Mid-West Instrument
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 Bul120.pdf

Installation/Operation

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

The Mid-West Advantage:
Model 120

Functions and Applications

The Model 120 piston style Differential Pressure Switch is  CSA Certified to both the Canadian and U.S. Standards and U.L. Listed to the U.S. Standards.  The entire assembly is Certified for use in Class I, Division 1, Groups C, D; Class II, Division 1, Groups E, F, & G Hazardous locations.  The entire gauge and the switch is enclosed in a rugged flameproof enclosure.  The use of reed switch technology eliminates the need for an additional explosion-proof seal fitting within 18” of the enclosure.

  • The Entire Assembly is Certified for Hazardous Locations
Specifications:
  • 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
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 os 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 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:  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” MNPT Bottom
  • Materials:  AL, 316 / 316L SS, Brass

Indicator:

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

*  ASME B40.100 Grade B

Model 120 Div II information