B T H Grabowski
tel/fax+ 48 (024) 262 36 63
mobil +48 (0) 601 699 460
email: info@bthgrabowski.pl

Untitled Document
| Function + Advantage | | Types | | Accessories | | Vendor |


Advantages overview
Reasonable measuring devices
Independent of electricity
Exact measuring even with low flow
Low system costs
Easy condition checking and maintenance
No potential leaky spots
High mechanical dependability
Low pressure lost
Suitable even for low pressure
For processes under challenging or rough conditions, too

Operational area
cooling water measuring device
potable water preparation
filter control installations
heat engineering
housing technology
hydraulic balancing of heating and cooling installations in medical technology
plastering machines
swimming pool technology

The mechanical flow meter can be described with the following measuring methods:

Area flow meter for measurement of liquids and gases Area flow meter are economical advantageous and well proven solutions for various liquids, gases and steam applications with lower flow rates. We offer from simple and inexpensive display devices (no additional energy needed) up to solutions with high technology communication (HART®, PROFIBUS). The Variable Area Flow Meter is an instrument for measuring the flow rate of liquids and gases in pipelines. It includes a vertical, upward expanding metering tube through which the fluid to be metered flows from the bottom to the top, and in which a movable float is located. This float rises as the flow rate increases in such a manner that the hydraulic forces are always balanced by the opposing force due to the float weight, which is always constant regardless of the flow rate. The height of the float is a measure of the flow rate. The flow rate value can be read from a scale.

Baffle plate flow meter designed for the measurement of liquids and gases

The sensor of this measurement instrument consists of a baffle plate with balance beam and operates according to the design deflection method. The baffle plate causes a back-pressure in the medium and the balance beam is deflected. This movement is transmitted via the beam to the indicator mechanism using a bellows bushing. A gear unit converts the deflection of the balance beam into a rotary movement of the pointer. The pointer movement is damped by an eddy- current brake. The bellows bushing isolates the measured medium from the display unit.

Differential pressure principle designed for the measurement of liquids
Orifice flow meter primarily consists of an orifice plate as the sensor and a float as the display element. A differential pressure is produced across the orifice plate which is fitted in the main stream between two flanges in the piping. In a bypass this differential pressure produces a volume flow in a rotameter. The height of the float indicates the flow rate. The flow is read at the position of the float`s widest diameter.

Flap-type flow meters designed for the measurement of liquids and gases
The fitting contains a measuring flap which can be rotated around an axis. At rest (i.e. no flow), the flap closes the pipeline by its own weight. As soon as there is a flow, the flap is lifted depending on the flow velocity. The respective flow quantity can be read directly in transparent liquids from the position of the flap. The bottom edge of the flap is the reference edge. In turbid or opaque liquids, the movement of the flap is transmitted by a magnet mounted on the flap to an external mechanical pointer, and the flow is displayed on a scale. The scale and pointer are protected against external effects and contamination by a Plexiglass or glass pane. The scale has the standard dimension m3/h, and can be calculated for an application-specific medium and operating pressure/temperature if the density differs from 1 kg/l (62,43 lbs/cu.ft). Special scales are available at extra charge. An inductive contact is triggered by a contact lug mounted on the pointer.