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Page EN-10 SITRANS LR 200 – QUICK START MANUAL 7ML19985QL81
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English
Using P837 and P838 (perform this function at low tank levels)
If SITRANS LR 200 displays an incorrect full level, or if the reading fluctuates between a false
high level and a correct level, use P838 and P837 together to elevate the TVT (Time Varying
Threshold) in this region and de-sensitize the receiver from any ‘base noise’ caused by internal
antenna reflections, nozzle echoes, or other vessel false echoes.
a. First rotate the instrument for best signal (lowest false echo amplitude)
b. Determine the distance from the reference point to the material level.
c. Select P838 and key in [distance to liquid level – 0.5m].
d. Select P837, then press 2 (Learn) and ENTER . P837 will automatically revert to 1
(use Learned TVT) after a few seconds.
9. Return to RUN
Press PROGRAM
to return to RUN mode: setup is complete.
SITRANS LR 200 Communications: HART
• You will need the full manual to acquire the list of applicable parameters.
• The HART Device Descriptor (DD) may be obtained from the HART Communication
Foundation at www.hartcomm.org
• We recommend that you use Simatic Process Device Manager (PDM) to program
your instrument.
Maintenance
SITRANS LR 200 requires no maintenance or cleaning under normal operating conditions. If
cleaning becomes necessary under severe operating conditions:
1. Note the antenna material and the process medium, and select a cleaning solution
that will not react adversely with either.
2. Remove the instrument from service and wipe the antenna clean using a cloth and
suitable cleaning solution.
Notes:
• Use this function only if there is a minimum distance of 2 meters from SITRANS LR 200 to
the material.
• Set P837 and P838 during start up, if possible.
• If the vessel contains an agitator, the agitator should be running.
Note: See
mA Output with Level, Space, and Distance operation
on page 8 for an illustration
of the mA output with different modes of operation.
LR-200QS-EN.fm Page 10 Wednesday, March 12, 2003 3:51 PM
cross-referenced