Blue-White F-2000 – Solvent Weld PVC Tee Fitting - Manual (Page 13)

F-2000 Page 13
Application 2. Proportional Chemical Feed Operation
In this operation, the relay is used to switch a device such as a valve or pump, that is being controlled by the flow
being measured.
Example: A chemical injection pump is turned on for a preset amount of time when the Programmed Batch
Amount is reached, thus injecting an amount of chemical per an amount of measured flow.
1. The chemical injection pump is wired to the normally open relay contacts.
2. The flow measurement begins.
3. The displayed Batch amount increases based on the flow rate being measured.
4. When the programmed Batch Amount is reached, the following occurs:
a. The external equipment timer begins.
b. The relay energizes turning on the chemical injection pump.
c. The Batch Amount Resets to zero.
d. The next batch flow rate measurement begins and the displayed Batch Amount increases.
e. When the External Equipment Timer cycle ends, the relay de-energizes turning off the chemical injection
pump.
5. The displayed Batch Number increments by one.
6. The batch is complete.
Note: The chemical pump may be stopped and re-started by pressing the clear setpoints button.
Application 3. Automatically Timed Batching Operation
In this operation, the relay is used to switch a device, such as a valve or pump, that is controlling the flow being
measured.
Example: A solenoid valve is wired to the normally closed contact of the F-2000 relay. In the de-energized relay
state, the valve is energized and open, which permits the flow being measured to flow. When the programmed
batch amount is reached, the relay is energized, opening the relay circuit which closes the valve, and a time delay
cycle begins. After the time delay cycle, the relay de-energizes which opens the solenoid valve and the next batch
begins.
1. The solenoid valve is wired to the normally closed contacts.
2. The flow measurement begins.
3. The displayed Batch Amount increases based on the flow rate being measured.
4. When the programmed Batch Amount is reached, the following occurs:
a. The time delay cycle (External Equipment Timer) begins.
b. The relay energizes closing the valve which stops the flow.
c. The batch amount resets to zero.
5. When the External Equipment Timer cycle ends, the relay de-energizes, opening the solenoid valve.
6. The displayed Batch Number increments by one.
7. The batch is complete.
CAUTION: WHEN WIRED TO THE NORMALLY CLOSED CONTACTS OF THE RELAY, EXTERNAL EQUIPMENT
WILL BE ENERGIZED IF THE CLEAR SETPOINTS BUTTON IS PRESSED. A SEPARATE
EMERGENCY SHUT-OFF SWITCH FOR EXTERNAL EQUIPMENT IS RECOMMENDED.