Made in the USA
Tel: (586) 254-6500 · Fax: (586) 254-6509
6500 Dobry Dr., Sterling Heights, Michigan 48314
Switch Configuration - Model 121
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
  • 3rd Party Certified Class I, Div 2, Groups A, B, C, & D; Class II, Div. 2, Groups F and G

Switch Specifications:

Electrical Configuration Matrix (Model 121)
OPTION
INTERFACE
MARKINGS
ENVIRONMENTAL
COMMENTS
A

1) Reed switch
In general purpose enclosure

CE (Pending)
(Low Voltage)

NEMA 4X/IP65 w/Terminal Strip 1/2" FNPT Conduit Connection

Economical Configuration
CE (Pending)

B

(2) Reed switches
In general purpose enclosure

CE (Pending)
(Low Voltage)
NEMA 4X/IP65 w/Terminal Strip 1/2" FNPT Conduit Connection
Economical Configuration
CE (Pending)
E

(1) Reed switch
In general purpose enclosure

CE, CSA, UL
Div II (Pending)
(Low Voltage)

NEMA 4X/IP65 w/Terminal Strip 1/2" FNPT Conduit Connection
Economical Configuration
CE (Pending)
F

(2) Reed switches
In general purpose enclosure

CE, CSA, UL
Div II (Pending)
(Low Voltage)
NEMA 4X/IP65 w/Terminal Strip 1/2" FNPT Conduit Connection
Economical Configuration
CE (Pending)
T
4-20 ma Transmitter
CE (Pending)
(Low Voltage)
NEMA 4X/IP65 w/Terminal Strip 1/2" FNPT Conduit Connection
Economical Configuration
CE (Pending)

REED SWITCH RATINGS (Resistive Load)

Type
SPST
SPDT
Option:
E, F, G
A
*Power
60 W
3 W
Max. Current
3.0 Amps
0.25 Amps
Max. Voltage VAC/VDC
240
125
Setting (%F.S.)
25 to 95
15 to 95
Hysteresis (Max/Nom)
18% / 10% (F.S.)
12% / 8% (F.S.)
Repeatability
1% F.S.
1% F.S.

* Product of the switching voltage and current shall not exceed the power rating of the device.

Literature Links

Product Bulletin Bulletin_121_11.pdf

Installation/Operation

IM120.pdf
IM120elec.pdf

Instrument Installation

Recommendations

install.pdf
Typical Manifold Installation

The Mid-West Advantage: