Fluidyne Instruments Private Limited
Chembur, Mumbai, Maharashtra
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Process Instruments

We manufacture a comprehensive range of quality process instrument that includes - Level Gauges and Indicator, Flow Indicator and Flow Meters, Flow / Level Switches, Instrument Valves and Manifolds Rotameters, Magnetic Level Indicators, Liquid Level Indicators, Orifice Plate Assembly and more. High in performance, our range of process instruments are mainly used in the boilers, pressure vessels, pipelines, tanks, pumps, lubrication, hydraulic systems. These instruments have found to be functionally superior and high in utility and are used in various industries, such as - power plant, petro chemicals, oil, gas, edible oil, pharmaceuticals and more.

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Flow Switches offered comprise highly versatile instruments that can handle any type of fluids. These are made available in glandless designs that make these switches highly compatible with corrosive as well as toxic fluids. Available in easy-to-fix designs, the precision mechanical parts also assure of delivering high process as well as zero – failure possibilities. Here, the micro switch is operated using deflection of paddle/plunge assembly because of flowing-fluid velocity. Further, these switches can soo handle sensing of flow - no flow operations and only respond to velocity of fluid movement in duct area. Further, these also provide for positive signals that assist in detecting changes as well as loss of flow velocity.


  • Line size: 15mm to 1000mm (N.B.).
  • Mounting: vertical or horizontal pipe.
  • Range: refer table for standard range.
  • Repeatability / Accuracy: +1-5% of Maximum flow.
  • Process Connection: BSP/NPT for threaded versions, (1" or 1.1/4" NB) ANSI # RF for flanged versions, 1/2" to 12" pipe threads for integral, tee versions, special Sizes as per customer request
  • Maximum Line Pressure: 10 bar for brass body, 30 bar for SS BODY ( higher rating available on request up to 300 bar, 1 bar for duct mount version.
  • Maximum Process Temperature: 170 Deg.0 for brass body, 200 Deg.0 for SS body
  • Pressure Loss: 60 to 80 m bar at maximum flow
  • Mounting: vertical or horizontal pipe
  • Switching: snap acting SPCO, (SPDT), DPDT
  • Micro switch rating: 5A, 230V AC or 10A, 230V AC.
  • Dead Band: 5 to 10% of maximum flow ( 10% at min. set valve & 5% at max set valve )
  • Enclosures: pressure die cast aluminum weather proof to I.P.: 65 & flame proof to Gr. 11 A & 118 of IS : 2148: 1981, on request.

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Plunger-Flapper-Paddle-Diaphragm Types. Magnetic Glandless Switching. Micro Switch, Mercury and Air break type. Flanged, screwed connections. For Alarms, Tank overflow and motor control. Special design to: vertical/ horizontal flow. Level switch -Nine types for every application. Internal, external, side and top mounted. Micro Switch-Mercury, air break and air Valves. Operating Alarms, Motor Control, Level Control, Snap Action contacts with NO/NC contacts.

Model Type Connection Differential
MA 100 Internal Side Low Single Mercury/Micro Air valve Not reqd
MA 200 Internal Side Low Single Road Not reqd
MA 300 External Side Low Single Mercury/Micro Air valve Provided
MA 400 Internal Side Low Single -Do- Not reqd
MB 100 External Side & Bottom Low Single Mercury/Micro Air valve Provided
MB 200 External Side Low Single -Do- Provided
MB 300 External Side flanged Low Single -Do- Provided
MB 400 External Side flanged High Single/double -Do- Provided
MC 100 Internal Top Low Single -Do- Free gravity displacer
MC 120 Internal Top High Multiple -Do- -Do-
MC 200 Internal Top High Single/double Reed Free gravity displacer
MC 300 Internal Top High Multiple Mercury/Micro Air valve Free gravity displacer

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We have designed level gauges and valves with utmost care for getting the maximum economy. Your level gauge should have the same strength as your vessel to withstand the high pressures to which it is subjected and the corrosive characteristics of the fluid. Also, your valuable process fluid should never leak out through the glass fitting.

