VSE - Débitmètres à engrenages Série VHM
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VSE - Débitmètres à engrenages Série VHM - 1

Solutions for Fluid Technology FlowMeasurement Technology VHM series Paints, Dyes Chemicals Pharmaceuticals Two-component mixers Petrochemicals

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VHM gear flow meter Were developed for high precision flow metering for a wide variety of liquids, especially liquids with high abrasiveness and poor lubricity. Are positive displacement units based on the meshing gear principle. Each tooth generates an impulse by recognition of the gear rotation by a non-contact detection system according to the carrier frequency principle. Applications include: chemical, petrochemical, pharmaceutical and cosmetic industry, two-component mixers, paints, aviation. Are available with single, double or quadruple resolution, signal-output with NPN or PNP...

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VHM-Flow Response Curves VHM 01-1 29.01

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Flow Meter-Dimensions Flow Meter-Dimensions Type Special designs on request

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Side ports Side port connection Side ports Plug connection Signal pick-up Flow Meter Side Ports Side Port Connection

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Type Codes Flow Meter VHM + Subplates AHM Backlash (worksdetermined) Reduced tolerance Short term explanation to type of seals: FEP Increased tolerance 303 V2A (upon request) 316 V4A (Standard) Subplate Piping (upon request) (upon request) NBR = pure Acryl-Nitrile Butadiene Rubber O-Ring PTFE = pure PolytetraflourEthylene Rubber O-Ring Affilated VHM flow meter size Housing material: stainless steel Connection orientation (upon request) Type of connection (other types on request) G pipe threads NPT pipe threads Design Series Side connection Bottom connection A C F H VHM mounting from Only...

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Type Codes - Signal pick-up Cable entry K Cable gland S Plug connector with VSE standard plug Design Connection Supply with lithium battery for fibre optic output 4-wire connection with U/I limiting 2-wire connection without U/I limiting Input: light impulses Output: electronic digital impulses Signal pick-up Single-channel pick-up with modified carrier frequency Single-channel pick-up with normal carrier frequency Converter (fibre optic receiver and converter) Plug connector Two-channel pick-up (impulses x 1) Two-channel pick-up* (impulses x 2 / impulses x 4) * For series VDB... (fibre...

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Selection criteria - signal pick-ups Double pick-ups series VD.../VE... in flow velocity measurement and volume measurement with high signal resolution A. 2 impulses/measured volume or 4 impulses/measured volume optionally coded by jumpers in the pick-up B. 1 impulse/measured volume in modified series VE... NPN or PNP switching optocoupler output Single pick-ups series VI.../VT... in flow velocity measurement and volume measurement 1 impulse/measured volume General applications Measured volume signal resolution per conveyed tooth gap volum Galvanic isolation between the supply voltage and...

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Single pick-ups and double pick-ups in Ex-design The single pick-up operates with a carrier frequency oscillator which is modulated when a tooth passes. The double pick-up operates with two independent carrier frequency oscillators which are modulated when a tooth passes. This modulation is detected by the amplifier and is used to generate a pulsing current signal in the supply current. The connected barrier amplifier detects the signal and generates a digital PNP signal for further processing. The output impulses per measured volume correspond to those of the two standard designs. + 1...

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Signal pick-ups for VHM flow meters

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Signal pick-ups for VHM flow meters Technical Data Part 2 Signal output voltage U DC Single pick-ups in standard design Double pick-ups in standard design Deviations from Ex design Deviations from Ex design 7-30 V (depending on the supply voltage and loading of the optocoupler) 7-30 V (depending on the supply voltage and loading of the optocoupler) Ex design To VSE barrier amplifier: 7,5-27,5 V; depending on the supply voltage Ex design VSE barrier amplifier: output circuit <100 mA Signal switching frequency f Signal output circuit To VSE barrier amplifier: 7,5-27,5 V; depending on the...

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Signal pick-ups with optical fibre technology for VHM flow meters Technical Data Part 3 Double pick-ups with fibre Fibre optic receiver VUM... Signal pick-ups per flow meter body Detection of the direction of flow Body data Volume impulse/fault signal – Signal voltage UDC: 9-30 V (depending on the supply voltage and loading of the signal output circuit) Signal current IDC: max. 10 mA (for supply voltages > 16 V DC) Ø 78 mm; height 62 mm; overall height with sensor 72 mm Overall length with optical fibre and plug connector = 98 mm; L = 64 mm; B = 58 mm; H = 37 mm Mounting construction: 2...

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Signal pick-ups with optical fibre technology for VHM flow meters Technical Data Part 4 Switching frequency f: Volume impulses/ fault signals – signal output circuit Fibre optic receiver VUM... Double pick-ups with fibre optic output VDB... 3 Hz-1,0 KHz Fibre optic output diode: Digital optical signals to the fibre optic receiver (volume sensor signals; monitor signals in stand-by; battery status signals) 3 Hz-1,0 KHz One transistor each with series resistor R = 1,2 k Ohms VHM type list optical fibre technology VHM Double pick-up with fibre optic output *Size 03 on request Accessories for...

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The barrier amplifier has an intrinsically safe control circuit and is equipped with galvanic isolation between the control and output circuits to the supply. It contains a pulse-switching, short-circuit-resistant transistor output and is con- Single pick-up with plug connection Double pick-up with plug connection nected with screw terminals. The amplifier is installed in a plastic housing and is fitted with a snap-in mounting for attachment to an installation rail. The barrier amplifier must be installed outside the Ex area in an electrical cabinet or terminal box. The intrinsically safe...

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General principle of functioning The two gearwheels of the instrument are set into motion by the volume flow passing through the flow meter. Each tooth of the gearwheel is scanned by a single or double signal pick-up, which is screwed to the flow meter. When the gearwheel rotates, this signal pick-up generates an electrical output impulse when a tooth of the wheel passes the scanning range. Each conveyed tooth gap volume corresponds to one electrical output impulse for a single signal pick-up, or 2 or 4 electrical output impulses for a double signal pick-up, depending on the jumper coding....

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