Flow Calibration; Pressure Flow Station Calibration - Pressura RPM10 Operation And Service Manual

4. Select the SIGNAL MIN item and enter the minimum output signal of the transducer. In this
example, you would enter 0 V.
5. Select the SIGNAL MAX item and enter the maximum output signal of the transducer. In this
example, you would enter 10 V.
6. To zero the pressure transducer:
a. Mark the high pressure tubing going to the high port of the transducer.
b. Remove the tubing from the high and low ports of the transducer.
c. Enter the PRESSURE ZERO item on the PresSura monitor.
d. Reconnect tubing to the high and low ports of the pressure transducer, using the mark to
connect the high pressure tubing to the high port.

Flow Calibration

Flow can be measured using a Pressure Flow Station, Linear Flow Station, or Venturi valve with
feedback

Pressure Flow Station Calibration

NOTE: Flow stations are optional and may not be installed in your system.
1. Set DUCT AREA item to the duct area where the flow is measured.
2. To Zero the flow station:
a. Mark the high pressure tubing going to the high port of the transducer.
b. Remove the tubing from the high and low ports of the transducer.
c. Enter the Sensor Zero item on the PresSura monitor.
d. Reconnect tubing to the high and low ports of the pressure transducer, using the mark to
connect the high pressure tubing to the high port.
3. Enter the LOW CAL item to perform the low flow calibration submenu with the following
items:
VOLTAGE INPUT
UNCALIBRATED FLOW
ZERO VOLTAGE
CALIBRATED FLOW
a. Adjust the flow to its minimum 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 increase the flow until the VOLTAGE INPUT (pressure transducer output) shows
the first noticeable increase in voltage from the minimum flow. A general rule-of-thumb is
that the voltage change should occur with the damper between approximately 10% to
30% open.
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.
60
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
Part Two