In industries, you may have to measure the levels of colorless liquids, interface of immisible fluids, liquids with sub-zero temperatures and liquids with too much foaming. All these requirements can be met with by our latest types of flat glass level gauges.
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These gauges are constructed with a solid forged steel bar main chamber and cover plates recessed to have perfect alignment of gaskets and glass. Though rated for 2000 psig. these are light weight and hence do not need any combursome supports for medium lengths. With special main chamber construction these gauges can be supplied upto 3000 psig. Main Chambers are available in C.S, M.S, SS304, SS316, P.P., P.V.C., FRP and Rubber lined. Gaskets are of CAF, GRAFOIL, TEFLON, NON-ASVESTOS, etc.

Reflex Gauges:

These are assembled with flat glasses with inner surfaces of reflecting prisms. Due to total internal reflection liquid level shows black in contrast to a mirror-like surface above, The gauges are used for services where observation is required at a distance and on low pressure boilers.

Transparent Gauges:

These are assembled with two numbers of totally transparent toughened glasses to give a through vision of liquid levels. These gauges are recommended for interface levels, coloured fluids where colour is of interest to the process behaviour and services where excessive foaming may exist. In high pressure boilers these gauges are recommended to be used with mica shields.


Teleflo engineers continuous research, development and experimental studies on glass toughening and composition has made the tempered glasses used in these gauges most dependable providing a high strength resistant to both thermal and mechanical shocks and with the highest degree of visibility.
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Our range of liquid level indicators are designed to provide high clarity indication of liquid level. The float-containing magnet in the indicator rises and falls with the liquid. As the float moves, this information is transferred to the indication rail mounted on the outside of the tube. The white and red indication flaps represent air and liquid level respectively. Liquid level is also indicated by follower - Magnet type indicator.

These magnetic level indicators, liquid level indicators can be mounted in various orientations, such as onto the side of the vessel and top of the vessel or if required on the bottom. Our range of Magnetic level indicators are used for high pressure, high temperature, colored and corrosive liquids.
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Our highly efficient remote water-level indicator, liquid level indicators detects the water-level fluctuations in the boiler drum. These liquid level indicators are very delicately designed to provide flawless indication's.

Remote Level Indicators

Our highly accurate remote level indicators help to keep a track on the displacement of the water levels in the boiler. When the water levels in the boiler rises, the increasing water column presses the red indicating liquid (sealing liquid) from the first phase into second phase and then indicates in the Inspection glass of the indicator. The water displaced from Phase one flows from the condenser into Phase three and then into the boiler. If the water level in the drum falls, then the indicating liquid in phase three in the inspection glass, falls correspondingly. The water vapor formation in the condenser takes place when the water level in phase three is constantly filled up.

  • Filling and air Relief Plug
  • Condenser
  • Screw Joint
  • Main shot off Valve (Steam)
  • Equalising Tube
  • Main Shot off Valve (water)
  • Screw Joint
  • Connection Pipes
  • Indicator Shot off Valve
  • Indicator Shut off vlave
  • Cleaning Plug of Valve
  • Cleaning Plug Inspection Clean
  • Requlating Valve

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We provide high quality and most effective range of tubular level indicators that suit various industrial applications. We also offer wide varieties of gauge glass protectors. Various types of tubular level gauges available with us are :

BCO - Offset Connection Tubular gauges  Our BCO tubular gauges are superior in quality that are manufactured with a pair of auto shut off ball check valves with offset and union construction. Because of their simple design, and their ability to work without additional isolation valves they can be installed very easily and cost-effectively. The innovative offset construction of the valves enables glass tube's to be replaced while in use. Whenever the glass tube breaks the ball check arrangement automatically closes the valve seat and prevents wastage of any fluid. Glass tube protection in the form of " Tie Rods" or "Pipe Shield" is provided.

