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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 )

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 )

- 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

I N D I C A T O R

1 KNURLED ADJUSTMENT KNOB ON

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

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

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

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.)

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.