Mid-West Instrument
Tel: (586) 254-6500 · Fax: (586) 254-6509
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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

IM140/141.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 140/141/142

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 140/141/142 are CSA Certified to both the Canadian and U.S. standards and U.L. Listed to the U.S. Standards. In addition the Model 140/141 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%* or 5%
  • 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:  140/141 - 3000 P.S.I.G. (200 bar); 142 - 1500 (100 bar)
  • Differential Over-range:  140/141 - 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%* or 5%
  • Dial Size:  None (Switch Only), 2 1/2” (Standard), 3 1/2”, or 4 1/2”
  • Readings:  Uni-directional , Bi-Directional

Model 140/141 Div I information
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*(ASME B 40.100 Accuracy Grade B)