Maintenance and Troubleshooting
Yamatake Corporation
7-4
ST3000 Smart Transmitter Series 900 Electronic Differential Pressure/Pressure Transmitter
7-1-4 :Zero Adjustment Based on Actual Level (with SFC)
When a differential pressure transmitter is used as a level gauge, the zero point can be
adjusted by either one of two methods. In both cases, adjust the zero point by changing
the LRV and the URV. Refer to 2. Setting the set range (LRV/URV) based on the cur-
rent input value in 7.1.1 Overview. The factory set zero point calibration data is not
rewritten.
Procedure 1
• Set the LRV by setting the current input value for 0%
• Maintain same liquid level for which 0% is the output. Set the zero point based on
this input value.
Example: Current input value=0.025 kPa, LRV=0 kPa, URV=10 kPa
The result of the key-pad operation will be, as follows:
LRV=0.025 kPa, URV=10.025 kPa
Key-pad operations:
Procedure 2
• Set the LRV by setting the current input value for the specified value
Example: When the transmitter output is 35%, it can be adjusted to the current liquid
level (e.g. 40%) obtained with a level gauge, using these key-pad operations.
LRV=0 kPa, URV=10 kPa are changed to LRV=0.5 kPa, URV=10.5 kPa
Key-pad operations:
20mA
4mA
10kPa
0
LRV E
0%
G
SET
ENTER
( Yes )
NON-VOL
20mA
4mA
10kPa
0
OUT- J
PUT
INPUT
R
4
Z
0
ACT PR
G
SET
ENTER
( Yes )
NON-VOL