HDO Heavy Duty Channel Protector Gauges Our highly effective tubular level gauges come with heavy wall glass tubes with 3 mm thick machine made channel protector. Designed to endure extreme conditions these valves offer very high durability.

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Our superior quality transparent level Indicators are equipped with heavy valve glass tubes fitted. These valve glasses are fixed with a heavy duty metallic frame, which is made from min. 3mm thick channel box type protectors. We can also provide auto-shut-off ball check, needle or ball valve isolator as an integrated part with these indicators, if required.

These are designed specially to endure to extreme conditions and they can easily withstand alignment stress. Our premium indicators are available in two varied models : Side Mounted type and Top Mounted type.
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Our side mounted indicators are designed keeping in mind the extreme conditions they would have to face. They are manufactured using very strong materials and hence also provide prolonged durability. These indicators have built-in glands and we can also provide valves if required.

Process Connection Flanged on Screwed union
Glass Tube Borosilicate, Heavy wall
Packing PTFE Gland
Guards Rectangular box type change; machine made from min. 3 mm C.S. Sheet
Scale Bakelite of Acrylic engraved
Least Count 0.5 cms. Or as per request
Rating 5 kg/cm² to 15 Kg/cm² depending on length
CC Distance Max. 6 m
M.O.C (Contact parts)M.S, C.S., SS 304, SS 316, P.P., HDPE, PVC, Teflon, F.R.P., and any other on request.

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Top mounted level indicators offer high levels of security to the storage tanks. Since they are mounted at the top of the tank, it reduces the risk of hazardous fluids getting spilled through any leakage. Theres a float that is channelized in the tank by a perforated pipe and a sealed glass tube. Float steam tip has an in-built pointer, which correctly indicates the level.

Mounting Flange Standard 4" NB or 6" NB
Float SS304, SS316, P.P., HDPE, PVC, TEFLON, Glass, etc.
Guide Pipe M.S., C.S., SS304, SS316 with Collar, HDPE, P.P., P.V.C. TEFLON, FRP, etc.
Indicator P.P., PVC, or Teflon.
Scale Acrylic or Bakelite with least count of 0.5 cm or as per request.
Tank Depth 3.5 to 5 metres

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Highly efficient, our float and cord level indicators are perfectly aligned and come with a pulley and scale. Our float and level indicators are highly suitable for outdoor usage, as they use dust proof pulley housing. Spring Tensioning assembly is also provided additionally for guide wires. The floats available by us can be custom designed as per specific industrial requirements.

  • For all types of Storage Tanks.
  • Perfectly Aligned guide wire, pulley and scale.
  • Ideal for outdoor installations. Cast Aluminum Pulley Housing.
  • Spring Tensioning assembly for Guide wires.
  • Float available of various desired designs and materials as per applications

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Weldneck, screwed, slip-on forged flanges. Flange taps, vent and drain. Orifice plate of SS, Monel with tag. Plat design as per B.S./A.P.I. Std. H.T. Bolts and Nuts. Jack screw provision.
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Available in Flanged, Screwed and Pad types. Double/Single Window Full View, Angular. Rotating wheel, Flapper and Dip tube design. S.S.C.I, C.S, Bronze, P.V.C, P.P, Lining of Rubber, Teflon, Lead, F.R.P. Plain and Reflex gauge glass. Toughened Borosilicate, Moulded, Pyrex. Rectangular, Round, Cylindrical. Peep-hole glasses with mica for high temperature. Pad mounted-Round/Rectangular.

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Manometers, industrial manometers are used in various industrial application for pressure and vacuum measurements. Manometers and industrial manometers are also used for flow measurement techniques. They are available in wall-mounting or pedestal type and 'U' tube or single limb type. The manometers, industrial manometers may be of inclined type or provided a vernier scale for obtaining greater accuracy.

