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Mercoid Controls produces a broad range of pressure, temperature, and level controls for use in heavy industrial, petrochemical, and electrical utility plants. Established in 1916, Mercoid has been serving industry for over 80 years. Our joining with Dwyer Instruments, Inc., combines over 150 years of experience to produce an even stronger and more resourceful company to serve your instrumentation and control needs. We have over 3,000 products from Dwyer, Mercoid, W.E. Anderson, Proximity and Love Controls including the Mercoid DA Series.


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Switches  Gauges  Transmitters


Adjustable Pressure Switches - Series APS/AVS
Vacuum and Pressure Ranges, 5A Switch, Compact Size

Bourdon Tube Pressure Switches - Series DA/DS
Visible Setpoint, Adjustable Deadband, Pressure Ranges to 5000 psi

Bourdon Tube Pressure Switches - Over-Pressure Diaphragm Controls - Series D-900

Bourdon Tube Differential Pressure Switches - Series BB
Stainless Steel Bourdon Tubes, Adjustable Deadband, Pressure Ranges to 8000 psig, Optional Explosion-proof Enclosure
Diaphragm Operated Pressure Switches - Series SA1100
Visible Setpoint, Adjustable Deadband, Hermetically Sealed Snap Switch, Weatherproof and Explosion-proof
Diaphragm Operated Pressure Switches - Series AP
Visible Setpoint Adjustment, Compact, Low Cost, Snap Action Switch, Optional Weatherproof or Explosion-proof Housings
Differential Pressure Switches - Series A4
Adjustable Set Point, High Overpressure
Double Bellows Differential Pressure Switches - Series DP
Visible Setpoints, Adjustable or Fixed Deadband, High Pressure Ranges
Dual-Action Explosion-proof Pressure Switches - Series H2
Explosion-proof and Weatherproof Housing
Electronic Pressure Switches - Series ES
Adjustable Set Point, Local Indication, NEMA-4 Enclosure


Diaphragm Operated Pressure Switches - Series 1000E/Series1000W
Visible Setpoint, Fixed Deadband, Pressure Ranges to 1400 psi, Over Pressure Protection to 3000 psi
Explosion-Proof Differential Pressure Switches - Series 1950
Compact, Low Cost, Explosion-proof and Weatherproof
Explosion-Proof Differential Pressure Switches Model 1950G
Explosion-proof, Weatherproof, Compatible with Natural Gases
Explosion-proof Differential Pressure Switches - Series H3
Setpoints from 10" w.c. to 200 psid, rated 1500 psig, Weatherproof
Gas Pressure/Differential Pressure Switches - Series PG
External Adjustment, Visible Dial, Hermetically Sealed Snap Switch
Low Cost Diaphragm Operated Pressure Switches - Series CS/CD
Adjustable Setpoints, Fixed Deadband, Snap Action Switch
Low Cost Pressure Switches - Series A1S & A1B
316 SS or Buna-N Diaphragm, Optional Weatherproof Enclosure, Ranges from 3-20 to 50-500 psig


Capsuhelic® Differential Pressure Gages - Series 4000
Measures Pressure, Vacuum or Differential, Suitable for Internal Pressures to 500 psig
Digital Pressure Gages - Series DPG-000
±0.5% Full Scale Accuracy, NEMA 4X Housing
Digital Pressure Gages - Series DPG-100
±0.25% Full Scale Accuracy, NEMA 4X Housing
Pressure Gages - Series 760
4-1/2" Dial, Liquid Filled, ±0.5% Full Scale Accuracy
Process Pressure Gages - Series 761
Liquid-Fillable, ±0.5% Full Scale Accuracy
Process Pressure Gages - Series 762
Glycerin Filled, ±1% Full Scale Accuracy
Spirahelic® Direct Drive Pressure Gages - Series 7000
Panel Mount, 4-1/2", 6", & 8-1/2" Dials, ASME Grades 2A, or 3A
Spirahelic® Direct Drive Pressure Gages - Series 7000B
4-1/2" Turret Mount Gage, ASME A & 2A
Spirahelic® Pressure Gages - Series 6000
Reliability and Accuracy in a 2-1/2" Solid-front Gage


Adjustable Range Pressure Transmitters - Series 637
Stainless Steel, Intrinsically Safe, Explosion-proof, Accuracy ±0.25%, 4-20 mA Signal
Fixed Range Pressure Transmitters - Series 636D
Explosion-proof, 0.5% Accuracy
Fixed Range Pressure Transmitters - Series 636
Stainless Steel, Explosion-proof, Accuracy ±.30%, 4-20 mA or 1-5 VDC Signal
Industrial Pressure Transmitters - Series 626 & 628
Complete Offering of Ranges, Connections and Outputs
Pressure Transmitters - Series 673
±0.25% Full Span Accuracy, 4-20 mA Signal, Ranges to 1000 psi


Sanitary Pressure Transmitters - Series 637S
Meets NACE and 3A Sanitary Standards, Accuracy ±0.25%
Sanitary Pressure Transmitters - Series 681
Meets 3A Sanitary Standards, No Liquid Fill Diaphragm, Tri-Clover Fitting
Weatherproof Pressure Transmitters - Series 679
±0.25% FS Accuracy, Compatible with Corrosive Materials, 4-20 mA Output
Wet/Wet Differential Pressure Transmitters - Series 629
0.5% Accuracy, NEMA 4X Enclosure
Wet/Wet Differential Pressure Transmitters - Series 645
Low Range, 0.5" w.c., High Maximum Working Pressure


Wet/Wet Differential Pressure Transmitters - Series 647
Ranges from 0 to 1" w.c., ±1.0% Accuracy, NEMA 4 Enclosure, 2-wire
Wet/Wet Differential Pressure Transmitters - Series 655
±0.25% Accuracy, Quick Response, 2-Wire Design

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