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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Hazardous Locations Differential Pressure Switch - Model 120 Hazardous Locations Differential Pressure Switch - Model 120
Model 120
Literature Links

Product Bulletin Bulletin_120_11.pdf

Installation/Operation

IM120.pdf
IM120elec.pdf
Install.pdf
Typical Manifold Installation

The Mid-West Advantage:

Model 120

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 Model 120 is CSA Certified to both the Canadian and U.S. standards and U.L. Listed to the U.S. Standards.  In addition the Model 120 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. 

Specifications:
  • 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
SPDT
Option:
E ,F,G
H
A
†Power
60 W
60 W
3W
Max. Current
3.0  Amps
1.0 Amps
0.25 Amps

Max. Voltage VAC/VDC

240
240
125

Setting (%F.S.)

25 to 95
25 to 100
10 to 90

Hysteresis (Max/Nom)

15%/8% (F.S.)
20%/13% (F.S.)
10%/5% (F.S.)
Repeatability
1% F.S.
1% F.S.
1% F.S.
Leads 18 Awg. (per switch)
(2),  24”
(3),  24”
(3),  24”

† Product of the Switching Voltage & Current Shall Not Exceed the Power Rating

  • Set Point Accuracy: 2%*
  • Interface:  1/2" Conduit Entry with Color Coded  24", 18 Awg. Flying Leads
  • 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:  5000 PSIG (345 bar)
  • Differential Over-range:  5000 PSID (345 bar)
  • Range: 0-5 PSID (0-0.35 bar) to 0-100 PSID (0-7 bar)
  • 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"
  • Scales:  Uni-directional , Bi-Directional

*  ASME B40.100 Grade B

Model 120 Div I information