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SLN 700 SmartLine NCR Level Transmitter User’s Manual
Revision 1
6.2 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 Transmitter does not measure the given PV input or update the PV output while it
operates in the Output mode.
Constant Current Source Mode Procedure (Loop Test)
1.
Establish communication with the Transmitter. For these procedures, the values of components
in the current loop are not critical if they support reliable communication between the
Transmitter and the PC Host/Handheld Configurator
2.
On the Host visit Services Tab under Advanced Configuration menu.
3.
Select the
Loop Test
button; the
LOOP TEST
box will be displayed.
4.
Select the desired constant-level Output: 0%, 100%, or Other (any between 0% - 100%).
5.
Select the Set button. A box will be displayed asking Are you sure you want to place the
transmitter in output mode?
With the Transmitter in Analog mode, you can observe the output on an externally-
connected meter or on a local meter.
6.
Select the
Yes
button. Observe the output current at the percentage you selected in Step 5.
7.
Select
Yes
to continue. This concludes the Startup procedure
