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Reference Manual
00809-0700-4530, Rev AA
Section 3: Commissioning
September 2013
Commissioning
Table 3-3. Solids measurement
3.3.1 Trim Near Zone (GWR transmitters)
The Rosemount 3300 and 5300 Series are equipped with a firmware functionality that
minimizes the Upper Transition Zone based on actual mounting conditions. Trimming means
that the measurement performance in the near zone is maintained even under these conditions
and prevents false echo indication. This may be the case, for example, when a single lead probe
is installed in a chamber or if there are disturbing obstacles in the near zone. As best practice in
power applications, where short chambers are often used, the Trim Near Zone (TNZ) function is
advised. This function is especially recommended together with remote housing. For the
Rosemount 3300 Series TNZ instructions, refer to the Rosemount 3300 Series Reference Manual
Section 6 "Service and Troubleshooting" (Document No. 00809-0100-4811).
NOTE:
The TNZ function should only be used for reducing impact from stationary disturbances. It is
not suitable for occasional disturbances. For firmware version 2.A2 (released April 2009) the
TNZ is not possible in combination with narrow nozzles, as defined below:
- 2 in. (50 mm) < Nozzle height < 12 in. (300 mm)
- Nozzle diameter < 2 in. (50 mm) for all single probes except 13 mm single rigid
- Nozzle diameter < 3 in. (75mm) for 13 mm single rigid
NOTE:
The TNZ function cannot be used with the Rosemount 5300 Series DVC option. The TNZ
function is automatically blocked in RRM when DVC is activated.
To activate the TNZ function, ensure that the tank or chamber is empty, or that the (upper)
product is not closer than 43 in. (1.1 m). Then execute the TNZ command:
RRM > Advanced > Near Zone > Trim Near Zone
See the Rosemount 5300 Series Reference Manual for details (Document No.
00809-0100-4530).
Function Rosemount Series
Trim Near Zone (TNZ) Rosemount 5300 Series
Upper Null Zone (UNZ) Rosemount 5300 Series
Rosemount 5600 Series
Probe End Projection (PEP) Rosemount 5300 Series
Configuration for process conditions Rosemount 5300 Series
Rosemount 5600 Series
Safety Instrumented Systems (SIS) Rosemount 5300 Series
(1)
(1) See the Rosemount 5300 Series Reference Manual (Document No. 00809-0100-4530).
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