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A L M Engineering & Instrumentation Private Limited
Kurla, Mumbai, Maharashtra

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Our Products

  1. Transmitter Device 40 Products available
  2. Measurement Gauges & Fittings 23 Products available
  3. Measuring Instruments & Equipment 23 Products available
  4. Pressure Switches 22 Products available
  5. Manometers 15 Products available
  6. Kitchenware And Cookware 10 Products available
  7. Medical Accessories 10 Products available
  8. Anemometer 9 Products available
  9. Process Control Systems & Equipment 6 Products available
  10. Industrial Pump 6 Products available
  11. Others Products 107 Products available

Pressure Switches

Leading Manufacturer, Supplier & Retailer of Aerosense Air Flow Transmitter, Series H3 Explosion-Proof Differential Pressure Switch, Series DX Wet/Wet Differential Pressure Switch, AT3A3000 ATEX Approved Photohelic Switch and 3000MRS Photohelic Switch.

Aerosense Air Flow Transmitter

Aerosense Air Flow Transmitter
7,250 /Piece Get Latest Price
  • Brand Aerosense
  • Input pressure (pascal) 1000pascal
  • Adjustment time interval 10 minutes
  • Model number/name Dpt-flow
  • Air Velocity/Flow range Upto 20000 fpm
  • Output Pressure Upto 7000 Pa
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Series H3 Explosion-Proof Differential Pressure Switch

Series H3 Explosion-Proof Differential Pressure Switch
  • Product Applications Water flow proving with an orifice plate.
  • Differential pressure across chiller. Perfect for monitoring differential water pressure on filters, chiller coils, and flow elements.
Explosion-proof, heavy duty, industrial unit has a unique new design which provides sensitivity to differential pressures as low as 10 inches of water (254 mm w.c.), yet handles total pressure of 1500 psi (103 bar). Unlike common differential pressure switches that use a piston-type motion transfer, the Series H3 utilizes a rotary motion transfer shaft that prevents a change in total pressure from causing a setpoint shift. Unit yields deadbands approximately 5% of range, with zero setpoint shift due to variation in working pressures. Friction is minimized and repeatability increased by allowing range spring to act directly on diaphragm plate. Rolling diaphragm design maintains constant effective area to further reduce friction. Diaphragm is allowed to "seat", allowing application of full rated pressure, up to 1500 psi (103 bar), on either high or low pressure port, without damage. Special over-travel feature prevents overtightening of range adjust screw. Choose optional 316SS chamber for water and water-based fluids or harsher applications.
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Series DX Wet/Wet Differential Pressure Switch

Series DX Wet/Wet Differential Pressure Switch
The Series DX is a differential pressure switch that makes a contact output based on the differential between two pressure sources. Wetted materials of brass and flouroelastomer are suitable for use with most gases and water based solutions. The switch can be used for low differential pressure indication with set point on a decrease of pressure as low as 1 psid (0.07 bar). Differential set point ranges are available from 2.5 to 75 psid (0.17 to 5.17 bar) on increasing differential pressure and 1.0 to 67 psid (0.07 to 4.62 bar) on decreasing differential pressure. Unit features a high static pressure rating of 200 psig (13.8 bar) for higher static pressure applications. Standard is a weatherproof, UL type 4X, enclosure for dust laden, outdoor, or wash-down installation environments. Series DX incorporates an externally adjustable set point, integral mounting flange and a removable electrical terminal block for quick and easy installation. The DX uses opposing diaphragms to sense the high and low pressure with a pivot mechanism that transfers the difference of the two pressures to the SPDT switch. Product Applications Indicating filter differential pressure. For example initiating water filter backwash as the filter becomes clogged on increasing differential pressure.Proof of flow indicator monitoring differential pressure from a sensing device. For example sensing the pressure across an orifice plate to prove water flow.Proving flow through a pump by sensing the pressure across the pump to make sure the pump does not run dry.Proving flow through a chiller. Often called evaporator water pressure drop.Proving flow through a heat pump or AC unit. Often called a condenser water lock-out switch.
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AT3A3000 ATEX Approved Photohelic Switch

