Rotameters (Variable Area Flow Meters)

Rotameters or Variable Area Flow Meters for technically clean fluids are available in a number of different models, involving different tube lengths and connection sizes. Details of these provided below. Standard unit has transparent PVC tube, PVDF non-magnetised float (target), UPVC union ends with solvent weld end connectors to BS/Ansi dimensions.
Note 1: Flow scale is in LITRES PER HOUR and is calibrated using the viscosity and density of water at 20°C.
Note 2: PVC is not recommended for gaseous media
Note 3: DFM 165 = tube length 165mm

DFM 165 3/8” (DN10) Flow range 3-24, 5-60, 10-100, 25-250 (LPH)
DFM 170 1/2” (DN15) Flow range 5-50, 15-150, 25-250, 40-400 (LPH)
DFM 185 3/4” (DN20) Range 15-150, 50-400, 60-600, 100-1,000 (LPH)
DFM 200 1” (DN25) Range 25-250, 40-400, 100-1,000, 150-1,500 (LPH)
DFM 350 1” (DN25) Flow range 15-150, 30-300, 60-600, 100-1,000 (LPH)
DFM 350 1-¼” (DN32) Flow range 150-1,500, 250-2,500 (LPH)
DFM 350 1-½” (DN40) Flow range 200-2,000, 300-3,000 (LPH)
DFM 350 2” (DN50) Flow range 400-4,000, 600-6,000, 1,000-10,000 (LPH)
DFM 350 2½” (DN65) 1,500-15,000, 2,500-25,000, 10,000-50,000 (LPH)

Options: Different scales (eg LPS, GPM, M³/H), BSP end connectors, alternative tube materials for different media PA, PSU or PVDF, alternative float material 1.4301 (V2A), union ends in PP, PVDF or white malleable cast iron, union O-rings in FPM

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Rotameters with Limit Reed Switches & Sensors

All of the above DFM165-350 Rotameters can be supplied with a variety of position indicators, limit reed switches and flow data sensors. As the position of the float needs to be sensed, the standard PVDF float needs to be changed to one with an encapsulated magnet. Some of these accessories are:-

Limit Reed Switch model ZE951 (ID 48119) Bi-stable switch or switches can easily be fitted to the dovetail guide (rail) molded into the flow tube. Max operating voltage 230v AC. Can be used to indicate minimum, maximum or intermediate flow values. A signal occurs when the magnetic float has reached or exceeded the limit switch position.

Flow Data Sensor ZE 2000 - Easily mounted on the dovetail of the flow tube, it measures the present position of the float. Voltage 24vDC, measuring accuracy 1% of measured value, direct analogue output, 6-channel contact plus connection to various measuring instruments or controllers, programmable. Operating conditions (media, concentration, viscosity, density etc) must be provided when placing the order as they are required when making the scales.

Flow Data Sensor ZE 3000- Micro-processor controlled sensor guarantees accurate measurement and can be used to signal the flow at various point and to process the values in a PLC and display the actual values. Uses 2-wire technology, 8..28VDC input & 4-20mA output, 11 point calibration, measuring accuracy better than 0.5%. The particular DFM to which the ZE 3000 is to be fitted, must be advised before purchase.

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