5
CD-20 Sample Probe Controller
Section 1—Overview
The CD-20 Sample Probe Controller is engineered for use with the True-Cut C-Series sample probe. It
provides both pulse input (ow proportional) and repeat (time proportional) control of the sample probe.
When a “start” pulse is received, the probe is rotated to capture and discharge a 1.5-ml isokinetic sample.
When installed in a horizontal line, the probe is stopped in the closed position, while on a vertical line the
probe is stopped in the open position.
The C21 probe collects one 1.5 cc sample per 360-degree rotation.
The C22 probe collects two 1.5 cc samples per 360-degree rotation.
An explosion-proof housing encloses the complete assembly, and two ¾-in. NPT holes allow connection of
the line power and input pulse (for ow-proportional sampling). A ½-in. breather plug and a ½-in. conduit
plug are installed on opposite sides of the enclosure.
A coupling, jam nut, and hub allow the assembly to be mounted directly to the C-Series sample probe. No
brackets or supports are required; however, they are recommended for piping with signicant vibration.
The CD-20 controller (Figure 1.1) consists of the following:
• a motor control assembly (12VDC, 24VDC, 115VAC, or 230VAC)
• a DC gear motor with a gear ratio of 150:1
• a cam with two high points mounted on the gear motor output shaft
• a proximity switch
Figure 1.1—CD-20 controller components
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