AT3A3000 ATEX Approved Photohelic Switch
  • Important notes for installation: Cables must be fitted through 1/2" NPT cable gland or ATEX conduit (not supplied with instrument), Open cover only after de-energizing instrument.
Flame-proof ATEX approved Photohelic SwitchGages, Series AT3A3000, function as versatile, highly repeatable pressure switches combined with a precise pressure gage employing the time-proven Magnehelic gage design. The Photohelic switchgage measures and controls positive, negative or differential pressures of air and compatible gases. Standard models are rated to 25 psig (1.7 bar) with options to 35 psig (2.4 bar) or 80 psig (5.5 bar). Two phototransistor actuated, DPDT relays are included for lowhigh limit control. Easy to adjust set point indicators are controlled by knobs located on the gage face (accessible opening case after de-energizing instrument). Set points can be interlocked to provide variable dead band ideal for control of fans, dampers, etc. Gage reading is continuous and unaffected by switch operation, even during loss of electrical power. Flame-proof ATEX enclosures are available in aluminum with glass window which allows for viewing of set point needles and process pressure.
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AT3A3000 ATEX Approved Photohelic Switch

AT3A3000 ATEX Approved Photohelic Switch
  • Important notes for installation: Cables must be fitted through 1/2" NPT cable gland or ATEX conduit (not supplied with instrument)., Attention: Check local safety rules and warnings on unit and manual for a correct use of the instrument in hazardous area.Etc.
Flame-proof ATEX approved Photohelic SwitchGages, Series AT3A3000, function as versatile, highly repeatable pressure switches combined with a precise pressure gage employing the time-proven Magnehelic gage design. The Photohelic switchgage measures and controls positive, negative or differential pressures of air and compatible gases. Standard models are rated to 25 psig (1.7 bar) with options to 35 psig (2.4 bar) or 80 psig (5.5 bar). Two phototransistor actuated, DPDT relays are included for lowhigh limit control. Easy to adjust set point indicators are controlled by knobs located on the gage face (accessible opening case after de-energizing instrument). Set points can be interlocked to provide variable dead band ideal for control of fans, dampers, etc. Gage reading is continuous and unaffected by switch operation, even during loss of electrical power. Flame-proof ATEX enclosures are available in aluminum with glass window which allows for viewing of set point needles and process pressure.
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3000MRS Photohelic Switch

3000MRS Photohelic Switch
  • Product Applications Fan Control, Damper Control, Environmental Pollution Control.
Using solid state technology, the Series 3000MR and 3000MRS Photohelic switchgages combine the functions of a precise, highly repeatable differential pressure switch with a large easy-to-read analog pressure gage employing the durable, time-proven Magnehelic gage design. Switch setting is easy to adjust with large external knobs on the gage face. Gage reading is unaffected by switch operation - will indicate accurately even if power is interrupted. Solid state design now results in greatly reduced size and weight. Units can be flush mounted in 4-1316" (122 mm) hole or surface mounted with hardware supplied. 3000MR models employ versatile electromechanical relays with gold over silver contacts - ideal for dry circuits. For applications requiring high cycle rates, choose 3000MRS models with SPST (N.O.) solid state relays. All models provide both low and high limit control and include 18-inch (45 cm) cable assemblies for electrical connections. Gage accuracy is 2% of full scale and switch repeatability is 1%. Switch deadband is one pointer width - less than 1% of full scale. Compatible with air and other non-combustible, non-corrosive gases, they can be used in systems with pressures to 25 psig (1.725 bar). Optional construction is available for use to either 35 psig (2.42 bar) or 80 psig (5.51 bar). Included Accessories: mounting ring, snap ring; 18" (45 cm) cable assembly; (2) 316" tubing to 18" NPT adapters; (2) 18" NPT pipe plugs; (4) 6-32 x 1-14" RH machine screws (panel mounting); and (3) 6-32 x 516" RH machine screws (surface mounting).
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MP Mini-Photohelic Differential Pressure Switch

