940-111E-004 Datasheet, PDF (5/8 Pages) Magnetrol International, Inc. – Echotel® Model 940/941

Use wrench on flats
Ensure gap is vertical by
turning wrench flats vertical
Gap must clear nozzle
Process
connection
Actuation point
Figure 3
Vertical Mounting
Front view
of gap
Tank wall
Figure 4
Horizontal Mounting
Figure 5
Nozzle Mounting
Green (GND)
Black (–)
Red (+)
Violet (NO)
Brown (NC)
Orange (COM)
Figure 6
Model 940
Green (GND)
Black (–)
Red (+)
Figure 7
Model 941
2.4 Wiring
2.4.1 Model 940 (Relay Output)
Wiring terminations for the Model 940 are shown in
Figure 6. The six wires coming out of the switch are
18 AWG. These wires should be connected to field wiring
that is 14 to 22 AWG.
Caution: Conduit should be installed onto the ³â„4" NPT connection
on the back of the unit. An approved seal drain fitting
should be used to prevent moisture from entering the
switch. All wiring, conduit, and electrical fittings must
conform to local electrical codes for the location selected.
Field wiring should be connected as follows:
1. Connect power wiring via the red (+) and black (-) wires.
2. Green wire should be connected to earth ground.
3. The SPDT relay is connected:
• Violet wire is NO
• Brown wire is NC
• Orange wire is COM
2.4.2 Model 941 (Current Shift Output)
Wiring terminations for the Model 941 are shown in
Figure 7. The three wires coming out of the switch are 18
AWG. These wires should be connected to field wiring
that is 14 to 22 AWG.
Caution: Conduit should be installed onto the ³â„4" NPT connection
on the back of the unit. An approved seal drain fitting
should be used to prevent moisture from entering the
switch. All wiring, conduit, and electrical fittings must
conform to local electrical codes for the location selected.
Field wiring should be connected as follows:
1. Connect power wiring via the red (+) and black (-) wires.
2. Green wire should be connected to earth ground.
51-647 Echotel Model 940 & 941 Ultrasonic Level Switches
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