Siemens Powers SW 141 Series Manuel du propriétaire

PowersTM Controls

Technical Instructions

Document No. 155-052P25

SW 141-1

June 17, 2010

SW 141 Differential Static

Airflow Switches

141-0518

Siemens Industry, Inc.

Description The SW 141 Airflow Switch senses static differential pressure and the diaphragm operated

snap switches actuate electrical circuits. Auto reset and manual reset models are

available.

Application Auto reset switches (141-0518 and 141-0574) should be used for applications requiring

positive proof of airflow (or fan operation) or to detect high differential pressures

associated with dirty air filters or similar maintenance alarms not requiring safety lock-out

(shut down) of the fan.

The manual reset switch (141-0575) should be used for applications requiring safety lock

out (shut down) of the fan. The switch can be used on the fan discharge (positive

pressure), fan inlet (negative pressure), or across the fan (differential pressure) to detect

excessively high positive pressures or low negative pressures, and turn off the fan before

damage occurs to ducts or dampers.

Product Numbers Table 1.

Product

Number Setpoint Range

(Field Adjustable) Setpoint *

Accuracy Switching *

Differential Switching

Action

141-

0518 1” to 12” WC

(250 Pa to 3000 Pa) @ 12” ±1.5” WC

(3000 Pa ±375 Pa) Approx.

0.6” to 1.5” WC

(150 Pa to 375 Pa)

SPDT/

Auto Reset

141-

0575 1” to 12” WC

(250 Pa to 3000 Pa) @ 12” ±1.5” WC

(3000 Pa ±375 Pa) Not Applicable SPST/

Manual

Reset

141-

0574 0.05” to 1.0” WC

(12.5 Pa to 250 Pa) @ 1”±0.2“ WC

(250 Pa ±50 Pa) Approx.

0.06"to 0.6” WC

(15 Pa to 150 Pa)

SPDT/

Auto Reset

* Setpoint accuracy tolerance and switching differential decrease proportional to setpoint decrease.

Technical Instructions SW 141 Differential Static Airflow Switches

Document Number 155-052P25

June 17, 2010

Page 2 Siemens Industry, Inc.

Specifications

Operating

Measured media Air

Switch action

Auto reset See Table 1

Manual reset Switch is Normally Closed (N.C.) and

only opens on increasing pressure signal.

Switch must be manually reset by operator

Ambient temperature range −40°F to 180°F (−40°C to 82°C)

Maximum overpressure 0.5 psi (3.4 kPa)

Mounting position Diaphragm in any vertical plane

Physical Electrical ratings Non inductive - 15 amps @

120-277 Vac

Pilot Duty - 300 VA @ 120-277 Vac

Conduit opening One, conduit size 1/2-inch

Sample line connectors Two connectors, complete with nuts and

ferrules, which accept 1/4-inch OD (6.4 mm)

copper or poly tubing

Material Aluminized steel

Agency certification

U.L. MFHX File MH9888

CSA 1811M25

Weight 1 lb (0.45 kg)

Dimensions See Figure 9

Accessories High accuracy static pressure sensor 269-062

Static pressure sensing kit 189-142

Operation The diaphragm operates a spring lever to actuate the snap switch. The manual reset

switch keeps the electrical contact open until pushed to reset. Turning the adjustment

knob clockwise increases the setpoint.

Mount the unit with the diaphragm in any vertical plane. Connect the static pressure

line(s) as shown in Figure 1.

Installation

SW0097R1

Switch Nut & Integral

Ferrule Tubing

Figure 1. Connecting the Static Pressure Line.

SW 141 Differential Static Airflow Switches Technical Instructions

Document Number 155-052P25

June 17, 2010

Siemens Industry, Inc. Page 3

Installation,

Continued For use as a negative pressure switch:

Connect the static pressure line to the low inlet (marked on the case and Figure 2)

and leave the high inlet open to the atmosphere.

For use as a positive pressure switch:

Connect the static pressure line to the high inlet (marked on the case and Figure 2)

and leave the low inlet open to the atmosphere.

For use as a differential pressure switch:

Connect the highest static pressure line to the high inlet and the lowest static

pressure line to the low inlet (marked on the case and Figure 2.)

141-0518 141-0574 141-0575

Figure 2. Switches with Covers Removed.

Setpoint

Adjustment Each switch is factory set at the minimum setpoint. See Table 1.

1. To increase the setpoint, turn the adjustment screw clockwise as shown in Figure 2

and Figure 3. From the lowest setpoint, several turns are necessary to engage the

adjusting mechanism.

2. Adjust the setpoint until switching occurs at the required point.

3. Check the setpoint for accuracy with a magnahelic gauge.

SW0096R1

3.0 .05

6.0

12.0

9.0

The Red Band Is

The Setpoint

Location On The Scale

Figure 3. Adjusting the Setpoint.

Technical Instructions SW 141 Differential Static Airflow Switches

Document Number 155-052P25

June 17, 2010

Page 4 Siemens Industry, Inc.

Pressure Sensors Pressure sensor selection is based on the medium to be measured, the measurement

type (static or velocity), and the required range and accuracy.

Pressure sensors measure the difference between two sensing ports usually labeled high

and low. This provides a pressure measurement against a reference. Measuring the

pressure inside a pipe or duct and comparing it to the air outside (ambient) the pipe or

duct is an example of static pressure measurement. A sensor measuring the pressure

differential across a pump or chiller measures velocity pressure.

Figure 4. Pitot Tube (Part Number 269-062).

Wiring Diagrams Before setpoint pressure is applied to the diaphragm, the switch contact is in a normally

closed position as shown in Figures 5 and 6.

Figure 5. Manual Reset Switch 141-0575.

Figure 6. Auto Reset Switches 141-0518 and 141-0574.

SPDT terminals are marked Common (C), Normally Open (NO), and Normally

Closed (NC).

Figure 7. Auto Reset Switches to Prove Excessive Airflow or Pressure.

SW 141 Differential Static Airflow Switches Technical Instructions

Document Number 155-052P25

June 17, 2010

Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as

design improvements are introduced. Powers is a registered trademark of Siemens Industry, Inc. Other product or company names mentioned

Siemens Industry, Inc.

Building Technologies Division

1000 Deerfield Parkway

Buffalo Grove, IL 60089-4513

U.S.A.

Your feedback is important to us. If you have

comments about this document, please send them

to SBT_technical.editor.[email protected]

Wiring Diagrams,

Continued

Figure 8. Auto Reset Switches to Prove Insufficient Airflow or Pressure.

Dimensions

SW000098R1

Low

Pressure

Inlet

3.88

(98)

0.71

(18)

0.78

(20)

High

Pressure

Inlet

6.13

(156)

2.81

(71)

3.25

(82) 3.25

(82)

1.38

(35)

0.44

(11)

0.19

(5)

dia

hole

1.63

(41)

1.94 (49)

Figure 9. Dimensions in Inches (Millimeters).

Document No. 155-052P25

Printed in the U.S.A.

Page 5

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