Plant Equipment and Spare Parts

Water Meters

PROTEM offers a range of propeller type water meters. The PWM II is a great solution in any industrial application where preset water quantities or rate of flow are required and have to be remotely displayed.

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Particularly for concrete batching plants, our water meters are a very cost-effective solution compared to the installation of a scale since they provide the measuring accuracy required by the regulation. Available dimensions from 2 "to 4" with selectable electrical pulse output per 1, 2, 5 or 10 lt.

PROTEM’s water meters are WOLTMAN type with horizontal impeller, flanged, dry type, with an electronic pulse transmitter but without a reading counter. The transmission of the movement from the impeller to the pulse transmitter is done by a magnetic coupling. The impeller as well the pulse transmitting mechanism can be easily replaced without the need to remove the body of the meter from the pipelines. They are capable of smooth operation at ambient temperatures from 0° C to 60° C and a maximum water temperature of 40° C.

ADVANTAGES

The PWM II water meter series feature:

Microprocessor based pulse transmitter with fuzzy logic error detection. This solves the most common problems that other water meter in the market are facing:

a) False pulses due to the hydraulic shock, reverse water flow or vibrations in the water pipelines.

b) High resolution (1lt/pulse) even on large flow rates.

c) Led indication of output pulses and permitted flow rate exceeded.

Magnetic coupling between impeller and electronic metering head. This means that no sensitive part of the meter comes in contact with the water, except its impeller.
Easy access to the impeller without the need to disconnect the meter body from the pipelines. Consequently, the maintenance of the water meter and the cleaning by foreign objects that can block the impeller becomes very fast.

AVAILABLE MODELS - TECHNICAL SPECIFICATIONS

Nominal Diameter of PWM II	mm	50	65	80	100
in	2’’	2 ½ ’’	3’’	4’’
Flow specifications
Nominal flow rate according to ISO 4064	m3/h	15	25	40	60
Maximum flow rate Qmax	m3/h	70	100	150	250
Maximum working flow rate	m3/h	35	50	90	125
Flow division limit Qt	m3/h	2	5	6	6
Minimum flow rate Qmin	m3/h	0.7	0.75	0.8	1.2
Flow rate at pressure drop 0.1 bar	m3/h	38	65	75	100
Accuracy within Qmax - Qt	%	± 2%	± 3%
Accuracy within Qt - Qmin	%	± 5%

Dimensions and weights
Length of embodiment	mm	200	200	225	250
Total height	mm	220	230	240	255
Exterior flange diameter	mm	165	185	200	220
Weight	Kg	11	12	15	17
Standard flange drilling according to DIN 2532 and BS 4504

Electrical output specifications
Rated supply voltage	8-24 VDC
Output signal	Transistor out NPN, 70mA max.
Protection	Overload, short-circuit
Resolution (Lt/pulse)	1, 2, 5, 10 (selectable)

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