Pentair POINT FOUR RIU3 Guía De Instalación Y Del Usuario página 20

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b. Temperature Calibration
The temperature channel is factory calibrated and in general, should never need to be re-calibrated. A 1-point
calibration may be completed to ensure consistent readings between different probes. A 2-point calibration
may also be completed; however, this can be time consuming and will typically not be as accurate as the
existing factory calibration.
To complete a 1-point temperature calibration for this probe, do the following:
i. Ensure the probe temperature has stabilized in the measurement sample for at least 30 minutes. Also
ensure the reading of a reference temperature sensor in the same sample has stabilized.
ii. On the RIU3, press and hold the Return button for 3 seconds to enter the configuration menu.
iii. Using the Down button, scroll down to the Cal menu and click the Enter button.
iv. Scroll to "Temp" and click the Enter button.
v. Scroll to "1-point" and click the Enter button.
vi. The current value of the degC PV will be displayed. You will want to change this to match the value
of the reference temperature sensor. Use the Up and Down buttons and the Enter button to do this.
vii. Once you have entered the temperature value and clicked the Enter button once more, the RIU3 will
attempt to capture the calibration point and calculate the Offset. If the probe reading is stable and
within reasonable limits, the calibration point will be captured and a Cal OK message will be displayed.
viii. Use the Return button to return back to the main display. The degC PV should now read the same as
the reference temperature sensor.
To complete a 2-point temperature calibration for this probe, do the following:
i. Choose 2 calibration temperatures that cover the expected range of measurement temperatures. For
example, if the sample temperature is expected to vary between 5 and 15 °C, choose calibration points
5 and 15 °C. 0 and 20 °C would also work.
ii. Create a sample with water at the temperature of the first calibration point. For example, if the first
calibration point is 0 °C, an ice bath can be used. Place the probe in the sample and allow the
temperature to stabilize for at least 30 minutes.
iii. On the RIU3, press and hold the Return button for 3 seconds to enter the configuration menu.
iv. Using the Down button, scroll down to the Cal menu and click the Enter button.
v. Scroll to "Temp" and click the Enter button.
vi. Scroll to "2-point" and click the Enter button.
vii. The current value of the degC PV will be displayed. You will want to change this to match the value of
the first calibration sample. Use the Up and Down buttons and the Enter button to do this.
viii. Once you have entered the temperature value and clicked the Enter button once more, the RIU3
will attempt to capture the calibration. If the probe reading is stable and within reasonable limits, the
calibration point will be captured.
ix. Create a sample with water at the temperature of the second calibration point. For example, if your
second calibration point must be around 20 °C, room temperature water can be used with a reference
temperature sensor to measure the actual water temperature. Place the probe in the sample and allow
the temperature to stabilize for at least 30 minutes.
x. On the RIU3, the second calibration point should be displayed. You will want to change this to match
the value of the second calibration sample. Use the Up and Down buttons and the Enter button to do
this.
xi. Once you have entered the temperature value and clicked the Enter button once more, the RIU3
will attempt to capture the calibration. If the probe reading is stable and within reasonable limits, the
calibration point will be captured. The new Slope and Offset values will be calculated and a Cal OK
message will be displayed.
xii. Use the Return button to return back to the main display. The degC PV should now read the same as
the reference temperature sensor.
POINT FOUR™ RIU3™ Remote Monitor/Controller Installation and User's
Guide