The range of instruments we make to meet the special requirements of customers includes stainless steel metering tubes, and Bypass Rotameters for measuring relatively large flow rates. We use our own Indian Patent for the process of making the tapered glass metering tube in a novel way. We craft each and every instrument.

BRAND

The products bears the brand CM, which is a leading name in industrial flow meters in India.

PECIFICATIONS

Specifications are as per customers' requirements. The following information is required to be provided for obtaining a quotation:-

a) RANGE OF FLOW (maximum, minimum, and working).

b) NATURE OF FLUID (liquid or gas). If it is not a very common material like water and air, its chemical and physical properties, as well as corrosion characteristics are needed, to enable us to select the right material of construction.

c) Temperature, pressure, density and viscosity under working conditions.

d) END CONNECTIONS, such as size of flanges, screwed ends or nipple, direction of entry and exit of the fluid etc. If possible, a simple sketch should be provided.

e) Any special requirements, such as necessity of protective guard, preference of gasket material, float material etc., as well as limitation of length in your existing pipe line, if any.

Currently, for the industrial flow meters, the specifications range from 100 cc per hour (in terms of water) - used in scientific laboratories - to 25 cubic meters per hour (in terms of water) - used in large chemical industrial plants.

The company is currently developing flow meters for use in oxygen machines, involving flow of 0.5 to 5.0 litres per minute.

SALIENT FEATURES OF METERING TUBE

The metering tube has a high precision internal taper, made from thick -walled Borosilicate glass. For certain sizes, this may be a moulded tube with an external taper and for others, it may be a drawn tube with practically no outside taper. The metering tube can also be made out of Perspex or Stainless Steel.

A special feature of our process is the possibility of giving an Expanded Scale at any desired range of flow, within the specific flow range. The calibration marks are directly fused on the metering tube during the process of annealing. A white background is similarly fused into the glass surface, at the rear side. If required, etching and markings on the metering glass tubes are also provided, using ceramic based colours.

THE FLOAT

We generally offer Rotating Type floats, which are superior to the non-rotating type. Non-rotating floats may sometimes get stuck somewhere in the metering tube due to accidental ingress of tiny particles of dirt, or for any other reason, and this will usually remain unnoticed. This may mislead the operator, resulting in serious consequences.

READING OF FLUID FLOW ON THE SCALE

In the conical rotating type of floats, the flow should be read on the scale against the upper edge of the float. For viscosity compensating floats, this should be read against the central circular disc of the float. For ball type float, this should be at the middle of the float.THE FRAMEThe frame is usually made from Cast Iron and / or Mild Steel components. Depending upon the service requirements, the Trim Material (i.e parts coming in contact with the fluid), is made from Stainless Steel, or any other corrosion resistant material, such as Lead, Ebonite or rubber lining.

Our usual flange type rectangular frames are a bit heavy but are very sturdy. We do also supply sturdy but very light and simple types of frames. In addition to these, we supply instruments fitted in an elegant, moulded Bakelite frame for Purge Rotameters, frames for panel mounting, as well as frames with heavy base and leveling arrangements - for use on Laboratory Benches, with integral fine regulating valves. All Mild Steel and Cast Iron parts are given a black oxidized finish.

The pipeline connections are either flanged type, screwed type, or with built-in grip for insertion of rubber hose / tubing, depending on customers' specifications or service conditions. Usually we fit the metering tube by End Compression, by means of two end flanges, till it is leak proof. In addition, we provide for packing to be pressed from the outer periphery of either end of the metering tubes, by means of suitable packing press nuts. In certain other types, tubes are fitted with leak proof Rubber/Teflon O-rings.

THE GASKETS

The gaskets are usually cut out or moulded from synthetic rubber. Depending on the service conditions, these may be of Teflon, Neoprene etc.

THE END STOPS

Depending on service conditions, the end stops are made from Stainless Steel, Ebonite, PVC, Teflon, Lead etc.

THE GUARD

In some types of completed Rotameters, the metering tubes are protected by a metal pipe. In others, protective Perspex guards, safety glasses are provided in such a way as to enable easy removal for opening/cleaning.

 

FLOW RANGES

In Rotameters other than the Bypass type, flow ranges may cover from 100 cc/hr to as high as 30,000 l/hr in terms of water, and for gasses 10 cc/min to as high as 500 NM3/hr in terms of air.

We have been supplying instruments for liquids like Water, Caustic Soda solution, Brine, Hydrochloric acid, Sulphuric Acid, Nitric Acid, Oil (mineral and vegetable), Sugar solution, Formalin and various Organic Solvents. Gases Air, Hydrogen, Nitrogen, Oxygen, Carbon Monoxide, Carbon Dioxide, LPG, Synthetic gases (for Fertiliser Industry) etc.

Depending on the special requirement of the working conditions, the float can be made from Stainless Steel, Teflon, Anodised Aluminium, PVC, Ebonite, High density polythene or the like, with or without a Guide Rod, and with or without loading.

BYPASS ROTAMETERS

Bypass Rotameters are intended for measuring a very high rate of fluid flow. A built-in orifice of the required dimension is provided in the main flow pipe to ensure a desired proportion of flow through the bypass line. A complete Bypass Unit Consists of a built-in orifice, Bypass fittings and pipings, and a Rotameter on the bypass line.

PRICE & DELIVERY

Price may vary extensively, depending on the specifications, such as range of flow, material of construction of float, gaskets and frames etc. Price of the instrument may vary from INR 950 to INR 35,000, depending on these factors. The number of pieces of the same size instrument, ordered in one lot, and prospect of repeat order of the same size, would also have a significant implication on the offered price.

Our usual terms of payments are: 30% advance against order, rest against Proforma invoice, through bank, against delivery documents. Exceptions may also be made for regular customers.

Delivery period varies from two weeks to twenty four weeks, depending on the specifications. We usually send the instrument fully assembled. In order to protect the metering tube from possible damage by the metallic float inside it, we push tightly soft ribbon or the like from either end, to hold the float in a fixed position during transit. The whole assembled instrument is suitably packed in a sturdy wooden box, with appropriate supports.

WARRANTY

The Rotameters are made using Borosilicate glass tubes, with a metal float inside. A warranty is given for a period of 12 months from the date of supply - provided the instrument is used in a proper manner as per our operation manual.