Troubleshooting guide

16
8. Calibrations
8.1 Pump Flow Calibration
Your MPC is factory calibrated at rated flow and pressure. Nevertheless, you should always perform a
calibration with the MPC installed in your system. This will provide the most accurate flow display.
The only item required to calibrate your MPC is a means to measure the flow of the pump (i.e.,
calibration column, graduated cylinder, etc.). The most accurate calibration will be obtained by using a
measurement device installed on the suction side of the pump. Note that calibration values for liquid
volume will be in the user’s chosen units, either gallons or liters.
There are two methods for completing the flow calibration routine, either “Volume” or “Flow”.
Volume Method Calibration
The volume calibration is accomplished by running the pump at two different stroke length settings,
50% and 100%. During each run a volume of liquid will be pumped from the calibration column. This
volume is then entered into the MPC for calibration. Note that for this calibration, the actual volume of
liquid pumped is entered in gallons or liters. Do not enter a flow rate in gallons or liters per hour, as this
will not result in a valid calibration. The MPC display will guide the user through the steps for
calibration.
Please note that it must be safe to run the pump and dispense liquid into the system in order to complete
this calibration. The pump should be fully primed with the product in order to complete an accurate
calibration. Hydraulic diaphragm pumps must have a proper hydraulic prime as well.
Flow Method Calibration
The flow calibration is accomplished by entering values for flow that are already known to the user.
The MPC will request flow values in gallons or liters per hour for each of the two calibration points,
50% and 100% stroke length. This calibration is useful if operational circumstances do not permit the
pump to run for calibration. This calibration is also faster to complete if the flow values are already
known. The MPC display will guide the user through the steps for calibration.
The nameplate flow rating of the pump can be used to complete the flow calibration routine, however
there will always be some variance in the actual flow rate of a pump due to system conditions and
product characteristics. Using the pump’s nameplate rating will establish a baseline flow rate on the
MPC display, however it will not guarantee absolute accuracy.