Honeywell ST 3000 Specification And Model Selection Manual page 14

34-ST-03-64
Page 14
1440 1440
1200 1200
Loop Loop
Resistance Resistance
(ohms) (ohms)
Figure 16—Supply voltage/loop resistance chart.
H2
Fixed
ref. leg
NOTE: Lower flange seal should not be mounted over 22 feet below or above
the transmitter for silicone fill fluid (11 feet for CTFE fill fluid) with tank at one
atmosphere. The combination of tank vacuum and high pressure capillary
head effect should not exceed 9 psi vacuum (300 mmHg absolute).
Consult Honeywell for installation of STR13D.
Figure 17—The ST 3000 transmitter with remote diaphragm seals shown mounted on a tank.
800 800
650 650
450 450
250 250
0 0 10.8 10.8 16.28 20.63 25 16.28 20.63 25
Operating Voltage (Vdc) Operating Voltage (Vdc)
Note: A minimum of 250 ohms Note: A minimum of 250 ohms
of loop resistance is necessary of loop resistance is necessary
to support communications. to support communications.
Loop resistance equals barrier Loop resistance equals barrier
resistance plus wire resistance resistance plus wire resistance
plus receiver resistance. plus receiver resistance.
= Operating Area = Operating Area
28.3 28.3 37.0 37.0 42.4 42.4
LP Side
Maximum level
Minimum level
.
HP Side
Variable
Head
H1
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