The normal accuracy of the manometer is 1 mm but by providing a inclined tube 0.1 mm or better accuracy can be obtained. A movable vernier can further provide a readability of 0.1 mm. Gradiations in inches and cms are Standard Special type of Scales can be provided to take care of specific requirements,

Single Limb Manometers

Are provided with a well which has a much larger area to that of the manometer tube and the level variation in the well is negligible to the rise in level in the Manometer tube. The Scales of these manometers are also prepared in such a manner as to compensate the level change in the well. Multi tube manometers with individual wells are used for multiple reading of pressure and also suitable for tank level gauging with purge tube.

'U' Tube Manometer

The standard 'U' tube type manometer has two straight glass tubes with a 'U' bend at the bottom end. These . manometers are provided with top and bottom blocks and fitted with such accessories like external zero adjuster valve, safety cover, filling and drain plugs, catch pots, zero leak ball check valves, zero adjustable scale, vernier scale, leveling screws, swiveling body, etc.


1/8" / ¼" / ½"; BSP, NPT, Ferrule or hose connector.


Maximum range 0-3000mm

Check Valve and Return Wells

Check valve is used to prevent the fluid from leaving the manometer if the instrument is operated beyond the range, either due to high range or surge conditions. Return wells are used to prevent loss of the indicating fluid by collecting the over flow fluid and returning it to the Manometer.

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We have pleasure in introducing our superior variable area flow meters and rotameters and industrial rotameters with special types offered for general industrial service and instrumentation requirements. Glass tube rotameters are offered where general flow measurements are within the limitations imposed by pressure rating of the glass metering tubes. For higher pressure ratings we offer metal metering tubes. Rotameters and industrial rotameters manufactured are of panel mounted types as well as pipe line mounted types. The pipeline mounted instruments are constructed to withstand pipeline installation stress, strain and vibrations. The unique gland arrangement ensures zero leakage and long life to the metering tube.

Purge Meter

(Low-Flow Rotameters) : Measure low flows of gas, air, water with accuracy using this type of flow tube. This is ideal for laboratory or instrumentation applications. Mounting can be panel or by optional tripoid base. Available in complete acrylic body or stainless steel body with glass metering tube. Dependable flow control is provided by needle valve located at inlet front of frame. Center line dimensions standard for back panel mounting are 65mm, 150mm and 200mm.

Model No Float Mat Meter Size Maximum Flow Rate PR Loss Water Kg/CM² PR Loss Air Kg/CM² Max Tube Rating Kg/Cm²
      Water LPH Air LPH Air Nm³/hr      
RM-0-A PTFE 6 5 160 0.16 0.10 0.05 15
  SS   10 300 0.30      
RM-0-B PTFE 6 10 320 0.32      
  SS   20 600 0.60      
RM-0-C PTFE 6 20 640 0.64      
  SS   40 1200 1.20      
RM-0-D PTFE 6 40 1280 1.28      
  SS   80 2400 2.40      
RM-0-E PTFE 15 80 2560 2.56 0.15 0.07 12
  SS   160 4800 4.80      
RM-0-F PTFE 15 100 3200 3.20      
  SS   200 6000 6.00      

Note: Calibration Done for any desired flow range for any gas / liquid

Full - View Rota meters

(Glass Tube Type for General Industrial Service) : These glass tube variable area rotameters are designed to provide visual indication of flow of wide range of transparent to semi-transparent liquids and gases. They are of robust construction with dowelled side plates, interchangeable glass metering tubes and floats and wide-view windows at front and rear. Flow range can be readily changed by detachable scales.
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By-pass rotameters are suitable for economical measurement of flow in larger pipelines generally 2" NB to 14" NB. The construction is simple and reliable consisting of orifice plate with carrier ring and a shunt rotameter. The flow rate through the rotameter is proportional to the pressure drop across the orifice plate created by the main flow and is calibrated accordingly. During installation care should be taken to ensure laminar flow in the pipe section. Orifice plate dimensions are based on ISA/ ISO/BS standards.

