3
Maximum Inlet
Pressure, psig
Fixed Factor billing
1
1
⁄4”
30
o
15
15
15
-
-
-
-
-
-
1
1
⁄4”, 243-12
1
1
⁄2”, 243-12
2”, 243-12
1
1
⁄4”, 243-8
1
1
⁄2”, 243-8
2”, 243-8
1
1
⁄4”, 243-8HP
1
1
⁄2”, 243-8HP
2”, 243-8HP
*1
1
⁄4”
10
o
25
25
25
-
-
-
-
-
-
1”
30
o
25
25
25
-
25
25
-
25
25
1
⁄2”
10
o
100
100
100
80
80
80
80
80
80
3
⁄8”
10
o
125
125
125
100
100
100
100
100
1
⁄4”
10
o
125
125
125
125
125
125
125
125
125
.207”
10
o
-
-
-
125
125
-
-
-
-
*1”
10
o
40
40
40
-
-
-
-
-
-
3
⁄4”
30
o
-
-
40
-
-
40
-
-
-
3
⁄4”
10
o
60
60
60
40
40
40
40
40
*External Control Regulator Only
Regulator
Model
and Size
Regulator accuracy is essen-
tial to measurement accuracy,
and because the 243 is so
precise, it is ideal for Pres-
sure-Factor Measurement,
Pressure Compensated
Metering, Fixed Factor Billing,
etc.
The table below gives the
pressure accuracies obtain-
able with 243-12 and 243-8
regulators at the capacities in
the tables on pages 8 to 19.
The 243 will hold outlet pres-
sure within the indicated per-
centage limits from set flow
(250 scfh) to the flows given in
the capacity tables. Percent-
ages are all based on
absolute pressure using 14.4
psia as atmospheric.
As an example, referring to
page 10, a 1
1
⁄2” Model 243-12-
2 with 1” orifice, 30
o
, valve, 15
psig inlet and 11” w.c. set-
point (green spring) at 2” w.c.
droop has a gas capacity of
9800 scfh. Per the below
table, this regulator at these
conditions will hold outlet
pressure at 11” w.c. =
1
⁄2% (2”
w.c.) from 250 to 9800 scfh
(based on absolute pressure).
For higher outlet pressures,
greater capacities, increased
accuracies, and excessive
inlet pressure variations, use
the 243-RPC pilot operated
regulator (see page 7).
Set Point
6” w.c.
7” w.c.
11” w.c.
18” w
.c.
1psi
1psi
2psi
3psi
3psi
Droop
1” w.c.
1” w.c.
2” w.c.
3” w
.c.
0.3 psi
0.2 psi
0.6 psi
0.3 psi
0.6 psi
Accuracy
+
1
⁄2% and -
1
⁄2%
+
1
⁄2% and -
1
⁄2%
+
1
⁄2% and -
1
⁄2%
+ 1% and -1%
+ 1% and -2%
+ 1% and -1
1
⁄2%
+ 1% and -4%
+ 1% and -2%
+ 1% and -3
1
⁄2%
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