KFF/KFG Low-Volume Flow Meter User Instructions
Contents
1. KFF KFG Low Volume Flow Meter User Instructions KFG_KFF_manual_0304 OBOLD O KFF KFG 1 General Information Please read this service manual carefully before unpacking and readying the unit for operation and follow the instructions precisely as described herein These devices may only be installed used and maintained by skilled personnel who are familiar with this service manual and can observe applicable regulations regarding industrial safety and accident prevention 2 Contents 2 OWOANOOA WD General Information 0 00 cece eee ence eee ee eeee Page SSONIENIS 7 dubs amchauievwsa a eae aa Page suggested Application lt c1e ea ea Page Operating Ptineiple nr Jenaer Page Unit Check up ee ran dene Page Mechanical Connection 0 0 cece eee eee ees Page Electrical Connection ccc cece eee eee ees Page Electrical Commissioning 00e0e eee eee e ees Page Mechanical Commissioning 0 20eeeeee eens Page gt Te hnical Data ns 2 ana Page s DIMENSIONS screen Page Manufactured and Marketed by Page 2 Kobold Instruments Inc 1801 Parkway View Drive Pittsburgh PA 15205 Tel 412 788 2830 Fax 412 788 4890 ON OO AFR BR WWD PP 03 04 03 04 KFF KFG 3 Suggested Application The KFF and KFG series flow meters are used for measuring small liquid or gas flows These units are configured as follows Analog output2. In order to transmit the measured flow results an analog output 0 5 V is provided A 500 Hz max pulse output is available on some models Flow sensor with analog output Integrated sensor with LCD digital display 3 digit The KFF meters may only be used for measurement of low viscosity clear fluids lt 10 cSt Measurement of liquids with higher viscosity can result in significant measurement errors The KFG meters are calibrated at standard conditions in air 14 7 PSIG 68 F Notes for KFG 1 series Non conventional media pressures or temperatures may require a user calibration on site by means of a comparison unit or volumetric test Attention The media to be measured must not be contaminated In particular large particles can cause jamming or destruction of the rotor 4 Operating Principle KOBOLD flow meter KFG and KFF are being used to measure small and very small flow volumes The medium to be measured can be in gaseous form KFG or in liquid form KFF These units function according to Pelton principle meaning that the flowing medium will set a paddle wheel in rotation The rotary movement is translated into pulses via photo cells An electronic integrator uses these pulses to generate a flow proportional analog output signal 0 5 V Page 3 KFF KFG 5 Unit Check up These devices are checked before shipment and sent away in perfect condition Should the damage to a device be visible we recommend
3. ensured that the sensor is completely filled with flow media Note Large air bubbles in the measurement chamber can cause error indications and may destroy the bearings and impeller 10 Technical Data Accuracy Linearity Repeatability Mounting Position Temperature Range Maximum Pressure Analog Output Supply Voltage Power Consumption Wetted Materials All Units 3 F S 3 F S KFF 0 2 F S KFG 1 F S Horizontal 32 120 F KFF Ryton 100 PSI Brass 500 PSI PTFE 60 PSIG KFG 40 PSIG 0 5 VDC 12 5 VDC 2 VDC regulated 35 mA typical See Current Datasheet Page 7 KFF KFG 11 Dimensions KFF KFG 1 1 8 KFF KFG 1 1 4 KFF KFG 1 3 8 1 2 Page 8 03 04 KFF KFG 12 Cautionary Information PLEASE READ THE FOLLOWING GENERAL FLOW METER MONITOR WARNINGS BEFORE ATTEMPTING INSTALLATION OF YOUR NEW DEVICE FAILURE TO HEED THE FOLLOWING INFORMATION MAY RESULT IN EQUIPMENT FAILURE AND POSSIBLE SUBSEQUENT PERSONAL INJURY e Inspect the instrument for damage upon arrival Cracked fractured or otherwise damaged instruments must not be put into use since the device is weakened to an unknown extent e Under NO circumstances must the maximum tolerances of flow pressure temperature or supply voltage be exceeded e The maximum tolerances of the device have been determined using water air and or oil If using other media especially corrosive media it is
4. a thorough inspection of the delivery packing In case of damage please inform your parcel service forwarding agent immediately since they are responsible for damages occuring during transit Scope of delivery Standard scope of delivery applies Flow meter Connection cable with plug KF 7000 Instruction manual 6 Mechanical Connection Before Installation Please ensure that the actual flow volume is in agreement with the measuring range of the device The reference number of measuring range can be read from the item number label Note Continuously exceeding the measuring range can cause damage to bearings Make sure that the maximum operational pressure and temperature are not exceeded Ensure that there is no remaining packing material inside the unit KFG The calibration of the unit is performed in horizontal position the item label faces upwards With other mounting positions a measured value deviation of 0 25 C at 50 nominal flow should be taken into consideration KFF KFG Page 4 Mount the measuring device on desired position Two mounting flanges are supplied for this purpose Connect unit to your piping system Do not remove the meter fittings as the calibration may change Attention When tightening fittings it is necessary to work with two suitable wrenches A transfer of torque on device s housing while tightening the fittings can result in the destruction of the measuring device Check the seal
5. critically important that the user determine chemical compatibility with our instruments KOBOLD Instruments Inc cannot accept responsibility for failure and consequences resulting from the use of media other than water air mineral oil or nitrogen e The sudden cessation of fluid flow causes what is typically called water hammer Water hammer is a transient force caused by the transfer of momentum of a flowing fluid to the piping system when the flow of fluid is suddenly stopped i e pump trip or valve closure e Water hammer can cause fluid pressure surges which could cause the flow measuring device s pressure limit to be exceeded resulting in equipment failure and possible personal injury These pressure surges can be particularly harmful if the flow instrument is empty since there would be no backpressure in the device To avoid these pressure surges the fluid lines should remain full and flow should be introduced and isolated from the system slowly Freezing of fluid in the instrument must be avoided since the resultant expansion will damage the flowmeter and make it unsafe for use 03 04 Page 9
6. ing of all connections 03 04 KFF KFG 7 Electrical Connections Attention Ensure that the voltage level of your supply system corresponds with the voltage level required by the measuring device 12 5 VDC 2 VDC Make sure that the electrical supply lines are not active Connect the ends of supplied connection cable KF 7000 with your system according to the wiring diagram shown below The green wire is used only if the unit has an optional pulse output Attention An incorrect connection can lead to damage of the unit electronics Connect the cable plug with the corresponding socket to the measuring device The plug and socket are indexed so that an incorrect connection is impossible KF 7000 Connection Cable Wiring 1 Black V Power Signal gnd 2 White 0 5VDC Output 3 Red V Power in 03 04 Page 5 KFF KFG 8 Electrical Commissioning KFF KFG The unit is supplied ready for operation The electronics are adjusted and calibrated to the sensor By turning the potentiometer located on the side of the electronics the analog output 0 5 V can be adjusted by using a reference meter if necessary Page 6 03 04 KFF KFG 9 Mechanical Commissioning To avoid pressure spikes flow medium should enter the unit slowly Attention Pressure spikes generated by water hammer or caused by magnetic valves ball valves or similar devices can lead to destruction of the unit During operation it must be
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