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GCA Schaevitz™ Precision Gage Heads, Spring-Loaded Design

Gage Head Series GCA

The GCA Series heavy-duty gage heads enable high performance in environments containing moisture, dirt, and fluid contaminants. Gage heads are spring loaded LVDTs (Linear Variable Differential Transformers) with precision linear bearings.

These robust high-temperature gage heads allow measurements over long strokes up to ±2.0 inches [±50 mm]. The maximum spring force is typically less than 8 oz [227 grams]. A removable black-chromed, hardened tool steel tip is threaded (4-48UNF-2A) to the working end. Internal construction prevents the core and shaft from rotating as they move longitudinally. The integral electrical connector (welded) provides for easy installation and allows replacing a damaged cable without sacrificing the sensor. Installation and adjustment are facilitated by an external ½-20 mounting thread and the two locknuts supplied with each unit.

The ruggedness, long life cycle, and very high reliability of the GC Series provide the lowest cost of ownership over the life of the equipment onto which they are installed. The one-piece front end (barrel which contains the bearing assembly), machined from solid stainless steel bar, coupled with a bronze bushing, has far greater resistance to bending forces and side loads compared to other designs. This is particularly important on the longer stroke versions; it reduces the common risk of probe damage/bending during installation or maintenance of industrial equipment. The GC Series designs also require fewer parts and weld joints, thereby increasing overall structural integrity and reliability.

Features

  • All-welded construction
  • Resistant to harsh environments
  • Calibration certificate supplied with every unit

Specifications

Model GCA

Supply voltage:

3 Vrms (sinus wave)

Frequency range:

2.5 kHz as tested (4 Hz … 10 kHz)

Linearity:

±0.25 % full scale

Null voltage

≤0.5 % full scale output

Repeatability:

0.6 µm (25 µinches)

Operating temperature:

-55 … +150 °C

Shock survival:

1000 g for 11 ms (half-sine)

Vibration tolerance:

20 g up to 2 kHz

Housing material:

AISI 400 stainless steel

Electr. termination:

6-pin MS-type connector

NEMA IEC60529-Rating

IP68 to 70 bar with use of proper mating connector plug

Notes:
All values are nominal unless otherwise noted
FS: Full Scale is 2X for ±X stroke
FSO: Full Scale Output is the output at X position for ±X stroke

Model number Gaging range Sensitivity Output Impedance**) Phase shift
 

mV/V per

at stroke ends *)

Input (Pri)

Output (Sec)

 
 

inch

mm

0.001 inch

mm

mV/V

Ohm

Ohm

°

GCA-121-050

±0.050

±1.27

4.2

165.4

210

430

950

+6

GCA-121-125

±0.125

±3.17

2.4

94.4

300

1710

1820

+5

GCA-121-250

±0.250

±6.35

1.6

63.0

400

800

940

+5

GCA-121-500

±0.500

±12.7

1.1

43.3

550

900

1150

+2

GCA-121-1000

±1.000

±25.4

0.84

33.1

840

900

2100

+1

GCA-121-2000

±2.00

±50.8

0.34

13.4

680

525

535

-1

* Unit for output at stroke ends is millivolt per volt of excitation
** with 2.5 kHz supply

Mechanical Specifiations

Model number Pretravel Overtravel, min. Spring force Dimensions, approx. Weight
 

 

A

B

C

 

inch

mm

inch

mm

N

inch

mm

inch

mm

inch

mm

oz

g

GCA-121-050

0.26

6.6

0.15

3.8

1 … 1.6

1.91

48.5

4.33

110.0

3.28

83.31

2.2

62

GCA-121-125

0.35

8.9

0.15

3.8

1 … 1.6

2.75

69.9

5.14

130.6

4.12

104.6

2.9

82

GCA-121-250

0.15

3.8

0.15

3.8

1 … 1.6

3.61

91.7

6.02

152.9

4.98

126.5

3.2

91

GCA-121-500

0.18

4.6

0.90

22.9

1 … 2.2

5.30

134.6

10.76

273.3

8.29

210.6

5.0

142

GCA-121-1000

0.07

1.8

0.15

3.8

1 … 2.2

7.56

192.0

13.01

330.5

10.55

268.0

7.5

213

GCA-121-2000

0.10

2.5

0

0

1 … 2.2

10.89

276.6

20.94

531.9

16.37

415.8

13

369

Dimensions of Gage Head GCA

All dimensions in inches, values in brackets in mm, approx. values. These drawings are for information only and not intended for construction purpose. Please ask for detailed drawings.

Wiring Information

Wiring information GCA

Connect „B“ to „C“ for differential output