Model No Size NB Maximum Flow Range Carrier Ring Dimns
  Water m³/hr. Air Nm³/hr. O.D MMThickness mm.

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Armoured metal tube rotameters are recommended for liquids or gases where process or operating conditions make all-metal construction desirable. This type of rotameter is also usefui for metering opaque fluids. The meter is manufactured in various materials of construction and with 150,300 or 600 # flange connections. In our model RMC - 100 an extension with magnetic lenier indicating scale is bolted to the meter to indicate the float position. In another modification model RMC - 200 a dial type of indicator is provided.
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Sensitron Thermocouples and wells are designed for making available to the industry a complete range of thermocouples for measuring temperatures from 150°C to 1600°C and, are highly accurate and sensitive. These thermocouples are offered with a very wide range of thermowells of different materials to suit the application.

Basically, a thermocouple is composed of two dissimilar metal wires butt welded together in a circuit. The circuit develops a small EMF, in accordance with See back effect, between the measuring and reference junctions. This EMF can be measured by means of any pyrometer in terms of temperature.

Sensitron Thermocouples are fabricated by gas or arc welding or resistance welding in accordance with ISA recommendations.

Special Thermocouple

The assembly consists of single or duplex thermocouple elements with cylindrical ceramic insulators encased in a spring loaded stainless tube. It is supplied with a screwed cover head and pipe nipple with 4 ¼' NPT mounting thread. In order to get highest speed of response to a temperature change, the last inch of the bore in the well is reduced in diameter to provide a tight fit around the sensitive tip of the thermocouple. The spring loaded feature ensures positive metal to metal contact between the thermocouple and well allowing the highest possible rate of heat transfer to the measuring junction. Spring pading also allows movements of the thermal element due to expansion and contraction without damage to the element or connecting head and terminal block.
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Our range of Purge Level Indicator is used for remote indication in storage tanks, process vessels, reactors, settlers, evaporators, re-boilers and filters. With it, the tanks can be opened, pressurized or even evacuated at any altitude & at a distance around a radius of 200 feet. This is heavily used for consistent indication of the level of corrosive and hazardous chemicals. Centralized indication of level of various storage tanks is made feasible, which will help in economic and precise handling of liquids in tanks during transfer, mixing and dispatch and also help in inventory control.


The working of this system is briefed below:


  • Inert gas is purged into the system at a small negligible rate ( approx 5-10 LPM) through a drop pipe fitted in the tank or vessel
  • Back pressure created by the level of liquid is transmitted to the panel mounted or wall mounted single limb manometer remote indicator
  • This indicator can be directly calibrated in terms of level of liquid, length units, volume units or weight units
  • An equalizing line is provided for pressurization or evacuation
  • The tank pressure and the manometer pressure are equalized
  • The system consists of the following:
  • Level Indicator ( Dial Type or Manometer Type )
  • Purge rate Indicator ( Rotameter or Bubbler ) ( SS/AL ) ( G.M. / S.S. )
  • Drop pipe (C.S. / S.S. / P.V.C. / P.P.)
  • Constant differential pressure & flow controller ( AL )
  • Air filter regulator (AL) with drain cock and output gauge

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Fluidyne Knob Type Oil, liquid level indicator or sight glasses are compact simple level indicators, suitable for installation on oil tanks, gear boxes and small tanks etc. The knob type level indicator are available in Aluminum, Brass, Bronze, Mild Steel, Stainless Steel and other materials on request. Knob type Level Indicator have simplicity of mounting where a single tapping is only required on the tank or reservoir. Fluidyne Knob Type Level Indicators have a star type reflector- cum- indicator behind the glass windows for better visibility of oil or liquid level.
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Fluidyne Instruments Private Limited

Sampath (Director)
70-D/3, Uday Building, Central Avenue Road Near Hotel Grand Central, Chembur East
Mumbai - 400071
Maharashtra, India
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