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
Model 140
Literature Links

Product Bulletin Bulletin_140_12.pdf

Installation/Operation

IM140.pdf
Elec_IM140.pdf

Instrument Installation
Recommendations

Install.pdf
Typical Manifold Installation

Special Notice About Chemical Seals

chemical_seals.pdf

The Mid-West Advantage:

Model 140

Common Applications

  • Filter/Strainer Monitoring
  • Compressed Air, Hydraulic, Refrigerant
  • Pump Performance Testing
  • Heat Exchanger Pressure Drop Monitoring
  • Water Treatment Applications
  • Tank Level Monitoring
  • Horizontal or Vertical

Product Features

  • DP Ranges from 0-25 PSID 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 Bodies Available in Aluminum, Brass, Stainless Steel
  • Wide Range of Elastomers
Certifications:
  • CSA Certified, UL Listed, Class I, Division 1, Groups C, D;
    Class II, Division 1, Groups E,F, & G.

Switch Options:

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

Max. Voltage VAC/VDC

240
125

Setting (%F.S.)

15 to 90
15 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 Color Coded  24”, 18 Awg. Flying Leads
  • Enclosure: Aluminum NEMA 7 (Flame-proof), NEMA 4X optional (In addition to NEMA 7)
  • Switch Adjust: External Access to switch adjust internal to enclosure
  • Input Power: None.  (Switches do not need input power to operate)

Body:

  • Working Pressure:  3000 P.S.I.G. (200 bar)
  • Differential Over-range:  3000 PSID (200 bar)
  • Range: 0-25 PSID to 0- 100 PSID (0 – 1.7 bar to 0 – 7 bar)
  • High Side to Low side Isolation:  Isolated (Diaphragm Style)
  • Process Connections: 1/4” MNPT Bottom
  • 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

Model 140/142 Div II information