Waterpilot FMX21 Installation
Endress+Hauser 17
5.2 Additional mounting instructions
• Cable length
– Customer-specific in meters or feet.
– Limited cable length when performing installation with freely suspended device with
cable mounting screw or mounting clamp, as well as for FM/CSA approval: max. m/ft.
300 m (984 ft).
• Sideways movement of the level probe can result in measuring errors. For this reason,
install the probe at a point free from flow and turbulence, or use a guide tube. The
internal diameter of the guide tube should be at least 1 mm (0.04 in) greater than the
external diameter of the selected FMX21.
• To avoid mechanical damage to the measuring cell, the device is equipped with a
protection cap.
• The cable must end in a dry room or a suitable terminal box. The terminal box from
Endress+Hauser provides optimum protection from the effects of humidity and weather
conditions and is suitable for outdoor installation→ 118.
• Cable length tolerance: < 5 m (16 ft): ±17.5 mm (0.69 in); > 5 m (16 ft): ±0.2 %
• If the cable is shortened, the filter at the pressure compensation tube must be
reattached. Endress+Hauser offers a cable shortening kit for this purpose
(documentation SD00552P/00/A6).
• Endress+Hauser recommends using twisted, shielded cable.
• In shipbuilding applications, measures are required to restrict the spread of fire along
cable looms.
• The length of the extension cable depends on the intended level zero point. The height
of the protection cap must be taken into consideration when designing the layout of the
measuring point. The level zero point (E) corresponds to the position of the process
isolating diaphragm. Level zero point = E; tip of probe = L (see the following diagram).
5.3 Dimensions
For dimensions, please refer to the Technical Information TI00431P/00/EN, "Mechanical
construction" section (see also: www.de.endress.com → Downloads → Media Type:
Documentation).
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