Ametek IntelliPoint RF RNT Series, Assembly, Installation And Operating Instructions, Page: 19 / 90

Installation
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2.5.6 AutoVerify™
"AutoVerify" is a self-testing function that continuously checks the system for proper
operation when the unit is in the High Level Failsafe (HLFS) mode and in normal
condition.
• AutoVerify is field-selectable using a jumper located on the sensing element side of
the housing.
• On: If a fault is detected during the AutoVerify cycle, both LEDs will flash
alternately, and the current will go to the fault output of 5mA or 22mA.
• Off: The AutoVerify self-testing function is not active.
• The instrument is supplied with the AutoVerify jumper set in the off position.
The AutoVerify™ feature in The IntelliPoint™ switch is shipped DISABLED. For
critical High Level applications we recommend enabling the AutoVerify™ feature.
Nonvolatile Memory
The IntelliPoint has nonvolatile memory, allowing the unit to re-start after power
outages without recalibrating.
When unit is powered for the first time the internal microprocessor records and stores
the “Air” value. This is the uncovered value of the sensor mounted in the vessel. The
unit will also store the last covered value and the last uncovered value.
Whenever the unit is powered it uses these values as a reference point to determine
its current condition (normal or alarm).
The nonvolatile memory will retain the recorded values even if power is lost for months.
When the unit regains power, the microprocessor compares the stored values to the
current measured value. Then determines its current status.
AutoVerify Criteria
1. AutoVerify feature must be enabled.
2. In order for the IntelliPoint to correctly detect a disconnected sensor the active
sensor length (active length = insertion length – cote shield length) must be greater
than 24 inches (610 mm).
3. Consult Factory for specialty sensors that may be available for shorter length
requirements.
4. Sensors that do not meet the above requirement can perform reliably for level
measurement detection, and will pass AutoVerify / Manual Certify tests, but will
not be able to detect a sensor that is, or has become, electrically disconnected from
the transmitter.
Do not push the "ReCal" Button without first ensuring the Intellipoint is properly
installed and is below the sensing element.
If reset is unsuccessful a red LED will flash
.
The system is now ready for installation.
2.5.7 Re-Calibration