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L91
PROPORTIONING
PRESSURETROLCONTROLLERS
L91
PROPORTIONING PRESSURETROL CONTROLLERS ARE
SERIES 90 MODULATING PRESSURE CONTROLLERS THAT
PROVIDE DIRECT CONTROL OF MODULATING MOTORS OR
VALVES USED ON AUTOMATIC BURNERS OR STEAM HEAT-
ING SYSTEMS.
0
L91A
0
L91B
0
L91D
0
L91F
l
Models available for pressure systems up to 300 psi [2066
kPa].
l These controllers may be used with steam, air, noncombust-
ible gases, or other fluids noncorrosive to the brass or
phos-
bronze (300 psi models) bellows.
l
Wiper on the controller potentiometer moves in response to
pressure changes.
l
L91
D has 2 potentiometers for unison control of 2 motors.
l
L91F
has a fixed resistor and a manually-adjusted trim
potentiometer in series with the controller potentiometer; for
special applications in electronic bridge circuits.
l LSlB,D, and F models have an adjustable proportioning
(throttling) range to allow selection of desired pressure control
range.
l
Adjustments are made by screws on top of case.
l
Large, easily-read scaleplates are marked in both customary
(or/in.*, psi, or in. Hg) and metric
(kPa, MPa, or mm Hg) units.
l
Steel case has clear plastic cover so that pressure settings
and potentiometer action can be observed.
l
Fitting with
l/4-16
NPT threads provides rapid installation.
l
Controller can also be surface mounted by screws through
holes (knockouts) in back of case.
I
SPECIFICATIONS
1
TABLE I-MODELS AVAILABLE
L91 Fa
IO
to 300
ps.0
0 to 15 psi
5 to 150 psi
0.03 to 1.03
MPa
0.07
to
2.07
MPa
0 to 103
kPa
0.03 to 1.03 MPa
23176CF
9
9
Yes
Yes
Yes
30 to 110 psi
1.5 to 12 psi
13 to 52 psi
0.09 to 0.36
MPa
0.21 to 0.76 MPa
10 to 63
kPa
0.09 to 0.36
MPa
350 2413
25
172
225
1551
aScaleplates are marked in both customary
(ozlin?,
psi, or in. Hg) and Metric (kPa, MPa. or mm Hg) units.
bModels available with or without steam trap (siphon loop).
‘Includes steam trap (siphon loop).
dModel
available with
l/4
in. BSP-TR internal threads (British Standard Pipe Threads) for mounting.
eL91F
models have onefixed resistor and one manually-adjustable trim potentiometer in series with thecontroller potentiometer. Varidus combinations of resistance
values and locations of the fixed resistor and trim potentiometer are available. See Table II.
fLength of active winding is
7/64
in.
[2.8
mm] for Part No.
23176CB,
and
l/4
in.
[6.4
mm] for Part No. 23176CF.
gSee
Table II for potentiometer part number.
D.A.
Form Number 65-0059
12-66*
@Honeywell Inc. 1966