Linear Flow Station Calibration; Venturi With Feedback Calibration - Pressura RPM10 Operation And Service Manual

g. The low flow calibration is complete.
4. Enter the HIGH CAL item to perform the high flow calibration submenu with the following
items:
VOLTAGE INPUT
UNCALIBRATED FLOW
ZERO VOLTAGE
CALIBRATED FLOW
a. Adjust the flow to its maximum volume. Observe the VOLTAGE INPUT displayed on the
screen, or use a voltmeter to read the voltage at the pressure input terminals on the back
of the controller.
b. Slowly decrease the flow until the VOLTAGE INPUT (pressure transducer output) shows
the first noticeable decrease in voltage from the minimum flow.
c. For reference only, the UNCALIBRATED FLOW item will display the default measured
flow based on the current settings of the flow station (duct area, etc.).
d. Determine the actual flow with a duct traverse or other reference measurement.
e. Enter the actual flow measurement under the CALIBRATED FLOW menu item.
f. Press the Save key to save the flow data.
g. The high flow calibration is complete.
NOTE: Use Balance Flow to verify flow station calibration and adjust the K-FACTOR.

Linear Flow Station Calibration

NOTE: Flow stations are optional and may not be installed in your system.
1. Set DUCT AREA to the duct area at the linear flow station location.
2. Set SENSOR MAX to match the range of the linear flow station used.
3. Set SIGNAL MIN to match the minimum voltage output (0 to 10 V) of the linear flow
station used. This is typically 0 V.
4. Set SIGNAL MAX to match the maximum voltage output (0 to 10 V) of the linear flow
station used. This is typically 10 V.
5. Linear flow station calibration should be complete. Exit the menu.
NOTE: Use Balance Flow to verify flow station calibration and adjust the K-FACTOR.

Venturi with Feedback Calibration

NOTE: LOM Venturi Valves are optional and may not be installed in your system.
1. Obtain the venturi valve minimum and maximum flow, either by reading the label on the
venturi valve or by performing duct traverses when the venturi valve is fully closed and fully
opened.
2. Set MIN FLOW to the minimum venturi valve flow.
3. Set MAX FLOW to the maximum venturi valve flow.
4. Venturi with Feedback calibration is now complete. Exit the menu.
NOTE: Use Balance Flow to verify Venturi with Feedback calibration and adjust the
K-FACTOR.
Technical Section
Current voltage from pressure transducer
Current flow rate
Voltage from pressure transducer during Flow Station
Pressure Transducer Zero
Input actual flow as measured with reference instrument here
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