Installation Waterpilot FMX21
16 Endress+Hauser
7 Waterpilot FMX21
8 Additional weight can be ordered as an accessory for the FMX21 with external diameter of
22 mm (0.87 in) and 29 mm (1.14 in)
9 Protection cap
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.
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 humidity and climatic protection and is suitable for installation outdoors
(see the Operating Instructions for additional information).
• 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 (see the Operating
Instructions for additional information) (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).
A0026013
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