6/08 ST 3000 Release 300 and SFC Model STS103 User’s Manual 137
7.7 Liquid Level Measurement - Pressurized Tank, Continued

Procedure, continued

Table 42 Starting Up DP Transmitter for Liquid Level Measurement in Pressurized Tank

Step Press Key Read Display or Action Description

1 Connect SFC across loop wiring and
turn it on. If possible, locate SFC where
you can also view receiver instrument in
loop. If you want to verify transmitter
output, connect a precision milliammeter
or voltmeter in loop to compare
readings.
See Figure 38 for sample SFC and
meter connections in a typical
analog loop with a differential
pressure type transmitter.
2 Close block-off valves A and B. See Figure 42 for sample piping
arrangement.
3 Open plugs C and D. Allow system to stabilize at head
pressure.
4 DE READ
A
ID
TA ON.G
?TRIPS SECURED?
Be sure any switches that may trip
alarms or interlocks associated with
analog loop are secured or turned
off.
5 NON-VOL
ENTER
(Yes)
TA ON.G
SFC WORKING.. .
LIN AG NO.DP T
PT3Ø11
Confirm that “TRIPS” are secured
and establish communications with
sample transmitter PT 3011
6 E
LRV
0%
SET
G
NON-VOL
ENTER
(Yes)
PTLRV 3Ø111
Ø. ØØØØ "H2O
_39F
PTLRV
RV
1 1
L
1
?SET
PTLRV 3Ø111
1.Ø5 32 "H2O
_39F
Read present LRV setting.
Prompt asks if you want to set LRV
to applied pressure.
LRV is set to applied head pressure
H1 times density of liquid in
reference leg.
7 INPUTJ
OUT-
PUT
PTOU T 3Ø1 11P
FC WOSING.RK . .
%
PTOU T 3Ø1 11P
ØØØ
Call up output for display.
Read 0% output on display for
corresponding empty tank pressure
plus head pressure H1. For analog
transmission, check that
milliammeter reading is 4 mA (0%)
output.
Continued on next page