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Precision Loop Calibrator
Valve Tests (710)
35
Signature Test
In the Signature Test, the product sources a ramping 4 mA to
20 mA to 4 mA signal and records the pressure applied to the
actuator from the positioner and the position.
To set up:
1. Go to Signature Test Menu. See Figure 52.
Figure 52. Signature Test Setup
2. Push the knob to move the cursor through the options.
3. Confirm the Ramp Time, change if needed.
4. Change the Tolerance as required from 1 % to 20 %.
5. In the Calibrator Setup Menu, select Test Tolerance > Valve
Test Parameters to set the default test tolerances.
6. Change the size of steps as required from 0.1 mA to 4.0 mA.
To run the test:
1. Push to start the test.
The Product varies the 4 to 20 mA signal, monitors the TV and
QV variables (pressure and position), and compares it to
expected values.
• Good test result: the position variable is as expected.
• Marginal test result: the position variable value is found to
be close to the test tolerance.
• Bad test result: the position variable deviation values vary
greater than the tolerance.
2. Select Save to save the test results and upload later to the
ValveTrack software.
Or, select Discard if you do not want to save the test result.
Manual Test
Select Manual Test to see the mA signal applied and HART
variables. See Figure 53.
Figure 53. Manual Test
The HART variables that show on the display are important
information about the operation of the valve.
HART variable mapping:
PV: Digitized mA value that represents the mA value applied to the
valve.
Note
This value should agree closely with the applied mA
value.
SV: Setpoint where the valve is expected to be at in % of travel.
Valves forward acting are configured to Fail Open (FO) as the 4 to
20 mA signal moves the valve from 0 % to 100 % of travel (from
open to closed) with 4 to 20 mA signals applied. If the valve is
configured as FC and is forward acting, the valve opens as the
applied mA signal increases to 20 mA.
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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