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PRODUCTOIN INFORMATION PI 010


GUARD 201 & GUARD 202 LEVEL CONTROLLERS
FOR CONDUCTING LIQUIDS

PRINTRONIX Liquid Level Controllers of types GUARD 201 and GUARD 202 are designed to control the pump motors or solenoid valves with respect to the liquid levels in containers, sumps and overhead tanks. A wide field of applications includes,

Protection of submersible pumps used in tube wells.

Liquid Level Control for tanks and containers in dairies, breweries, chemical industries etc.

Switching of pumping sets for domestic and industrial water supply.
 

FEATURES:

  • Safe operation over a wide range of temperature, pressure and concentration of liquid.

  • No moving parts in the detection probes guarantee reliable operation.

  • Detection completely unaffected by the shape, form and capacity of container.

  • No electrolysis occurs in the liquid because of low alternating detection,
    current ensuring longer probe life.

  • Simple and robust design facilitates easy mounting even in already existing installation.

PRINCIPLE OF OPERATION

The controllers work in conjunction with suitable probes which detect the electrical conductivity of the liquid.The detection of the conductivity actuates a relay.  The relay contacts may be used to control pump motor or to activate any alarm etc.
 

SINGLE POINT LEVEL CONTROL

GUARD 201 is useful in the installations where the START/STOP signal is to be generated corresponding to one level 0nly. It may be used to protect submersible pumps, in which case it is necessary that the water level should not fall below the maximum draw down limit. It can also be used to protect a house hold or an industrial pumping set from the problems of dry running.
 

TWO POINT LEVEL CONTROL

GUARD 202 is suitable for the installations where separate START/STOP signals are to be generated for maintaining the liquid level within two extreme limits. It is very much useful for slurry and sewage control installations, besides applications in various chemical and other industries.
 

CONSTRUCTION

Both the instruments have construction Suitable for rear panel mounting. The conductivity detecting circuit is completely encapsulated in epoxy resin and is therefore unaffected by moisture or dust. For additional protection of a single or a set of instruments, damp, dust and vermin proof sheet steel housing can be supplied.
 

THE PROBES

For selection of suitable probes the dimensions of the container and the environmental conditions, viz., temperature pressure and chemical composition etc., must be considered. Please refer to our Product Information PI 009 for selecting suitable probes. Before ordering, all the possible details about the physical and chemical characteristics of the liquid in use must be furnished carefully.

 

SPECIFICATIONS

  • POWER SUPPLY                                         :   230V + 15%, 50 Hz.

  • POWER CONSUMPTION                              :   2 VA Approx.

  • OUTPUT                                                      :   One pair of changeover NO/NC Contacts, 5A, 250V A.C.

  • CURRENT IN THE PROBE CIRCUIT               :   4 Ma Max.

  • VOLTAGE ACCORSS PROBE & EARTH     :   15 V A.C. Max.

  • CONDUCTION DETECTION RANGE             :   Up to Max of  30 k Ohms in the Probe Circuit

  • AMB. TEMP.RANGE                                    :   0-50

  • WEIGHT                                                       :   500 gm Approx.

  • DIMENSIONS                                                :   96mm x 96mm X 55mm

  • PROBES                                                      :   Please refer our Product Information No. PI 009