Owner manual

Step Eight
WIRING
Step Nine
MAINTENANCE
General: The Switch-Pro™ flow switch requires no periodic
maintenance except to clean off any deposits or scaling from the sen-
sor tip as necessary. It is the responsibility of the user to determine
the appropriate maintenance schedule, based on the specific charac-
teristics of the application liquids.
Cleaning Procedure:
1. Power: Make Sure that all power to the sensor, controller and/or
power supply is completely disconnected.
2. Sensor Removal: Make sure that the flow is off and the pres-
sure is down prior to removing the Switch-Pro™. Carefully, remove
the sensor from the installation. Replace the sensor with a 3/4” NPT
plug to insure that liquid does not leak out during this procedure. Do
not re-install the Switch-Pro™ if the threads are damaged.
3. Cleaning the Sensor: Use a soft bristle brush and mild deter-
gent, carefully wash the Switch-Pro™ flow switch. Do not use
harsh abrasives such as steel wool or sandpaper, which might
damage the surface sensor. Do not use incompatible solvents
which may damage the sensor's PP/Ryton or PVDF plastic body.
4. Sensor Installation: Follow the appropriate steps of installa-
tion as outlined in the installation section of this manual.
Testing the Flow Switch:
Used to verify if the sensor is indicating a no-flow or flow condition.
This test uses all four-wires (Red, Black, White and Green). With Red
to Positive and Black to Negative, the Contacts (White and Green) will
be Open in a Flow Condition and Closed in a No-Flow Condition.
Also, the Red LED in the switch will ne OFF for a Flow Condition and
ON for a No-Flow Condition.
Red
Black
Shield
Ground
24 VDC
Power Supply
+
-
Multimeter
(Continuity)
-
+
White
Green
[Flow Condition]
Sensor
(NO)
RED
GRN
SHLD
WHT
BLK
LOAD
LOAD
OR
[+]
[-]
[Flow Condition]
Sensor
(NC)
BLK
GRN
SHLD
WHT
RED
LOAD
LOAD
OR
[+]
[-]
[Flow Condition]
Sensor
(NO)
RED
GRN
SHLD
WHT
BLK
LOAD
[AC Power]
[+]
[-]
[Flow Condition]
Sensor
(NC)
BLK
GRN
SHLD
WHT
RED
LOAD
[AC Power]
[+]
[-]
Wiring the Relay Output:
The Switch-Pro™ relay output can be wired as a dry contact to a VDC
or VAC power source. Switch-Pro™ does require 12 - 36 VDC power
to operate the sensor and switch the relay. All illustrations below
identify a Dry switch state as the normal position of the relay.
Switching a Normally Open DC Load:
The Red wire connects to Positive (+) of the power supply and the
Black wire connects to Negative (-). The LOAD can be attached to
either the Green or White wires. Complete the circuit by either con-
necting the Green to (+) VDC power or White to (-) VDC power (see
illustration below).
Switching a Normally Closed DC Load:
The Black wire connects to Positive (+) of the power supply and the
Red wire connects to Negative (-). The LOAD can be attached to
either the Green or White wires. Complete the circuit by either con-
necting the Green to (+) VDC power or White to (-) VDC power (see
illustration below).
Switching a Normally Open AC Load:
The Red wire connects to Positive (+) of the DC power supply and the
Black wire connects to Negative (-). The LOAD can be attached to
the Green wire and the Hot of the VAC power. Connect the White to
the Neutral of the VAC power (see illustration below).
Switching a Normally Closed AC Load:
The Black wire connects to Positive (+) of the DC power supply and
the Red wire connects to Negative (-). The LOAD can be attached to
the Green wire and the Hot of the VAC power. Connect the White to
the Neutral of the VAC power (see illustration below).