Emerson Rosemount 1199, Reference Manual

Page: 85 / 104

4.2.4 Closed tank example (non-zero based lower range value)
Note
For F
OUNDATION
™
Fieldbus, refer to the AI Function Blocks in reference manual.
Figure 4-12: Tuned-System
Procedure
1. Set seals at the same elevation for bench pressure verification, if required to range
transmitter. If the transmitter does not require bench pressure verification, proceed
to
Step 2 .
Bench pressure verification
Power and range the transmitter using a Field Communicator to the required tank
span. (
Figure 4-12 example) With the required calibration fixture attached to the
seal assemble apply pressure.
4 mA = 0 inH
2
O
20 mA = 81 inH
2
O
2. Install the tuned system by assembling the seals to the process taps. Common
practice is to mount the high-pressure side seal to the low process tap and the low-
pressure side seal to the high process tap.
3. Wire and apply power to the transmitter.
4. If the transmitter has a zero button, see
Figure 4-13 and Figure 4-14 , push the Zero
button. This will automatically re-range the transmitter so the LRV (4 mA) will equal
the current applied pressure value and the URV (20 mA) will be adjusted to the
required calculated span.
Example 1: Re-range using transmitter zero button
Transmitter is ranged per Figure 4-12 :
Reference Manual Configuration
00809-0100-4002 May 2020
Rosemount DP Level 85