MP Mini-Photohelic Differential Pressure Switch
The Series MP Mini-Photohelic differential pressure switchgage combines the time proven Minihelic II differential pressure gage with two SPDT switching set points. The Mini-Photohelic switchgage is designed to measure and control positive, negative, or differential pressures consisting of non-combustible and non-corrosive gases. Gage reading is independent of switch operation. Switching status is visible by LED indicators located on the front and rear of the gage. Set points are adjusted with push buttons on back of unit. This extremely compact switchgage is ideal for fume hoods, dust collection, pneumatic conveying and clean room applications.
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PDPS Compact Economic Differential Pressure Switch

PDPS Compact Economic Differential Pressure Switch
The Series PDPS's large diameter diaphragm and snap action switch make it dependable and ideal for OEM applications. The Series PDPS Pressure Switches are available for pressure, vacuum, and differential applications and are factory preset for pressures from 0.07 in. of w.c. to 1.0 in. of w.c. with full-scale repeatability of 0.02 in. of w.c. Other features of the PDPS pressure switch include standard multi-barb port connections, inherent mounting and quick disconnect terminals, which make the Series PDPS perfect for many OEM applications.
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1700 Low Differential Pressure Designed Switch

1700 Low Differential Pressure Designed Switch
  • Product Applications High efficiency furnaces, Duct pressure monitor, Laboratory fume hoods, Monitor air filtercondition Etc
Series 1700 Differential Pressure Switches were specifically designed to satisfy the demands of high volume original equipment manufacturers for a tough, dependable limit switch at a very low price. The Model 1710 uses Dwyer's simple, time-proven method of mechanically coupling a sensitive 3" diameter silicone rubber diaphragm to a versatile SPDT snap switch. The switch housing is precision molded of a high strength glass filled PPO which has excellent dimensional and thermal stability. This unique combination of existing and new technologies enables Dwyer to offer a limit switch priced less than comparable units without sacrificing performance. Installation is fast and simple with twist and tighten mounting screw slots, 14" quick connect electrical terminals and dual size barbed pressure ports for 18" and 316" ID vinyl or rubber tubing. For use with air and other non-combustible, non-corrosive gases, switches are UL and CSA recognized. Two models are offered with field adjustable ranges from .15 to .55" w.c. and .50 to 7.5" w.c. Units are rated for 2 psig maximum system pressure, temperature limit is 190F and weight is only 4 oz.
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EDPS Differential Pressure Switch

EDPS Differential Pressure Switch
  • Product Applications Monitoring industrial cooling-air circuits, Monitoring air filters and ventilators, Monitoring flows in ventilation ducts, Frost protection for heat exchanges Etc.
The Series ADPSEDPS Adjustable Differential Pressure Switch is designed for pressure, vacuum, and differential pressures. The dual scaled adjustment knob in inches water column and pascals allows changes to the switching pressure to be made without a pressure gage. The ADPSEDPS is available with settings from 0.08 in w.c. (20 Pa) up to 20 in w.c. (5000 Pa). The silicone diaphragm and PA 6.6 body make the series ADPS ideal for use with air and other noncombustible gases. Series EDPS models meet UL508 and are constructed of plenum rated plastics. The compact size, adjustment knob and low cost make the ADPSEDPS the perfect choice for HVAC applications.
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AT1ADPS ATEX Approved ADPS Adjustable Differential Pressure Switch

