Revision 8 SLG 700 SmartLine Level Transmitter User’s Manual Page 129
5.3 Procedures
Output Check Procedures
The Output Check has the following procedures:
The Loop Test procedure checks for continuity and the condition of components
in the output current loop.
The Trim DAC Current procedure calibrates the output of the Digital-to-Analog
converter for minimum (0%) and maximum (100%) values of 4 mA and 20 mA,
respectively. This procedure is used for Transmitters operating online in analog
mode to ensure proper operation with associated circuit components (for example,
wiring, power supply and, control equipment).
Precision test equipment (an ammeter or a voltmeter in parallel with precision
resistor) is required for the Trim DAC Current procedure.
The Apply Values procedure uses actual Process Variable (PV) input levels for
calibrating the range of a Transmitter. To measure a liquid level for example, a
sight-glass can be used to determine the minimum (0%) and maximum (100%)
level in a vessel. The PV is carefully adjusted to stable minimum and maximum
levels, and the Lower Range Limit Value (LRV) and Upper Range Limit Value
(URV) are then set by commands from the MC Toolkit.
The Transmitter does not measure the given PV input or update the PV output while
it operates in the Output mode.
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