closed valves have been installed in front of the unit Process Connection Welding socket with G1/2 female thread Remote Electronic Converter Microprocessor based, complete and automatically compensation of temperature conditioned signal drifting. Digital conductivity compensated adjustment of heater over temperature. Power Supply 12VDC(9-18VDC), 24VDC(18-36VDC) or 115-230VAC Power Consumption < 5Watt Protection Class IP65 Signal Input 1xPt100 heater, four-wire technique, 1xPt100 reference, four-wire technique Signal Output 0-5/10VDC or 0/4 20/24mA flow proportional, relay output changeover contact configurable as impulse or switch point, RS232 bi directional for configuration und data Optional: opto-coupler impulse output, Modbus, ProfiBus, Ethernet, M-Bus, additional second analogue output 0/4-20/24mA or 0-5/10V Display LC dot-matrix-display, 4 lines, 16 characters, illuminated, digital contrast adjustment, temperature compensated Display Indication Values Mass flow and totalizer, volume flow and totalizer, velocity, temperature, heater temperature with power consumption, temperature difference Test & Support Electronic function test with pluggable probe-test-simulator. Probe controlling via display, heater temperature, heater power consumption, over temperature Data Logger (optional) Internal data logger with SD-card and real time clock (RTC) Dimensions Please look at: drawing of probe and electronic housing CE Approvals Low tension instruction 73/23/EEC / EMC-Standard 89/336/EEC Connecting Cable Length 5m (standard), optional 10m, Electronic Converter To Probe different lengths are possible Electrical Connections Plugged spring-cage connection for all inputs and outputs (max.1,0mm²) ** Example for maximal volume range with different inner pipe diameter 15-25 32 40 50 65 80 100 200 300 3.000 mm 100 170 260 410 700 1.000 1.700 6.800 15.200 1.500.000 Nm³/h page 8 of 12
The SF-586b Standard Probe 120mm and 250mm Scale 1:2 page 9 of 12
The SF-586b Large Electronic Housing 200x150x79mm Scale 1:2 page 10 of 12
The SF-586b Small Electronic Housing 150x150x57mm Scale 1:2 page 11 of 12
The SF-586b Converter Electronic Board 1 2 3 4 8 7 9 5 6 1. 10 pin plugged spring-cage connector for all inputs and outputs 2. 9 pin SUB-D connector for the keyboard 3. Connector for the display 4. Programming connector for firmware update/upgrade 5. Power operational amplifier for the flow sensor (heater) 6. 10 pin plugged spring-cage connector for the probe (reference and heater) 7. Low loss ballast and high efficient switched power supply 8. Gold cap for a microprocessor controlled shutdown while switching power off 9. Microprocessor Manufactured By Authorised Distributor Germany. page 12 of 12