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FLOW Product Data Sheet Platon Vampire - Electronic Indicator PLATON TYPE GMTX OPERATING PRINCIPLE The GMTX electronic indicator with microprocessor enhanced performance and LCD panel display of flow rate and total, designed for use with a metal tube variable area flowmeter for liquid, gas or steam measurement. The VAMPIRE is a metal tube variable area flowmeter; as the flow up through the precision machined tapered tube increases, the float rises, reaching an equilibrium position. Electron beam welded within the float casing is a magnet. Two “Hall effect” magnetic field sensors measure both the vertical and horizontal components on this field. The angle of the magnetic field defines the position of the float in the tapered tube. This solid state measurement eliminates the problems of mechanical hysteresis associated with conventional magnetic pointers. Field angle is also independent of the absolute value of magnet strength, and sensor sensitivity. Suitable for use with body options, the VAMPIRE (Variable Area Micro Processor Indicator Readout Electronics) has a totally solid state measurement system, eliminating mechanical hysteresis errors. Microprocessor interpolation between flow data points, stored in factory calibrated look-up tables, gives an improvement to ±1% accuracy for this technique. The loop powered 4-20mA transmitter is certified intrinsically safe to CENELEC standards, for use in a potentially hazardous area. Both loop powered and AC mains powered units have separate high and low flow alarm outputs. 4-20mA transmitter Intrinsically safe approval Liquid or gas flow calibration Built-in flow totaliser Operator adjustable high and low alarms 1% accuracy VA meter reliability Program setting password protection

The measurements are compared with a look-up table of field and flow data, stored in the VAMPIRE micro processor memory on factory flow rig calibration. Flow rate is deduced accurately by interpolation between data points. The micro processor converts the flow rate to correct engineering units for the digital display on the LCD, adjusts the display meter pointer and 4-20mA output, sets the alarm status and increments the totaliser as necessary. Keypads on the VAMPIRE front panel are used to set flow alarm levels, zero the totaliser and select the digital display as rate or total. Via a...

METAL TUBE FLOWMETER FAMILY VAMPIRE flow measurement electronics can be supplied with any of the Platon metal tube variable area flowmeters in the GMT family (see leaflet DS1221 Screwed and DS1220 Flanged). Ensure that no ferromagnetic material is situated within 100mm of the indicator. Model GMTXA has output relays de-energised for alarm conditions. Model GMTXD transistor outputs are “off” for alarm conditions. The negative line is common to the transistor outputs and the loop supply. Intrinsically safe installations of Model GMTXD should be in accordance with BS EN60079-14. The 4-20mA...