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 Piston Type Gauge & Switches - Model 120
Model 120
Model 120 AA front
Model 120 EA back
Literature Links

Product Bulletin bulletin_120_11.pdf

Installation/Operation

IM120.pdf
IM120elec.pdf
install.pdf
Typical Manifold Installation

The Mid-West Advantage:

Switch Configuration - Model 120
Common Applications
  • Filter/Strainer Monitoring
  • Compressed Air
  • Hydraulic
  • Refrigerant
  • Pump Performance Testing
  • Heat Exchanger Pressure Drop Monitoring

Product Features
  • 1 to 2 independently adjustable switches
  • Hermetically Sealed Switches
  • SPDT, SPST Normally Open, & SPST Normally Closed Configurations
  • Most configurations CE marked to the Low Voltage Directive (EN 61010)
  • Power Ratings ranging from 3 Watts to 60 Watts (Great for upgrades to handle cable lengths beyond 70 ft.) (see Table Below)
  • Numerous enclosure configurations. (see Table Below)
  • DIN connector (New popular field wireable interface)
  • 5 Year warranty
  • Hazardous Locations approved assemblies available
Electrical Configuration Matrix (Model 120)
OPTION
INTERFACE
MARKINGS
ENVIRONMENTAL
COMMENTS
A,B
Flying Leads, 22 Awg,
CE (Low Voltage)
Weathertight
Economical Configuration
C,D
1/4" NPT, Flying Leads, 22 Awg,
CE (Low Voltage)
NEMA 4X
Most Economical NEMA 4X Configuration
E,F
1/2" Conduit, Flying Leads, 18 Awg.
CE (Low Voltage), CSA /UL Div 2
NEMA 4X
Great Option for Hazardous Locations
G.H
Terminal Strip, Access for Conduit Hub or Cable Grip
CE (Low Voltage)
NEMA 4X
Best Protection for Gauge and switch.  Entire product is enclosed in NEMA enclosure
L,M
Plug-In Connector DIN 43650
CE(Low Voltage)
NEMA 4X Connector (IP65)
Connector CSA/UL approved for general purpose wiring.  Field Wireable. Very popular option.
J,K
1/2" Conduit, Flying Leads, 18 Awg
CSA / UL  Class I, Division I, Groups C & D, Class II, Divison I, Groups E,F & G
NEMA 7, with optional NEMA 4X
Explosion-proof design. Externally adjustable switch set points.

REED SWITCH RATINGS (Resistive Load)

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 22 Awg. (per switch)
(2),  24"
(3),  24"
(3), 24"
† Product of the switching voltage and current shall not exceed the power rating of the device.