SPECIFICATIONS
4-20mA loop, two wire operation
Hermetically sealed housing
25 µ-inch [0.6 µm] repeatability
IEC IP68 rating to 1,000 PSI [70 bars]
Stroke ranges from 0.250 up to 2 inches
Reverse polarity protection
Hardened tool steel contact tip
High side load resistance
The GCT Series heavy-duty gage heads enable high performance in
environments containing moisture, dirt, and fluid contaminants. With a
spring loaded LVDT, a precision linear bearing, and internal signal
conditioning electronics o
perating on a 4 to 20mA loop, the GCT is
ideal for difficult industrial environments and remote locations where
sensor power is not readily available and long cable runs are
expected. The 4-20mA signal is less susceptible to EMI and RFI
interference than low amplitude AC or DC signals.
These robust gage heads allow measurements over stroke ranges
from 0 to 0.250 inch [6.35mm] up to 0 to 2 inches [50.8mm]. The spring
force is typically 9oz [255 grams] at fully compressed electrical stroke.
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.
Like in most of our LVDTs, the GCT windings are vacuum
impregnated with a specially formulated, high temperature, flexible
resin, and the coil assembly is potted inside its housing with a two-
component epoxy. This provides excellent protection against hostile
environments such as high vibration and shock.
The ruggedness, long life cycle, and very high reliability of the GCT
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 GCT Series designs also
require fewer parts and weld joints, thereby increasing overall
structural integrity and reliability.