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 240 Hazardous Locations Differential Pressure Switch - Model 240
Model 240
The Model 240 carries global certifications from CSA, UL, and ATEX. The diaphragm isolated Differential Pressure Switch is CSA Certified to both the Canadian and U.S. Standards and U.L. Listed to the U.S. Standards. In addition, it is certified to the ATEX directive Ex d, IIB + H2  with an IP 65 rating.

Mid-West Instrument’s new Hazardous Locations “Delta P” switches are provided with a field wireable terminal strip. The terminal strip eliminates the need to add a costly explosion-proof junction box near the switch.  Multiple outputs are available ranging from low power reed switches to higher load switching relay outputs.

Features and Benefits
A competitively priced Indicating Differential Pressure Switch for use in measuring the pressure drop across filters, strainers, separators, valves, and pumps in Hazardous Locations.

  • Total Separation of High and Low Pressures Sides
  • Simple, Rugged, Compact Design
  • Working Pressure 1500 PSIG (103 bar)
  • Over-range Protection to Maximum Presssure
  • Captive Cover Screws
  • The Entire Assembly is Certified for Hazardous Locations
Model 240
Model 240

The Mid-West Advantage:
Certifications: 
  • CSA Certified, UL Listed, Class I, Division 1, Groups B, C, D;
    Class II, Division 1, Groups E,F, & G.
  • ATEX Certified, Ex d IIB + H2 Ex II 2GD IP65

Switch Options:

Type
SPST **
SPDT
SPDT
DPDT Relay
ELEC Spec.
A
A
A
B,C,D,E,F,G, H
Output Option Code
E (NO)
H
A
R
†Power
60 W
60 W
3W
N/A
Max. Current
3.0  Amps
1.0 Amps
0.25 Amps
10 Amps

Max. Voltage VAC/VDC
240
240
125
277 / 30

Setting (%F.S.)
15% to 100%
25% to 100%
15% to 90%
15% to 100%

Hysteresis (Max/Nom)
20% / 9% (F.S.)
25% / 18% (F.S.)
15% / 6% (F.S.)
20%/10% (F.S.)
Repeatability
1% F.S.
1% F.S.
1% F.S.
1% F.S.

† Product of the Switching Voltage & Current Shall Not Exceed the Power Rating
** Available Normally Open Only
  • Set Point Accuracy: 2%*
  • Interface:  1/2” Conduit / Cable Entry with 16 Position Terminal Strip
  • Enclosure:  NEMA 7 / Ex “d” (Flame-proof), IP65 Weatherproof rating
  • Switch Adjust: Internal to the Enclosure
  • Input Power: None. (For Reed switch Outputs) ; Required for Relay Output

Body:

  • Working Pressure:  1500 PSIG (100 bar)
  • Differential Over-range:  Same as Working Pressure
  • Range: 0-20" H2O (0-50 mbar) to 0-100 PSID (0-7 bar)
  • High Side to Low side Isolation:  Isolated (Diaphragm Style)
  • Process Connections: 1/4” FNPT End Connected (Standard)
  • Materials:  AL, 316 / 316L  SS,

Indicator:

*  ASME B40.100 Grade B