Graco Pressure Switches L15521 15521 Accessories User's Manual

Graco Automatic Lubrication Systems User's Manual - Pressure Switches L15521 15521 Accessories.
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Moisture-resistant single control pressure 
switches

DESCRIPTION
Three factory set models are available for hydraulic pressures 
from 10 to 4700 psi.  All are single pole double throw type (NEMA 
4). Each comes complete with a sealed 3-wire cable that is five 
feet long.

OPERATION
When pressure exceeds the set point, the internal contacts 
transfer (N.O. closes and N.C. opens).  This can be used to send 
an alarm signal to alert either a high, or low pressure condition.  
When the abnormal condition is corrected, the contacts return to 
their normal state.

ADJUSTMENT
The adjustment procedure for the high-pressure switch is as 
follows: 

Disconnect and lock out all power from the assembly before 

attempting adjustment. Serious injury may result from 
electrical shock. 

To avoid possible system damage, change the blow out disc 

or relief valve setting to match the new pressure switch 
setting. 

Turn off electrical power to the lube system. 

a. 

Connect switch to pressure source.

b. 

With power disconnected, slide adjustment “cover” 

c. 

toward cable while twisting it to overcome friction.
Connect continuity tester (VOM or light) to leads.

d. 

Insert screwdriver into adjustment slot and turn 

e. 

clockwise to increase setting or counter-clockwise to 
decrease setting.  For setting on rise, apply desired 
pressure and turn adjustment (clockwise facing cable 
end of pressure switch) until switch clicks and/or 
tester confirms contact transfer (Circuit across N.O. 
and COM. terminals closes).  For setting on fall, apply 
pressure equal to normal system operating pressure.  
Reduce source pressure to set point value.  Turn 
adjustment counterclockwise until switch clicks and/
or tester confirms contact transfer (circuit across N.C. 
and COM. closes).
After completing adjustments, slide “cover” closed 

f. 

over adjustment compartment. Recheck set point.

WARNING

Moisture 

Resistant, 

Adjustable 

Pressure 

Switches

FACTORY SEALED

3 WIRE CABLE 16 AWG 5 FT. LG.

1/4 NPT

1/2" FEMALE

CONNECTOR

CONDUIT

CAUTION

LABEL

PRESSURE

SWITC

H

542-210-12

0

1.06 (27)

HEX

4.25

(108)

ADJUSTMENT

COVER

RED

N.O.

BLACK N.C.

WHITE COM.

ORDERING INfORMATION

Max. Hydraulic 

Pressure

Adjustment 

Range, Rising

factory 

Setting

Part No.

(Old Part No.)

2000  
(138)

50 to 2000 

(3 to 138)

50 
(3)

557830

(542-210-200)

4700 
(324)

400 to 4700 

(28 to 324)

750 
(52)

557828

(542-210-107)

4700 
(324)

400 to 4700 

(28 to 324)

1150 

(79)

557829

(542-210-120)

Pressure Switches

SPECIfICATIONS
Ambient 
Temperature Range

0º to 160ºF (-17º to 71ºC)

Max Media 
Temperature

200ºF (93ºC)

Electrical Rating & 
Approvals

Rated to 5A resistive and 5A inductive (75% 
power factor), at 125 VAC & 250 VAC, 1/4 HP; 
5A resistive and 3A inductive at 30 VDC; 0.5A 
resistive & 0.25A inductive at 125 VDC; 5mA at 
6 VDC, 2mA at 12 VDC & 1mA at 24 VDC

UL Recognized, CSA Certified

CE Compliance with low voltage directive (LDV)

CE Compliance to pressure equipment,              
Directive (Ped/97/23/EC)

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