AT1ADPS ATEX Approved ADPS Adjustable Differential Pressure Switch
  • Important notes for installation Cables must be fitted through 1/2" NPT cable gland or ATEX conduit (not supplied with instrument) Etc.
The ATEX approved Series AT1ADPS Adjustable Differential Pressure Switch is designed for pressure, vacuum, and differential pressure applications in hazardous areas. The dual scaled adjustment knob in inches water column and pascals allows changes to the switching pressure to be made without a pressure gage. The switch is available with settings from 0.08 in w.c. (20 Pa) up to 16 in w.c. (4000 Pa). The silicone diaphragm makes this series ideal for use with air and other noncombustible gases. Flame-proof ATEX enclosures are available in aluminum and can include a glass window for viewing set point status on adjustment knob.
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1800 Low Differential Pressure Switch

1800 Low Differential Pressure Switch
Essential for industrial environments, the Series 1800 combines small size and low price with 2% repeatability for enough accuracy for all but the most demanding applications. Set point adjustment inside the mounting stud permits mounting switch on one side of a wall or panel with adjustment easily accessible on the opposite side. UL and CSA listed, and FM approved. CAUTION: FOR USE ONLY WITH AIR OR COMPATIBLE GASES.
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AT21823 ATEX Approved 1823 Differential Pressure Switch

AT21823 ATEX Approved 1823 Differential Pressure Switch
Essential for industrial environments, the ATEX approved Series AT21823 combines small size with 2% repeatability. Set point adjustment inside the switch allows for set point settings across 9 ranges from the low of .07 in w.c. to a maximum 85 in w.c. differential pressure. Series AT21823 flame-proof ATEX enclosures are available in aluminum and are ideal for low pressure hazardous area applications. Various housing options such as an overpressure relief valve or external setpoint adjustment knob are available. External setpoint knob allows adjustment without opening the enclosure.
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AT11910 ATEX Approved 1910 Differential Pressure Switch

AT11910 ATEX Approved 1910 Differential Pressure Switch
Our most popular Differential Pressure Switch is now available in an flame-proof ATEX approved package in the AT11910 Series. This pressure switch combines advanced design and precision construction to make these switches able to perform many of the tasks of larger, costlier units. For air and non-combustible compatible gases, the AT11910 Series switches have set points from 0.07 to 20 in w.c. (1.8 to 508 mm). Set point adjustment is easy with range screw located inside the switch enclosure. Series AT11910 ATEX enclosures are available in aluminum enclosures and ideal for low pressure, hazardous area applications. Important notes for installation: Cables must be fitted through 12" NPT cable gland or ATEX conduit (not supplied with instrument).Make sure after cabling to close tight cover and cable gland, in order to keep IP66 rating (IP65 with option OPV, overpressure relief valve).Open cover only after de-energizing instrument.Attention: Check local safety rules and warnings on unit and manual for a correct use of the instrument in hazardous area.
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Series 1996 Gas Pressure Switch

Series 1996 Gas Pressure Switch
Reliable and convenient, the 1996-5 and 1996-20 Gas Pressure Switches serve as a compact, low cost switch for gas fired furnaces and equipment. Pressure ranges for both models are ideal for high or low gas pressure interlock. Visible set point and on-off indicators add convenience in servicing. Use either NO or NC contacts on SPDT switch. Bottom connection has both 18" female and 14" male threads for pipe nipple or coupling. Top connection vents diaphragm chamber to outside or to furnace combustion chamber. Mount switch with diaphragm in a horizontal position and gas pressure connection at bottom. Used with natural, manufactured or LP gas. Also see Model 1950G.
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CXA Water Pump Pressure Switch

CXA Water Pump Pressure Switch
  • Product Applications Pump control for water systems.
The Series CXA Water Pump Pressure Switches have been proven reliable for controlling automatic water systems. These switches are very popular for use on water well pumps and pumping systems. The set point and deadband are both easily adjustable via screws inside the cover. For ease of installation, the switches come with a 14" female NPT process connection and can be mounted in any orientation. The series CXA's simple design makes it a great switch for an installer at any skill level.
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Series CX Compressor Pressure Switch

