Float Swiches MTS - GALVATEK - #1

8

Liquid levels in process and storage tanks need to be measured and monitored, since unwanted variations in these levels {due to evaporation or removal of the liquids) must be corrected. In this respect, a distinction must be made between two general tasks:

• controlling of the level in order to permit automatic execution of process operations (such as dosing of liquids)

• monitoring of the level in order to prevent possible damage (dry-running, heating without sufficient liquid) to the devices (pumps, heaters) installed in the tanks or to prevent an overflow

of the process liquid from the tanks.

Float switches offer a simple and economical solution for the controlling and monitoring of liquid levels in tanks. A float switch can even be used without connecting an additional elec­tronic controller!

The function of a float switch is based on the moving float and can be gua­ranteed only in liquids which do not form encrustation. Dirt in the tank (such as coarse metal chips) can also block the movement of the float. In such cases, where a float switch cannot be used, we recommend the use of our level rod-probes, providing the liquid is electrically conductive.

I. -M

Float switch with one contact

and integrated temperature sensor, version

LC

On the BK version, the height is ad­justed with the aid of a threaded nipple fitted in the terminal casing. This version can be mounted on the edge of a tank with the support HB or on a crossbeam with the aid of the mounting sleeve EM or the holding sleeve HM.

On float switches without a terminal casing and with a permanently connected cable 1.6m long (other cable lengths to order), the cable enters the tube of the float switch via a cable gland.

Float switch with one contact, version PG

The float switches are available in various versions:

• with one switch contact (with or without an integrated temperature sensor),

• with two switch contacts,

• with three switch contacts.

All switch contacts are changeover contacts.

A magnet inside the moving float actuates a reed contact mounted in a fixed position within the tube of the float switch.

In order to ensure optimal chemical and thermal resistance, the float switches are made of polypropylene

(PP) or polyvinylidenefluoride (PVDF). They are available without a terminal casing (version PG) and a permanently connected cable (length of 1,6m), with the small terminal casing LC (material PP) or LC/L (material PVDF) and with the large terminal casing BK (material PP) or BK/L (material PVDF). The versions with terminal casings permit easy connection of the cables.

On the PG and LC versions, the bra­ckets on the tube of the float switch permit adjustment to any desired height and simple mounting of the float switches on the edges of tanks.