Monday, 22 October 2018

Pressure Gauges

Contemporary technology, Skilled craftsmanship, Commitment to excellence. All these, and more, have made A.N. Instruments the most trusted name in pressure and temperature gauges. And, have helped obtain approval from leading project consultants in India and abroad.

 

A.N. Instruments was established in the early 1970's.  Over the past two and a half decades, the company has continually expanded its product range, which now includes special purpose pressure gauges, regulators and circular chart data recorders.

 

Its dedication to quality is reflected- in the manufacturing process, which involves rigorous quality and performance tests of all raw materials and components.  Further, 100% inspection of every single piece, including leakage testing at sealing points, is mandatory.  This meticulous procedure ensures consistent, trouble-free performance over years of use in hostile environments and helps avoid repeated, often troublesome, adjustments.

To cater to the increasingly stringent requirements of continuous process industries, and guarantee zero defect performance of its ever-increasing product range, A. N.'s R & D Department has designed a comprehensive array of testing equipment to simulate various environmental conditions.

 

PRESSURE GAUGES

Elastic pressure gauges indicate the relative difference between the pressure of the medium and the surrounding atmosphere.  The construction is simple and robust; no additional source of energy is needed for its operation.  Among the existing types of sensing/elastic elements, the most commonly used are:

 

Bourdon Tube Pressure Gauges

 

These are used for measurement of pressure and vacuum and are suitable for all clean and non-clogging liquid and g us media.  The Bourdon Tube is a thin walled tube of oval cross section, which may be of 'C' form or spirally wound.  This tube expands when pressure is applied internally; this expansion is converted into rotation of a concentric pointer with a gear movement. The reading indicated on a dial by the pointer is proportional to the pressure applied.  C-type Bourdon tubes are used for low pressure ranges and helical / spiral tubes for higher pressure ranges.

 

Capsule Pressure Gauges

Capsule Pressure gauges are designed for measuring low/very low pressures and vacuum.  The pressure medium needs to be gaseous.  The capsule consists of two diaphragms joined and sealed around their circumference.  Several such capsules may be combined to enable measurement of very low pressures.  Normally, pressure is applied to the inside of the capsule, which changes shape as a result.  By means of a link and gear movement system, this deflection is converted into rotation of a concentric pointer indicating pressure on a dial.

 

Differential Pressure Gauges

These gauges are intended for measuring the pressure differential existing across two media or two parts of a system.  All common pressure elements are used, as the application demands.  The pressure element separates the two pressurized media, and deflects proportional to the difference in pressures between the media, irrespective of the absolute pressures applied.  This deflection is converted into the rotation of a concentric pointer on a dial, similar to regular pressure gauges.  The absolute value of either of the pressures is not usually indicated.

 

Chemical Sealed Pressure Gauges

These gauges can accurately measure process pressures, even under high temperatures and involving corrosive/abrasive/highly viscous/toxic/ heterogeneous process substances.  Of the three types of chemical seals (each with specific advantages in particular service conditions) A. N. Instruments manufactures two types - Diaphragm Seal type and Flange type.

 

TEMPERATURE GAUGES/ DIAL THERMOMETERS

Temperature reflects the momentous thermal condition of a homogenous material.  Measurement of temperature normally requires close, direct contact between the material and the sensor in such a manner that the sensor responds quickly to the temperature of the material.

 

The two types of dial thermometers manufactured by A. N. Instruments are as follows:

Bi-metal thermometers

The bimetallic element consists of two strips of different metals, with different thermal expansion coefficients, inseparably joined together.  This strip is spirally or helically wound with one end fixed to the body of the thermometer, and the other attached to the axis of a pointer.  Measurement of temperature is made with the bimetallic system inside the temperature sensor.  Temperature variation influences the bimetallic strip such as to rotate the pointer; this rotation is indicated on a dial.

 

Mercury-in-steel /GAS Filled thermometers

These thermometers enable measurement of temperature with an accuracy of ± 1% of the maximum scale value.  The thermometer system comprises a sensor bulb, transmitting capillary and a case containing a Bourdon Tube element.  The system is filled with pressurized mercury or pressurized inert gas (for gas filled thermometer).  Temperature variation is measured by the Bourdon Tube system, and indicated on a dial.

 

Apart from AN Instruments’ gauges, Emex Systems Limited has over ten years experience in the supply of Electrical, Technical Tools and Auto Components, Masoneilan level Instruments, Fisher Control Pressure Gauges among others.

