Criterion 6.5.18 Control Sensor Installation

Criterion text:
Control sensors and the means for transmitting sensor outputs to control devices shall be protected from environmental influence such as wind, moisture, temperature or other factors which may alter their intended sensing function.

Comments:
This criteria deals primarily with the installation of the sensor and sensor wiring. Sensor must be protected from environmental factors (rain, moisture, etc.) that can alter the function of the sensor.

This standard is very similar to 6.1.5.5 Control Lines and Sensors. Installers must take special care to ensure that this standard is met during the installation phase.

Installers must use the manufacturer's provided control equipment and materials and follow instructions contained in the SRCC approved installation manual. Acceptable industry standards must also be followed.

The sensor must also be installed at the proper location, in most cases on the collector return piping directly adjacent to the collector. See Figure 4.

Control sensors and wiring provided by the system manufacturer must be used. SRCC has reviewed and approved the manufacturer's components and ancillary materials. Figures 1 and 2 illustrate a sensor packet provided by the manufacturer. It includes sensors, sensor wiring, connectors, clamps, and thermal paste. A well organized packet provides the installer with all the materials needed for the control sensor and wiring installation.

Figure 1

Figure 2

Proper mounting of the sensor and connection to the transmission wiring is vital for proper system operation. (See Figure 3)

Figure 3

In Figure 4, note that the sensor is securely attached to the collector return outlet piping.

Figure 4

Although in Figure 5, the sensor is protected from environmental influences by being under the pipe insulation, the connector itself is not.

Figure 5

The integrity of other components must not be compromised during the installation process. As evident in Figure 6, the sensor installation should have been installed with a bit more care. This installation not only negates the use of the collector's sealing gasket, but also leaves much to be desired in regard to a solid connection of the sensor to the piping.

Figure 6

The sensor installation in Figure 7 (as well as the insulation (plastic), insulation protection, and flashing) is incorrect. The sensor should have been installed where indicated.

Figure 7

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