Electrical Connections
Page 7
April 2017
VAM-UM-00646-EN-04
Reed Switch Configurations
Most units are equipped with an enclosure and a 15 ft (457 m) length of 4-wire #25 AWG
type, PVC jacketed cable with a 4-pin Hirschmann connector
Certain 1/4 in or SAE 6 meters with lower flow ranges are equipped with a strap housing
For safe operation of the reed switch, do not exceed the maximum wattage for that switch
For example, the normally open (NO) reed switch has a maximum power rating of 10
Watts If the switch is to operate at 24V DC, the maximum current is the wattage divided by
the voltage
I =
W
E
=
10
24
= 0.417A
Exceeding the maximum power rating for a particular switch will damage it
Reed Switch Cable Specifications
Single Switch (Strap Version): 2-Wire #24 AWG with Flying Leads
Color
Function
Wire Length
Yellow
Normally Open (NO)
400 in (10160 cm)
Green and Blue
Normally Closed (NC)
180 in (45720 mm)
Table 3: Reed switch (strap version) single switch specifications
Single or Dual Switch: 4-Wire #25 AWG, PVC Jacketed Cable with Hirschmann Connector
Color
Wire Assignment
Cable Length
Single Switch
Dual Switch
Red (Pin 1)
X
Switch 1
Decreasing Switch
15 ft (457 m)
Black (Pin 2)
X
Green (Pin 3)
Not Used
Switch 2
Increasing Switch
White (Pin 4)
Not Used
Table 4: Configuration of reed switch with enclosure
Wiring Configurations
Load turns ON when flow exceeds setpoint.
BLACK
Flow-Alert
WHITE
Po
w
er Line
Po
w
er Line
Load
Load turns OFF when flow exceeds setpoint.
RED
Flow-Alert
WHITE
Po
w
er Line
Po
w
er Line
Load
Figure 3: Loads within contact rating
BLACK
Flow-Alert
WHITE
R
1
Load
Relay
Coil
R1
Po
w
er Line
Po
w
er Line
Load turns ON when flow exceeds setpoint.
BLACK
Flow-Alert
WHITE
R
1
Load
Relay
Coil
R1
Po
w
er Line
Po
w
er Line
Load turns OFF when flow exceeds setpoint.
Figure 4: Loads outside contact rating
