Pulsafeeder MPC - Manual (Page 32)

Each can be set as normally OPEN or normally CLOSED. For example,
if an output is set to ON/OFF INDICATION and NORMALLY CLOSED,
this means that when the motor is running (indicator lamp is ON) the
output will be CLOSED. A NORMALLY OPEN setup will give the
opposite response.
Digital output circuits are transistor based and limited to 40 VDC
maximum, see Section 8.4.8 - Control Input/Output Signal Wiring,
and Specifications Section, for more information.
10.5 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.
10.5.1 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