Chapter 4 - Transmitters; Specifications; Cd42-T0 (Figure 69); The Cd42-T1A (Figure 70) - CDI CD42 Instruction Manual

Chapter 4 - Transmitters

All CDI transmitters emit a magnetic field that passes through the pipeline and any surrounding soil or
water and is received by our CD42-GP. This signal is then passed along to the CD42-R receiver where
it is amplified and displayed. A variety of different transmitters are manufactured to fit differing line
sizes and applications from 2" and up. Older transmitter units emit a pulsing pattern that is fixed
(CD42-T1, CD42-T2, etc.), while newer transmitters are programmable and emit either the standard
fixed pattern by default, or by flipping a switch can emit either a distinctive pattern or a pattern that the
user creates (CD42-T1, CD42-T2, etc.). For typical pigging jobs involving a single transmitter there is
no real difference between the two types of transmitters, however, for jobs involving multiple pigs in a
train, using differing transmitter patterns allows one to distinguish one pig from another.
In addition to variable pulse patterns, the newer programmable transmitters have an optional delay of
anywhere from 10 minutes to several months before they begin pulsing. This feature is useful for when
the pig is loaded into the launcher but may not actually be launched for some days.

Specifications

CD42-T0
(Figure 69)
Typical transmission range through pipe of 15 feet and through air of
approximately 40 feet
Recommended for use in pipelines 4" to 6" in diameter
Guaranteed minimum 168 hour battery life (1 week)
Pressure rated to 2,000 PSI [approximately 130 bar]
Cylindrical dimensions of 7.1" X 1.66" [181mm X 42mm]
Powered by 6 N-Cell alkaline batteries
The CD42-T1A
Typical transmission range through pipe of approximately 25 feet
Recommended for use in pipelines 8" to 28" in diameter
Guaranteed minimum 500 hour battery life (21 days)
Pressure rated to 1,500 PSI [103.4 bar]
Cylindrical dimensions of 9.9" X 1.9" [251mm X 48mm]
Powered by 6 AA-Cell alkaline batteries
CD42-T1
(Figure 71)
Typical transmission range through pipe of approximately 25 feet and
through air of approximately 50 feet
Recommended for use in pipelines 8" to 28" in diameter
Guaranteed minimum 500 hour battery life (21 days)
Pressure rated to 2,500 PSI [170 bar]
Cylindrical dimensions of 10.7" X 3" [272mm X 76mm]
Powered by 6 AA-Cell alkaline batteries
CD42 Pipeline Pig Location & Tracking System
(Figure 70)
Page 46
Figure 69 CD42-T0
Figure 70 CD42-T1A
Figure 71 CD42-T1