Honeywell L91D Manual De Usuario
ADJUSTING SCREW
C O N T R O L L E R
P O T E N T I O M E T E R ( S )
P O T E N T I O M E T E R ( S )
SCALE
A D J U S T I N G
P O T E N T I O M E T E R
SCREW
P O T E N T I O M E T E R
WIPER ARM(S)
P R O P O R T I O N I N G
S C A L E P L A T E
O N L Y )
P R O P O R T I O N I N G
I N D I C A T O R
( L 9 1 B . D . F O N L Y )
( L 9 1 B . D . F O N L Y )
- B E L L O W S H O U S I N G
M A I N S C A L E
S E T T I N G
S E T T I N G
I N D I C A T O R
1 KNURLED ADJUSTMENT KNOB ON
TO
PSI
TO 2.07
M O D E L S .
E l 2 7 5
FIG.
SETTING AN
PROPORTIONING
CONTROLLER.
MODELS:
potentiometer; nonadjustable proportioning
range.
B-single potentiometer; adjustable proportioning range.
potentiometers allow unison control of 2 motors;
adjustable proportioning range.
F-single potentiometer; adjustable proportioning range;
fixed resistor and manually-adjustable trim potentiometer in
series with controller potentiometer.
ELECTRICAL RATING: 24
POTENTIOMETER ACTION: Wiper moves toward
POTENTIOMETER ACTION: Wiper moves toward
on pressure
rise; toward
on pressure fall. Potentiometer is field
replaceable.
POTENTIOMETER RESISTANCE: 140 ohms (nominal) for
and D models; see Table II for
F models.
PRESSURE SENSING ELEMENT: Phos-bronze bellows.
MAXIMUM AMBIENT TEMPERATURE: 150 F
MAXIMUM AMBIENT TEMPERATURE: 150 F
C].
MINIMUM AMBIENT TEMPERATURE: 32 F [0 C].
ADJUSTMENT MEANS: Screws on top of controller case; knurled
knob for main scale setting on 10 to 300 psi
to 2.07
models.
S E T P O I N T : A t l o w p r e s s u r e e n d o f p r o p o r t i o n i n g
(throttling) range.
WEIGHT: 116.15 oz.
kg].
FINISH: Gray.
MAIN SCALEPLATE: Marked in both customary
MAIN SCALEPLATE: Marked in both customary
psi, or in.
Hg) and Metric
or mm Hg) units.
PROPORTIONING RANGE
and F only):
graduated from A to F with a MIN (minimum) value below A. (See
Table Ill for the value of each division.)
Table Ill for the value of each division.)
MOUNTING MEANS: Fitting on bellows has
NPT threads
(external on 0 to 16
0 to 4 psi, and 0 to 15 psi models;
internal on all other models) for mounting on a pipe or steam trap
(siphon loop).
NOTE: Some models are available with
BSP-TR internal
threads: see Table
Also can be surface mounted by screws through 2 holes
(knockouts) in back of case.
TABLE
F RESISTANCE VALUES AVAILABLE
In Blega 11.2 23367F
4.8 470 518
R-B
In B
17.6 233676
4.8 870
ln w legb 380.0
6.4 2080 2515
for Oto 15 psi [Ot o 103 models only.
for Oto 15 psi IOto 103
and 5to 150 psi
to 1.03
models.
'Nominal resistancevalues.
adjustable trim potentiometer is
ohms (nominal)
in all
models. With zero pressure on the bellows, adjust the trim potentiometer to
obtain the resistance values listed between terminals and or between
terminals and W, as indicated.
TABLE III-APPROXIMATE VALUE OF EACH DIVISION
(A TO B TO C. etc.) ON PROPORTIONING (Throttling)
RANGE SCALEPLATE
only)
OPERATING
RANGE
VALUE OF EACH
DIVISION
CUSTOMARY UNITS METRIC UNITS CUSTOMARY UNITS METRIC UNITS
2 to 50 psi 14 to 345
4.7 psi 32.4
5 to
psi
to 1.03
7.8 psi
0.054
5to
1.03
6.7 psi
0.046
10 to 300 psi 0.07 to 2.07
16.4 psi 0.113
with
in.
10 to 300 psi 0.07 to 2.07
13.8 psi 0.095
with
in. pot.)
PRINTED IN U.S.A.