Mid-West Instrument
Made in the USA
Tel: (586) 254-6500 · Fax: (586) 254-6509
6500 Dobry Dr., Sterling Heights, Michigan 48314
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Differential Pressure Daphragm - Type Gauge / Switch - Model 140/141/142 Differential Pressure Daphragm - Type Gauge / Switch - Model 140/141/142
Model 140/141/142
Model 140/141/142
Literature Links

Product Bulletin Bul140.pdf
 Product Bulletin Bul142.pdf

Installation/Operation

IM140.pdf
IM142.pdf
IM140elec.pdf
IM142elec.pdf

Instrument Installation
Recommendations

Install.pdf
 Typical Manifold Installation

Special Notice About Chemical Seals

chemical_seals.pdf

The Mid-West Advantage:
Model 140/142

Functions and Applications:

The Division 2 rated product is a lower cost alternative when compared to the Explosion-Proof designs that are often used in Division 2 applications. Mid-West Instrument's Models 140/142 are CSA Certified to both the Canadian and U.S. standards and U.L. Listed to the U.S. Standards. In addition the Model 140 indicating differential pressure switch is CE marked to the Low Voltage Directive.

Mid-West Instrument’s “Delta P” switches utilize reed switch technology. Reed switches can provide switching control from low power loads (PLC’s) to small inductive loads such as relays & small solenoids. With proper switch protection, over 1,000,000 cycles can be realized.

Product Features

  • DP Ranges from 0-20" WC to 0-100 PSID
  • Elastomer Diaphragm Sensing Element, No Cross Port Leakage
  • Up to 3000 PSIG Working Pressure (200 bar)
  • Over-Range Protection, High over Low and Low over High
  • Gauge Housings Evailable in Aluminum, Brass, Stainless Steel and Acetal Plastic
  • Wide Range of Elastomers
Certifications: 
  • CSA Certified, UL Listed, Class I, Division 2, Groups A, B, C, D;
    Class II, Division 2, Groups F & G.

Switch Options:

Type
SPST
SPDT
Option:
B
A
*Power
25W
3W
Max. Current
0.5  Amps
0.25 Amps

Max. Voltage VAC/VDC
240
125

Setting (%F.S.)
25 to 95
10 to 90

Hysteresis (Max/Nom)
15%/8% (F.S.)
10%/5% (F.S.)
Repeatability
1% F.S.
1% F.S.
  • Set Point Accuracy: 2%
  • Interface:  1/2” Conduit Entry with 7 Position Terminal Strip
  • Enclosure:  NEMA 4X / Type 4 switch enclosure classification.
  • Switch Adjust: External Access
  • Input Power: None.  (Switches do not need input power to operate)

Body:

  • Working Pressure:  140 - 3000 P.S.I.G. (200 bar); 142 - 1500 (100 bar)
  • Differential Over-range:  140 - 3000 PSID (200 bar); 142 – 1500 PSID (100 bar)
  • Range: 0-20" H2O to 0 -100 PSID (0-50 mbar to 0-7 bar)
  • High Side to Low side Isolation:  Isolated (Diaphragm Style)
  • Process Connections: 1/4” FNPT Back (Standard)
  • Materials:  AL, 316 / 316L  SS,  Brass

Indicator:

  • Accuracy:  2%
  • Dial Size:  None (Switch Only), 2 1/2” (Standard), 3 1/2”, or 4 1/2”
  • Readings:  Uni-directional , Bi-Directional

Model 140 Div I information
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*(ASME B 40.100 Accuracy Grade B)