Honeywell ST 3000 User Manual page 99

Step
5 Press HOME to return to "Online" menu. Read applied input pressure (PV) which should be
zero.
Also read PV analog output which should be 4 mA to correspond with 0% output.
6 Optional (read output in % of range): From "Online" menu, step through the following menu
selections:
Device setup
•
• Process variables
At "Process variables" display, read 0% output for corresponding empty tank pressure plus
reference pressure H2. Check that milliammeter reading is 4 mA (0%) output.
7 • If you cannot fill tank, then go to Step 8.
If you can fill tank, then go Step 9.
•
8 Key in URV that is equal to full tank pressure. See Range Values in Section 6 for details on
keying in a range value.
Go to Step 12.
You can use these formulas to calculate URV in inH
EXAMPLE: If H1 equaled 10 feet, the measured liquid was water, and the LRV equaled –
135.36 inH
ATTENTION
The specific gravity of water at 60°F (15.6°C) is 1.00.
9 From "Online" menu (if applicable, press HOME to get there), step through the following menu
selections:
• Device setup
Diag/Service
•
• Calibration
• Apply values
You will be warned to remove the loop from automatic control. After doing so, press OK to
continue.
10/05
7— Start-up - Liquid Level Measurement with DP Transmitter with Remote Seals
Span = H1 x S
L
H1 = Height of variable head in inches.
S = Specific gravity of measured liquid.
L
URV = Span + LRV
O; substituting into the formulas yields:
2
Span = 10 ft x 12 in x 1.00
Span = 120 inH O
2
URV = 120 inH O + –135.36 inH
2
URV = –15.36 inH O
2
ST 3000 HART Transmitter Release 300 User Manual
Action
O.
2
O
2
85