Series CX Compressor Pressure Switch
The Series CX Compressor Pressure Switches are designed with a 20 amp normally closed SPST switch for direct control of pumps and motors. The set point and deadband are both easily adjustable via screw terminals inside the cover. For ease of installation, the switches come with a 14" female NPT process connection or the optional 4-port connection block on the CX-4 models. Besides making installation easier, one of the other ports can be used to install a pressure gage. Plus, these switches can be mounted in any orientation. These units are perfect for regulating tank pressure on small air compressors. The CX series switches come with an unloader valve, which prevents compressors from starting under load. They also come with an autooff disconnect lever for manually cutting off the load. When the lever is in the off position, there is a test button inside the housing that can be pushed to turn on the load.
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Series MVS Miniature Vacuum Switch

Series MVS Miniature Vacuum Switch
Compact, lightweight, and adjustable, the Series MVS Miniature Vacuum Switch is specially designed for OEM applications. This low cost switch has a minimum life expectancy of 10 million cycles and has an extremely fast response time. Typical applications for the MVS are HVAC, home appliance, dairy systems, medical, office equipment, and pump control.
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MHS Miniature High Sensitivity Pressure Switch

MHS Miniature High Sensitivity Pressure Switch
The Series MHS Miniature High Sensitivity Pressure Switch offers a wide range of field adjustable pressure set point options. The compact switch can be used with air or other compatible fluids. Ideal application is for turning pumps and compressors on and off when levelschange. The Series MHS models offer a variety of electrical ratings to suit application needs. The switch is easy to install and easy to adjust, with a long mechanical life of over 10 million cycles.
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3000MRS ATEX Approved Photohelic Switch

3000MRS ATEX Approved Photohelic Switch
Using solid state technology, the Series AT23000MR and AT23000MRS ATEX Approved Photohelic SwitchGages combine the functions of a precise, highly repeatable differential pressure switch with a large easy-to-read analog pressure gage. Gage reading is unaffected by switch operation and will indicate accurately even if power is interrupted. AT23000MR series employ versatile electromechanical relays with low amperage ratings-ideal for dry circuits. For applications requiring high cycle rates, choose AT23000MRS models with SPST (NO) solid state relays. Easy to adjust set point indicators are controlled by knobs located on the gage face (accessible opening case after de-energizing instrument). All models provide both low and high limit control. Compatible with air and other non-combustible, non-corrosive gases, they can be used in systems with pressures to 25 psig (1.725 bar). Optional construction is available for use to either 35 psig (2.42 bar) or 80 psig (5.51 bar). Flame-proof ATEX enclosures are available with glass window which allows for viewing of set point needles and process pressure.
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1900 Compact Low Differential Pressure Switches

1900 Compact Low Differential Pressure Switches
  • Product Applications Clogged filter detection, Air conditioning refrigeration coil icing detection; defrost cycle intiation, Variable air volume controller Etc.
Our most popular series combines advanced design and precision construction to make these switches able to perform many of the tasks of larger, costlier units. Designed for air conditioning service, they also serve many fluidics, refrigeration, oven and dryer applications. For air and non-combustible compatible gases, Series 1900 switches have set points from 0.07 to 20" w.c. (1.8 to 508 mm). Set point adjustment is easy with range screw located inside conduit enclosure. Internal location helps prevent tampering. UL, CE and CSA listed, and FM approved. CAUTION: FOR USE ONLY WITH AIR OR COMPATIBLE GASES.
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Series 1630 Large Diaphragm Pressure Switches

Series 1630 Large Diaphragm Pressure Switches
Our highest precision conventional large diaphragm pressure switch provides maximum dependability. In addition, it incorporates a visible set point indicator for maximum convenience. UL and CSA listed, FM approved for general service, these switches are suitable for most applications in air conditioning and industrial service. Electrical capability of 15 amps handles most small electrical loads. CAUTION: FOR USE ONLY WITH AIR OR COMPATIBLE GASES.
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