Graco Pressure Switches User Manual

FACTORY SEALED
3WIRE CABLE16AWG5FT. LG.

1/4 NPT

1/2" FEMALE

CONNECTOR

CONDUIT

CAUTION

LABEL

PRESSURE SWITCH

542-210-120

1.06 (27)
HEX

4.25

(108)

ADJUSTMENT

RED N.O.
BLACK N.C.
WHITE COM.

Pressure Switches

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.

SPECIFICATIONS

Ambient
Temperature Range

Max Media
Temperature

Electrical Rating &
Approvals

ORDERING INFORMATION

Max. Hydraulic

Pressure

2000
(138)

4700
(324)

4700
(324)

0º to 160ºF (-17º to 71ºC)

200ºF (93ºC)

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)

Adjustment

Range, Rising

50 to 2000

(3 to 138)

400 to 4700

(28 to 324)

400 to 4700

(28 to 324)

Factory
Setting

50
(3)

750
(52)

1150

(79)

Part No.

(Old Part No.)

557830

(542-210-200)

557828

(542-210-107)

557829

(542-210-120)

Moisture

Resistant,

Adjustable

Pressure

Switches

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

High-Low, Adjustable Pressure Switches

(Single and Dual)

DESCRIPTION

Three models for pressures up to 3,000 PSI (207 bars). UL listed
single-pole, double-throw snap action swit ching elements with
automatic reset by micro-switch snap-action. NEMA Type 3
weather-proof enclosures. Maximum electrical rating (continuous
in ductive) is 10 amperes / 125 or 250 volts AC or 0.5 amp / 3O
volts DC. Approximate weights are 2.5 lb. (1.1 kg.) for the single­central models and 3.0 lb. (1.4 kg.) for the dual-control models.
Switch wire leads for the single-control models are 3 #18 AWG
wires, each approx. 18” (45.7 cm) long; dual-control models have
6 #18 AWG wires each approx. 18” (45.7 cm) long.

OPERATION

When pressure exceeds the trip set ting, it forces the actuator
piston against the micro-switch button, activating the switch.
Switch remains closed/open until pressure is relieved and piston
returns to its original position. Reset is automatic.

ADJUSTMENT

Remove the adjusting screw cover(s). Turn self-locking adjustment
screw clockwise to reduce the pressure point or counter ­clockwise to increase it. (On the dual switch, there are two
screws–one for each line. Each screw must be set to the pressure
desired.) Replace and secure cover(s).

Terminal Switch Terminal Switch 1 Switch 2

Common Purple Common Purple Brown

Norm.

Closed

Norm.

Open

Blue

Red

Norm.

Closed

Norm.

Open

Blue Orange

Red Yellow

PERFORMANCE & ORDERING INFORMATION

SINGLE-SETTING MODELS RATINGS-PSI (BARS)

Proof

Pressure

7000
(483)

7000
(483)

DUAL-CONTROL MODELS RATINGS-PSI (BARS)

Proof

Pressure

3000
(207)

Adjustable Range

Decreasing
Min. Max.

125

1400

(9)

(97)

250

2775

(17)

(191)

Adjustable Range

Decreasing
Min. Max.

35

375

(2)

(26)

Increasing
Min. Max.

135

1500

(9)

(103)

280

3000

(19)

(207)

Increasing
Min. Max.

40
(3)

Actuation Valve

400
(28)

Differential *

10 to 60

(0.7 to 4)

30 to 225

(2 to 16)

Actuation Valve

Differential *

5 to 25

(0.3 to 2)

Part No.

(Old Part No)

(507-509-000)

(507-507-000)

To Order, Use

(540-367-000)

Disc.

Disc.

Part No.

558947

All written and visual data contained in this document are based on the latest product information available at the time of publication. Graco reserves the right to make changes at any time without notice.

Contact us today!

To receive product information or talk with a Graco representative,
call 800-533-9655 or visit us online at www.graco.com.

©2006-2009 Graco Inc. Form No. L15521 Rev. B 3/09 Printed in U.S.A. All other brand names or marks are used for identification purposes and are trademarks of their respective owners. All written and
visual data contained in this document are based on the latest product information available at the time of publication. Graco reserves the right to make changes at any time without notice.