Sterlco M2B+ Controller - Manual (Page 32)

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5-3 Using the Flow Monitor
The controller is set up to accept a pulsed or current input from a flow sensor. The controller
translates the pulse or current into either gpm (gallons per minute) or lpm (liters per minute).
If the flow sensor is of the pulsed variety, it is connected to block J1 on the main controller
board. For analog signal sensors, see Section Chapter 5: on page 29.
Use the following procedure to set up a pulsed flow sensor:
1. Press the Index button three times to access the Secure menu.
2. Press the Enter button.
3. Press the Index button until the display reads “Flow Monitor.”
4. Press the Enter button.
5. Use the Up or Down buttons to change the value to PUL for pulsed input.
6. Press the Enter button to accept the value.
7. Press the Index button one time to access the “Flow Constant B” parameter.
8. Press the Enter button.
9. Use the Up and Down buttons to change the offset of the displayed flow reading.
This value should be determined by using a certified sensor to determine the offset.
10. Press Enter to accept the value.
11. Press the Index button one time to access the “Flow Constant K” parameter.
12. Press the Enter button.
13. Use the Up and Down buttons to change the scaling factor to the K factor (pulses per
gallon) provided by the sensor manufacturer. If the K factor isn’t known, use the
GPM flow rate and frequency. (A factor = GPM/Hz, K factor = 60 sec./A factor)
14. Press the Enter button to accept the value.
15. Press the Alarm Silence button to return to Running mode.
At this point, the controller should display the flow as “FL=X.X.” The user can now set up as
many as two alarms that will annunciate when the flow drops below or rises above a set value.
Use the following procedure to set up the flow alarm:
1. Press the Index button one time to access the Primary menu.
2. Press the Enter button.
3. Press the Index button until the display reads “Flow Alarm Low” for a low flow
alarm or “Flow Alarm High” for a high flow alarm.
4. Press the Enter button.
5. Use the Up and Down buttons to change the value.
6. Press the Enter button to accept the value.
7. Press the Alarm Silence button to return to running mode.
Use the following procedure to change the units of the displayed flow:
1. Press the Index button two times to access the Secondary menu.
2. Press the Enter button.
3. Press the Index button until the display reads “Flow Display.”
4. Press the Enter button.
5. Use the Up and Down buttons to change the value between GPM and LPM.
6. Press the Enter button to accept the change.
7. Press the Alarm Silence button to return to Running mode.