 


Title

Standard Series

Panel Mounting Series

Safety Pattern Gauge

Welding Gauge

Medical Gauge

Sensing Element

Bourdon Tube

Bourdon Tube

Bourdon Tube

Bourdon Tube

Dial Size

100,150 mm

 

100,150 mm

150 mm

50 mm

Accuracy

+ 0.5% FSD

+ 1% FSD

 

+ 0.5% FSD

+ 1% FSD

+ 1% FSD

+ 1.5% FSD

+ 2% FSD

Scale Range

Upto 1000kg/cm2

.or Bar

 

Upto 1000kg/cm2

.or Bar

Upto 1000kg/cm2

.or Bar

Upto 280kg/cm2

.or Bar

Wetted Parts

Stainless Steel

Cu-alloy

 

Stainless Steel

Cu-alloy

Stainless Steel

Cu-alloy

Stainless Steel

Cu-alloy

 

Title

Test Gauge

Chemical Sealed Unit Diaphragm Gauge

Capsule Pressure Gauge

Differential Pressure Gauge

Sensing Element

Bourdon Tube

Bourdon Tube/ Diaphragm

Capsule

  Diaphragm

Dial Size

200, 250 mm

100, 150 mm

100, 150 mm

150 mm

Accuracy

+ 0.25% FSD

 

+ 1% FSD

+ 1% FSD

+ 1.5% FSD

+ 2% FSD

+ 2.5% FSD

Scale Range

Upto 400kg/cm2

.or Bar

Upto 800kg/cm2

.or Bar

Upto 6000mm   WC

Upto 4 kg/cm2

.or Bar

Wetted Parts

Stainless Steel

 

Stainless Steel

Stainless Steel

Stainless Steel

Pressure Connection

Bottom entry only

½” NPT (M)

½” BSP (M)

 

Bottom entry only

½” & ¼” NPT (M)

½” & 3/8” BSP (M)

M20 x 1.5 (M)

Bottom entry only

½” & ¼” NPT (M)

½” & 3/8” BSP (M)

M20 x 1.5 (M)

Bottom entry only

¼” NPT (F), ½” NPT & BSP, M20 x 1.5 through adapter & stainless steel diaphragm, D.P. Chamber H.P & L.P.

Case Material

Cast aluminium, stove enameled black.

Stainless Steel/

Die-cast aluminium, stove enameled black.

Stainless Steel/

Die-cast aluminium, stove enameled black.

Stainless Steel/

Die-cast aluminium, stove enameled black.

Optional Extras

·  Point-topoint calibration certificate

·  Stainless steel pressure system liquid filled

·  Flanged connection

·  All wetted parts lined or coated with special materials

·  Urea type/water type

·  Pulp gauge

·  Electrical contact

 

·  Electrical contact type

 

·  Vacuum/ Compound

 

 

 

·  Sealed system

·  Electrical contact

 

 

Title

Mud Gauge

Draught Gauge Vertical Edgewise

Bimetal Dial Thermometer

Mercury-in-Steel/ GAS Filled Dial Thermometer Rigid/Capillary type

Sensing Element

Stainless Steel Diaphragm/Bourdon

Capsule

Bimetal helix / spiral

Stainless Steel Bourdon tube

Dial Size

100,150 mm

5” (125 mm)

63, 100,150mm

100,150 mm

Accuracy

+ 1% FSD

+ 1% FSD

+ 1% FSD

+ 1% FSD

Scale Range

Upto 800kg/cm2

.or Bar

Upto 6000 mm WC

-20oC to 400oC/F

 

Wetted Parts

Stainless Steel

 

Stainless Steel

 

Stainless Steel

 Stainless Steel

Pressure Connection

Direct Mounting with bottom entry only

 

2” NPT (M)/2” API (M)

Flush panel Back entry only

 

1/8” BSP & NPT

¼” BSP & NPT

½” BSP & NPT

through adapter

½” NPT (M)

½” BSP (M)

M20 x 1.5 (M)

½” NPT (M)

½” BSP (M)

M20 x 1.5 (M)

Case Material

 

Gun metal

 

Mid Steel

Stainless steel/ cast aluminium, stove enameled black

Stainless steel/ die cast aluminium, stove enameled black

Optional Extras

Sealed Unit:

Sensing element:

S S diaphragm Chamber: S S Sealing Fluid: Silicon oil/Glycerine Process connector material: M.S.

 

 

Flange with Thermowell, Rigid Stem

Flange with Thermowell, Rigid Stem, with every angle stem Electrical contact.

 

 

Diffusion Resistant Regulators

 

 

 


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