Cla-Val 350-07/3650-07 - Manual (Page 24)

In some applications it may not be physically possible to reach the low pressure point due to not being able to lower pressure
in a zone. Projection calibration mode is an ideal solution for this situation.
1) Look at pressure gauge or flow sensor and use Increase actuator or Decrease actuator until LOW pressure point is
reached. Press the Stop actuator button. Use good quality gauges and be as precise as possible. If calibrating CDHS-32
for flow rate using an orifice plate, a calibrated differential pressure gauge or transmitter is recommended. Once high
pressure or flow is reached and actuator stopped, click on high point setting button.
2) Look at the pressure gauge or flow sensor and use Increase actuator or Decrease actuator buttons to decrease pressure
or flow as close as practical to desired LOW pressure point.
3) Enter this value in the projected Low point calibration window.
4) Next click on Low point setting button, and then click on Download calibration button. The actuator automatically projects
range to desired low point value entered in Configuration tab window.
5) New projected Low point, High point, Loss-of-Signal, and Rotation speed settings are sent to actuator. Actuator LED will
change to green when complete. Unplug cable from actuator and replace protection cap, actuator is now ready to accept
4 - 20 mA command signal from permanent cable Yellow and Black wires.
If it is not practical to reach both high and low system value settings, then both projection procedures can be used. Allow
at least one fourth of total range between high and low starting points. Accuracy of projected values is based on
accuracy of initial value and any error will be magnified when projected from starting point.
Calibration - Projection to New LOW Value Point
Fig. 4
Page 6
Projected Low Calibration