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POWERS® Controls

Technical Instructions

Document No. 155-025

GA 142-4

April 26, 2019

GA 142 AP Analog Pressure

Gauges

Siemens Industry, Inc.

Description

The GA 142 Analog Pressure Gauge is a round dial instrument displaying the value of

input pressure over an angular displacement of 270°.

Specifications

Accuracy 2-1/2% of full scale for middle half of

the scale, 3-1/2% elsewhere

Connection 1/8-inch NPT male or barbed

connector for 1/4-inch OD tubing.

See Table 2

Shipping weight

1-1/2 inches 0.5 lb (0.23 kg)

2-1/2 inches 1 lb (0.45 kg)

Operation

As the input pressure increases, the curved bourdon tube tends to straighten out. This

action moves the gear and linkage, which is attached to the end of the bourdon tube,

making the pointer rotate clockwise.

Calibration and

Adjustments

Use a master gauge to check the pressure reading. If the gauge does not indicate this

measurement, adjust the gauge pointer.

Table 1. Product Numbers.

Range

Product Number

1-1/2-in

2-1/2-in

Panel-mount

Pipe-mount

Panel-mount

Pipe-mount

0 to 30 psi

142-0274 (barb)

—

142-0277 (barb)

142-0311 (back)

0 to 30 psi

0 to 200 kPa

—

142-0373* (back)

142-0426* (bottom)

—

0 to 30 psi

0 tp 200 Kpa

RoHS Certified

—

142-0473* (back)

142-0476* (bottom)

—

0 to 100 psi

—

142-0312 (back)

0 to 160 psi

—

142-0313 (back)

* Dual Scale Gauges. Pipe-mount fitting threads are Teflon taped. No logo.

Summary of content (3 pages)

PAGE 1
Technical Instructions Document No. 155-025 GA 142-4 April 26, 2019 POWERS® Controls GA 142 AP Analog Pressure Gauges Description The GA 142 Analog Pressure Gauge is a round dial instrument displaying the value of input pressure over an angular displacement of 270°. Specifications Accuracy 2-1/2% of full scale for middle half of the scale, 3-1/2% elsewhere 1/8-inch NPT male or barbed connector for 1/4-inch OD tubing. See Table 2 Connection Shipping weight 1-1/2 inches 2-1/2 inches 0.5 lb (0.
PAGE 2
Technical Instructions Document Number 155-025 April 26, 2019 GA 142 AP Analog Pressure Gauges Table 2. Hole Sizes for Panel-mounted Gauges. Gauge Size Inches (mm) Hole Size Inches (mm) Cutout used in Standard Panel Template* 1-1/2 (38) 1-11/16 (42) G-1 2-1/2 (64) 2-21/32 (68) G-3 * See 155-223P25 (TB 196) for further information. Figure 2. Dimensions for Table 3. Figure 1. Dimensions for 142-0426. Table 3. Dimensions in Inches (mm). See Figure 2.
PAGE 3
GA 142 AP Analog Pressure Gauges Technical Instructions Document Number 155-025 April 26, 2019 Table 4. Dimensions in Inches (mm) for Gauge 142-0473. Dial Size Inches (mm) 1.5 (38) A B F1 NPT C Back Back 1.64 (42) 1.01 (26) 1.60 (41) W Weight Oz (kg) Back Back 0.44 (11) 1.55 oz (0.044 kg) K 1/8 0.62 (16) NOTE: Teflon tape to be applied around the circumference of the brass socket pipe thread leaving only the first one-half to two threads free of tape. Table 5.